PATENT DOCUMENT

Publication Number: US-10073590-B2
Application Number: US-201514839914-A
Country: US
Kind Code: B2

Title: Reduced size user interface

Abstract:
A method includes, at an electronic device: receiving data representing a sequence of images stored on an external device; displaying, on a touch-sensitive display, a representation of the sequence of images; determining whether a contact detected on the touch-sensitive display at the representation of the sequence of images has a characteristic intensity above a threshold intensity; in response to a determination that the characteristic intensity is above the threshold intensity, displaying a user interface menu including a user interface object representing an option to display a background of a user interface based on the sequence of images; detecting a selection of the user interface object; detecting a motion indicative of a wrist raise gesture; and in response to detecting the motion indicative of a wrist raise gesture, displaying the background of the user interface on the display of the electronic device based on the sequence of images.

Claims:
What is claimed is: 
     
       1. A non-transitory computer-readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by one or more processors of an electronic device with a touch-sensitive display, a rotatable input mechanism, and a motion sensor configured to sense motion indicative of a wrist raise gesture, cause the electronic device to:
 receive, via wireless communication, data representing a sequence of images stored on an external device; 
 display, on the touch-sensitive display, a representation of the sequence of images; 
 detect a contact on the touch-sensitive display at a location of the representation of the sequence of images; 
 determine whether the contact has a characteristic intensity above a threshold intensity; 
 in response to a determination that the characteristic intensity is above the threshold intensity, display a user interface menu including a user interface object,
 wherein the user interface object represents an option to display a background of a user interface on the display of the electronic device based on the sequence of images; 
 
 detect a selection of the user interface object; 
 detect, with the motion sensor, a motion indicative of a wrist raise gesture; and 
 in response to detecting the motion indicative of a wrist raise gesture, display the background of the user interface on the display of the electronic device based on the sequence of images, wherein displaying the background based on the sequence of images includes:
 display, in sequence, a first set of two or more images from the sequence of images; and 
 after displaying, in sequence, the first set of two or more images from the sequence of images, maintain display of an image from the sequence of images. 
 
 
     
     
       2. The non-transitory computer-readable storage medium of  claim 1 ,
 wherein the sequence of images includes a first image, a last image, and a representative image, and 
 wherein displaying the background based on the sequence of images includes:
 displaying, in sequence, the first set of one or more images from the sequence of images that are positioned before the representative image and the representative image. 
 
 
     
     
       3. The non-transitory computer-readable storage medium of  claim 2 , wherein the one or more programs further comprises instructions, which when executed by the one or more processors of the electronic device, cause the electronic device to:
 after displaying the first set of images, detect a user input; and 
 in response to detecting the user input, display, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image including the last image. 
 
     
     
       4. The non-transitory computer-readable storage medium of  claim 2 , wherein the one or more programs further comprises instructions, which when executed by the one or more processors of the electronic device, cause the electronic device to:
 after displaying the first set of images, detect a user input including a first portion and a second portion after the first portion; 
 in response to the first portion of the user input, display, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image; and 
 in response to the second portion of the user input, display, in sequence, a third set of one or more images from the sequence of images that are positioned after the representative image and display the last image, 
 wherein the one or more images of the second set of images are positioned before the one or more images of the third set of images. 
 
     
     
       5. The non-transitory computer-readable storage medium of  claim 2 , wherein the one or more programs further comprises instructions, which when executed by the one or more processors of the electronic device, cause the electronic device to:
 after displaying the first set of images, detect a rotation of the rotatable input mechanism; 
 in response to the rotation of the rotatable input mechanism, replace the display of the representative image with a second image from the sequence of images; 
 detect a second user input representing a selection of the second image as the representative image; 
 after detecting the second user input representing a selection of the second image as the representative image, detect, with the motion sensor, a second motion indicative of a wrist raise gesture; and 
 in response to detecting the second motion indicative of a wrist raise gesture, display the background of the user interface on the display of the electronic device based on the sequence of images with the second image as the representative image. 
 
     
     
       6. The non-transitory computer-readable storage medium of  claim 1 ,
 wherein the sequence of images includes a first image, a last image, and a representative image, and 
 wherein displaying the background based on the sequence of images includes:
 displaying, in sequence, the representative image and the first set of one or more images from the sequence of images that are positioned after the representative image including the last image. 
 
 
     
     
       7. The non-transitory computer-readable storage medium of  claim 6 , wherein the one or more programs further comprises instructions, which when executed by the one or more processors of the electronic device, cause the electronic device to:
 after displaying the first set of images, detect a user input; and 
 in response to detecting the user input, display, in sequence, a second set of one or more images from the sequence of images that are positioned before the representative image and the representative image. 
 
     
     
       8. The non-transitory computer-readable storage medium of  claim 6 , wherein the one or more programs further comprises instructions, which when executed by the one or more processors of the electronic device, cause the electronic device to:
 after displaying the first set of images, detect a user input including a first portion and a second portion after the first portion; 
 in response to the first portion of the user input, display, in sequence, a second set of one or more images from the sequence of images that are positioned before the representative image; and 
 in response to the second portion of the user input, display, in sequence, a third set of one or more images from the sequence of images that are positioned before or include the representative image, 
 wherein the one or more images of the second set are positioned before the one or more images of the third set, the second set includes the first image, and the third set includes the representative image. 
 
     
     
       9. The non-transitory computer-readable storage medium of  claim 6 , wherein the one or more programs further comprises instructions, which when executed by the one or more processors of the electronic device, cause the electronic device to:
 after displaying the first set of images, detect a rotation of the rotatable input mechanism; 
 in response to the rotation of the rotatable input mechanism, replace the display of the last image with a second image from the sequence of images; 
 detect a second user input representing a selection of the second image as the representative image; 
 after detecting the second user input representing a selection of the second image as the representative image, detect, with the motion sensor, a second motion indicative of a wrist raise gesture; and 
 in response to detecting the second motion indicative of a wrist raise gesture, display the background of the user interface on the display of the electronic device based on the sequence of images with the second image as the representative image. 
 
     
     
       10. The non-transitory computer-readable storage medium of  claim 1 ,
 wherein the sequence of images includes a first image, a last image, and a representative image, and 
 wherein displaying the background based on the sequence of images includes:
 displaying, in sequence, the first set of images from the sequence of images including the representative image, one or more images positioned after the representative image, one or more images positioned before the representative image, and the representative image. 
 
 
     
     
       11. The non-transitory computer-readable storage medium of  claim 10 , wherein the one or more programs further comprises instructions, which when executed by the one or more processors of the electronic device, cause the electronic device to:
 after displaying the first set of images, detect a user input; and 
 in response to detecting the user input, display, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image including the last image. 
 
     
     
       12. The non-transitory computer-readable storage medium of  claim 10 , wherein the one or more programs further comprises instructions, which when executed by the one or more processors of the electronic device, cause the electronic device to:
 after displaying the first set of images, detect a user input including a first portion and a second portion after the first portion; 
 in response to the first portion of the user input, display, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image; and 
 in response to the second portion of the user input, display, in sequence, a third set of one or more images from the sequence of images that are positioned after the representative image and display the last image, 
 wherein the one or more images of the second set of images is before the one or more images of the third set of images. 
 
     
     
       13. The non-transitory computer-readable storage medium of  claim 10 , wherein the one or more programs further comprises instructions, which when executed by the one or more processors of the electronic device, cause the electronic device to:
 after displaying the first set of images, detect a rotation of the rotatable input mechanism; 
 in response to the rotation of the rotatable input mechanism, replace the display of the representative image with a second image from the sequence of images; 
 detect a second user input representing a selection of the second image as the representative image; 
 after detecting the second user input representing a selection of the second image as the representative image, detect, with the motion sensor, a second motion indicative of a wrist raise gesture; and 
 in response to detecting the second motion indicative of a wrist raise gesture, display the background of the user interface on the display of the electronic device based on the sequence of images with the second image as the representative image. 
 
     
     
       14. The non-transitory computer-readable storage medium of  claim 1 , wherein the user interface comprises:
 the background; 
 a first user interface object indicating a time of day; and 
 a second user interface object indicating a date. 
 
     
     
       15. The non-transitory computer-readable storage medium of  claim 14 , wherein the appearance of the second user interface object is blended with the background. 
     
     
       16. The non-transitory computer-readable storage medium of  claim 1 , wherein the one or more programs further comprises instructions, which when executed by the one or more processors of the electronic device, cause the electronic device to:
 while maintaining display of the image from the sequence of images, detect a user input; and 
 in response to detecting the user input, display, in sequence, a second set of one or more images from the sequence of images, different than the first set of one or more images. 
 
     
     
       17. A method, comprising:
 at an electronic device with a touch-sensitive display, a rotatable input mechanism, and a motion sensor configured to sense motion indicative of a wrist raise gesture, wherein the touch-sensitive display comprises one or more sensors to detect the intensity of contacts with the touch-sensitive display: 
 receiving, via wireless communication, data representing a sequence of images stored on an external device; 
 displaying, on the touch-sensitive display, a representation of the sequence of images; 
 detecting a contact on the touch-sensitive display at a location of the representation of the sequence of images; 
 determining whether the contact has a characteristic intensity above a threshold intensity; 
 in response to a determination that the characteristic intensity is above the threshold intensity, displaying a user interface menu including a user interface object,
 wherein the user interface object represents an option to display a background of a user interface on the display of the electronic device based on the sequence of images; 
 
 detecting a selection of the user interface object; 
 detecting, with the motion sensor, a motion indicative of a wrist raise gesture; and 
 in response to detecting the motion indicative of a wrist raise gesture, displaying the background of the user interface on the display of the electronic device based on the sequence of images, wherein displaying the background based on the sequence of images includes:
 displaying, in sequence, a first set of two or more images from the sequence of images; and 
 after displaying, in sequence, the first set of two or more images from the sequence of images, maintaining display of an image from the sequence of images. 
 
 
     
     
       18. The method of  claim 17 ,
 wherein the sequence of images includes a first image, a last image, and a representative image, and 
 wherein displaying the background based on the sequence of images includes:
 displaying, in sequence, the first set of one or more images from the sequence of images that are positioned before the representative image and the representative image. 
 
 
     
     
       19. The method of  claim 18 , further comprising:
 after displaying the first set of images, detecting a user input; and 
 in response to detecting the user input, displaying, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image including the last image. 
 
     
     
       20. The method of  claim 18 , further comprising:
 after displaying the first set of images, detecting a user input including a first portion and a second portion after the first portion; 
 in response to the first portion of the user input, displaying, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image; and 
 in response to the second portion of the user input, displaying, in sequence, a third set of one or more images from the sequence of images that are positioned after the representative image and displaying the last image, 
 wherein the one or more images of the second set of images are positioned before the one or more images of the third set of images. 
 
     
     
       21. The method of  claim 18 , further comprising:
 after displaying the first set of images, detecting a rotation of the rotatable input mechanism; 
 in response to the rotation of the rotatable input mechanism, replacing the display of the representative image with a second image from the sequence of images; 
 detecting a second user input representing a selection of the second image as the representative image; 
 after detecting the second user input representing a selection of the second image as the representative image, detecting, with the motion sensor, a second motion indicative of a wrist raise gesture; and 
 in response to detecting the second motion indicative of a wrist raise gesture, displaying the background of the user interface on the display of the electronic device based on the sequence of images with the second image as the representative image. 
 
     
     
       22. The method of  claim 17 ,
 wherein the sequence of images includes a first image, a last image, and a representative image, and 
 wherein displaying the background based on the sequence of images includes:
 displaying, in sequence, the representative image and the first set of one or more images from the sequence of images that are positioned after the representative image including the last image. 
 
 
     
     
       23. The method of  claim 22 , further comprising:
 after displaying the first set of images, detecting a user input; and 
 in response to detecting the user input, displaying, in sequence, a second set of one or more images from the sequence of images that are positioned before the representative image and the representative image. 
 
     
     
       24. The method of  claim 22 , further comprising:
 after displaying the first set of images, detecting a user input including a first portion and a second portion after the first portion; 
 in response to the first portion of the user input, displaying, in sequence, a second set of one or more images from the sequence of images that are positioned before the representative image; and 
 in response to the second portion of the user input, displaying, in sequence, a third set of one or more images from the sequence of images that are positioned before or include the representative image, 
 wherein the one or more images of the second set are positioned before the one or more images of third set, the second set includes the first image, and the third set includes the representative image. 
 
     
     
       25. The method of  claim 22 , further comprising:
 after displaying the first set of images, detecting a rotation of the rotatable input mechanism; 
 in response to the rotation of the rotatable input mechanism, replacing the display of the last image with a second image from the sequence of images; 
 detecting a second user input representing a selection of the second image as the representative image; 
 after detecting the second user input representing a selection of the second image as the representative image, detecting, with the motion sensor, a second motion indicative of a wrist raise gesture; and 
 in response to detecting the second motion indicative of a wrist raise gesture, displaying the background of the user interface on the display of the electronic device based on the sequence of images with the second image as the representative image. 
 
     
     
       26. The method of  claim 17 ,
 wherein the sequence of images includes a first image, a last image, and a representative image, and 
 wherein displaying the background based on the sequence of images includes:
 displaying, in sequence, the first set of images from the sequence of images including the representative image, one or more images positioned after the representative image, one or more images positioned before the representative image, and the representative image. 
 
 
     
     
       27. The method of  claim 26 , further comprising:
 after displaying the first set of images, detecting a user input; and 
 in response to detecting the user input, displaying, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image including the last image. 
 
     
     
       28. The method of  claim 26 , further comprising:
 after displaying the first set of images, detecting a user input including a first portion and a second portion after the first portion; 
 in response to the first portion of the user input, displaying, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image; and 
 in response to the second portion of the user input, displaying, in sequence, a third set of one or more images from the sequence of images that are positioned after the representative image and displaying the last image, 
 wherein the one or more images of the second set of images is before the one or more images of the third set of images. 
 
     
     
       29. The method of  claim 26 , further comprising:
 after displaying the first set of images, detecting a rotation of the rotatable input mechanism; 
 in response to the rotation of the rotatable input mechanism, replacing the display of the representative image with a second image from the sequence of images; 
 detecting a second user input representing a selection of the second image as the representative image; 
 after detecting the second user input representing a selection of the second image as the representative image, detecting, with the motion sensor, a second motion indicative of a wrist raise gesture; and 
 in response to detecting the second motion indicative of a wrist raise gesture, displaying the background of the user interface on the display of the electronic device based on the sequence of images with the second image as the representative image. 
 
     
     
       30. The method of  claim 17 , wherein the user interface comprises:
 the background; 
 a first user interface object indicating a time of day; and 
 a second user interface object indicating a date. 
 
     
     
       31. The method of  claim 30 , wherein the appearance of the second user interface object is blended with the background. 
     
     
       32. The method of  claim 17 , further comprising:
 while maintaining display of the image from the sequence of images, detecting a user input; and 
 in response to detecting the user input, displaying, in sequence, a second set of one or more images from the sequence of images, different than the first set of one or more images. 
 
     
     
       33. An electronic device comprising:
 a touch-sensitive display; 
 a rotatable input mechanism; 
 a motion sensor configured to sense motion indicative of a wrist raise gesture; 
 one or more processors; 
 a memory; and 
 one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for:
 receiving, via wireless communication, data representing a sequence of images stored on an external device; 
 displaying, on the touch-sensitive display, a representation of the sequence of images; 
 detecting a contact on the touch-sensitive display at a location of the representation of the sequence of images; 
 determining whether the contact has a characteristic intensity above a threshold intensity; 
 in response to a determination that the characteristic intensity is above the threshold intensity, displaying a user interface menu including a user interface object,
 wherein the user interface object represents an option to display a background of a user interface on the display of the electronic device based on the sequence of images; 
 
 detecting a selection of the user interface object; 
 detecting, with the motion sensor, a motion indicative of a wrist raise gesture; and 
 in response to detecting the motion indicative of a wrist raise gesture, displaying the background of the user interface on the display of the electronic device based on the sequence of images, wherein displaying the background based on the sequence of images includes:
 display, in sequence, a first set of two or more images from the sequence of images; and 
 after displaying, in sequence, the first set of two or more images from the sequence of images, maintain display of an image from the sequence of images. 
 
 
 
     
     
       34. The electronic device of  claim 33 ,
 wherein the sequence of images includes a first image, a last image, and a representative image, and 
 wherein displaying the background based on the sequence of images includes:
 displaying, in sequence, the first set of one or more images from the sequence of images that are positioned before the representative image and the representative image. 
 
 
     
     
       35. The electronic device of  claim 34 , the one or more programs further including instructions for:
 after displaying the first set of images, detecting a user input; and 
 in response to detecting the user input, displaying, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image including the last image. 
 
     
     
       36. The electronic device of  claim 34 , the one or more programs further including instructions for:
 after displaying the first set of images, detecting a user input including a first portion and a second portion after the first portion; 
 in response to the first portion of the user input, displaying, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image; and 
 in response to the second portion of the user input, displaying, in sequence, a third set of one or more images from the sequence of images that are positioned after the representative image and displaying the last image, 
 wherein the one or more images of the second set of images are positioned before the one or more images of the third set of images. 
 
     
     
       37. The electronic device of  claim 34 , the one or more programs further including instructions for:
 after displaying the first set of images, detecting a rotation of the rotatable input mechanism; 
 in response to the rotation of the rotatable input mechanism, replacing the display of the representative image with a second image from the sequence of images; 
 detecting a second user input representing a selection of the second image as the representative image; 
 after detecting the second user input representing a selection of the second image as the representative image, detecting, with the motion sensor, a second motion indicative of a wrist raise gesture; and 
 in response to detecting the second motion indicative of a wrist raise gesture, displaying the background of the user interface on the display of the electronic device based on the sequence of images with the second image as the representative image. 
 
     
     
       38. The electronic device of  claim 33 ,
 wherein the sequence of images includes a first image, a last image, and a representative image, and 
 wherein displaying the background based on the sequence of images includes:
 displaying, in sequence, the representative image and the first set of one or more images from the sequence of images that are positioned after the representative image including the last image. 
 
 
     
     
       39. The electronic device of  claim 38 , the one or more programs further including instructions for:
 after displaying the first set of images, detecting a user input; and 
 in response to detecting the user input, displaying, in sequence, a second set of one or more images from the sequence of images that are positioned before the representative image and the representative image. 
 
     
     
       40. The electronic device of  claim 38 , the one or more programs further including instructions for:
 after displaying the first set of images, detecting a user input including a first portion and a second portion after the first portion; 
 in response to the first portion of the user input, displaying, in sequence, a second set of one or more images from the sequence of images that are positioned before the representative image; and 
 in response to the second portion of the user input, displaying, in sequence, a third set of one or more images from the sequence of images that are positioned before or include the representative image, 
 wherein the one or more images of the second set are positioned before the one or more images of third set, the second set includes the first image, and the third set includes the representative image. 
 
     
     
       41. The electronic device of  claim 38 , the one or more programs further including instructions for:
 after displaying the first set of images, detecting a rotation of the rotatable input mechanism; 
 in response to the rotation of the rotatable input mechanism, replacing the display of the last image with a second image from the sequence of images; 
 detecting a second user input representing a selection of the second image as the representative image; 
 after detecting the second user input representing a selection of the second image as the representative image, detecting, with the motion sensor, a second motion indicative of a wrist raise gesture; and 
 in response to detecting the second motion indicative of a wrist raise gesture, displaying the background of the user interface on the display of the electronic device based on the sequence of images with the second image as the representative image. 
 
     
     
       42. The electronic device of  claim 33 ,
 wherein the sequence of images includes a first image, a last image, and a representative image, and 
 wherein displaying the background based on the sequence of images includes:
 displaying, in sequence, the first set of images from the sequence of images including the representative image, one or more images positioned after the representative image, one or more images positioned before the representative image, and the representative image. 
 
 
     
     
       43. The electronic device of  claim 42 , the one or more programs further including instructions for:
 after displaying the first set of images, detecting a user input; and 
 in response to detecting the user input, displaying, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image including the last image. 
 
     
     
       44. The electronic device of  claim 42 , the one or more programs further including instructions for:
 after displaying the first set of images, detecting a user input including a first portion and a second portion after the first portion; 
 in response to the first portion of the user input, displaying, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image; and 
 in response to the second portion of the user input, displaying, in sequence, a third set of one or more images from the sequence of images that are positioned after the representative image and displaying the last image, 
 wherein the one or more images of the second set of images is before the one or more images of the third set of images. 
 
     
     
       45. The electronic device of  claim 42 , the one or more programs further including instructions for:
 after displaying the first set of images, detecting a rotation of the rotatable input mechanism; 
 in response to the rotation of the rotatable input mechanism, replacing the display of the representative image with a second image from the sequence of images; 
 detecting a second user input representing a selection of the second image as the representative image; 
 after detecting the second user input representing a selection of the second image as the representative image, detecting, with the motion sensor, a second motion indicative of a wrist raise gesture; and 
 in response to detecting the second motion indicative of a wrist raise gesture, displaying the background of the user interface on the display of the electronic device based on the sequence of images with the second image as the representative image. 
 
     
     
       46. The electronic device of  claim 33 , wherein the user interface comprises:
 the background; 
 a first user interface object indicating a time of day; and 
 a second user interface object indicating a date. 
 
     
     
       47. The electronic device of  claim 46 , wherein the appearance of the second user interface object is blended with the background. 
     
     
       48. The electronic device of  claim 33 , the one or more programs further including instructions for:
 while maintaining display of the image from the sequence of images, detecting a user input; and 
 in response to detecting the user input, displaying, in sequence, a second set of one or more images from the sequence of images, different than the first set of one or more images.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to U.S. Provisional Application Ser. No. 62/172,223, “Reduced Size User Interface,” filed Jun. 7, 2015; U.S. Provisional Application Ser. No. 62/129,754, “Reduced Size User Interface,” filed Mar. 6, 2015; and U.S. Provisional Application Ser. No. 62/044,959, “Reduced Size User Interface,” filed Sep. 2, 2014, the contents of which are hereby incorporated by reference in their entirety. 
     This application also relates to the following provisional applications: U.S. Patent Application Ser. No. 62/005,793, entitled “Companion Application for Activity Cooperation,” filed May 30, 2014; and U.S. Patent Application Ser. No. 62/005,751, entitled “Predefined Wireless Pairing,” filed May 30, 2014. This application relates to the following applications: International Patent Application Serial No. PCT/US2013/040087, entitled “Device, Method, and Graphical User Interface for Moving a User Interface Object Based on an Intensity of a Press Input,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040072, entitled “Device, Method, and Graphical User Interface for Providing Feedback for Changing Activation States of a User Interface Object,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040070, entitled “Device, Method, and Graphical User Interface for Providing Tactile Feedback for Operations Performed in a User Interface,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040067, entitled “Device, Method, and Graphical User Interface for Facilitating User Interaction with Controls in a User Interface,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040061, entitled “Device, Method, and Graphical User Interface for Displaying User Interface Objects Corresponding to an Application,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040058, entitled “Device, Method, and Graphical User Interface for Displaying Additional Information in Response to a User Contact,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040056, entitled “Device, Method, and Graphical User Interface for Scrolling Nested Regions,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040054, entitled “Device, Method, and Graphical User Interface for Manipulating Framed Graphical Objects,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/069489, entitled “Device, Method, and Graphical User Interface for Switching Between User Interfaces,” filed Nov. 11, 2013; International Patent Application Serial No. PCT/US2013/069486, entitled “Device, Method, and Graphical User Interface for Determining Whether to Scroll or Select Content,” filed Nov. 11, 2013; International Patent Application Serial No. PCT/US2013/069484, entitled “Device, Method, and Graphical User Interface for Moving a Cursor According to a Change in an Appearance of a Control Icon with Simulated Three-Dimensional Characteristics,” filed Nov. 11, 2013; International Patent Application Serial No. PCT/US2013/069483, entitled “Device, Method, and Graphical User Interface for Transitioning Between Touch Input to Display Output Relationships,” filed Nov. 11, 2013; International Patent Application Serial No. PCT/US2013/069479, entitled “Device, Method, and Graphical User Interface for Forgoing Generation of Tactile Output for a Multi-Contact Gesture,” filed Nov. 11, 2013; International Patent Application Serial No. PCT/US2013/069472, entitled “Device, Method, and Graphical User Interface for Navigating User Interface Hierarchies,” filed Nov. 11, 2013; International Patent Application Serial No. PCT/US2013/040108, entitled “Device, Method, and Graphical User Interface for Moving and Dropping a User Interface Object,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040101, entitled “Device, Method, and Graphical User Interface for Selecting User Interface Objects,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040098, entitled “Device, Method, and Graphical User Interface for Displaying Content Associated with a Corresponding Affordance,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040093, entitled “Device, Method, and Graphical User Interface for Transitioning Between Display States in Response to a Gesture,” filed May 8, 2013; International Patent Application Serial No. PCT/US2013/040053, entitled “Device, Method, and Graphical User Interface for Selecting Object within a Group of Objects,” filed May 8, 2013; U.S. Patent Application Ser. No. 61/778,211, entitled “Device, Method, and Graphical User Interface for Facilitating User Interaction with Controls in a User Interface,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,191, entitled “Device, Method, and Graphical User Interface for Displaying User Interface Objects Corresponding to an Application,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,171, entitled “Device, Method, and Graphical User Interface for Displaying Additional Information in Response to a User Contact,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,179, entitled “Device, Method and Graphical User Interface for Scrolling Nested Regions,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,156, entitled “Device, Method, and Graphical User Interface for Manipulating Framed Graphical Objects,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,125, entitled “Device, Method, And Graphical User Interface for Navigating User Interface Hierarchies,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,092, entitled “Device, Method, and Graphical User Interface for Selecting Object Within a Group of Objects,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,418, entitled “Device, Method, and Graphical User Interface for Switching Between User Interfaces,” filed Mar. 13, 2013; U.S. Patent Application Ser. No. 61/778,416, entitled “Device, Method, and Graphical User Interface for Determining Whether to Scroll or Select Content,” filed Mar. 13, 2013; U.S. Patent Application Ser. No. 61/747,278, entitled “Device, Method, and Graphical User Interface for Manipulating User Interface Objects with Visual and/or Haptic Feedback,” filed Dec. 29, 2012; U.S. Patent Application Ser. No. 61/778,414, entitled “Device, Method, and Graphical User Interface for Moving and Dropping a User Interface Object,” filed Mar. 13, 2013; U.S. Patent Application Ser. No. 61/778,413, entitled “Device, Method, and Graphical User Interface for Selecting User Interface Objects,” filed Mar. 13, 2013; U.S. Patent Application Ser. No. 61/778,412, entitled “Device, Method, and Graphical User Interface for Displaying Content Associated with a Corresponding Affordance,” filed Mar. 13, 2013; U.S. Patent Application Ser. No. 61/778,373, entitled “Device, Method, and Graphical User Interface for Managing Activation of a Control Based on Contact Intensity,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,265, entitled “Device, Method, and Graphical User Interface for Transitioning Between Display States in Response to a Gesture,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,367, entitled “Device, Method, and Graphical User Interface for Moving a User Interface Object Based on an Intensity of a Press Input,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,363, entitled “Device, Method, and Graphical User Interface for Transitioning Between Touch Input to Display Output Relationships,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,287, entitled “Device, Method, and Graphical User Interface for Providing Feedback for Changing Activation States of a User Interface Object,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,284, entitled “Device, Method, and Graphical User Interface for Providing Tactile Feedback for Operations Performed in a User Interface,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/778,239, entitled “Device, Method, and Graphical User Interface for Forgoing Generation of Tactile Output for a Multi-Contact Gesture,” filed Mar. 12, 2013; U.S. Patent Application Ser. No. 61/688,227, entitled “Device, Method, and Graphical User Interface for Manipulating User Interface Objects with Visual and/or Haptic Feedback,” filed May 9, 2012; U.S. Patent Application No. 62/005,958, “Canned Answers in Messages,” filed May 30, 2014. The content of these applications are hereby incorporated by reference in their entirety. 
    
    
     FIELD 
     The present disclosure relates generally to computer user interfaces, and more specifically to techniques for providing a multimedia application on a reduced size user interface. 
     BACKGROUND 
     Modern electronic devices may include the ability to run various programs, including applications that allow a user to navigate and view photos on a display of the device (e.g., a touch-sensitive display). Recent advances in computer technology have enabled manufacturers to produce such electronic devices in relatively small form factors. One challenge created by a small form factor, is that the display may be small, which can make it difficult for a user to navigate and view photos on the device. 
     Another challenge is that a small form factor may limit the storage capacity of a device. Furthermore, due to the increased size of modern imaging arrays, photo image files often require large amounts of memory to store. The lack of memory on a small device may permit storage of only a limited number of photos. 
     BRIEF SUMMARY 
     The present disclosure provides, inter alia, the benefit of user-friendly techniques and reduced size user interfaces for accessing, navigating, and displaying photos on devices with small form factors. 
     In some embodiments, a method comprises: at an electronic device with a touch-sensitive display and a rotatable input mechanism: receiving, via wireless communication, data representing a collection of photos stored on an external device; displaying, on the touch-sensitive display, a user interface including a user interface object, the user interface object representing the collection of photos; detecting a first user interaction with the displayed user interface object; in response to detecting the first user interaction with the displayed user interface object, replacing the display of the user interface with a display of a first view of an image, the image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other, and wherein, in the first view, the first representation and the second representation are displayed at a first size; detecting a first movement of the rotatable input mechanism; and in response to detecting the first movement of the rotatable input mechanism, transitioning the display of the first view of the image to a display of a second view of the image, wherein, in the second view, the first representation and the second representation are displayed at a second size different than the first size. 
     In some embodiments, a method comprises: at an electronic device with a touch-sensitive display and a rotatable input mechanism: receiving, via wireless communication, data representing a collection of photos stored on an external device; displaying, on the touch-sensitive display, a user interface including a user interface object, the user interface object representing the collection of photos; detecting a user interaction with the displayed user interface object; in response to detecting the user interaction with the displayed user interface object, replacing the display of the user interface with a display of a first view of an image, the image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other, and wherein, in the first view, the first representation and the second representation are displayed at a first size; detecting a contact on the touch-sensitive display while the first view is displayed; determining whether the contact represents a selection of the first representation; and in response to a determination that the contact represents a selection of the first representation, transitioning the display of the first view of the image to a display of a second view of the image, wherein, in the second view, the first representation and the second representation are displayed at a second size that is larger than the first size, and wherein the first representation is displayed at the center of the second view of the image. 
     In some embodiments, a method comprises: at an electronic device with a touch-sensitive display and a rotatable input mechanism: receiving, via wireless communication, data representing a collection of photos stored on an external device; displaying, on the touch-sensitive display, a user interface including a user interface object, the user interface object representing the collection of photos; detecting a user interaction with the displayed user interface object; in response to detecting the user interaction with the displayed user interface object, replacing the display of the user interface with an image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other; detecting a first point of contact of a contact on the touch-sensitive display, wherein the first point of contact corresponds to a first location on the image; determining whether the duration of the contact exceeds a predetermined threshold; and in response to a determination that the duration of the contact exceeds the predetermined threshold, displaying an enlarged view of a portion of the image surrounding or adjacent to the first location. 
     In some embodiments, a method comprises: at an electronic device with a touch-sensitive display and a rotatable input mechanism, wherein the touch-sensitive display comprises one or more sensors to detect the intensity of contacts with the touch-sensitive display: receiving, via wireless communication, data representing a first collection of photos and a second collection photos, wherein the first and second collections are stored on an external device; displaying, on the touch-sensitive display, a user interface including a user interface object representing the first collection; detecting a user interaction with the user interface object; in response to detecting the user interaction with the user interface object, replacing the display of the user interface with a display of a first image representative of the first collection of photos; detecting, while the first image is displayed, a contact on the touch-sensitive display; determining whether the contact has a characteristic intensity above a threshold intensity; and in response to a determination that the characteristic intensity is above the threshold intensity, replacing the display of the first image with a display of a second image representative of the second collection of photos. 
     In some embodiments, a method comprises: at an electronic device with a touch-sensitive display and a rotatable input mechanism, wherein the touch-sensitive display comprises one or more sensors to detect the intensity of contacts with the touch-sensitive display: receiving, via wireless communication, data representing a collection of photos stored on an external device; displaying, on the touch-sensitive display, at least one of the photos in the collection; detecting a contact on the touch-sensitive display at a location of a first photo of the at least one displayed photos; determining whether the contact has a characteristic intensity above a threshold intensity; and in response to a determination that the characteristic intensity is above the threshold intensity, displaying a user interface menu including at least one user interface object, wherein the user interface object represents an option to share the first photo or display the first photo as a background of a user interface on the display of the electronic device. 
     In some embodiments, an electronic device comprises: a touch-sensitive display unit configured to display a graphic user interface and receive contacts; a rotatable input mechanism unit configured to receive rotational input; a wireless communication unit configured to transmit and receive wireless communication; and a processing unit coupled to the touch-sensitive display unit, the rotatable input mechanism unit, and the wireless communication unit, the processing unit configured to: receive, via wireless communication by the wireless communication unit, data representing a collection of photos stored on an external device; enable display, on the touch-sensitive display unit, of a user interface including a user interface object, the user interface object representing the collection of photos; detect a first user interaction with the displayed user interface object; in response to detecting the first user interaction with the displayed user interface object, enable replacement of the display of the user interface with a display of a first view of an image, the image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other, and wherein, in the first view, the first representation and the second representation are displayed at a first size; detect a first movement of the rotatable input mechanism unit; and in response to detecting the first movement of the rotatable input mechanism unit, enable transition from the display of the first view of the image to a display of a second view of the image, wherein, in the second view, the first representation and the second representation are displayed at a second size different than the first size. 
     In some embodiments, an electronic device comprises: a touch-sensitive display unit configured to display a graphic user interface and receive contacts; a rotatable input mechanism unit configured to receive rotational input; a wireless communication unit configured to transmit and receive wireless communication; and a processing unit coupled to the touch-sensitive display unit, the rotatable input mechanism unit, and the wireless communication unit, the processing unit configured to: receive, via wireless communication by the wireless communication unit, data representing a collection of photos stored on an external device; enable display, on the touch-sensitive display unit, of a user interface including a user interface object, the user interface object representing the collection of photos; detect a user interaction with the displayed user interface object; in response to detecting the user interaction with the displayed user interface object, enable replacement of the display of the user interface with a display of a first view of an image, the image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other, and wherein, in the first view, the first representation and the second representation are displayed at a first size; detect a contact on the touch-sensitive display unit while the first view is displayed; determine whether the contact represents a selection of the first representation; and in response to a determination that the contact represents a selection of the first representation, enable transition from the display of the first view of the image to a display of a second view of the image, wherein, in the second view, the first representation and the second representation are displayed at a second size that is larger than the first size, and wherein the first representation is displayed at the center of the second view of the image. 
     In some embodiments, an electronic device comprises: a touch-sensitive display unit configured to display a graphic user interface and receive contacts; a rotatable input mechanism unit configured to receive rotational input; a wireless communication unit configured to transmit and receive wireless communication; and a processing unit coupled to the touch-sensitive display unit, the rotatable input mechanism unit, and the wireless communication unit, the processing unit configured to: receive, via wireless communication by the wireless communication unit, data representing a collection of photos stored on an external device; enable display, on the touch-sensitive display unit, of a user interface including a user interface object, the user interface object representing the collection of photos; detect a user interaction with the displayed user interface object; in response to detecting the user interaction with the displayed user interface object, enable replacement of the display of the user interface with an image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other; detect a first point of contact of a contact on the touch-sensitive display unit, wherein the first point of contact corresponds to a first location on the image; determine whether the duration of the contact exceeds a predetermined threshold; and in response to a determination that the duration of the contact exceeds the predetermined threshold, enable display of an enlarged view of a portion of the image surrounding or adjacent to the first location. 
     In some embodiments, an electronic device comprises: a touch-sensitive display unit configured to display a graphic user interface and receive contacts, wherein the touch-sensitive display unit comprises one or more intensity sensor units to detect the intensity of contacts with the touch-sensitive display unit; a rotatable input mechanism unit configured to receive rotational input; a wireless communication unit configured to transmit and receive wireless communication; and a processing unit coupled to the touch-sensitive display unit, the one or more intensity sensor units, the rotatable input mechanism unit, and the wireless communication unit, the processing unit configured to: receive, via wireless communication by the wireless communication unit, data representing a first collection of photos and a second collection photos, wherein the first and second collections are stored on an external device; enable display, on the touch-sensitive display unit, of a user interface including a user interface object representing the first collection; detect a user interaction with the user interface object; in response to detecting the user interaction with the user interface object, enable replacement of the display of the user interface with a display of a first image representative of the first collection of photos; detect, while the first image is displayed, a contact on the touch-sensitive display unit; determine whether the contact has a characteristic intensity above a threshold intensity; and in response to a determination that the characteristic intensity is above the threshold intensity, enable replacement of the display of the first image with a display of a second image representative of the second collection of photos. 
     In some embodiments, an electronic device comprises: a touch-sensitive display unit configured to display a graphic user interface and receive contacts, wherein the touch-sensitive display unit comprises one or more intensity sensor units to detect the intensity of contacts with the touch-sensitive display unit; a rotatable input mechanism unit configured to receive rotational input; a wireless communication unit configured to transmit and receive wireless communication; and a processing unit coupled to the touch-sensitive display unit, the one or more intensity sensor units, the rotatable input mechanism unit, and the wireless communication unit, the processing unit configured to: receive, via wireless communication by the wireless communication unit, data representing a collection of photos stored on an external device; enable display, on the touch-sensitive display unit, of at least one of the photos in the collection; detect a contact on the touch-sensitive display unit at a location of a first photo of the at least one displayed photos; determine whether the contact has a characteristic intensity above a threshold intensity; and in response to a determination that the characteristic intensity is above the threshold intensity, enable display of a user interface menu including at least one user interface object, wherein the user interface object represents an option to share the first photo or display the first photo as a background of a user interface on the display of the electronic device. 
     In some embodiments, an electronic device comprises: a touch-sensitive display; a rotatable input mechanism; one or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for: receiving, via wireless communication, data representing a collection of photos stored on an external device; displaying, on the touch-sensitive display, a user interface including a user interface object, the user interface object representing the collection of photos; detecting a first user interaction with the displayed user interface object; in response to detecting the first user interaction with the displayed user interface object, replacing the display of the user interface with a display of a first view of an image, the image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other, and wherein, in the first view, the first representation and the second representation are displayed at a first size; detecting a first movement of the rotatable input mechanism; and in response to detecting the first movement of the rotatable input mechanism, transitioning the display of the first view of the image to a display of a second view of the image, wherein, in the second view, the first representation and the second representation are displayed at a second size different than the first size. 
     In some embodiments, an electronic device comprises: a touch-sensitive display; a rotatable input mechanism; one or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for: receiving, via wireless communication, data representing a collection of photos stored on an external device; displaying, on the touch-sensitive display, a user interface including a user interface object, the user interface object representing the collection of photos; detecting a user interaction with the displayed user interface object; in response to detecting the user interaction with the displayed user interface object, replacing the display of the user interface with a display of a first view of an image, the image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other, and wherein, in the first view, the first representation and the second representation are displayed at a first size; detecting a contact on the touch-sensitive display while the first view is displayed; determining whether the contact represents a selection of the first representation; and in response to a determination that the contact represents a selection of the first representation, transitioning the display of the first view of the image to a display of a second view of the image, wherein, in the second view, the first representation and the second representation are displayed at a second size that is larger than the first size, and wherein the first representation is displayed at the center of the second view of the image. 
     In some embodiments, an electronic device comprises: a touch-sensitive display; a rotatable input mechanism; one or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for: receiving, via wireless communication, data representing a collection of photos stored on an external device; displaying, on the touch-sensitive display, a user interface including a user interface object, the user interface object representing the collection of photos; detecting a user interaction with the displayed user interface object; in response to detecting the user interaction with the displayed user interface object, replacing the display of the user interface with an image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other; detecting a first point of contact of a contact on the touch-sensitive display, wherein the first point of contact corresponds to a first location on the image; determining whether the duration of the contact exceeds a predetermined threshold; and in response to a determination that the duration of the contact exceeds the predetermined threshold, displaying an enlarged view of a portion of the image surrounding or adjacent to the first location. 
     In some embodiments, an electronic device comprises: a touch-sensitive display, wherein the touch-sensitive display comprises one or more sensors to detect the intensity of contacts with the touch-sensitive display; a rotatable input mechanism; one or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for: receiving, via wireless communication, data representing a first collection of photos and a second collection photos, wherein the first and second collections are stored on an external device; displaying, on the touch-sensitive display, a user interface including a user interface object representing the first collection; detecting a user interaction with the user interface object; in response to detecting the user interaction with the user interface object, replacing the display of the user interface with a display of a first image representative of the first collection of photos; detecting, while the first image is displayed, a contact on the touch-sensitive display; determining whether the contact has a characteristic intensity above a threshold intensity; and in response to a determination that the characteristic intensity is above the threshold intensity, replacing the display of the first image with a display of a second image representative of the second collection of photos. 
     In some embodiments, an electronic device comprises: a touch-sensitive display, wherein the touch-sensitive display comprises one or more sensors to detect the intensity of contacts with the touch-sensitive display; a rotatable input mechanism; one or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for: receiving, via wireless communication, data representing a collection of photos stored on an external device; displaying, on the touch-sensitive display, at least one of the photos in the collection; detecting a contact on the touch-sensitive display at a location of a first photo of the at least one displayed photos; determining whether the contact has a characteristic intensity above a threshold intensity; and in response to a determination that the characteristic intensity is above the threshold intensity, displaying a user interface menu including at least one user interface object, wherein the user interface object represents an option to share the first photo or display the first photo as a background of a user interface on the display of the electronic device. 
     In some embodiments, a non-transitory computer-readable storage medium stores one or more programs, the one or more programs comprising instructions, which when executed by one or more processors of an electronic device with a touch-sensitive display and a rotatable input mechanism, cause the electronic device to: receive, via wireless communication, data representing a collection of photos stored on an external device; display, on the touch-sensitive display, a user interface including a user interface object, the user interface object representing the collection of photos; detect a first user interaction with the displayed user interface object; in response to detecting the first user interaction with the displayed user interface object, replace the display of the user interface with a display of a first view of an image, the image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other, and wherein, in the first view, the first representation and the second representation are displayed at a first size; detect a first movement of the rotatable input mechanism; and in response to detecting the first movement of the rotatable input mechanism, transition the display of the first view of the image to a display of a second view of the image, wherein, in the second view, the first representation and the second representation are displayed at a second size different than the first size. 
     In some embodiments, a non-transitory computer-readable storage medium stores one or more programs, the one or more programs comprising instructions, which when executed by one or more processors of an electronic device with a touch-sensitive display and a rotatable input mechanism, cause the electronic device to: receive, via wireless communication, data representing a collection of photos stored on an external device; display, on the touch-sensitive display, a user interface including a user interface object, the user interface object representing the collection of photos; detect a user interaction with the displayed user interface object; in response to detecting the user interaction with the displayed user interface object, replace the display of the user interface with a display of a first view of an image, the image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other, and wherein, in the first view, the first representation and the second representation are displayed at a first size; detect a contact on the touch-sensitive display while the first view is displayed; determine whether the contact represents a selection of the first representation; and in response to a determination that the contact represents a selection of the first representation, transition the display of the first view of the image to a display of a second view of the image, wherein, in the second view, the first representation and the second representation are displayed at a second size that is larger than the first size, and wherein the first representation is displayed at the center of the second view of the image. 
     In some embodiments, a non-transitory computer-readable storage medium stores one or more programs, the one or more programs comprising instructions, which when executed by one or more processors of an electronic device with a touch-sensitive display and a rotatable input mechanism, cause the electronic device to: receive, via wireless communication, data representing a collection of photos stored on an external device; display, on the touch-sensitive display, a user interface including a user interface object, the user interface object representing the collection of photos; detect a user interaction with the displayed user interface object; in response to detecting the user interaction with the displayed user interface object, replace the display of the user interface with an image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other; detect a first point of contact of a contact on the touch-sensitive display, wherein the first point of contact corresponds to a first location on the image; determine whether the duration of the contact exceeds a predetermined threshold; and in response to a determination that the duration of the contact exceeds the predetermined threshold, display an enlarged view of a portion of the image surrounding or adjacent to the first location. 
     In some embodiments, a non-transitory computer-readable storage medium stores one or more programs, the one or more programs comprising instructions, which when executed by one or more processors of an electronic device with a touch-sensitive display and a rotatable input mechanism, wherein the touch-sensitive display comprises one or more sensors to detect the intensity of contacts with the touch-sensitive display, cause the electronic device to: receive, via wireless communication, data representing a first collection of photos and a second collection photos, wherein the first and second collections are stored on an external device; display, on the touch-sensitive display, a user interface including a user interface object representing the first collection; detect a user interaction with the user interface object; in response to detecting the user interaction with the user interface object, replace the display of the user interface with a display of a first image representative of the first collection of photos; detect, while the first image is displayed, a contact on the touch-sensitive display; determine whether the contact has a characteristic intensity above a threshold intensity; and in response to a determination that the characteristic intensity is above the threshold intensity, replace the display of the first image with a display of a second image representative of the second collection of photos. 
     In some embodiments, a non-transitory computer-readable storage medium stores one or more programs, the one or more programs comprising instructions, which when executed by one or more processors of an electronic device with a touch-sensitive display and a rotatable input mechanism, wherein the touch-sensitive display comprises one or more sensors to detect the intensity of contacts with the touch-sensitive display, cause the electronic device to: receive, via wireless communication, data representing a collection of photos stored on an external device; display, on the touch-sensitive display, at least one of the photos in the collection; detect a contact on the touch-sensitive display at a location of a first photo of the at least one displayed photos; determine whether the contact has a characteristic intensity above a threshold intensity; and in response to a determination that the characteristic intensity is above the threshold intensity, display a user interface menu including at least one user interface object, wherein the user interface object represents an option to share the first photo or display the first photo as a background of a user interface on the display of the electronic device. 
     In some embodiments, a transitory computer-readable medium includes one or more programs comprising instructions, which when executed by one or more processors of an electronic device with a touch-sensitive display and a rotatable input mechanism, cause the electronic device to: receive, via wireless communication, data representing a collection of photos stored on an external device; display, on the touch-sensitive display, a user interface including a user interface object, the user interface object representing the collection of photos; detect a first user interaction with the displayed user interface object; in response to detecting the first user interaction with the displayed user interface object, replace the display of the user interface with a display of a first view of an image, the image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other, and wherein, in the first view, the first representation and the second representation are displayed at a first size; detect a first movement of the rotatable input mechanism; and in response to detecting the first movement of the rotatable input mechanism, transition the display of the first view of the image to a display of a second view of the image, wherein, in the second view, the first representation and the second representation are displayed at a second size different than the first size. 
     In some embodiments, a transitory computer-readable medium includes one or more programs comprising instructions, which when executed by one or more processors of an electronic device with a touch-sensitive display and a rotatable input mechanism, cause the electronic device to: receive, via wireless communication, data representing a collection of photos stored on an external device; display, on the touch-sensitive display, a user interface including a user interface object, the user interface object representing the collection of photos; detect a user interaction with the displayed user interface object; in response to detecting the user interaction with the displayed user interface object, replace the display of the user interface with a display of a first view of an image, the image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other, and wherein, in the first view, the first representation and the second representation are displayed at a first size; detect a contact on the touch-sensitive display while the first view is displayed; determine whether the contact represents a selection of the first representation; and in response to a determination that the contact represents a selection of the first representation, transition the display of the first view of the image to a display of a second view of the image, wherein, in the second view, the first representation and the second representation are displayed at a second size that is larger than the first size, and wherein the first representation is displayed at the center of the second view of the image. 
     In some embodiments, a transitory computer-readable medium includes one or more programs comprising instructions, which when executed by one or more processors of an electronic device with a touch-sensitive display and a rotatable input mechanism, cause the electronic device to: receive, via wireless communication, data representing a collection of photos stored on an external device; display, on the touch-sensitive display, a user interface including a user interface object, the user interface object representing the collection of photos; detect a user interaction with the displayed user interface object; in response to detecting the user interaction with the displayed user interface object, replace the display of the user interface with an image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other; detect a first point of contact of a contact on the touch-sensitive display, wherein the first point of contact corresponds to a first location on the image; determine whether the duration of the contact exceeds a predetermined threshold; and in response to a determination that the duration of the contact exceeds the predetermined threshold, display an enlarged view of a portion of the image surrounding or adjacent to the first location. 
     In some embodiments, a transitory computer-readable medium includes one or more programs comprising instructions, which when executed by one or more processors of an electronic device with a touch-sensitive display and a rotatable input mechanism, wherein the touch-sensitive display comprises one or more sensors to detect the intensity of contacts with the touch-sensitive display, cause the electronic device to: receive, via wireless communication, data representing a first collection of photos and a second collection photos, wherein the first and second collections are stored on an external device; display, on the touch-sensitive display, a user interface including a user interface object representing the first collection; detect a user interaction with the user interface object; in response to detecting the user interaction with the user interface object, replace the display of the user interface with a display of a first image representative of the first collection of photos; detect, while the first image is displayed, a contact on the touch-sensitive display; determine whether the contact has a characteristic intensity above a threshold intensity; and in response to a determination that the characteristic intensity is above the threshold intensity, replace the display of the first image with a display of a second image representative of the second collection of photos. 
     In some embodiments, a transitory computer-readable medium includes one or more programs comprising instructions, which when executed by one or more processors of an electronic device with a touch-sensitive display and a rotatable input mechanism, wherein the touch-sensitive display comprises one or more sensors to detect the intensity of contacts with the touch-sensitive display, cause the electronic device to: receive, via wireless communication, data representing a collection of photos stored on an external device; display, on the touch-sensitive display, at least one of the photos in the collection; detect a contact on the touch-sensitive display at a location of a first photo of the at least one displayed photos; determine whether the contact has a characteristic intensity above a threshold intensity; and in response to a determination that the characteristic intensity is above the threshold intensity, display a user interface menu including at least one user interface object, wherein the user interface object represents an option to share the first photo or display the first photo as a background of a user interface on the display of the electronic device. 
     In some embodiments, an electronic device comprises: a touch-sensitive display; a rotatable input mechanism; and means for receiving, via wireless communication, data representing a collection of photos stored on an external device; means for displaying, on the touch-sensitive display, a user interface including a user interface object, the user interface object representing the collection of photos; means for detecting a first user interaction with the displayed user interface object; means responsive to detecting the first user interaction with the displayed user interface object for: replacing the display of the user interface with a display of a first view of an image, the image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other, and wherein, in the first view, the first representation and the second representation are displayed at a first size; means for detecting a first movement of the rotatable input mechanism; and means responsive to detecting the first movement of the rotatable input mechanism for: transitioning the display of the first view of the image to a display of a second view of the image, wherein, in the second view, the first representation and the second representation are displayed at a second size different than the first size. 
     In some embodiments, an electronic device comprises: a touch-sensitive display; a rotatable input mechanism; and means for receiving, via wireless communication, data representing a collection of photos stored on an external device; means for displaying, on the touch-sensitive display, a user interface including a user interface object, the user interface object representing the collection of photos; means for detecting a user interaction with the displayed user interface object; means responsive to detecting the user interaction with the displayed user interface object for: replacing the display of the user interface with a display of a first view of an image, the image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other, and wherein, in the first view, the first representation and the second representation are displayed at a first size; means for detecting a contact on the touch-sensitive display while the first view is displayed; means for determining whether the contact represents a selection of the first representation; and means responsive to a determination that the contact represents a selection of the first representation for: transitioning the display of the first view of the image to a display of a second view of the image, wherein, in the second view, the first representation and the second representation are displayed at a second size that is larger than the first size, and wherein the first representation is displayed at the center of the second view of the image. 
     In some embodiments, an electronic device comprises: a touch-sensitive display; a rotatable input mechanism; means for receiving, via wireless communication, data representing a collection of photos stored on an external device; means for displaying, on the touch-sensitive display, a user interface including a user interface object, the user interface object representing the collection of photos; means for detecting a user interaction with the displayed user interface object; means responsive to detecting the user interaction with the displayed user interface object for: replacing the display of the user interface with an image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other; means for detecting a first point of contact of a contact on the touch-sensitive display, wherein the first point of contact corresponds to a first location on the image; means for determining whether the duration of the contact exceeds a predetermined threshold; and means responsive to a determination that the duration of the contact exceeds the predetermined threshold for: displaying an enlarged view of a portion of the image surrounding or adjacent to the first location. 
     In some embodiments, an electronic device comprises: a touch-sensitive display, wherein the touch-sensitive display comprises one or more sensors to detect the intensity of contacts with the touch-sensitive display; a rotatable input mechanism; and means for receiving, via wireless communication, data representing a first collection of photos and a second collection photos, wherein the first and second collections are stored on an external device; means for displaying, on the touch-sensitive display, a user interface including a user interface object representing the first collection; means for detecting a user interaction with the user interface object; means responsive to detecting the user interaction with the user interface object for: replacing the display of the user interface with a display of a first image representative of the first collection of photos; means for detecting, while the first image is displayed, a contact on the touch-sensitive display; means for determining whether the contact has a characteristic intensity above a threshold intensity; and means responsive to a determination that the characteristic intensity is above the threshold intensity for: replacing the display of the first image with a display of a second image representative of the second collection of photos. 
     In some embodiments, an electronic device comprises: a touch-sensitive display, wherein the touch-sensitive display comprises one or more sensors to detect the intensity of contacts with the touch-sensitive display; a rotatable input mechanism; and means for receiving, via wireless communication, data representing a collection of photos stored on an external device; means for displaying, on the touch-sensitive display, at least one of the photos in the collection; means for detecting a contact on the touch-sensitive display at a location of a first photo of the at least one displayed photos; means for determining whether the contact has a characteristic intensity above a threshold intensity; and means responsive to a determination that the characteristic intensity is above the threshold intensity for: displaying a user interface menu including at least one user interface object, wherein the user interface object represents an option to share the first photo or display the first photo as a background of a user interface on the display of the electronic device. 
     In some embodiments, a method includes: at an electronic device with a touch-sensitive display, a rotatable input mechanism, and a motion sensor configured to sense motion indicative of a wrist raise gesture, wherein the touch-sensitive display comprises one or more sensors to detect the intensity of contacts with the touch-sensitive display: receiving, via wireless communication, data representing a sequence of images stored on an external device; displaying, on the touch-sensitive display, a representation of the sequence of images; detecting a contact on the touch-sensitive display at a location of the representation of the sequence of images; determining whether the contact has a characteristic intensity above a threshold intensity; in response to a determination that the characteristic intensity is above the threshold intensity, displaying a user interface menu including a user interface object, where the user interface object represents an option to display a background of a user interface on the display of the electronic device based on the sequence of images; detecting a selection of the user interface object; detecting, with the motion sensor, a motion indicative of a wrist raise gesture; and in response to detecting the motion indicative of a wrist raise gesture, displaying the background of the user interface on the display of the electronic device based on the sequence of images. 
     In some embodiments, an electronic device includes: a touch-sensitive display unit configured to display a graphic user interface and receive contacts, wherein the touch-sensitive display unit comprises one or more intensity sensor units to detect the intensity of contacts with the touch-sensitive display unit; a rotatable input mechanism unit configured to receive rotational input; a wireless communication unit configured to transmit and receive wireless communication; a motion sensor unit configured to sense motion indicative of a wrist raise gesture; and a processing unit coupled to the touch-sensitive display unit, the one or more intensity sensor units, the rotatable input mechanism unit, the motion sensor unit, and the wireless communication unit, the processing unit configured to: receive, via the wireless communication unit, data representing a sequence of images stored on an external device; enable, on the touch-sensitive display unit, display of a representation of the sequence of images; detect a contact on the touch-sensitive display unit at a location of the representation of the sequence of images; determine whether the contact has a characteristic intensity above a threshold intensity; in response to a determination that the characteristic intensity is above the threshold intensity, enable display of a user interface menu including a user interface object, where the user interface object represents an option to display a background of a user interface on the touch-sensitive display unit of the electronic device based on the sequence of images; detect a selection of the user interface object; detect, with the motion sensor unit, a motion indicative of a wrist raise gesture; and in response to detecting the motion indicative of a wrist raise gesture, enable display of the background of the user interface on the touch-sensitive display unit of the electronic device based on the sequence of images. 
     In some embodiments, an electronic device includes: a touch-sensitive display; a rotatable input mechanism; a motion sensor configured to sense motion indicative of a wrist raise gesture; one or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for: receiving, via wireless communication, data representing a sequence of images stored on an external device; displaying, on the touch-sensitive display, a representation of the sequence of images; detecting a contact on the touch-sensitive display at a location of the representation of the sequence of images; determining whether the contact has a characteristic intensity above a threshold intensity; in response to a determination that the characteristic intensity is above the threshold intensity, displaying a user interface menu including a user interface object, where the user interface object represents an option to display a background of a user interface on the display of the electronic device based on the sequence of images; detecting a selection of the user interface object; detecting, with the motion sensor, a motion indicative of a wrist raise gesture; and in response to detecting the motion indicative of a wrist raise gesture, displaying the background of the user interface on the display of the electronic device based on the sequence of images. 
     In some embodiments, a non-transitory computer-readable storage medium includes one or more programs, the one or more programs comprising instructions, which when executed by one or more processors of an electronic device with a touch-sensitive display and a rotatable input mechanism, cause the electronic device to: receive, via wireless communication, data representing a sequence of images stored on an external device; display, on the touch-sensitive display, a representation of the sequence of images; detect a contact on the touch-sensitive display at a location of the representation of the sequence of images; determine whether the contact has a characteristic intensity above a threshold intensity; in response to a determination that the characteristic intensity is above the threshold intensity, display a user interface menu including a user interface object, where the user interface object represents an option to display a background of a user interface on the display of the electronic device based on the sequence of images; detect a selection of the user interface object; detect, with the motion sensor, a motion indicative of a wrist raise gesture; and in response to detecting the motion indicative of a wrist raise gesture, display the background of the user interface on the display of the electronic device based on the sequence of images. 
     In some embodiments, a transitory computer-readable medium includes one or more programs, the one or more programs comprising instructions, which when executed by one or more processors of an electronic device with a touch-sensitive display and a rotatable input mechanism, cause the electronic device to: receive, via wireless communication, data representing a sequence of images stored on an external device; display, on the touch-sensitive display, a representation of the sequence of images; detect a contact on the touch-sensitive display at a location of the representation of the sequence of images; determine whether the contact has a characteristic intensity above a threshold intensity; in response to a determination that the characteristic intensity is above the threshold intensity, display a user interface menu including a user interface object, where the user interface object represents an option to display a background of a user interface on the display of the electronic device based on the sequence of images; detect a selection of the user interface object; detect, with the motion sensor, a motion indicative of a wrist raise gesture; and in response to detecting the motion indicative of a wrist raise gesture, display the background of the user interface on the display of the electronic device based on the sequence of images. 
     In some embodiments, an electronic device includes: a touch-sensitive display; a rotatable input mechanism; and means for receiving, via wireless communication, data representing a sequence of images stored on an external device; means for displaying, on the touch-sensitive display, a representation of the sequence of images; means for detecting a contact on the touch-sensitive display at a location of the representation of the sequence of images; means for determining whether the contact has a characteristic intensity above a threshold intensity; means for, in response to a determination that the characteristic intensity is above the threshold intensity, displaying a user interface menu including a user interface object, where the user interface object represents an option to display a background of a user interface on the display of the electronic device based on the sequence of images; means for detecting a selection of the user interface object; means for detecting, with the motion sensor, a motion indicative of a wrist raise gesture; and means for, in response to detecting the motion indicative of a wrist raise gesture, displaying the background of the user interface on the display of the electronic device based on the sequence of images. 
    
    
     
       DESCRIPTION OF THE FIGURES 
       For a better understanding of the various described embodiments, reference should be made to the Description of Embodiments below, in conjunction with the following drawings in which like reference numerals refer to corresponding parts throughout the figures. 
         FIG. 1A  is a block diagram illustrating a portable multifunction device with a touch-sensitive display in accordance with some embodiments. 
         FIG. 1B  is a block diagram illustrating exemplary components for event handling in accordance with some embodiments. 
         FIG. 2  illustrates a portable multifunction device having a touch screen in accordance with some embodiments. 
         FIG. 3  is a block diagram of an exemplary multifunction device with a display and a touch-sensitive surface in accordance with some embodiments. 
         FIG. 4A  illustrates an exemplary user interface for a menu of applications on a portable multifunction device in accordance with some embodiments. 
         FIG. 4B  illustrates an exemplary user interface for a multifunction device with a touch-sensitive surface that is separate from the display in accordance with some embodiments. 
         FIG. 5A  illustrates a personal electronic device in accordance with some embodiments. 
         FIG. 5B  is a block diagram illustrating a personal electronic device in accordance with some embodiments. 
         FIGS. 5C-5D  illustrate exemplary components of a personal electronic device having a touch-sensitive display and intensity sensors in accordance with some embodiments. 
         FIGS. 5E-5H  illustrate exemplary components and user interfaces of a personal electronic device in accordance with some embodiments. 
         FIG. 6A  illustrates an exemplary user interface for launching a photos application. 
         FIG. 6B  illustrates an exemplary user interface with a representation of a collection of photos. 
         FIGS. 7A-7D  illustrate exemplary photos application user interfaces in accordance with some embodiments. 
         FIGS. 8A-8C  illustrate exemplary photos application user interfaces in accordance with some embodiments. 
         FIGS. 9A-9F  illustrate exemplary photos application user interfaces in accordance with some embodiments. 
         FIG. 10A-10D  illustrate exemplary photos application user interfaces in accordance with some embodiments. 
         FIG. 11A-11D  illustrate exemplary photos application user interfaces in accordance with some embodiments. 
         FIGS. 12A-12B  illustrate exemplary photos application user interfaces in accordance with some embodiments. 
         FIGS. 13A-13D  illustrate exemplary photos application user interfaces in accordance with some embodiments. 
         FIGS. 14A-14B  illustrate exemplary photos application user interfaces in accordance with some embodiments. 
         FIGS. 15A-15C  illustrate exemplary photos application user interfaces in accordance with some embodiments. 
         FIG. 16A-16C  illustrates exemplary photos application user interfaces in accordance with some embodiments. 
         FIG. 17A-17L  illustrates exemplary photos application user interfaces in accordance with some embodiments. 
         FIG. 18A-18D  illustrates exemplary photos application user interfaces in accordance with some embodiments. 
         FIG. 19  illustrates exemplary photos application user interfaces in accordance with some embodiments. 
         FIG. 20  illustrates exemplary photos application user interfaces in accordance with some embodiments. 
         FIG. 21A-21D  illustrates exemplary photos application user interfaces in accordance with some embodiments. 
         FIG. 22  is a flow diagram illustrating a process for displaying photos on an electronic device in accordance with some embodiments. 
         FIG. 23  is a flow diagram illustrating a process for displaying photos on an electronic device in accordance with some embodiments. 
         FIG. 24  is a flow diagram illustrating a process for displaying photos on an electronic device in accordance with some embodiments. 
         FIG. 25  is a flow diagram illustrating a process for displaying photos on an electronic device in accordance with some embodiments. 
         FIG. 26  is a flow diagram illustrating a process for displaying photos on an electronic device in accordance with some embodiments. 
         FIG. 27  is a functional block diagram of an electronic device in accordance with some embodiments. 
         FIG. 28  is a functional block diagram of an electronic device in accordance with some embodiments. 
         FIG. 29  is a functional block diagram of an electronic device in accordance with some embodiments. 
         FIG. 30  is a functional block diagram of an electronic device in accordance with some embodiments. 
         FIG. 31  is a functional block diagram of an electronic device in accordance with some embodiments. 
         FIGS. 32A-32D  is a flow diagram illustrating a process for using a sequence of images to display a background on an electronic device in accordance with some embodiments. 
         FIG. 33  is a functional block diagram of an electronic device in accordance with some embodiments. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     The following description sets forth exemplary methods, parameters and the like. It should be recognized, however, that such description is not intended as a limitation on the scope of the present disclosure but is instead provided as a description of exemplary embodiments. 
     The present disclosure provides, inter alia, the benefit of electronic devices that provide efficient methods and interfaces for accessing, navigating, and displaying photos on devices with small form factors. Such techniques can reduce the cognitive burden on a user who accesses, navigates, and displays photos on devices with small form factors, thereby enhancing productivity. Such methods and interfaces may also reduce the number of unnecessary, extraneous, repetitive, and/or redundant inputs, and may create a faster and more efficient user interface arrangement, which may reduce the number of required inputs, reduce processing power, and reduce the amount of time for which user interfaces need to be displayed in order for desired functions to be accessed and carried out. Further, such techniques can reduce processor and battery power otherwise wasted on redundant user inputs. 
     It should be recognized that certain aspects of this disclosure may be applied to various types of media including, for example, image files, video files, audio files, sequences of images (e.g., stored as a single file), animated Graphics Interchange Format (GIF) files. For example, a photos application or other multimedia application may provide the capability to access, navigate, and display a combination of photos, videos, sequences of images, animated GIF files, and/or collections thereof. 
     Below,  FIGS. 1A-1B, 2, 3, 4A-4B, 5A-5B, and 27-31  provide a description of exemplary devices for performing techniques associated with a photos application (e.g., accessing, browsing, navigating, and/or displaying photos).  FIGS. 6A-21D  illustrate exemplary user interfaces for performing techniques associated with a photos application (e.g., accessing, browsing, navigating, and/or displaying photos).  FIGS. 22-26  are flow diagrams illustrating methods of performing techniques associated with a photos application (e.g., accessing, browsing, navigating, and/or displaying photos) in accordance with some embodiments. The user interfaces in  FIGS. 6A-21D  are used to illustrate the processes described below, including the processes in  FIGS. 22-26 . 
     Although the following description uses terms “first,” “second,” etc. to describe various elements, these elements should not be limited by the terms. These terms are only used to distinguish one element from another. For example, a first touch could be termed a second touch, and, similarly, a second touch could be termed a first touch, without departing from the scope of the various described embodiments. The first touch and the second touch are both touches, but they are not the same touch. 
     The terminology used in the description of the various described embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various described embodiments and the appended claims, the singular forms “a”, “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term “and/or” as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. It will be further understood that the terms “includes,” “including,” “comprises,” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     The term “if” may be construed to mean “when” or “upon” or “in response to determining” or “in response to detecting,” depending on the context. Similarly, the phrase “if it is determined” or “if [a stated condition or event] is detected” may be construed to mean “upon determining” or “in response to determining” or “upon detecting [the stated condition or event]” or “in response to detecting [the stated condition or event],” depending on the context. 
     Embodiments of electronic devices, user interfaces for such devices, and associated processes for using such devices are described. In some embodiments, the device is a portable communications device, such as a mobile telephone, that also contains other functions, such as PDA and/or music player functions. Exemplary embodiments of portable multifunction devices include, without limitation, the iPhone®, iPod Touch®, and iPad® devices from Apple Inc. of Cupertino, Calif. Other portable electronic devices, such as laptops or tablet computers with touch-sensitive surfaces (e.g., touch screen displays and/or touchpads), are, optionally, used. It should also be understood that, in some embodiments, the device is not a portable communications device, but is a desktop computer with a touch-sensitive surface (e.g., a touch screen display and/or a touchpad). 
     In the discussion that follows, an electronic device that includes a display and a touch-sensitive surface is described. It should be understood, however, that the electronic device optionally includes one or more other physical user-interface devices, such as a physical keyboard, a mouse, and/or a joystick. 
     The device may support a variety of applications, such as one or more of the following: a drawing application, a presentation application, a word processing application, a website creation application, a disk authoring application, a spreadsheet application, a gaming application, a telephone application, a video conferencing application, an e-mail application, an instant messaging application, a workout support application, a photo management application, a digital camera application, a digital video camera application, a web browsing application, a digital music player application, and/or a digital video player application. 
     The various applications that are executed on the device optionally use at least one common physical user-interface device, such as the touch-sensitive surface. One or more functions of the touch-sensitive surface as well as corresponding information displayed on the device are, optionally, adjusted and/or varied from one application to the next and/or within a respective application. In this way, a common physical architecture (such as the touch-sensitive surface) of the device optionally supports the variety of applications with user interfaces that are intuitive and transparent to the user. 
     Attention is now directed toward embodiments of portable devices with touch-sensitive displays.  FIG. 1A  is a block diagram illustrating portable multifunction device  100  with touch-sensitive display system  112  in accordance with some embodiments. Touch-sensitive display  112  is sometimes called a “touch screen” for convenience and is sometimes known as or called a “touch-sensitive display system.” Device  100  includes memory  102  (which optionally includes one or more computer-readable storage mediums), memory controller  122 , one or more processing units (CPUs)  120 , peripherals interface  118 , RF circuitry  108 , audio circuitry  110 , speaker  111 , microphone  113 , input/output (I/O) subsystem  106 , other input control devices  116 , and external port  124 . Device  100  optionally includes one or more optical sensors  164 . Device  100  optionally includes one or more contact intensity sensors  165  for detecting intensity of contacts on device  100  (e.g., a touch-sensitive surface such as touch-sensitive display system  112  of device  100 ). Device  100  optionally includes one or more tactile output generators  167  for generating tactile outputs on device  100  (e.g., generating tactile outputs on a touch-sensitive surface such as touch-sensitive display system  112  of device  100  or touchpad  355  of device  300 ). These components optionally communicate over one or more communication buses or signal lines  103 . 
     As used in the specification and claims, the term “intensity” of a contact on a touch-sensitive surface refers to the force or pressure (force per unit area) of a contact (e.g., a finger contact) on the touch-sensitive surface, or to a substitute (proxy) for the force or pressure of a contact on the touch-sensitive surface. The intensity of a contact has a range of values that includes at least four distinct values and more typically includes hundreds of distinct values (e.g., at least 256). Intensity of a contact is, optionally, determined (or measured) using various approaches and various sensors or combinations of sensors. For example, one or more force sensors underneath or adjacent to the touch-sensitive surface are, optionally, used to measure force at various points on the touch-sensitive surface. In some implementations, force measurements from multiple force sensors are combined (e.g., a weighted average) to determine an estimated force of a contact. Similarly, a pressure-sensitive tip of a stylus is, optionally, used to determine a pressure of the stylus on the touch-sensitive surface. Alternatively, the size of the contact area detected on the touch-sensitive surface and/or changes thereto, the capacitance of the touch-sensitive surface proximate to the contact and/or changes thereto, and/or the resistance of the touch-sensitive surface proximate to the contact and/or changes thereto are, optionally, used as a substitute for the force or pressure of the contact on the touch-sensitive surface. In some implementations, the substitute measurements for contact force or pressure are used directly to determine whether an intensity threshold has been exceeded (e.g., the intensity threshold is described in units corresponding to the substitute measurements). In some implementations, the substitute measurements for contact force or pressure are converted to an estimated force or pressure, and the estimated force or pressure is used to determine whether an intensity threshold has been exceeded (e.g., the intensity threshold is a pressure threshold measured in units of pressure). Using the intensity of a contact as an attribute of a user input allows for user access to additional device functionality that may otherwise not be accessible by the user on a reduced-size device with limited real estate for displaying affordances (e.g., on a touch-sensitive display) and/or receiving user input (e.g., via a touch-sensitive display, a touch-sensitive surface, or a physical/mechanical control such as a knob or a button). 
     As used in the specification and claims, the term “tactile output” refers to physical displacement of a device relative to a previous position of the device, physical displacement of a component (e.g., a touch-sensitive surface) of a device relative to another component (e.g., housing) of the device, or displacement of the component relative to a center of mass of the device that will be detected by a user with the user&#39;s sense of touch. For example, in situations where the device or the component of the device is in contact with a surface of a user that is sensitive to touch (e.g., a finger, palm, or other part of a user&#39;s hand), the tactile output generated by the physical displacement will be interpreted by the user as a tactile sensation corresponding to a perceived change in physical characteristics of the device or the component of the device. For example, movement of a touch-sensitive surface (e.g., a touch-sensitive display or trackpad) is, optionally, interpreted by the user as a “down click” or “up click” of a physical actuator button. In some cases, a user will feel a tactile sensation such as an “down click” or “up click” even when there is no movement of a physical actuator button associated with the touch-sensitive surface that is physically pressed (e.g., displaced) by the user&#39;s movements. As another example, movement of the touch-sensitive surface is, optionally, interpreted or sensed by the user as “roughness” of the touch-sensitive surface, even when there is no change in smoothness of the touch-sensitive surface. While such interpretations of touch by a user will be subject to the individualized sensory perceptions of the user, there are many sensory perceptions of touch that are common to a large majority of users. Thus, when a tactile output is described as corresponding to a particular sensory perception of a user (e.g., an “up click,” a “down click,” “roughness”), unless otherwise stated, the generated tactile output corresponds to physical displacement of the device or a component thereof that will generate the described sensory perception for a typical (or average) user. 
     It should be appreciated that device  100  is only one example of a portable multifunction device, and that device  100  optionally has more or fewer components than shown, optionally combines two or more components, or optionally has a different configuration or arrangement of the components. The various components shown in  FIG. 1A  are implemented in hardware, software, or a combination of both hardware and software, including one or more signal processing and/or application specific integrated circuits. 
     Memory  102  may include one or more computer-readable storage mediums. The computer-readable storage mediums may be tangible and non-transitory. Memory  102  may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid-state memory devices. Memory controller  122  may control access to memory  102  by other components of device  100 . 
     Peripherals interface  118  can be used to couple input and output peripherals of the device to CPU  120  and memory  102 . The one or more processors  120  run or execute various software programs and/or sets of instructions stored in memory  102  to perform various functions for device  100  and to process data. In some embodiments, peripherals interface  118 , CPU  120 , and memory controller  122  may be implemented on a single chip, such as chip  104 . In some other embodiments, they may be implemented on separate chips. 
     RF (radio frequency) circuitry  108  receives and sends RF signals, also called electromagnetic signals. RF circuitry  108  converts electrical signals to/from electromagnetic signals and communicates with communications networks and other communications devices via the electromagnetic signals. RF circuitry  108  optionally includes well-known circuitry for performing these functions, including but not limited to an antenna system, an RF transceiver, one or more amplifiers, a tuner, one or more oscillators, a digital signal processor, a CODEC chipset, a subscriber identity module (SIM) card, memory, and so forth. RF circuitry  108  optionally communicates with networks, such as the Internet, also referred to as the World Wide Web (WWW), an intranet and/or a wireless network, such as a cellular telephone network, a wireless local area network (LAN) and/or a metropolitan area network (MAN), and other devices by wireless communication. The RF circuitry  108  optionally includes well-known circuitry for detecting near field communication (NFC) fields, such as by a short-range communication radio. The wireless communication optionally uses any of a plurality of communications standards, protocols, and technologies, including but not limited to Global System for Mobile Communications (GSM), Enhanced Data GSM Environment (EDGE), high-speed downlink packet access (HSDPA), high-speed uplink packet access (HSUPA), Evolution, Data-Only (EV-DO), HSPA, HSPA+, Dual-Cell HSPA (DC-HSPDA), long term evolution (LTE), near field communication (NFC), wideband code division multiple access (W-CDMA), code division multiple access (CDMA), time division multiple access (TDMA), Bluetooth, Bluetooth Low Energy (BTLE), Wireless Fidelity (Wi-Fi) (e.g., IEEE 802.11a, IEEE 802.11b, IEEE 802.11g, IEEE 802.11n, and/or IEEE 802.11ac), voice over Internet Protocol (VoIP), Wi-MAX, a protocol for e-mail (e.g., Internet message access protocol (IMAP) and/or post office protocol (POP)), instant messaging (e.g., extensible messaging and presence protocol (XMPP), Session Initiation Protocol for Instant Messaging and Presence Leveraging Extensions (SIMPLE), Instant Messaging and Presence Service (IMPS)), and/or Short Message Service (SMS), or any other suitable communication protocol, including communication protocols not yet developed as of the filing date of this document. 
     Audio circuitry  110 , speaker  111 , and microphone  113  provide an audio interface between a user and device  100 . Audio circuitry  110  receives audio data from peripherals interface  118 , converts the audio data to an electrical signal, and transmits the electrical signal to speaker  111 . Speaker  111  converts the electrical signal to human-audible sound waves. Audio circuitry  110  also receives electrical signals converted by microphone  113  from sound waves. Audio circuitry  110  converts the electrical signal to audio data and transmits the audio data to peripherals interface  118  for processing. Audio data may be retrieved from and/or transmitted to memory  102  and/or RF circuitry  108  by peripherals interface  118 . In some embodiments, audio circuitry  110  also includes a headset jack (e.g.,  212 ,  FIG. 2 ). The headset jack provides an interface between audio circuitry  110  and removable audio input/output peripherals, such as output-only headphones or a headset with both output (e.g., a headphone for one or both ears) and input (e.g., a microphone). 
     I/O subsystem  106  couples input/output peripherals on device  100 , such as touch screen  112  and other input control devices  116 , to peripherals interface  118 . I/O subsystem  106  optionally includes display controller  156 , optical sensor controller  158 , intensity sensor controller  159 , haptic feedback controller  161 , and one or more input controllers  160  for other input or control devices. The one or more input controllers  160  receive/send electrical signals from/to other input control devices  116 . The other input control devices  116  optionally include physical buttons (e.g., push buttons, rocker buttons, etc.), dials, slider switches, joysticks, click wheels, and so forth. In some alternate embodiments, input controller(s)  160  are, optionally, coupled to any (or none) of the following: a keyboard, an infrared port, a USB port, and a pointer device such as a mouse. The one or more buttons (e.g.,  208 ,  FIG. 2 ) optionally include an up/down button for volume control of speaker  111  and/or microphone  113 . The one or more buttons optionally include a push button (e.g.,  206 ,  FIG. 2 ). 
     A quick press of the push button may disengage a lock of touch screen  112  or begin a process that uses gestures on the touch screen to unlock the device, as described in U.S. patent application Ser. No. 11/322,549, “Unlocking a Device by Performing Gestures on an Unlock Image,” filed Dec. 23, 2005, U.S. Pat. No. 7,657,849, which is hereby incorporated by reference in its entirety. A longer press of the push button (e.g.,  206 ) may turn power to device  100  on or off. The user may be able to customize a functionality of one or more of the buttons. Touch screen  112  is used to implement virtual or soft buttons and one or more soft keyboards. 
     Touch-sensitive display  112  provides an input interface and an output interface between the device and a user. Display controller  156  receives and/or sends electrical signals from/to touch screen  112 . Touch screen  112  displays visual output to the user. The visual output may include graphics, text, icons, video, and any combination thereof (collectively termed “graphics”). In some embodiments, some or all of the visual output may correspond to user-interface objects. 
     Touch screen  112  has a touch-sensitive surface, sensor, or set of sensors that accepts input from the user based on haptic and/or tactile contact. Touch screen  112  and display controller  156  (along with any associated modules and/or sets of instructions in memory  102 ) detect contact (and any movement or breaking of the contact) on touch screen  112  and convert the detected contact into interaction with user-interface objects (e.g., one or more soft keys, icons, web pages, or images) that are displayed on touch screen  112 . In an exemplary embodiment, a point of contact between touch screen  112  and the user corresponds to a finger of the user. 
     Touch screen  112  may use LCD (liquid crystal display) technology, LPD (light emitting polymer display) technology, or LED (light emitting diode) technology, although other display technologies may be used in other embodiments. Touch screen  112  and display controller  156  may detect contact and any movement or breaking thereof using any of a plurality of touch sensing technologies now known or later developed, including but not limited to capacitive, resistive, infrared, and surface acoustic wave technologies, as well as other proximity sensor arrays or other elements for determining one or more points of contact with touch screen  112 . In an exemplary embodiment, projected mutual capacitance sensing technology is used, such as that found in the iPhone® and iPod Touch® from Apple Inc. of Cupertino, Calif. 
     A touch-sensitive display in some embodiments of touch screen  112  may be analogous to the multi-touch sensitive touchpads described in the following U.S. Pat. No. 6,323,846 (Westerman et al.), U.S. Pat. No. 6,570,557 (Westerman et al.), and/or U.S. Pat. No. 6,677,932 (Westerman), and/or U.S. Patent Publication 2002/0015024A1, each of which is hereby incorporated by reference in its entirety. However, touch screen  112  displays visual output from device  100 , whereas touch-sensitive touchpads do not provide visual output. 
     A touch-sensitive display in some embodiments of touch screen  112  may be as described in the following applications: (1) U.S. patent application Ser. No. 11/381,313, “Multipoint Touch Surface Controller,” filed May 2, 2006; (2) U.S. patent application Ser. No. 10/840,862, “Multipoint Touchscreen,” filed May 6, 2004; (3) U.S. patent application Ser. No. 10/903,964, “Gestures For Touch Sensitive Input Devices,” filed Jul. 30, 2004; (4) U.S. patent application Ser. No. 11/048,264, “Gestures For Touch Sensitive Input Devices,” filed Jan. 31, 2005; (5) U.S. patent application Ser. No. 11/038,590, “Mode-Based Graphical User Interfaces For Touch Sensitive Input Devices,” filed Jan. 18, 2005; (6) U.S. patent application Ser. No. 11/228,758, “Virtual Input Device Placement On A Touch Screen User Interface,” filed Sep. 16, 2005; (7) U.S. patent application Ser. No. 11/228,700, “Operation Of A Computer With A Touch Screen Interface,” filed Sep. 16, 2005; (8) U.S. patent application Ser. No. 11/228,737, “Activating Virtual Keys Of A Touch-Screen Virtual Keyboard,” filed Sep. 16, 2005; and (9) U.S. patent application Ser. No. 11/367,749, “Multi-Functional Hand-Held Device,” filed Mar. 3, 2006. All of these applications are incorporated by reference herein in their entirety. 
     Touch screen  112  may have a video resolution in excess of 100 dpi. In some embodiments, the touch screen has a video resolution of approximately 160 dpi. The user may make contact with touch screen  112  using any suitable object or appendage, such as a stylus, a finger, and so forth. In some embodiments, the user interface is designed to work primarily with finger-based contacts and gestures, which can be less precise than stylus-based input due to the larger area of contact of a finger on the touch screen. In some embodiments, the device translates the rough finger-based input into a precise pointer/cursor position or command for performing the actions desired by the user. 
     In some embodiments, in addition to the touch screen, device  100  may include a touchpad (not shown) for activating or deactivating particular functions. In some embodiments, the touchpad is a touch-sensitive area of the device that, unlike the touch screen, does not display visual output. The touchpad may be a touch-sensitive surface that is separate from touch screen  112  or an extension of the touch-sensitive surface formed by the touch screen. 
     Device  100  also includes power system  162  for powering the various components. Power system  162  may include a power management system, one or more power sources (e.g., battery, alternating current (AC)), a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator (e.g., a light-emitting diode (LED)) and any other components associated with the generation, management and distribution of power in portable devices. 
     Device  100  may also include one or more optical sensors  164 .  FIG. 1A  shows an optical sensor coupled to optical sensor controller  158  in I/O subsystem  106 . Optical sensor  164  may include charge-coupled device (CCD) or complementary metal-oxide semiconductor (CMOS) phototransistors. Optical sensor  164  receives light from the environment, projected through one or more lenses, and converts the light to data representing an image. In conjunction with imaging module  143  (also called a camera module), optical sensor  164  may capture still images or video. In some embodiments, an optical sensor is located on the back of device  100 , opposite touch screen display  112  on the front of the device so that the touch screen display may be used as a viewfinder for still and/or video image acquisition. In some embodiments, an optical sensor is located on the front of the device so that the user&#39;s image may be obtained for video conferencing while the user views the other video conference participants on the touch screen display. In some embodiments, the position of optical sensor  164  can be changed by the user (e.g., by rotating the lens and the sensor in the device housing) so that a single optical sensor  164  may be used along with the touch screen display for both video conferencing and still and/or video image acquisition. 
     Device  100  optionally also includes one or more contact intensity sensors  165 .  FIG. 1A  shows a contact intensity sensor coupled to intensity sensor controller  159  in I/O subsystem  106 . Contact intensity sensor  165  optionally includes one or more piezoresistive strain gauges, capacitive force sensors, electric force sensors, piezoelectric force sensors, optical force sensors, capacitive touch-sensitive surfaces, or other intensity sensors (e.g., sensors used to measure the force (or pressure) of a contact on a touch-sensitive surface). Contact intensity sensor  165  receives contact intensity information (e.g., pressure information or a proxy for pressure information) from the environment. In some embodiments, at least one contact intensity sensor is collocated with, or proximate to, a touch-sensitive surface (e.g., touch-sensitive display system  112 ). In some embodiments, at least one contact intensity sensor is located on the back of device  100 , opposite touch screen display  112 , which is located on the front of device  100 . 
     Device  100  may also include one or more proximity sensors  166 .  FIG. 1A  shows proximity sensor  166  coupled to peripherals interface  118 . Alternately, proximity sensor  166  may be coupled to input controller  160  in I/O subsystem  106 . Proximity sensor  166  may perform as described in U.S. patent application Ser. No. 11/241,839, “Proximity Detector In Handheld Device”; Ser. No. 11/240,788, “Proximity Detector In Handheld Device”; Ser. No. 11/620,702, “Using Ambient Light Sensor To Augment Proximity Sensor Output”; Ser. No. 11/586,862, “Automated Response To And Sensing Of User Activity In Portable Devices”; and Ser. No. 11/638,251, “Methods And Systems For Automatic Configuration Of Peripherals,” which are hereby incorporated by reference in their entirety. In some embodiments, the proximity sensor turns off and disables touch screen  112  when the multifunction device is placed near the user&#39;s ear (e.g., when the user is making a phone call). 
     Device  100  optionally also includes one or more tactile output generators  167 .  FIG. 1A  shows a tactile output generator coupled to haptic feedback controller  161  in I/O subsystem  106 . Tactile output generator  167  optionally includes one or more electroacoustic devices such as speakers or other audio components and/or electromechanical devices that convert energy into linear motion such as a motor, solenoid, electroactive polymer, piezoelectric actuator, electrostatic actuator, or other tactile output generating component (e.g., a component that converts electrical signals into tactile outputs on the device). Contact intensity sensor  165  receives tactile feedback generation instructions from haptic feedback module  133  and generates tactile outputs on device  100  that are capable of being sensed by a user of device  100 . In some embodiments, at least one tactile output generator is collocated with, or proximate to, a touch-sensitive surface (e.g., touch-sensitive display system  112 ) and, optionally, generates a tactile output by moving the touch-sensitive surface vertically (e.g., in/out of a surface of device  100 ) or laterally (e.g., back and forth in the same plane as a surface of device  100 ). In some embodiments, at least one tactile output generator sensor is located on the back of device  100 , opposite touch screen display  112 , which is located on the front of device  100 . 
     Device  100  may also include one or more accelerometers  168 .  FIG. 1A  shows accelerometer  168  coupled to peripherals interface  118 . Alternately, accelerometer  168  may be coupled to an input controller  160  in I/O subsystem  106 . Accelerometer  168  may perform as described in U.S. Patent Publication No. 20050190059, “Acceleration-based Theft Detection System for Portable Electronic Devices,” and U.S. Patent Publication No. 20060017692, “Methods And Apparatuses For Operating A Portable Device Based On An Accelerometer,” both of which are incorporated by reference herein in their entirety. In some embodiments, information is displayed on the touch screen display in a portrait view or a landscape view based on an analysis of data received from the one or more accelerometers. Device  100  optionally includes, in addition to accelerometer(s)  168 , a magnetometer (not shown) and a GPS (or GLONASS or other global navigation system) receiver (not shown) for obtaining information concerning the location and orientation (e.g., portrait or landscape) of device  100 . 
     In some embodiments, the software components stored in memory  102  include operating system  126 , communication module (or set of instructions)  128 , contact/motion module (or set of instructions)  130 , graphics module (or set of instructions)  132 , text input module (or set of instructions)  134 , Global Positioning System (GPS) module (or set of instructions)  135 , and applications (or sets of instructions)  136 . Furthermore, in some embodiments, memory  102  ( FIG. 1A ) or  370  ( FIG. 3 ) stores device/global internal state  157 , as shown in  FIGS. 1A and 3 . Device/global internal state  157  includes one or more of: active application state, indicating which applications, if any, are currently active; display state, indicating what applications, views or other information occupy various regions of touch screen display  112 ; sensor state, including information obtained from the device&#39;s various sensors and input control devices  116 ; and location information concerning the device&#39;s location and/or attitude. 
     Operating system  126  (e.g., Darwin, RTXC, LINUX, UNIX, OS X, iOS, WINDOWS, or an embedded operating system such as VxWorks) includes various software components and/or drivers for controlling and managing general system tasks (e.g., memory management, storage device control, power management, etc.) and facilitates communication between various hardware and software components. 
     Communication module  128  facilitates communication with other devices over one or more external ports  124  and also includes various software components for handling data received by RF circuitry  108  and/or external port  124 . External port  124  (e.g., Universal Serial Bus (USB), FIREWIRE, etc.) is adapted for coupling directly to other devices or indirectly over a network (e.g., the Internet, wireless LAN, etc.). In some embodiments, the external port is a multi-pin (e.g., 30-pin) connector that is the same as, or similar to and/or compatible with, the 30-pin connector used on iPod® (trademark of Apple Inc.) devices. 
     Contact/motion module  130  optionally detects contact with touch screen  112  (in conjunction with display controller  156 ) and other touch-sensitive devices (e.g., a touchpad or physical click wheel). Contact/motion module  130  includes various software components for performing various operations related to detection of contact, such as determining if contact has occurred (e.g., detecting a finger-down event), determining an intensity of the contact (e.g., the force or pressure of the contact or a substitute for the force or pressure of the contact), determining if there is movement of the contact and tracking the movement across the touch-sensitive surface (e.g., detecting one or more finger-dragging events), and determining if the contact has ceased (e.g., detecting a finger-up event or a break in contact). Contact/motion module  130  receives contact data from the touch-sensitive surface. Determining movement of the point of contact, which is represented by a series of contact data, optionally includes determining speed (magnitude), velocity (magnitude and direction), and/or an acceleration (a change in magnitude and/or direction) of the point of contact. These operations are, optionally, applied to single contacts (e.g., one finger contacts) or to multiple simultaneous contacts (e.g., “multitouch”/multiple finger contacts). In some embodiments, contact/motion module  130  and display controller  156  detect contact on a touchpad. 
     In some embodiments, contact/motion module  130  uses a set of one or more intensity thresholds to determine whether an operation has been performed by a user (e.g., to determine whether a user has “clicked” on an icon). In some embodiments, at least a subset of the intensity thresholds are determined in accordance with software parameters (e.g., the intensity thresholds are not determined by the activation thresholds of particular physical actuators and can be adjusted without changing the physical hardware of device  100 ). For example, a mouse “click” threshold of a trackpad or touch screen display can be set to any of a large range of predefined threshold values without changing the trackpad or touch screen display hardware. Additionally, in some implementations, a user of the device is provided with software settings for adjusting one or more of the set of intensity thresholds (e.g., by adjusting individual intensity thresholds and/or by adjusting a plurality of intensity thresholds at once with a system-level click “intensity” parameter). 
     Contact/motion module  130  optionally detects a gesture input by a user. Different gestures on the touch-sensitive surface have different contact patterns (e.g., different motions, timings, and/or intensities of detected contacts). Thus, a gesture is, optionally, detected by detecting a particular contact pattern. For example, detecting a finger tap gesture includes detecting a finger-down event followed by detecting a finger-up (liftoff) event at the same position (or substantially the same position) as the finger-down event (e.g., at the position of an icon). As another example, detecting a finger swipe gesture on the touch-sensitive surface includes detecting a finger-down event followed by detecting one or more finger-dragging events, and subsequently followed by detecting a finger-up (liftoff) event. 
     Graphics module  132  includes various known software components for rendering and displaying graphics on touch screen  112  or other display, including components for changing the visual impact (e.g., brightness, transparency, saturation, contrast, or other visual property) of graphics that are displayed. As used herein, the term “graphics” includes any object that can be displayed to a user, including, without limitation, text, web pages, icons (such as user-interface objects including soft keys), digital images, videos, animations, and the like. 
     In some embodiments, graphics module  132  stores data representing graphics to be used. Each graphic is, optionally, assigned a corresponding code. Graphics module  132  receives, from applications etc., one or more codes specifying graphics to be displayed along with, if necessary, coordinate data and other graphic property data, and then generates screen image data to output to display controller  156 . 
     Haptic feedback module  133  includes various software components for generating instructions used by tactile output generator(s)  167  to produce tactile outputs at one or more locations on device  100  in response to user interactions with device  100 . 
     Text input module  134 , which may be a component of graphics module  132 , provides soft keyboards for entering text in various applications (e.g., contacts  137 , e-mail  140 , IM  141 , browser  147 , and any other application that needs text input). 
     GPS module  135  determines the location of the device and provides this information for use in various applications (e.g., to telephone  138  for use in location-based dialing; to camera  143  as picture/video metadata; and to applications that provide location-based services such as weather widgets, local yellow page widgets, and map/navigation widgets). 
     Applications  136  may include the following modules (or sets of instructions), or a subset or superset thereof:
         Contacts module  137  (sometimes called an address book or contact list);   Telephone module  138 ;   Video conference module  139 ;   E-mail client module  140 ;   Instant messaging (IM) module  141 ;   Workout support module  142 ;   Camera module  143  for still and/or video images;   Image management module  144 ;   Video player module;   Music player module;   Browser module  147 ;   Calendar module  148 ;   Widget modules  149 , which may include one or more of: weather widget  149 - 1 , stocks widget  149 - 2 , calculator widget  149 - 3 , alarm clock widget  149 - 4 , dictionary widget  149 - 5 , and other widgets obtained by the user, as well as user-created widgets  149 - 6 ;   Widget creator module  150  for making user-created widgets  149 - 6 ;   Search module  151 ;   Video and music player module  152 , which merges video player module and music player module;   Notes module  153 ;   Map module  154 ; and/or   Online video module  155 .       

     Examples of other applications  136  that may be stored in memory  102  include other word processing applications, other image editing applications, drawing applications, presentation applications, JAVA-enabled applications, encryption, digital rights management, voice recognition, and voice replication. 
     In conjunction with touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , and text input module  134 , contacts module  137  may be used to manage an address book or contact list (e.g., stored in application internal state  192  of contacts module  137  in memory  102  or memory  370 ), including: adding name(s) to the address book; deleting name(s) from the address book; associating telephone number(s), e-mail address(es), physical address(es) or other information with a name; associating an image with a name; categorizing and sorting names; providing telephone numbers or e-mail addresses to initiate and/or facilitate communications by telephone  138 , video conference module  139 , e-mail  140 , or IM  141 ; and so forth. 
     In conjunction with RF circuitry  108 , audio circuitry  110 , speaker  111 , microphone  113 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , and text input module  134 , telephone module  138  may be used to enter a sequence of characters corresponding to a telephone number, access one or more telephone numbers in contacts module  137 , modify a telephone number that has been entered, dial a respective telephone number, conduct a conversation, and disconnect or hang up when the conversation is completed. As noted above, the wireless communication may use any of a plurality of communications standards, protocols, and technologies. 
     In conjunction with RF circuitry  108 , audio circuitry  110 , speaker  111 , microphone  113 , touch screen  112 , display controller  156 , optical sensor  164 , optical sensor controller  158 , contact/motion module  130 , graphics module  132 , text input module  134 , contacts module  137 , and telephone module  138 , video conference module  139  includes executable instructions to initiate, conduct, and terminate a video conference between a user and one or more other participants in accordance with user instructions. 
     In conjunction with RF circuitry  108 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , and text input module  134 , e-mail client module  140  includes executable instructions to create, send, receive, and manage e-mail in response to user instructions. In conjunction with image management module  144 , e-mail client module  140  makes it very easy to create and send e-mails with still or video images taken with camera module  143 . 
     In conjunction with RF circuitry  108 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , and text input module  134 , the instant messaging module  141  includes executable instructions to enter a sequence of characters corresponding to an instant message, to modify previously entered characters, to transmit a respective instant message (for example, using a Short Message Service (SMS) or Multimedia Message Service (MMS) protocol for telephony-based instant messages or using XMPP, SIMPLE, or IMPS for Internet-based instant messages), to receive instant messages, and to view received instant messages. In some embodiments, transmitted and/or received instant messages may include graphics, photos, audio files, video files and/or other attachments as are supported in an MMS and/or an Enhanced Messaging Service (EMS). As used herein, “instant messaging” refers to both telephony-based messages (e.g., messages sent using SMS or MMS) and Internet-based messages (e.g., messages sent using XMPP, SIMPLE, or IMPS). 
     In conjunction with RF circuitry  108 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , text input module  134 , GPS module  135 , map module  154 , and music player module, workout support module  142  includes executable instructions to create workouts (e.g., with time, distance, and/or calorie burning goals); communicate with workout sensors (sports devices); receive workout sensor data; calibrate sensors used to monitor a workout; select and play music for a workout; and display, store, and transmit workout data. 
     In conjunction with touch screen  112 , display controller  156 , optical sensor(s)  164 , optical sensor controller  158 , contact/motion module  130 , graphics module  132 , and image management module  144 , camera module  143  includes executable instructions to capture still images or video (including a video stream) and store them into memory  102 , modify characteristics of a still image or video, or delete a still image or video from memory  102 . 
     In conjunction with touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , text input module  134 , and camera module  143 , image management module  144  includes executable instructions to arrange, modify (e.g., edit), or otherwise manipulate, label, delete, present (e.g., in a digital slide show or album), and store still and/or video images. 
     In conjunction with RF circuitry  108 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , and text input module  134 , browser module  147  includes executable instructions to browse the Internet in accordance with user instructions, including searching, linking to, receiving, and displaying web pages or portions thereof, as well as attachments and other files linked to web pages. 
     In conjunction with RF circuitry  108 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , text input module  134 , e-mail client module  140 , and browser module  147 , calendar module  148  includes executable instructions to create, display, modify, and store calendars and data associated with calendars (e.g., calendar entries, to-do lists, etc.) in accordance with user instructions. 
     In conjunction with RF circuitry  108 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , text input module  134 , and browser module  147 , widget modules  149  are mini-applications that may be downloaded and used by a user (e.g., weather widget  149 - 1 , stocks widget  149 - 2 , calculator widget  149 - 3 , alarm clock widget  149 - 4 , and dictionary widget  149 - 5 ) or created by the user (e.g., user-created widget  149 - 6 ). In some embodiments, a widget includes an HTML (Hypertext Markup Language) file, a CSS (Cascading Style Sheets) file, and a JavaScript file. In some embodiments, a widget includes an XML (Extensible Markup Language) file and a JavaScript file (e.g., Yahoo! Widgets). 
     In conjunction with RF circuitry  108 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , text input module  134 , and browser module  147 , the widget creator module  150  may be used by a user to create widgets (e.g., turning a user-specified portion of a web page into a widget). 
     In conjunction with touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , and text input module  134 , search module  151  includes executable instructions to search for text, music, sound, image, video, and/or other files in memory  102  that match one or more search criteria (e.g., one or more user-specified search terms) in accordance with user instructions. 
     In conjunction with touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , audio circuitry  110 , speaker  111 , RF circuitry  108 , and browser module  147 , video and music player module  152  includes executable instructions that allow the user to download and play back recorded music and other sound files stored in one or more file formats, such as MP3 or AAC files, and executable instructions to display, present, or otherwise play back videos (e.g., on touch screen  112  or on an external, connected display via external port  124 ). In some embodiments, device  100  optionally includes the functionality of an MP3 player, such as an iPod (trademark of Apple Inc.). 
     In conjunction with touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , and text input module  134 , notes module  153  includes executable instructions to create and manage notes, to-do lists, and the like in accordance with user instructions. 
     In conjunction with RF circuitry  108 , touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , text input module  134 , GPS module  135 , and browser module  147 , map module  154  may be used to receive, display, modify, and store maps and data associated with maps (e.g., driving directions, data on stores and other points of interest at or near a particular location, and other location-based data) in accordance with user instructions. 
     In conjunction with touch screen  112 , display controller  156 , contact/motion module  130 , graphics module  132 , audio circuitry  110 , speaker  111 , RF circuitry  108 , text input module  134 , e-mail client module  140 , and browser module  147 , online video module  155  includes instructions that allow the user to access, browse, receive (e.g., by streaming and/or download), play back (e.g., on the touch screen or on an external, connected display via external port  124 ), send an e-mail with a link to a particular online video, and otherwise manage online videos in one or more file formats, such as H.264. In some embodiments, instant messaging module  141 , rather than e-mail client module  140 , is used to send a link to a particular online video. Additional description of the online video application can be found in U.S. Provisional Patent Application No. 60/936,562, “Portable Multifunction Device, Method, and Graphical User Interface for Playing Online Videos,” filed Jun. 20, 2007, and U.S. patent application Ser. No. 11/968,067, “Portable Multifunction Device, Method, and Graphical User Interface for Playing Online Videos,” filed Dec. 31, 2007, the contents of which are hereby incorporated by reference in their entirety. 
     Each of the above-identified modules and applications corresponds to a set of executable instructions for performing one or more functions described above and the methods described in this application (e.g., the computer-implemented methods and other information processing methods described herein). These modules (e.g., sets of instructions) need not be implemented as separate software programs, procedures, or modules, and thus various subsets of these modules may be combined or otherwise rearranged in various embodiments. For example, video player module may be combined with music player module into a single module (e.g., video and music player module  152 ,  FIG. 1A ). In some embodiments, memory  102  may store a subset of the modules and data structures identified above. Furthermore, memory  102  may store additional modules and data structures not described above. 
     In some embodiments, device  100  is a device where operation of a predefined set of functions on the device is performed exclusively through a touch screen and/or a touchpad. By using a touch screen and/or a touchpad as the primary input control device for operation of device  100 , the number of physical input control devices (such as push buttons, dials, and the like) on device  100  may be reduced. 
     The predefined set of functions that are performed exclusively through a touch screen and/or a touchpad optionally include navigation between user interfaces. In some embodiments, the touchpad, when touched by the user, navigates device  100  to a main, home, or root menu from any user interface that is displayed on device  100 . In such embodiments, a “menu button” is implemented using a touchpad. In some other embodiments, the menu button is a physical push button or other physical input control device instead of a touchpad. 
       FIG. 1B  is a block diagram illustrating exemplary components for event handling in accordance with some embodiments. In some embodiments, memory  102  ( FIG. 1A ) or  370  ( FIG. 3 ) includes event sorter  170  (e.g., in operating system  126 ) and a respective application  136 - 1  (e.g., any of the aforementioned applications  137 - 151 ,  155 ,  380 - 390 ). 
     Event sorter  170  receives event information and determines the application  136 - 1  and application view  191  of application  136 - 1  to which to deliver the event information. Event sorter  170  includes event monitor  171  and event dispatcher module  174 . In some embodiments, application  136 - 1  includes application internal state  192 , which indicates the current application view(s) displayed on touch-sensitive display  112  when the application is active or executing. In some embodiments, device/global internal state  157  is used by event sorter  170  to determine which application(s) is (are) currently active, and application internal state  192  is used by event sorter  170  to determine application views  191  to which to deliver event information. 
     In some embodiments, application internal state  192  includes additional information, such as one or more of: resume information to be used when application  136 - 1  resumes execution, user interface state information that indicates information being displayed or that is ready for display by application  136 - 1 , a state queue for enabling the user to go back to a prior state or view of application  136 - 1 , and a redo/undo queue of previous actions taken by the user. 
     Event monitor  171  receives event information from peripherals interface  118 . Event information includes information about a sub-event (e.g., a user touch on touch-sensitive display  112 , as part of a multi-touch gesture). Peripherals interface  118  transmits information it receives from I/O subsystem  106  or a sensor, such as proximity sensor  166 , accelerometer(s)  168 , and/or microphone  113  (through audio circuitry  110 ). Information that peripherals interface  118  receives from I/O subsystem  106  includes information from touch-sensitive display  112  or a touch-sensitive surface. 
     In some embodiments, event monitor  171  sends requests to the peripherals interface  118  at predetermined intervals. In response, peripherals interface  118  transmits event information. In other embodiments, peripherals interface  118  transmits event information only when there is a significant event (e.g., receiving an input above a predetermined noise threshold and/or for more than a predetermined duration). 
     In some embodiments, event sorter  170  also includes a hit view determination module  172  and/or an active event recognizer determination module  173 . 
     Hit view determination module  172  provides software procedures for determining where a sub-event has taken place within one or more views when touch-sensitive display  112  displays more than one view. Views are made up of controls and other elements that a user can see on the display. 
     Another aspect of the user interface associated with an application is a set of views, sometimes herein called application views or user interface windows, in which information is displayed and touch-based gestures occur. The application views (of a respective application) in which a touch is detected may correspond to programmatic levels within a programmatic or view hierarchy of the application. For example, the lowest level view in which a touch is detected may be called the hit view, and the set of events that are recognized as proper inputs may be determined based, at least in part, on the hit view of the initial touch that begins a touch-based gesture. 
     Hit view determination module  172  receives information related to sub-events of a touch-based gesture. When an application has multiple views organized in a hierarchy, hit view determination module  172  identifies a hit view as the lowest view in the hierarchy which should handle the sub-event. In most circumstances, the hit view is the lowest level view in which an initiating sub-event occurs (e.g., the first sub-event in the sequence of sub-events that form an event or potential event). Once the hit view is identified by the hit view determination module  172 , the hit view typically receives all sub-events related to the same touch or input source for which it was identified as the hit view. 
     Active event recognizer determination module  173  determines which view or views within a view hierarchy should receive a particular sequence of sub-events. In some embodiments, active event recognizer determination module  173  determines that only the hit view should receive a particular sequence of sub-events. In other embodiments, active event recognizer determination module  173  determines that all views that include the physical location of a sub-event are actively involved views, and therefore determines that all actively involved views should receive a particular sequence of sub-events. In other embodiments, even if touch sub-events were entirely confined to the area associated with one particular view, views higher in the hierarchy would still remain as actively involved views. 
     Event dispatcher module  174  dispatches the event information to an event recognizer (e.g., event recognizer  180 ). In embodiments including active event recognizer determination module  173 , event dispatcher module  174  delivers the event information to an event recognizer determined by active event recognizer determination module  173 . In some embodiments, event dispatcher module  174  stores in an event queue the event information, which is retrieved by a respective event receiver  182 . 
     In some embodiments, operating system  126  includes event sorter  170 . Alternatively, application  136 - 1  includes event sorter  170 . In yet other embodiments, event sorter  170  is a stand-alone module, or a part of another module stored in memory  102 , such as contact/motion module  130 . 
     In some embodiments, application  136 - 1  includes a plurality of event handlers  190  and one or more application views  191 , each of which includes instructions for handling touch events that occur within a respective view of the application&#39;s user interface. Each application view  191  of the application  136 - 1  includes one or more event recognizers  180 . Typically, a respective application view  191  includes a plurality of event recognizers  180 . In other embodiments, one or more of event recognizers  180  are part of a separate module, such as a user interface kit (not shown) or a higher level object from which application  136 - 1  inherits methods and other properties. In some embodiments, a respective event handler  190  includes one or more of: data updater  176 , object updater  177 , GUI updater  178 , and/or event data  179  received from event sorter  170 . Event handler  190  may utilize or call data updater  176 , object updater  177 , or GUI updater  178  to update the application internal state  192 . Alternatively, one or more of the application views  191  include one or more respective event handlers  190 . Also, in some embodiments, one or more of data updater  176 , object updater  177 , and GUI updater  178  are included in a respective application view  191 . 
     A respective event recognizer  180  receives event information (e.g., event data  179 ) from event sorter  170  and identifies an event from the event information. Event recognizer  180  includes event receiver  182  and event comparator  184 . In some embodiments, event recognizer  180  also includes at least a subset of: metadata  183 , and event delivery instructions  188  (which may include sub-event delivery instructions). 
     Event receiver  182  receives event information from event sorter  170 . The event information includes information about a sub-event, for example, a touch or a touch movement. Depending on the sub-event, the event information also includes additional information, such as location of the sub-event. When the sub-event concerns motion of a touch, the event information may also include speed and direction of the sub-event. In some embodiments, events include rotation of the device from one orientation to another (e.g., from a portrait orientation to a landscape orientation, or vice versa), and the event information includes corresponding information about the current orientation (also called device attitude) of the device. 
     Event comparator  184  compares the event information to predefined event or sub-event definitions and, based on the comparison, determines an event or sub-event, or determines or updates the state of an event or sub-event. In some embodiments, event comparator  184  includes event definitions  186 . Event definitions  186  contain definitions of events (e.g., predefined sequences of sub-events), for example, event  1  ( 187 - 1 ), event  2  ( 187 - 2 ), and others. In some embodiments, sub-events in an event ( 187 ) include, for example, touch begin, touch end, touch movement, touch cancellation, and multiple touching. In one example, the definition for event  1  ( 187 - 1 ) is a double tap on a displayed object. The double tap, for example, comprises a first touch (touch begin) on the displayed object for a predetermined phase, a first liftoff (touch end) for a predetermined phase, a second touch (touch begin) on the displayed object for a predetermined phase, and a second liftoff (touch end) for a predetermined phase. In another example, the definition for event  2  ( 187 - 2 ) is a dragging on a displayed object. The dragging, for example, comprises a touch (or contact) on the displayed object for a predetermined phase, a movement of the touch across touch-sensitive display  112 , and liftoff of the touch (touch end). In some embodiments, the event also includes information for one or more associated event handlers  190 . 
     In some embodiments, event definition  187  includes a definition of an event for a respective user-interface object. In some embodiments, event comparator  184  performs a hit test to determine which user-interface object is associated with a sub-event. For example, in an application view in which three user-interface objects are displayed on touch-sensitive display  112 , when a touch is detected on touch-sensitive display  112 , event comparator  184  performs a hit test to determine which of the three user-interface objects is associated with the touch (sub-event). If each displayed object is associated with a respective event handler  190 , the event comparator uses the result of the hit test to determine which event handler  190  should be activated. For example, event comparator  184  selects an event handler associated with the sub-event and the object triggering the hit test. 
     In some embodiments, the definition for a respective event ( 187 ) also includes delayed actions that delay delivery of the event information until after it has been determined whether the sequence of sub-events does or does not correspond to the event recognizer&#39;s event type. 
     When a respective event recognizer  180  determines that the series of sub-events do not match any of the events in event definitions  186 , the respective event recognizer  180  enters an event impossible, event failed, or event ended state, after which it disregards subsequent sub-events of the touch-based gesture. In this situation, other event recognizers, if any, that remain active for the hit view continue to track and process sub-events of an ongoing touch-based gesture. 
     In some embodiments, a respective event recognizer  180  includes metadata  183  with configurable properties, flags, and/or lists that indicate how the event delivery system should perform sub-event delivery to actively involved event recognizers. In some embodiments, metadata  183  includes configurable properties, flags, and/or lists that indicate how event recognizers may interact, or are enabled to interact, with one another. In some embodiments, metadata  183  includes configurable properties, flags, and/or lists that indicate whether sub-events are delivered to varying levels in the view or programmatic hierarchy. 
     In some embodiments, a respective event recognizer  180  activates event handler  190  associated with an event when one or more particular sub-events of an event are recognized. In some embodiments, a respective event recognizer  180  delivers event information associated with the event to event handler  190 . Activating an event handler  190  is distinct from sending (and deferred sending) sub-events to a respective hit view. In some embodiments, event recognizer  180  throws a flag associated with the recognized event, and event handler  190  associated with the flag catches the flag and performs a predefined process. 
     In some embodiments, event delivery instructions  188  include sub-event delivery instructions that deliver event information about a sub-event without activating an event handler. Instead, the sub-event delivery instructions deliver event information to event handlers associated with the series of sub-events or to actively involved views. Event handlers associated with the series of sub-events or with actively involved views receive the event information and perform a predetermined process. 
     In some embodiments, data updater  176  creates and updates data used in application  136 - 1 . For example, data updater  176  updates the telephone number used in contacts module  137 , or stores a video file used in video player module. In some embodiments, object updater  177  creates and updates objects used in application  136 - 1 . For example, object updater  177  creates a new user-interface object or updates the position of a user-interface object. GUI updater  178  updates the GUI. For example, GUI updater  178  prepares display information and sends it to graphics module  132  for display on a touch-sensitive display. 
     In some embodiments, event handler(s)  190  includes or has access to data updater  176 , object updater  177 , and GUI updater  178 . In some embodiments, data updater  176 , object updater  177 , and GUI updater  178  are included in a single module of a respective application  136 - 1  or application view  191 . In other embodiments, they are included in two or more software modules. 
     It shall be understood that the foregoing discussion regarding event handling of user touches on touch-sensitive displays also applies to other forms of user inputs to operate multifunction devices  100  with input devices, not all of which are initiated on touch screens. For example, mouse movement and mouse button presses, optionally coordinated with single or multiple keyboard presses or holds; contact movements such as taps, drags, scrolls, etc. on touchpads; pen stylus inputs; movement of the device; oral instructions; detected eye movements; biometric inputs; and/or any combination thereof are optionally utilized as inputs corresponding to sub-events which define an event to be recognized. 
       FIG. 2  illustrates a portable multifunction device  100  having a touch screen  112  in accordance with some embodiments. The touch screen optionally displays one or more graphics within user interface (UI)  200 . In this embodiment, as well as others described below, a user is enabled to select one or more of the graphics by making a gesture on the graphics, for example, with one or more fingers  202  (not drawn to scale in the figure) or one or more styluses  203  (not drawn to scale in the figure). In some embodiments, selection of one or more graphics occurs when the user breaks contact with the one or more graphics. In some embodiments, the gesture optionally includes one or more taps, one or more swipes (from left to right, right to left, upward and/or downward), and/or a rolling of a finger (from right to left, left to right, upward and/or downward) that has made contact with device  100 . In some implementations or circumstances, inadvertent contact with a graphic does not select the graphic. For example, a swipe gesture that sweeps over an application icon optionally does not select the corresponding application when the gesture corresponding to selection is a tap. 
     Device  100  may also include one or more physical buttons, such as “home” or menu button  204 . As described previously, menu button  204  may be used to navigate to any application  136  in a set of applications that may be executed on device  100 . Alternatively, in some embodiments, the menu button is implemented as a soft key in a GUI displayed on touch screen  112 . 
     In one embodiment, device  100  includes touch screen  112 , menu button  204 , push button  206  for powering the device on/off and locking the device, volume adjustment button(s)  208 , subscriber identity module (SIM) card slot  210 , headset jack  212 , and docking/charging external port  124 . Push button  206  is, optionally, used to turn the power on/off on the device by depressing the button and holding the button in the depressed state for a predefined time interval; to lock the device by depressing the button and releasing the button before the predefined time interval has elapsed; and/or to unlock the device or initiate an unlock process. In an alternative embodiment, device  100  also accepts verbal input for activation or deactivation of some functions through microphone  113 . Device  100  also, optionally, includes one or more contact intensity sensors  165  for detecting intensity of contacts on touch screen  112  and/or one or more tactile output generators  167  for generating tactile outputs for a user of device  100 . 
       FIG. 3  is a block diagram of an exemplary multifunction device with a display and a touch-sensitive surface in accordance with some embodiments. Device  300  need not be portable. In some embodiments, device  300  is a laptop computer, a desktop computer, a tablet computer, a multimedia player device, a navigation device, an educational device (such as a child&#39;s learning toy), a gaming system, or a control device (e.g., a home or industrial controller). Device  300  typically includes one or more processing units (CPUs)  310 , one or more network or other communications interfaces  360 , memory  370 , and one or more communication buses  320  for interconnecting these components. Communication buses  320  optionally include circuitry (sometimes called a chipset) that interconnects and controls communications between system components. Device  300  includes input/output (I/O) interface  330  comprising display  340 , which is typically a touch screen display. I/O interface  330  also optionally includes a keyboard and/or mouse (or other pointing device)  350  and touchpad  355 , tactile output generator  357  for generating tactile outputs on device  300  (e.g., similar to tactile output generator(s)  167  described above with reference to  FIG. 1A ), sensors  359  (e.g., optical, acceleration, proximity, touch-sensitive, and/or contact intensity sensors similar to contact intensity sensor(s)  165  described above with reference to  FIG. 1A ). Memory  370  includes high-speed random access memory, such as DRAM, SRAM, DDR RAM, or other random access solid state memory devices; and optionally includes non-volatile memory, such as one or more magnetic disk storage devices, optical disk storage devices, flash memory devices, or other non-volatile solid state storage devices. Memory  370  optionally includes one or more storage devices remotely located from CPU(s)  310 . In some embodiments, memory  370  stores programs, modules, and data structures analogous to the programs, modules, and data structures stored in memory  102  of portable multifunction device  100  ( FIG. 1A ), or a subset thereof. Furthermore, memory  370  optionally stores additional programs, modules, and data structures not present in memory  102  of portable multifunction device  100 . For example, memory  370  of device  300  optionally stores drawing module  380 , presentation module  382 , word processing module  384 , website creation module  386 , disk authoring module  388 , and/or spreadsheet module  390 , while memory  102  of portable multifunction device  100  ( FIG. 1A ) optionally does not store these modules. 
     Each of the above-identified elements in  FIG. 3  may be stored in one or more of the previously mentioned memory devices. Each of the above-identified modules corresponds to a set of instructions for performing a function described above. The above-identified modules or programs (e.g., sets of instructions) need not be implemented as separate software programs, procedures, or modules, and thus various subsets of these modules may be combined or otherwise rearranged in various embodiments. In some embodiments, memory  370  may store a subset of the modules and data structures identified above. Furthermore, memory  370  may store additional modules and data structures not described above. 
     Attention is now directed towards embodiments of user interfaces that may be implemented on, for example, portable multifunction device  100 . 
       FIG. 4A  illustrates an exemplary user interface for a menu of applications on portable multifunction device  100  in accordance with some embodiments. Similar user interfaces may be implemented on device  300 . In some embodiments, user interface  400  includes the following elements, or a subset or superset thereof:
         Signal strength indicator(s)  402  for wireless communication(s), such as cellular and Wi-Fi signals;   Time  404 ;   Bluetooth indicator  405 ;   Battery status indicator  406 ;   Tray  408  with icons for frequently used applications, such as:
           Icon  416  for telephone module  138 , labeled “Phone,” which optionally includes an indicator  414  of the number of missed calls or voicemail messages;   Icon  418  for e-mail client module  140 , labeled “Mail,” which optionally includes an indicator  410  of the number of unread e-mails;   Icon  420  for browser module  147 , labeled “Browser;” and   Icon  422  for video and music player module  152 , also referred to as iPod (trademark of Apple Inc.) module  152 , labeled “iPod;” and   
           Icons for other applications, such as:
           Icon  424  for IM module  141 , labeled “Messages;”   Icon  426  for calendar module  148 , labeled “Calendar;”   Icon  428  for image management module  144 , labeled “Photos;”   Icon  430  for camera module  143 , labeled “Camera;”   Icon  432  for online video module  155 , labeled “Online Video;”   Icon  434  for stocks widget  149 - 2 , labeled “Stocks;”   Icon  436  for map module  154 , labeled “Maps;”   Icon  438  for weather widget  149 - 1 , labeled “Weather;”   Icon  440  for alarm clock widget  149 - 4 , labeled “Clock;”   Icon  442  for workout support module  142 , labeled “Workout Support;”   Icon  444  for notes module  153 , labeled “Notes;” and   Icon  446  for a settings application or module, labeled “Settings,” which provides access to settings for device  100  and its various applications  136 .   
               

     It should be noted that the icon labels illustrated in  FIG. 4A  are merely exemplary. For example, icon  422  for video and music player module  152  may optionally be labeled “Music” or “Music Player.” Other labels are, optionally, used for various application icons. In some embodiments, a label for a respective application icon includes a name of an application corresponding to the respective application icon. In some embodiments, a label for a particular application icon is distinct from a name of an application corresponding to the particular application icon. 
       FIG. 4B  illustrates an exemplary user interface on a device (e.g., device  300 ,  FIG. 3 ) with a touch-sensitive surface  451  (e.g., a tablet or touchpad  355 ,  FIG. 3 ) that is separate from the display  450  (e.g., touch screen display  112 ). Device  300  also, optionally, includes one or more contact intensity sensors (e.g., one or more of sensors  357 ) for detecting intensity of contacts on touch-sensitive surface  451  and/or one or more tactile output generators  359  for generating tactile outputs for a user of device  300 . 
     Although some of the examples which follow will be given with reference to inputs on touch screen display  112  (where the touch-sensitive surface and the display are combined), in some embodiments, the device detects inputs on a touch-sensitive surface that is separate from the display, as shown in  FIG. 4B . In some embodiments, the touch-sensitive surface (e.g.,  451  in  FIG. 4B ) has a primary axis (e.g.,  452  in  FIG. 4B ) that corresponds to a primary axis (e.g.,  453  in  FIG. 4B ) on the display (e.g.,  450 ). In accordance with these embodiments, the device detects contacts (e.g.,  460  and  462  in  FIG. 4B ) with the touch-sensitive surface  451  at locations that correspond to respective locations on the display (e.g., in  FIG. 4B, 460  corresponds to  468  and  462  corresponds to  470 ). In this way, user inputs (e.g., contacts  460  and  462 , and movements thereof) detected by the device on the touch-sensitive surface (e.g.,  451  in  FIG. 4B ) are used by the device to manipulate the user interface on the display (e.g.,  450  in  FIG. 4B ) of the multifunction device when the touch-sensitive surface is separate from the display. It should be understood that similar methods are, optionally, used for other user interfaces described herein. 
     Additionally, while the following examples are given primarily with reference to finger inputs (e.g., finger contacts, finger tap gestures, finger swipe gestures), it should be understood that, in some embodiments, one or more of the finger inputs are replaced with input from another input device (e.g., a mouse-based input or stylus input). For example, a swipe gesture is, optionally, replaced with a mouse click (e.g., instead of a contact) followed by movement of the cursor along the path of the swipe (e.g., instead of movement of the contact). As another example, a tap gesture is, optionally, replaced with a mouse click while the cursor is located over the location of the tap gesture (e.g., instead of detection of the contact followed by ceasing to detect the contact). Similarly, when multiple user inputs are simultaneously detected, it should be understood that multiple computer mice are, optionally, used simultaneously, or a mouse and finger contacts are, optionally, used simultaneously. 
       FIG. 5A  illustrates exemplary personal electronic device  500 . Device  500  includes body  502 . In some embodiments, device  500  can include some or all of the features described with respect to devices  100  and  300  (e.g.,  FIGS. 1A-4B ). In some embodiments, device  500  has touch-sensitive display screen  504 , hereafter touch screen  504 . Alternatively, or in addition to touch screen  504 , device  500  has a display and a touch-sensitive surface. As with devices  100  and  300 , in some embodiments, touch screen  504  (or the touch-sensitive surface) may have one or more intensity sensors for detecting intensity of contacts (e.g., touches) being applied. The one or more intensity sensors of touch screen  504  (or the touch-sensitive surface) can provide output data that represents the intensity of touches. The user interface of device  500  can respond to touches based on their intensity, meaning that touches of different intensities can invoke different user interface operations on device  500 . 
     Techniques for detecting and processing touch intensity may be found, for example, in related applications: International Patent Application Serial No. PCT/US2013/040061, titled “Device, Method, and Graphical User Interface for Displaying User Interface Objects Corresponding to an Application,” filed May 8, 2013, and International Patent Application Serial No. PCT/US2013/069483, titled “Device, Method, and Graphical User Interface for Transitioning Between Touch Input to Display Output Relationships,” filed Nov. 11, 2013, each of which is hereby incorporated by reference in their entirety. 
     In some embodiments, device  500  has one or more input mechanisms  506  and  508 . Input mechanisms  506  and  508 , if included, can be physical. Examples of physical input mechanisms include push buttons and rotatable mechanisms. In some embodiments, device  500  has one or more attachment mechanisms. Such attachment mechanisms, if included, can permit attachment of device  500  with, for example, hats, eyewear, earrings, necklaces, shirts, jackets, bracelets, watch straps, chains, trousers, belts, shoes, purses, backpacks, and so forth. These attachment mechanisms may permit device  500  to be worn by a user. 
       FIG. 5B  depicts exemplary personal electronic device  500 . In some embodiments, device  500  can include some or all of the components described with respect to  FIGS. 1A, 1B, and 3 . Device  500  has bus  512  that operatively couples I/O section  514  with one or more computer processors  516  and memory  518 . I/O section  514  can be connected to display  504 , which can have touch-sensitive component  522  and, optionally, touch-intensity sensitive component  524 . In addition, I/O section  514  can be connected with communication unit  530  for receiving application and operating system data, using Wi-Fi, Bluetooth, near field communication (NFC), cellular, and/or other wireless communication techniques. Device  500  can include input mechanisms  506  and/or  508 . Input mechanism  506  may be a rotatable input device or a depressible and rotatable input device, for example. Input mechanism  508  may be a button, in some examples. 
     Input mechanism  508  may be a microphone, in some examples. Personal electronic device  500  can include various sensors, such as GPS sensor  532 , accelerometer  534 , directional sensor  540  (e.g., compass), gyroscope  536 , motion sensor  538 , and/or a combination thereof, all of which can be operatively connected to I/O section  514 . 
     Memory  518  of personal electronic device  500  can be a non-transitory computer-readable storage medium, for storing computer-executable instructions, which, when executed by one or more computer processors  516 , for example, can cause the computer processors to perform the techniques described above, including processes  2200 - 2600  ( FIGS. 22-26 ). The computer-executable instructions can also be stored and/or transported within any non-transitory computer-readable storage medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For purposes of this document, a “non-transitory computer-readable storage medium” can be any medium that can tangibly contain or store computer-executable instructions for use by or in connection with the instruction execution system, apparatus, or device. The non-transitory computer-readable storage medium can include, but is not limited to, magnetic, optical, and/or semiconductor storages. Examples of such storage include magnetic disks, optical discs based on CD, DVD, or Blu-ray technologies, as well as persistent solid-state memory such as flash, solid-state drives, and the like. Personal electronic device  500  is not limited to the components and configuration of  FIG. 5B , but can include other or additional components in multiple configurations. 
     As used here, the term “affordance” refers to a user-interactive graphical user interface object that may be displayed on the display screen of devices  100 ,  300 , and/or  500  ( FIGS. 1, 3, and 5 ). For example, an image (e.g., icon), a button, and text (e.g., hyperlink) may each constitute an affordance. 
     As used herein, the term “focus selector” refers to an input element that indicates a current part of a user interface with which a user is interacting. In some implementations that include a cursor or other location marker, the cursor acts as a “focus selector” so that when an input (e.g., a press input) is detected on a touch-sensitive surface (e.g., touchpad  355  in  FIG. 3  or touch-sensitive surface  451  in  FIG. 4B ) while the cursor is over a particular user interface element (e.g., a button, window, slider or other user interface element), the particular user interface element is adjusted in accordance with the detected input. In some implementations that include a touch screen display (e.g., touch-sensitive display system  112  in  FIG. 1A  or touch screen  112  in  FIG. 4A ) that enables direct interaction with user interface elements on the touch screen display, a detected contact on the touch screen acts as a “focus selector” so that when an input (e.g., a press input by the contact) is detected on the touch screen display at a location of a particular user interface element (e.g., a button, window, slider, or other user interface element), the particular user interface element is adjusted in accordance with the detected input. In some implementations, focus is moved from one region of a user interface to another region of the user interface without corresponding movement of a cursor or movement of a contact on a touch screen display (e.g., by using a tab key or arrow keys to move focus from one button to another button); in these implementations, the focus selector moves in accordance with movement of focus between different regions of the user interface. Without regard to the specific form taken by the focus selector, the focus selector is generally the user interface element (or contact on a touch screen display) that is controlled by the user so as to communicate the user&#39;s intended interaction with the user interface (e.g., by indicating, to the device, the element of the user interface with which the user is intending to interact). For example, the location of a focus selector (e.g., a cursor, a contact, or a selection box) over a respective button while a press input is detected on the touch-sensitive surface (e.g., a touchpad or touch screen) will indicate that the user is intending to activate the respective button (as opposed to other user interface elements shown on a display of the device). 
     As used in the specification and claims, the term “characteristic intensity” of a contact refers to a characteristic of the contact based on one or more intensities of the contact. In some embodiments, the characteristic intensity is based on multiple intensity samples. The characteristic intensity is, optionally, based on a predefined number of intensity samples, or a set of intensity samples collected during a predetermined time period (e.g., 0.05, 0.1, 0.2, 0.5, 1, 2, 5, 10 seconds) relative to a predefined event (e.g., after detecting the contact, prior to detecting liftoff of the contact, before or after detecting a start of movement of the contact, prior to detecting an end of the contact, before or after detecting an increase in intensity of the contact, and/or before or after detecting a decrease in intensity of the contact). A characteristic intensity of a contact is, optionally based on one or more of: a maximum value of the intensities of the contact, a mean value of the intensities of the contact, an average value of the intensities of the contact, a top 10 percentile value of the intensities of the contact, a value at the half maximum of the intensities of the contact, a value at the 90 percent maximum of the intensities of the contact, or the like. In some embodiments, the duration of the contact is used in determining the characteristic intensity (e.g., when the characteristic intensity is an average of the intensity of the contact over time). In some embodiments, the characteristic intensity is compared to a set of one or more intensity thresholds to determine whether an operation has been performed by a user. For example, the set of one or more intensity thresholds may include a first intensity threshold and a second intensity threshold. In this example, a contact with a characteristic intensity that does not exceed the first threshold results in a first operation, a contact with a characteristic intensity that exceeds the first intensity threshold and does not exceed the second intensity threshold results in a second operation, and a contact with a characteristic intensity that exceeds the second threshold results in a third operation. In some embodiments, a comparison between the characteristic intensity and one or more thresholds is used to determine whether or not to perform one or more operations (e.g., whether to perform a respective operation or forgo performing the respective operation) rather than being used to determine whether to perform a first operation or a second operation. 
       FIG. 5C  illustrates detecting a plurality of contacts  552 A- 552 E on touch-sensitive display screen  504  with a plurality of intensity sensors  524 A- 524 D.  FIG. 5C  additionally includes intensity diagrams that show the current intensity measurements of the intensity sensors  524 A- 524 D relative to units of intensity. In this example, the intensity measurements of intensity sensors  524 A and  524 D are each 9 units of intensity, and the intensity measurements of intensity sensors  524 B and  524 C are each 7 units of intensity. In some implementations, an aggregate intensity is the sum of the intensity measurements of the plurality of intensity sensors  524 A- 524 D, which in this example is 32 intensity units. In some embodiments, each contact is assigned a respective intensity that is a portion of the aggregate intensity.  FIG. 5D  illustrates assigning the aggregate intensity to contacts  552 A- 552 E based on their distance from the center of force  554 . In this example, each of contacts  552 A,  552 B and  552 E are assigned an intensity of contact of 8 intensity units of the aggregate intensity, and each of contacts  552 C and  552 D are assigned an intensity of contact of 4 intensity units of the aggregate intensity. More generally, in some implementations, each contact j is assigned a respective intensity Ij that is a portion of the aggregate intensity, A, in accordance with a predefined mathematical function, Ij=A·(Dj/ΣDi), where Dj is the distance of the respective contact j to the center of force, and ΣDi is the sum of the distances of all the respective contacts (e.g., i=1 to last) to the center of force. The operations described with reference to  FIGS. 5C-5D  can be performed using an electronic device similar or identical to device  100 ,  300 , or  500 . In some embodiments, a characteristic intensity of a contact is based on one or more intensities of the contact. In some embodiments, the intensity sensors are used to determine a single characteristic intensity (e.g., a single characteristic intensity of a single contact). It should be noted that the intensity diagrams are not part of a displayed user interface, but are included in  FIGS. 5C-5D  to aid the reader. 
     In some embodiments, a portion of a gesture is identified for purposes of determining a characteristic intensity. For example, a touch-sensitive surface may receive a continuous swipe contact transitioning from a start location and reaching an end location, at which point the intensity of the contact increases. In this example, the characteristic intensity of the contact at the end location may be based on only a portion of the continuous swipe contact, and not the entire swipe contact (e.g., only the portion of the swipe contact at the end location). In some embodiments, a smoothing algorithm may be applied to the intensities of the swipe contact prior to determining the characteristic intensity of the contact. For example, the smoothing algorithm optionally includes one or more of: an unweighted sliding-average smoothing algorithm, a triangular smoothing algorithm, a median filter smoothing algorithm, and/or an exponential smoothing algorithm. In some circumstances, these smoothing algorithms eliminate narrow spikes or dips in the intensities of the swipe contact for purposes of determining a characteristic intensity. 
     The intensity of a contact on the touch-sensitive surface may be characterized relative to one or more intensity thresholds, such as a contact-detection intensity threshold, a light press intensity threshold, a deep press intensity threshold, and/or one or more other intensity thresholds. In some embodiments, the light press intensity threshold corresponds to an intensity at which the device will perform operations typically associated with clicking a button of a physical mouse or a trackpad. In some embodiments, the deep press intensity threshold corresponds to an intensity at which the device will perform operations that are different from operations typically associated with clicking a button of a physical mouse or a trackpad. In some embodiments, when a contact is detected with a characteristic intensity below the light press intensity threshold (e.g., and above a nominal contact-detection intensity threshold below which the contact is no longer detected), the device will move a focus selector in accordance with movement of the contact on the touch-sensitive surface without performing an operation associated with the light press intensity threshold or the deep press intensity threshold. Generally, unless otherwise stated, these intensity thresholds are consistent between different sets of user interface figures. 
     An increase of characteristic intensity of the contact from an intensity below the light press intensity threshold to an intensity between the light press intensity threshold and the deep press intensity threshold is sometimes referred to as a “light press” input. An increase of characteristic intensity of the contact from an intensity below the deep press intensity threshold to an intensity above the deep press intensity threshold is sometimes referred to as a “deep press” input. An increase of characteristic intensity of the contact from an intensity below the contact-detection intensity threshold to an intensity between the contact-detection intensity threshold and the light press intensity threshold is sometimes referred to as detecting the contact on the touch-surface. A decrease of characteristic intensity of the contact from an intensity above the contact-detection intensity threshold to an intensity below the contact-detection intensity threshold is sometimes referred to as detecting liftoff of the contact from the touch-surface. In some embodiments, the contact-detection intensity threshold is zero. In some embodiments, the contact-detection intensity threshold is greater than zero. 
     In some embodiments described herein, one or more operations are performed in response to detecting a gesture that includes a respective press input or in response to detecting the respective press input performed with a respective contact (or a plurality of contacts), where the respective press input is detected based at least in part on detecting an increase in intensity of the contact (or plurality of contacts) above a press-input intensity threshold. In some embodiments, the respective operation is performed in response to detecting the increase in intensity of the respective contact above the press-input intensity threshold (e.g., a “down stroke” of the respective press input). In some embodiments, the press input includes an increase in intensity of the respective contact above the press-input intensity threshold and a subsequent decrease in intensity of the contact below the press-input intensity threshold, and the respective operation is performed in response to detecting the subsequent decrease in intensity of the respective contact below the press-input threshold (e.g., an “up stroke” of the respective press input). 
       FIGS. 5E-5H  illustrate detection of a gesture that includes a press input that corresponds to an increase in intensity of a contact  562  from an intensity below a light press intensity threshold (e.g., “ITL”) in  FIG. 5E , to an intensity above a deep press intensity threshold (e.g., “ITD”) in  FIG. 5H . The gesture performed with contact  562  is detected on touch-sensitive surface  560  while cursor  576  is displayed over application icon  572 B corresponding to App  2 , on a displayed user interface  570  that includes application icons  572 A- 572 D displayed in predefined region  574 . In some embodiments, the gesture is detected on touch-sensitive display  504 . The intensity sensors detect the intensity of contacts on touch-sensitive surface  560 . The device determines that the intensity of contact  562  peaked above the deep press intensity threshold (e.g., “ITD”). Contact  562  is maintained on touch-sensitive surface  560 . In response to the detection of the gesture, and in accordance with contact  562  having an intensity that goes above the deep press intensity threshold (e.g., “ITD”) during the gesture, reduced-scale representations  578 A- 578 C (e.g., thumbnails) of recently opened documents for App  2  are displayed, as shown in  FIGS. 5F-5H . In some embodiments, the intensity, which is compared to the one or more intensity thresholds, is the characteristic intensity of a contact. It should be noted that the intensity diagram for contact  562  is not part of a displayed user interface, but is included in  FIGS. 5E-5H  to aid the reader. 
     In some embodiments, the display of representations  578 A- 578 C includes an animation. For example, representation  578 A is initially displayed in proximity of application icon  572 B, as shown in  FIG. 5F . As the animation proceeds, representation  578 A moves upward and representation  578 B is displayed in proximity of application icon  572 B, as shown in  FIG. 5G . Then representations  578 A moves upward,  578 B moves upward toward representation  578 A, and representation  578 C is displayed in proximity of application icon  572 B, as shown in  FIG. 5H . Representations  578 A- 578 C form an array above icon  572 B. In some embodiments, the animation progresses in accordance with an intensity of contact  562 , as shown in  FIGS. 5F-5G , where the representations  578 A- 578 C appear and move upwards as the intensity of contact  562  increases toward the deep press intensity threshold (e.g., “ITD”). In some embodiments the intensity, on which the progress of the animation is based, is the characteristic intensity of the contact. The operations described with reference to  FIGS. 5E-5H  can be performed using an electronic device similar or identical to device  100 ,  300 , or  500 . 
     In some embodiments, the device employs intensity hysteresis to avoid accidental inputs sometimes termed “jitter,” where the device defines or selects a hysteresis intensity threshold with a predefined relationship to the press-input intensity threshold (e.g., the hysteresis intensity threshold is X intensity units lower than the press-input intensity threshold or the hysteresis intensity threshold is 75%, 90%, or some reasonable proportion of the press-input intensity threshold). Thus, in some embodiments, the press input includes an increase in intensity of the respective contact above the press-input intensity threshold and a subsequent decrease in intensity of the contact below the hysteresis intensity threshold that corresponds to the press-input intensity threshold, and the respective operation is performed in response to detecting the subsequent decrease in intensity of the respective contact below the hysteresis intensity threshold (e.g., an “up stroke” of the respective press input). Similarly, in some embodiments, the press input is detected only when the device detects an increase in intensity of the contact from an intensity at or below the hysteresis intensity threshold to an intensity at or above the press-input intensity threshold and, optionally, a subsequent decrease in intensity of the contact to an intensity at or below the hysteresis intensity, and the respective operation is performed in response to detecting the press input (e.g., the increase in intensity of the contact or the decrease in intensity of the contact, depending on the circumstances). 
     For ease of explanation, the descriptions of operations performed in response to a press input associated with a press-input intensity threshold or in response to a gesture including the press input are, optionally, triggered in response to detecting either: an increase in intensity of a contact above the press-input intensity threshold, an increase in intensity of a contact from an intensity below the hysteresis intensity threshold to an intensity above the press-input intensity threshold, a decrease in intensity of the contact below the press-input intensity threshold, and/or a decrease in intensity of the contact below the hysteresis intensity threshold corresponding to the press-input intensity threshold. Additionally, in examples where an operation is described as being performed in response to detecting a decrease in intensity of a contact below the press-input intensity threshold, the operation is, optionally, performed in response to detecting a decrease in intensity of the contact below a hysteresis intensity threshold corresponding to, and lower than, the press-input intensity threshold. 
     Attention is now directed to user interfaces and associated processes that may be implemented on a multifunction device with a display and a touch-sensitive surface, such as devices  100 ,  300 , and/or  500  ( FIGS. 1A, 3A , and/or  5 A), to provide functionalities of a photos application. 
       FIG. 6A  illustrates exemplary electronic device  600 . Device  600  may be device  500  ( FIG. 5A ) in some embodiments. In the illustrated example, device  600  is a wearable electronic device. As shown, device  600  may display user interface  610  having user interface objects  620 - 624 . On user interface  610 , user interface objects  620 - 624  are displayed as icons. Icons  620 - 624  may correspond to applications executable on device  600 , meaning device  600  may launch a corresponding applications in response to a user&#39;s selection of an icon. In the illustrated example, icon  620  corresponds to a photos application. 
     A photos application may provide the capability to display photos and/or collections of photos (or representations thereof) on the display of device  600 . A collection of photos may include a set of one or more photos that are associated in some way. For example, a collection of photos may share a common memory location (e.g., drive, directory, folder, album, etc.) or metadata associating the photos with a common event, day, time, location, etc. In some embodiments, a collection of photos includes a set of photos that have been designated by a user. 
     Photos may be stored in the form of digital images on an electronic device. In some embodiments, a photos application accesses photos stored in memory on device  600 . In some embodiments, a photos application receives and/or accesses photos stored in memory on an external device. An external device may include a smartphone, desktop computer, laptop computer, network server, webserver, or the like. 
     A photos application may also provide the capability to select a collection of photos (e.g., an album) to display, change the selected collection of photos, display a photo or collection of photos, browse through a collection of photos, display a preview of a photo, share photos or collections of photos, post a comment on and/or like photos or collections of photos (e.g., on a social media website), set a photo as a wallpaper or background of a user interface, add metadata to a photo and/or collection of photos, etc. Exemplary techniques and user interfaces for performing various capabilities, including but not limited to those listed above, are described in greater detail below. 
     Notably, the availability of rotatable input mechanism  602  on device  600  may improve the speed of man-machine interactions. For example, as described in greater detail below, a user may rotate the input mechanism  602  to quickly “flip” through the photos in a collection or zoom in/zoom out on a displayed image. In this way, device  600  may reduce (and in some instances eliminate) the need for touch-based gestures in navigating through a collection of photos Importantly, this combination of the available software user interface and hardware input mechanism permit efficient browsing of photos. 
     Although many of the exemplary user interfaces and techniques provided in this disclosure are described with respect to photos, it should be recognized that certain aspects may be applied to various types of media including, for example, image files, video files, audio files, sequences of images (e.g., stored as a single file), animated Graphics Interchange Format (GIF) files. For example, a photos application or other multimedia application may provide the capability to display a combination of photos, videos, sequences of images, animated GIF files, and/or collections thereof. 
     Turning to  FIG. 6B , an exemplary external device  650  is described. Device  650  may be device  100  or  300  ( FIG. 1A or 3A ) in some embodiments. In the illustrated example, external device  650  is a phone. External device  650  may have photos, videos, sequences of images, or other media stored in local memory. External device  650  may also be capable of accessing photos or other media stored on another external device (e.g., a cloud server). The photos or other media may be organized into folders, directories, albums, or the like, that contain collections of photos. In some embodiments, external device  650  stores and/or accesses a collection of designated photo.  FIG. 6B  shows an exemplary user interface  660  that may be displayed by external device  650 . User interface  660  includes an icon  670  representing a folder containing a collection of designated photos stored in local memory and/or the memory of another external device to which external device  650  has access. 
     In some embodiments, device  650  transmits data representing photos or other media stored on an external device. Device  600  may receive the transmitted data to display images of the photos on the display of device  600 . In some embodiments, devices  600  and  650  are paired. As used herein, pairing two electronic devices includes establishing a means of communication between the two devices. The means of communication may include those described in U.S. Patent Application Ser. No. 62/005,751, “Predefined Wireless Pairing,” filed May 30, 2014. Once the devices are paired, they may exchange data, including photo images and information associated with the photos (e.g., metadata). When device  600  is paired with external device  650 , device  600  may be able to receive via wireless communication data representing the designated photos included in folder  670 . 
     Attention is now directed to techniques and user interfaces for displaying photos on device  600 .  FIGS. 7A-7D  illustrate exemplary user interfaces for displaying photos or other media on device  600 .  FIG. 7A  shows an exemplary user interaction  700  with the photos application icon  620  displayed on exemplary user interface  610 , which was described previously with reference to  FIG. 6A . As shown in  FIG. 7A , the user interaction  700  is a tap. In some embodiments, the user interaction includes another type of touch-based gesture (e.g., tap and hold, swipe, flick, etc.). In some embodiments, the user interaction includes a movement of a mechanical input mechanism (e.g., a press or rotation of rotatable input mechanism  602 ). 
     Device  600  may detect tap  700  and, in response, launch the photos application associated with icon  620 . Upon launching, the photos application may causes device  600  to receive data representing a collection of photos or other media. The data may represent a collection of photos (e.g., designated photos) stored on an external device. Device  600  may receive the data via wireless communication. 
     Upon launching, the photos application may also cause device  600  to replace the display of user interface  610  with a display of a photo or other media from the received collection of photos. The display of the photo or other media may include, for example, a digital image of a photo, a digital representation of a photo (e.g., a thumbnail image), a digital representation of a sequence of images (e.g., a representative image of the sequence of images), or the like.  FIG. 7B  shows exemplary user interface  710 , which includes a display of an image of a photo from the collection of photos. For purposes of simplicity, text (e.g., “PHOTO A”) is used to represent an actual digital image of the indicated photo. Also, it should be recognized that a photo in the examples that follow could alternatively be a video, a sequence of images, or other media. 
     The collection of photos received by device  600  may include one or more photos. In some embodiments, another photo in the collection is displayed in response to detecting a user interaction.  FIG. 7B  indicates a user interaction  701  by an arrow above the rotational input mechanism  602 . In the illustrated example, user interaction  701  is a movement (e.g., rotation) of rotational input mechanism  602 . Movement of rotational input mechanism  602  may cause device  600  to replace the display of PHOTO A with a display of another photo. For example, device  600  may detect user interaction  701  and, in response, replace the display of PHOTO A with a display of another photo in the received collection of photos. 
     In some embodiments, the photos in a collection are associated with a sequence (e.g., PHOTO A, PHOTO B, PHOTO C, etc.). Upon launching a photos application, device  600  may display the first photo in the sequence (e.g., PHOTO A). Furthermore, in  FIG. 7B , the single arrow above rotational input mechanism  602  indicates that user interaction  701  represents a single unit of movement of rotational input mechanism  602 . In response to a single unit of movement, device  600  may display a photo in the sequence adjacent to the photo currently displayed. For example, in response to a clockwise rotation of the rotational input mechanism  602 , device  600  may display a subsequent photo in the sequence.  FIG. 7C  shows an exemplary user interface  711  on device  600  with the next photo in the sequence, PHOTO B, displayed as a result of user interaction  701  of rotational input mechanism  602 . In some embodiments, a counter-clockwise rotation of the rotational input mechanism  602  causes device  600  to display a previous photo in the sequence. For example, a single-unit, counter-clockwise rotation of the rotational input mechanism  602  while photo B is displayed may cause device  600  to re-display photo A. Alternatively, in response to a clockwise rotation of the rotational input mechanism  602 , device  600  may display a previous photo in the sequence. And in response to a counter-clockwise rotation of the rotational input mechanism  602 , device  600  may display a subsequent photo in the sequence. 
     Turning again to  FIG. 7C , another movement  702  of rotational input mechanism  602  is illustrated by the three arrows above rotational input mechanism  602 . Movement  702  represents three units of rotation of rotational input mechanism  602  which may cause device  600  to replace the currently displayed photo (PHOTO B) with a photo three positions away in the sequence.  FIG. 7D  shows an exemplary user interface  712  on device  600  with a photo three positions away from photo B (i.e., PHOTO E) displayed in place of PHOTO B as a result of movement  702  of rotational input mechanism  602 . 
     In some embodiments, a user causes device  600  to change a displayed photo using a touch-based gesture on the touch-sensitive display.  FIG. 8A  shows exemplary user interface  810  displayed on device  600 , which includes a display of a photo A. In  FIG. 8A , the horizontal arrow next to the depicted finger indicates a user interaction  800 . In the illustrated example, the user interaction  800  is a single swipe gesture on the touch-sensitive display. Swipe  800  may cause device  600  to replace the display of PHOTO A with a display of a different photo. That is, device  600  may detect swipe  800  and, in response, replace the display of photo A with a display of another photo in the collection of designated photos. 
     In some embodiments, a single swipe causes device  600  to display a photo adjacent to the photo currently displayed based on the sequence of photos. For example, in response to a swipe from right to left, device  600  may display a subsequent photo in the sequence.  FIG. 8B  shows an exemplary user interface  811  on device  600  with the next photo in the sequence, PHOTO B, displayed as a result of swipe  800 . In some embodiments, a swipe from left to right causes device  600  to display a previous photo in the sequence. For example, a single swipe from left to right while photo B is displayed may cause device  600  to re-display photo A. In some embodiments, a swipe from bottom to top causes device  600  to display a subsequent photo in the sequence. And a swipe from top to bottom may cause device  600  to display a previous photo in the sequence. 
     Turning again to  FIG. 8B , another touch-based gesture  801  is illustrated by three horizontal arrows. Touch-based gesture  801  represents three swipes from right to left on the touch-sensitive display of device  600 . Detection of the three swipes  801  may cause device  600  to replace the currently displayed photo (PHOTO B) with a photo three positions away in the sequence.  FIG. 8C  shows an exemplary user interface  812  on device  600  with a photo three positions away from photo B (i.e., PHOTO E) displayed in place of PHOTO B as a result of user interaction  801 . 
     Attention is now directed to techniques for displaying a transition between photos (e.g., replacing a display of a photo with a display of another photo). In some embodiments, a transition includes an animation.  FIGS. 9A-9C  depict exemplary user interfaces  901 - 903  animating a transition from a full-size display of a photo A ( FIG. 9A ) to a full-size display of a photo B ( FIG. 9C ).  FIG. 9B  shows an intermediate user interface  902  that illustrates the exemplary animation. In user interface  902 , PHOTO A is translated upward off of the display to reveal a display of PHOTO B. In some embodiments, PHOTO A is translated right, left, down, or diagonally. The initial display of PHOTO B may be centered on the display and is displayed as a smaller, reduced-size image than the larger full-size images displayed on user interfaces  901  and  903 . The display of PHOTO B may then be animated to enlarge PHOTO B from the reduced-size to the larger full-size. This animation may create the appearance that PHOTO B is being zoomed in along an axis normal to the display of device  600  (e.g., a z-axis). 
       FIGS. 9D-9F  depict user interfaces  910 - 912 , which illustrate an alternative animation for transitioning from the display of one photo to another. As shown in intermediate user interface  911 , the display of PHOTO A is translated upward off of the display to reveal a full-sized display of PHOTO B. In this case, the animation may provide the appearance of flipping through a deck of cards or a physical stack of photos. 
     Attention is now directed to techniques and user interfaces related to selecting a collection of photos and displaying photos from the selected collection. 
       FIG. 10A  shows an exemplary user interface  1000  that may be displayed on external device  650 . User interface  1000  includes user interface objects  1001 - 1004  corresponding to collections of photos stored on an external device, which are referred to as Albums  1 - 4 , respectively. In some embodiments, the photos are stored in local memory of external device  650  and/or the memory of another external device to which external device  650  has access. External device  650  may transmit via wireless communication data representing Albums  1 - 4  and their respective photos. 
     In some embodiments, device  600  receives (e.g., via wireless communication) the data transmitted by external device  650  and is capable of displaying the albums and photos represented by the data.  FIG. 10B  shows an exemplary user interaction  1005  that may cause device  600  to launch a photos application associated with icon  620  as described previously with reference to  FIGS. 6A and 7A . As shown in  FIG. 10B , the user interaction  1005  is a tap. 
     Upon launching, the photos application may causes device  600  to receive the data transmitted by external device  650 . The photos application may also cause device  600  to replace the display of user interface  610  with a display of a user interface including user interface objects that represent the collections of photos of the received data. 
       FIG. 10C  shows an exemplary user interface  1010  including user interface objects  1011 - 1014  representing the collections of photos on external device  650 , Albums  1 - 4 . In user interface  1010 , the interface objects  1011 - 1014  are displayed as folders.  FIG. 10D  shows an alternative exemplary user interface  1020  with user interface objects representing Albums  1 - 4 . 
     In some embodiments, a user can select one of the collections of photos by selecting the user interface object corresponding to a desired collection.  FIG. 11A  depicts an exemplary user interaction  1100  with user interface  1010  described above with reference to  FIG. 10C . In  FIG. 11A , user interaction  1100  is depicted as a tap on folder  1013  corresponding to Album  3 . 
     In some embodiments, device  600  detects the user interaction  1100  with user interface object  1013  and, in response, replaces user interface  1010  with a display of a photo in Album  3 .  FIG. 11B  shows an exemplary user interface  1110  including a display of a photo from Album  3 , PHOTO  3 A. 
     In some embodiments, device  600  detects the user interaction  1100  with user interface object  1013  and, in response, replaces user interface  1010  with a display of a user interface that includes a user interface object (e.g., an image) representing the selected collection of photos (e.g., the photos in Album  3 ). 
     In some embodiments, the user interface object representing the selected collection of photos includes a cover image. That is, in response to detecting a user interaction with user interface object  1013 , device  600  may replace the display of user interface  1010  with a user interface including a cover image indicative of Album  3 .  FIG. 11C  depicts an exemplary user interface  1120  including a cover image indicative of Album  3 . 
     In some embodiments, the user interface object representing the selected collection of photos includes a composite image. That is, in response to detecting a user interaction with user interface object  1013 , device  600  may replace the display of user interface  1010  with a display of a composite image indicative of the photos in Album  3 . 
       FIG. 11D  depicts an exemplary user interface  1130  including a display of a view  1140  of an exemplary composite image  1150 . Composite image  1150  depicted in  FIG. 11D  is representative of the collection of photos in Album  3 , and comprises representations associated with individual photos in the album. For example, composite image  1150  includes representation  1151  associated with photo E in Album  3 , as indicated by the reference  3 E′. A representation may include an indication (e.g., a label) and/or a visual representation (e.g., a thumbnail image) of the corresponding photo. The representations may be arranged in a rectilinear grid as depicted in exemplary composite image  1150 , and may resemble a mosaic image comprising the individual photos in a collection. 
     In some embodiments, the representations are arranged in fixed positions with respect to each other. That is, the representations may maintain their positions with respect to each other despite operations otherwise affecting the view of the composite image, such as translation and scaling (e.g., zooming in and zooming out). In  FIG. 11D  for example, representation  3 L′ may be fixed adjacent to the left of representation  3 M′, which is fixed to the upper left of representation  3 S′. 
     User interface  1130  includes a view  1140  of composite image  1150  in the sense that user interface  1130  may display the entire image  1150  or only a portion thereof (i.e., less than the entire image). For example, view  1140  shows representations of 25 photos (photos  3 A- 3 Y). However, if Album  3  includes more than 25 photos, composite image  1150  may include additional representations that are not shown in view  1140 . In some embodiments, portions of the composite image extends beyond the top, bottom, and/or sides of the display and be hidden from view. 
     In some embodiments, a drag or swipe gesture on a display of a composite image causes device  600  to translate the image and display a hidden portion. For example, if an image extends beyond the bottom of the displayed view, a movement of a contact from the bottom of the display towards the top of the display may cause device  600  to translate the composite image upward revealing a previously hidden lower portion (e.g., previously hidden representations) of the image. 
     In some embodiments, device  600  incorporates a “rubberband” feature when the edge of an image is reached while translating the image. That is, in response to an edge of the image being reached while translating the image in an initial direction while the contact is still detected on the touch screen display, device  600  may display an area beyond the edge of the image and display a reduced portion of the image. Device  600  may also detect that the contact is no longer on the touch screen display. In response to detecting that the contact is no longer on the touch screen display, device  600  may translate the image in a direction opposite the initial direction until the area beyond the edge of the image is no longer displayed and display a portion of the image that is different from the initially displayed view. 
     Described in another way, device  600  may detect a movement of a physical object on or near the touch screen display (e.g., a swipe gesture performed with one or more contacts). While detecting the movement, device  600  may translate the image displayed on the touch screen display in an initial direction to display a previously hidden edge of the image. In response to display of the previously hidden edge of the image and continued detection of the movement, device  600  may display an area beyond the edge of the image. After the movement is no longer detected (e.g., in response to detecting liftoff of the one or more contacts from the touch screen display), device  600  may translate the image in another direction until the area beyond the edge of the image is no longer displayed. 
     It should also be recognized that although the displayed view  1140  of image  1150  in  FIG. 11D  includes only entire photo representations, a view may be cut off at one or more edge such that only part of the representations along the cut off edges are displayed. Also, a view may include any number of rows and/or columns of representations (e.g., 7×7, 10×10, or 7×10). 
     Turning now to  FIGS. 12A-12B , an exemplary technique for selecting a photo by interacting with a composite image is described.  FIGS. 12A-12B  illustrate a selection of a photo on device  600  from a composite image comprising a plurality of representations associated with photos.  FIG. 12A  shows user interface  1200  including view  1210  of composite image  1220 . Image  1220  includes a representation  1221  associated with a photo S. 
     The representation  1221  may include an affordance that allows the user to interact with the image  1220  via the representation. In some embodiments, device  600  detects a user interaction (e.g., a user touch detected as a contact on the touch-sensitive display) and determines whether it represents a selection of an affordance corresponding to a representation in the composite image. In response to a determination that the user interaction represents a selection of an affordance associated with a representation of a photo, device  600  may replace the display of the composite image with a display of the corresponding photo. 
       FIG. 12A  depicts a user interaction  1205  in the form of a tap gesture at representation  1221 . Device  600  may detect user interaction  1205 , determine that it represents a selection of an affordance of representation  1221 , and in response, replace the display of composite image  1220  (or the view  1210  of composite image  1220 ) with a display of photo S, as depicted by user interface  1230  in  FIG. 12B . 
     In some embodiments, device  600  has a small form factor. Due to its size, device  600  may not lend itself to displaying large numbers of highly detailed (e.g., high resolution) graphical user interface elements (e.g., representations of photos). If a large number of representations are displayed in a view of the composite image, the size of the representations may be relatively small, which may make viewing difficult. The small size may also make it difficult to reliably select (e.g., via a touch-based gesture) the representation of an intended photo. It may therefore be desirable to provide techniques that allow a user to zoom in on the view of the image to increase the displayed size and/or resolution of the representations. 
     In some embodiments, a view of a composite image displayed on device  600  can be zoomed by moving rotatable input mechanism  602 .  FIG. 13A  shows an exemplary user interface  1300  including view  1310  of composite image  1320 . Composite image  1320  includes representations of photos arranged in a rectilinear grid pattern. A movement  1305  (e.g., rotation) of the rotatable input mechanism  602  is represented by an arrow above rotatable input mechanism  602 . Device  600  may detect movement  1305  and, in response, transition the display of view  1310  of image  1320  to a zoomed-in view in which the representations of image  1320  are displayed at a larger size.  FIG. 13B  shows an exemplary user interface  1330  including a zoomed in view  1340  of image  1320 . View  1340  is zoomed such that the portion of the composite image  1320  at the center of the zoomed out view  1310  is also at the center of the zoomed-in view  1340 . 
     In  FIGS. 13A-13B , user interaction  1305  causes device  600  to transition the display from a view with five rows and five columns (i e, a 5×5 view) to a 3×3 view with fewer representations displayed at a larger size and in greater detail (resolution). It should be recognized that device  600  may zoom in by transitioning from a view of any size grid to a view of any smaller sized grid with the same row-to-column ratio (e.g., 9×9 to 4×4 or 8×4 to 4×2). In some embodiments, zooming can be continuous or performed in increments of less than whole rows and/or columns, which may result in views with partial representations displayed along the edges of the view. 
     In some embodiments, movement of the rotatable input mechanism  602  in a first direction (e.g., clockwise) causes the view of the image to be zoomed in, and rotation in a second direction opposite the first direction (e.g. counter-clockwise) causes the view to be zoomed out. For example, movement of rotatable input mechanism  602  in a direction opposite to the direction of movement  1305  may cause device  600  to switch the display from user interface  1330  back to user interface  1300 . 
     In some embodiments, movement of rotational input mechanism while zoomed in view  1340  is displayed causes device  600  to replace the display of the composite image  1320  with a display of a photo in the collection represented by composite image  1320 . User interaction  1315 , represented by the arrow above rotatable input mechanism  602  in  FIG. 13B , indicates a movement of rotational input mechanism while view  1340  of image  1320  is displayed. In some embodiments, device  600  replaces the user interface including the view of the composite image with a display of a photo in the collection represented by the composite image. For example, as shown in  FIG. 13C , in response to user interaction  1315 , device  600  may display the photo at the center of the view displayed at the time of the user interaction (i.e., photo M). In some embodiments, the display of the composite image is replaced with a photo corresponding to a representation at a location in the view other than the center (e.g., the photo corresponding to a representation in the top left corner of the view). 
     In some embodiments, movement of rotational input mechanism while zoomed in view  1340  is displayed causes device  600  to zoom in the view even further. The decision whether to displays a photo or zoom the view of the composite image may depend on various factors, such as the displayed size of the representations in the current view and the number of rows and/or columns displayed in the current view. For example, if the representations are displayed at a size larger than a predetermined size (e.g., ⅓ the height of the display), or if the number of rows of representations appearing in the view of the composite image is less than a predetermined value (e.g., 4 rows), device  600  may display a photo instead of zooming the view of the composite image in response to detecting movement of the rotational input mechanism. Optionally, if the representations are displayed at a size smaller than the predetermined size, or if the number of rows of representations appearing in the view of the composite image is greater than the predetermined value, movement of the rotational input mechanism may cause the view to be zoomed in further. 
       FIG. 13C  also indicates a movement  1325  of rotational input mechanism (represented by the arrow above rotatable input mechanism  602 ) while user interface  1350  including photo M is displayed. In some embodiments, movement of the rotational input mechanism while a photo is displayed causes device  600  to display metadata associated with the displayed photo.  FIG. 13D  illustrates an exemplary user interface object  1355  that may be displayed in response to movement  1325 . User interface object  1355  includes metadata associated with photo M. The metadata may include people, a place, an event, a date and/or time, and weather status associated with photo M. 
     In some embodiments, a displayed view of a composite image can be zoomed in by a touch-based gesture on the touch-sensitive display.  FIG. 14A  shows an exemplary user interface  1400  including a view  1410  of composite image  1420 . A user performs a tap gesture  1405  on a representation  1421  corresponding to a photo S. Device  600  may detect the tap gesture  1405  and, in response, transition the display of view  1401  to a zoomed-in view in which the representations of image  1420  are displayed at a larger size. In some embodiments, device  600  centers the zoomed-in view on the representation or portion of the image located at the position of the tap.  FIG. 14B  shows an exemplary user interface  1430  including a zoomed in view  1440  of image  1420  with the representation of photo S at the center of the view. In other embodiments, in response to a tap on user interface  1400 , device  600  may zoom in on the center of the view (e.g., representation M) regardless of the location of the tap. 
     In some embodiments, a pinching gesture (e.g., two points of contact coming closer together) on the touch-sensitive display causes device  600  to zoom out the view of the composite image, and a de-pinching gesture (e.g., two points of contact separating) may cause the view to be zoomed in, or vice versa. 
     In some embodiments, different types of inputs can be combined to navigate between various user interfaces and displays of photos. For example, in response to a tap gesture at representation M in  FIG. 13A , device  600  may replace view  1310  of composite image  1320  with zoomed-in view  1340  ( FIG. 13B ). Then, in response to a movement (e.g., rotation) of the rotatable input mechanism  602 , device  600  may replace view  1340  with a display of photo M  1350  ( FIG. 13C ). Further, in response to a de-pinching gesture on the display of photo M, device  600  may display user interface object  1355  ( FIG. 13D ) showing metadata of the photo. 
       FIGS. 15A-15C  illustrate another technique to assist a user in viewing the composite image when the representations are displayed at a relatively small size.  FIG. 15A  depicts user interface  1500 , which includes a view  1510  of composite image  1520 . A user provides a touch  1505  on the touch-sensitive display of device  600  and holds the touch for a duration of time. Device  600  detects a contact associated with touch  1505  and determines whether the duration of the contact exceeds a predetermined threshold. In response to determining that the duration of the contact exceeds the predetermined threshold, device  600  may display an enlarged view (e.g., a preview) of a portion of image  1520  surrounding or adjacent to the location of the point of contact. 
       FIG. 15B  illustrates user interface  1500  with an exemplary user interface object  1530  that includes an enlarged view of a portion of image  1520 . User interface object  1530  shows an enlarged view of a circular portion of image  1520  surrounding the location at which the user touches the display. In  FIG. 15B , the user touches the screen at a location corresponding to the center of the representation of a photo Q. Based on the location of the detected contact associated with touch  1505 , user interface object  1530  shows an enlarged view of the image  1520  surrounding the center of the representation of photo Q. 
     In some embodiments, it is possible for a user to scan along the image to view an enlarged view of a different portion of the image. Without releasing the touch  1505 , a user may drag (e.g., slide) the touch to a different point on the display. In  FIG. 15C , the position of touch  1505  has been slid (e.g., translated) from the center of the representation of photo Q to a location between the representations for photo N and photo S. While continuing to detect the contact associated with touch  1505 , device  600  may detect the translation of the contact along the touch-sensitive display. In response to detecting the translation of the contact to the new point of contact, device  600  may replace the display of the enlarged view of the portion of the composite image surrounding photo Q with an enlarged view of a portion of the image surrounding or adjacent to the updated point of contact.  FIG. 15C  shows user interface object  1530  with the view in  FIG. 15B  replaced with an enlarged view of image  1520  centered between the representation of photo N and the representation of photo S in response to the contact being translated. 
     In the embodiment illustrated in  FIGS. 15B and 15C , the enlarged view is displayed above the point of contact. In some embodiments, the enlarged view is displayed in an absolute location (e.g., top center of the display) or in a position relative to the point of contact. In some embodiments, the location of the enlarged view changes based on the point of contact. For example, if the contact is close to the right edge of the display, the enlarged view may be displayed to the left of the point of contact so that it is not cut off by the side of the display. In some embodiments, the enlarged view is removed if the contact ends. 
     In some embodiments, in response to a user input detected on the touch-sensitive display, device  600  displays an enlarged view (e.g., a preview) of a representation of a photo.  FIG. 16A  depicts user interface  1600 , which includes a view  1610  of composite image  1620 . Composite image  1620  includes representations of photos arranged in a rectangular grid. A user provides a touch  1605  on the touch-sensitive display of device  600  and holds the touch for a duration of time. Device  600  detects a contact associated with touch  1605  and determines whether the duration of the contact exceeds a predetermined threshold. Device  600  may also determine a representation in image  1620  corresponding to the point of contact. 
     In response to determining that the duration of the contact exceeds the predetermined threshold, device  600  may display a user interface object showing an enlarged view (e.g., a preview) of the representation in image  1620  determined to correspond to the point of contact.  FIG. 16B  illustrates an exemplary user interface showing a user interface object  1630  that includes an enlarged view of the representation located at the point of contact. In some embodiments, user interface object  1630  includes a preview or image of a photo corresponding to the representation associated with the point of contact determined by device  600 . In the depicted example, the point of contact is at a location corresponding to the representation of photo Q, and the user interface object  1630  shows an enlarged view only of the representation of photo Q. 
     In some embodiments, it is possible for a user to scan along the image to view an enlarged view of a different representation. Without releasing the touch  1605 , a user may drag the touch to a different point on the display. In  FIG. 16C , the position of touch  1605  has been moved (e.g., translated) from the representation of photo Q to a location on the representations for photo N. While continuing to detect the contact associated with touch  1605 , device  600  detects the translation of the contact along the touch-sensitive display. In response to detecting the translation of the contact to the new point of contact, device  600  may replace the display of the enlarged view of the representation of photo Q with an enlarged view of the representation at the updated point of contact.  FIG. 16C  shows user interface object  1640  with an enlarged view of the representation of photo N. 
     Attention is now drawn to techniques in which the photo application of device  600  may invoke different responses based on the intensity of a detected contact.  FIG. 17A  depicts user interface  1700 , which includes a view  1710  of composite image  1720 . Composite image  1720  includes representations of photos arranged in a rectangular grid. A user provides a touch  1705  on the touch-sensitive display of device  600  at a representation  1721  corresponding to photo S. Device  600  detects a contact associated with touch  1705  and determines a measurement of an intensity (e.g., a characteristic intensity) of the contact. In some embodiments, device  600  provides different responses based on the intensity of the contact. 
     As illustrated in  FIG. 17A , if the characteristic intensity of the contact is below a threshold, device  600  replaces the display of user interface  1700  with a display of user interface  1730  including a display of photo S. In some embodiments, if the characteristic intensity of the contact is below the threshold, device  600  replaces view  1710  with a zoomed-in view of composite image  1720  centered on the representation  1721  at the point of contact (e.g., view  1421  shown in  FIG. 14B ). In some embodiments, if the characteristic intensity of the contact is below the threshold, device  600  replaces view  1710  with a view of composite image  1720  having the same scale but which is centered on the representation  1721  at the point of contact. 
     In some embodiments, if the characteristic intensity of the contact is above the threshold, device  600  maintains the display of user interface  1700  and adds a display of a user interface object representing a menu of one or more selectable options. As shown for example in  FIG. 17A , device  600  may display a menu object  1740 , which includes text  1742  to prompt a user to decide whether to share the collection of photos represented by image  1720 . That is, in response to a determination that a characteristic intensity of the contact is above the threshold intensity, device  600  displays a user interface menu including at least one user interface object, where the user interface object represents an option to share the collection of photos. Optionally, menu object  1740  may prompt a user to decide whether to share the photo corresponding to the selected representation (e.g., photo S). A sharing operation may include sending one or more photos via email, text message, or the like. Sharing may also include posting one or more photos and/or a link to one or more photos on a social media website (e.g., Facebook, Twitter, etc.). 
     Menu object  1740  also includes affordance  1744  representing the option “YES” and affordance  1746  representing the option “NO”. Selection of affordance  1744  indicates that the user desires to share the photos, and may cause device  600  and/or a paired external device (e.g., external device  650 ) to share the photos. Selection of affordance  1746  indicates that the user does not desire to share the photos, and may cause the device  600  to remove the display of menu object  1740  from user interface  1700 . 
     In some embodiments, if the characteristic intensity of the contact is above the threshold, device  600  displays one or more user interface objects representing an option to comment on and/or express an opinion about a photo or collection of photos.  FIG. 17B  illustrates an alternative exemplary response of device  600  to an input on the touch-sensitive display while user interface  1700  is displayed. As illustrated in  FIG. 17B , if the characteristic intensity of the contact is below a threshold, device  600  replaces the display of user interface  1700  with a display of photo S, as described with reference to  FIG. 17A . 
     If the characteristic intensity of the contact is above the threshold, device  600  maintains the display of user interface  1700  and adds a display of user interface objects  1750  and  1760 . User interface object  1750  represents an option to express an opinion about the collection of photos represented in image  1720 . For example, selection of affordance  1750  may cause device  600  and/or a paired external device to “Like” the collection of photos on a social media website (e.g., Facebook) on behalf of the user. User interface object  1760  represents an option to comment on the collection of photos represented in image  1100 . For example, selection of affordance  1760  may cause the device  600  to display a text input box to input comments. 
     In some embodiments, if the characteristic intensity of the contact is above the threshold, device  600  displays a user interface menu including a user interface object representing an option to display a selected photo as a background of a user interface on the display of device  600 . As illustrated in  FIG. 17C , if the characteristic intensity of the contact is below a threshold, device  600  replaces the display of user interface  1700  with a display of photo S, as described above with reference to  FIG. 17A . If the characteristic intensity of the contact is above the threshold, device  600  maintains the display of user interface  1700  and adds a display of user interface object  1770 . User interface object  1700  represents an option to display the photo corresponding to the selected affordance (i.e., PHOTO S in  FIG. 17C ) as a background of a user interface on the display of device  600 . 
     In some embodiments, device  600  is a wearable electronic device that is configured to display a user interface that represents a clock face. The clock face may comprise the selected photo as a background, a user interface object indicating a time of day, and another user interface object indicating a date. In some embodiments, the appearance of the user interface object indicating the date is blended with the background photo to create a more subtle or aesthetically appealing display of the date. 
     In some embodiments, the response of device  600  to touch  1705  depends on the measured characteristic intensity of the detected contact associated with the touch relative to more than one threshold. In some embodiments, if the characteristic intensity is below a first threshold, device  600  responds in a first manner; if the characteristic intensity is above the first threshold and below a second threshold, device  600  responds in a second manner; and if the characteristic intensity is above the second threshold, device  600  responds in a third manner. For example, if the characteristic intensity is below a first threshold, device  600  replaces the display of user interface  1700  with a display of user interface  1730  including a display of photo S (e.g.,  1730  in  FIG. 17A ); if the characteristic intensity is above the first threshold and below a second threshold, device  600  displays a user interface object representing an option to share the collection of photos (e.g.,  1740  in  FIG. 17A ); and if the characteristic intensity is above the second threshold, device  600  displays a user interface object (e.g.,  1770  in  FIG. 17C ) representing an option to display the photo corresponding to the selected affordance (i.e., PHOTO S) as a background of a user interface on the display of device  600 . 
     As mentioned above, certain techniques described herein can be applied to media other than a single photo. In some embodiments, a composite image (e.g.,  1720  in  FIG. 17C ) includes at least one representation of a sequence of images (e.g., a plurality of images in a particular order) in addition to or instead of photos as described above. For example, in some embodiments, representation  1721  selected by touch  1705  corresponds to a sequence of images instead of PHOTO S, and display  1730  includes a representation of the sequence of images (e.g., a representative image of the sequence of images). Furthermore, in some embodiments, the sequence of images can be selected to be used as a background in accordance with the techniques described with reference to  FIG. 17C  (e.g., instead of PHOTO S). 
       FIG. 17D  illustrates an exemplary sequence  1780  of images  1780 - 1  through  1780 - 5  including a first image  1780 - 1  and a last image  1780 - 5 . One of images  1780 - 1  through  1780 - 5  is designated as a representative image. For purposes of illustration, image  1780 - 3  is referred to as the representative image in the following examples. The representative image may be determined in various ways. In some embodiments, the representative image is the image at a predetermined location of the sequence (e.g., the first, middle, or last). In some embodiments, the representative image is determined based on how the images of the sequence were captured. In some embodiments, a user selects the representative image using a graphical interface. Exemplary methods and user interfaces for acquiring a sequence of images and determining the representative image are also described in Appendix A (titled “Devices and Method for Capturing and Interacting with Enhanced Digital Images”) and Appendix B (titled “Method and Apparatus For Finding And Using Video Portions That Are Relevant To Adjacent Still Images”) filed with U.S. Provisional Application Ser. No. 62/172,223, which is incorporated by reference above in its entirety, including Appendices A and B. 
     Various ways in which a sequence of images such as sequence  1780  can be used as a background (e.g., a background of a clock face) will now be described with reference to  FIGS. 17E-17L . In some embodiments, in response to selection of sequence  1780  as a background, representative image  1780 - 3  of sequence  1780  is used as a background for device  600 . 
     In some embodiments, wearable electronic device  600  is a watch configured to be worn on a user&#39;s wrist and to detect motion input indicative of the user&#39;s wrist being raised (e.g., to detect a wrist raise gesture). Exemplary techniques for detecting a wrist raise gesture are described in U.S. Provisional Patent Application Ser. No. 62/026,532, “Raise Gesture Detection in a Device,” filed Jul. 18, 2014. 
     In some embodiments, device  600  detects an input indicative of a wrist raise gesture, and in response, displays one or more of the images of the sequence of images. Optionally, device  600  displays the images of a sequence such that they appear as an animation. 
     In one example, in response to detecting a first input indicative of a wrist raise gesture, device  600  displays, in sequence, a first set of one or more images from sequence  1780  that are positioned before representative image  1780 - 3  and representative image  1780 - 3  (e.g., first image  1780 - 1  through representative image  1780 - 3  depicted in  FIG. 17E ). Optionally, device  600  maintains the display of representative image  1780 - 3  until further input is received. In this way, upon detecting a wrist raise gesture, device  600  can display the beginning of sequence  1780  (e.g., starting at first image  1780 - 1 ) up to representative image  1780 - 3 . 
     In some embodiments, after display of the first set of images, device  600  detects a second input (e.g., a press and hold or tap on the touch-sensitive display) and, in response, displays, in sequence, a second set of one or more images from sequence  1780  that are positioned after representative image  1780 - 3  (e.g., image  1780 - 4  and last image  1780 - 5  as depicted in  FIG. 17F ). In this way, device  600  allows the user to view the end of sequence  1780  by providing further input after raising his or her wrist. 
     In some embodiments, the second input includes a first portion and a second portion (e.g., a back and forth rotation of the wrist detected by a gyro in device  600 ). In response to the first portion of the second input, device  600  displays, in sequence, a second set of one or more images from sequence  1780  that are positioned after representative image  1780 - 3  (e.g., image  1780 - 4 ); and in response to the second portion of the second input, device  600  displays, in sequence, a third set of one or more images from sequence  1780  that are positioned after representative image  1780 - 3  (e.g., image  1780 - 5 ), where the third set is after the second set and includes last image  1780 - 5 . In this way, device  600  allows the user to display the remaining images of sequence  1780  by performing a compound input. 
     In some embodiments, the second input includes a rotation of rotatable input mechanism  602 . In response to the rotation of rotatable input mechanism  602 , device  600  replaces the display of representative image  1780 - 3  with another image from sequence  1780 . In the present example, the other image is image  1780 - 5 . Optionally, device  600  also displays the images between representative image  1780 - 3  and image  1780 - 5  (e.g., image  1780 - 4 ). In some embodiments, in response to a rotation of the rotatable input mechanism in a first direction, the images between representative image  1780 - 3  and image  1780 - 5  are displayed in sequence (e.g., image  1780 - 4  to image  1780 - 5  as depicted in  FIG. 17F ); and in response to a rotation of the rotatable input mechanism in a second direction opposite the first direction, the images between representative image  1780 - 3  and image  1780 - 5  are displayed in reverse sequence (e.g.,  1780 - 2  to  1780 - 1  to  1780 - 5  as depicted in  FIG. 17G ). In this way, after the initial display of the first set of images upon detection of the wrist raise gesture, device  600  can allow a user to scroll through the images of sequence  1780  using rotatable input mechanism  602  to display another image. 
     In some embodiments, while displaying image  1780 - 5 , device  600  receives a third input representing selection of image  1780 - 5  as the representative image (e.g., a touch having a characteristic intensity greater than a threshold intensity or a press of rotatable input mechanism  602 ). In response to further inputs, device  600  performs the methods described herein with image  1780 - 5  as the representative image. 
     In another example, in response to detecting the first input indicative of a wrist raise gesture, device  600  displays, in sequence, representative image  1780 - 3  and a first set of one or more images from sequence  1780  that are positioned after representative image  1780 - 3  (e.g., representative image  1780 - 3  through last image  1870 - 5  as depicted in  FIG. 17H ). Optionally, device  600  displays last image  1780 - 5  and maintains the display of last image  1780 - 5  until further input is received. In this way, device  600  can display the end of sequence  1780 , starting from representative image  1780 - 3 , in response to a wrist raise by a user. 
     In some embodiments, after display of the first set of images, device  600  detects a second input (e.g., a press and hold or tap on the touch-sensitive display) and, in response, displays, in sequence, a second set of one or more images from sequence  1780  that are positioned before representative image  1780 - 3  and representative image  1780 - 3  (e.g., first image  1780 - 1  through representative image  1780 - 3  as depicted in  FIG. 17I ). In this way, device  600  allows the user to view the beginning of the sequence, which was not displayed upon the wrist raise. 
     In some embodiments, the second input includes a first portion and a second portion after the first portion (e.g., back and forth wrist rotation). In response to the first portion of the second input, device  600  displays, in sequence, a second set of one or more images from sequence  1780  that are positioned before representative image  1780 - 3  (e.g., first image  1780 - 1 ); and in response to the second portion of the second input, device  600  displays, in sequence, a third set of one or more images from sequence  1780  that are positioned before or includes representative image  1780 - 3  (e.g., image  1780 - 2  and  1780 - 3 ), where the second set is before the third set, the second set includes first image  1780 - 1 , and the third set includes representative image  1780 - 3 . In this way, device allows the user to display the beginning of sequence  1780 , which was not displayed upon detection of the wrist raise gesture, by performing a compound input 
     In embodiments in which the second input includes a rotation of rotatable input mechanism  602 , in response to the rotation of rotatable input mechanism  602 , device  600  replaces the display of last image  1780 - 5  with another image from sequence  1780 . In the present example, image  1780 - 2  is the other image. Optionally, device  600  also displays the images between last image  1780 - 5  and image  1780 - 2  (e.g., image  1780 - 1 ). In this way, after the initial display of the first set of images upon detection of the wrist raise gesture, device  600  can allow a user to scroll through sequence  1780  using rotatable input mechanism  602  to display another image. In some embodiments, in response to a rotation of the rotatable input mechanism in a first direction, the images between last image  1780 - 5  and image  1780 - 2  are displayed in sequence (e.g., image  1780 - 1  to image  1780 - 2  as depicted in  FIG. 17J ); and in response to a rotation of the rotatable input mechanism in a second direction opposite the first direction, the images between last image  1780 - 5  and image  1780 - 2  are displayed in reverse sequence (e.g.,  1780 - 4  to  1780 - 3  to  1780 - 2  as depicted in  FIG. 17K ). 
     In some embodiments, while displaying image  1780 - 2 , device  600  receives a third input selecting image  1780 - 2  as the representative image (e.g., a touch having a characteristic intensity greater than a threshold intensity or a press of rotatable input mechanism  602 ). In response to further inputs, device  600  performs the methods described herein with image  1780 - 2  as the representative image. 
     In another example, in response to detecting the first input indicative of a wrist raise gesture, device  600  displays, in sequence, a first set of images from sequence  1780  including representative image  1780 - 3 , one or more images positioned after representative image  1780 - 3  (e.g.,  1870 - 4  and last image  1870 - 5 ), one or more images positioned before representative image  1780 - 3  (e.g., first image  1870 - 1  and image  1870 - 2 ), and representative image  1780 - 3  again (e.g.,  FIG. 17L ). Optionally, device  600  maintains the display of representative image  1780 - 3  until further input is received. In this way, device  600  presents the full sequence, beginning and ending with representative image  1780 - 3 , in response to a wrist raise. 
     In some embodiments, after display of the first set of images, device  600  detects a second input (e.g., a press and hold or tap on the touch-sensitive display) and, in response, displays, in sequence, a second set of one or more images from sequence  1780  that are positioned after representative image  1780 - 3  (e.g., image  1780 - 4  and last image  1780 - 5  as depicted in  FIG. 17F ). In this way, device  600  allows the user to view the end of sequence  1780  after representative image  1780 - 3  by providing further input after a wrist raise. 
     In embodiments in which the second input includes a first portion and a second portion (e.g., back and forth wrist rotation), in response to the first portion of the second input, device  600  displays, in sequence, a second set of one or more images from sequence  1780  that are positioned after representative image  1780 - 3  (e.g., image  1780 - 4 ); and in response to the second portion of the second input, device  600  displays, in sequence, a third set of one or more images from sequence  1780  that are positioned after representative image  1780 - 3  (e.g., image  1780 - 5 ), where the third set is after the second set and includes last image  1780 - 5 . In this way, device  600  allows the user to display the remaining images of sequence  1780  after representative image  1780 - 3  by performing a compound input. 
     In embodiments in which the second input includes a rotation of rotatable input mechanism  602 , in response to the rotation of rotatable input mechanism  602 , device  600  replaces the display of representative image  1780 - 3  with another image from sequence  1780 . In the present example, image  1780 - 5  is the other image. Optionally, device  600  also displays the images between representative image  1780 - 3  and image  1780 - 5  (e.g., image  1780 - 4 ). In this way, after the initial display of the first set of images upon detection of the wrist raise gesture, device  600  can allow a user to scroll through sequence  1780  using rotatable input mechanism  602  to display another image. In some embodiments, in response to a rotation of the rotatable input mechanism in a first direction, the images between representative image  1780 - 3  and image  1780 - 5  are displayed in sequence (e.g., image  1780 - 4  to image  1780 - 5  as depicted in  FIG. 17F ); and in response to a rotation of the rotatable input mechanism in a second direction opposite the first direction, the images between representative image  1780 - 3  and image  1780 - 5  are displayed in reverse sequence (e.g.,  1780 - 2  to  1780 - 1  to  1780 - 5  as depicted in  FIG. 17G ). 
     In some embodiments, while displaying image  1780 - 5 , device  600  receives a third input selecting the image as the representative image (e.g., a touch having a characteristic intensity greater than a threshold intensity or a press of rotatable input mechanism  602 ). In response to further inputs, device  600  performs the methods described herein with image  1780 - 5  as the representative image. 
     In addition to the techniques described in the present disclosure, in some embodiments, the images in the sequence may be displayed according to techniques described in Appendix A and Appendix B filed with U.S. Provisional Application Ser. No. 62/172,223. 
     Turning now to  FIG. 18A , in some embodiments, device  600  determines a measurement of the characteristic intensity of a contact while a photo is displayed (e.g., user interface  710 ,  1110 , or  1730 ) and provides different responses based on the intensity.  FIG. 18A  illustrates an exemplary response of device  600  to touch  1805  on the touch-sensitive display while displaying user interface  1800 . User interface  1800  includes a display of a photo S. Device  600  detects a contact associated with touch  1805 . As indicated in  FIG. 18A , if device  600  determines that the characteristic intensity of the detected contact is below a threshold, device  600  continues to display user interface  1800  including photo S. In some embodiments, device  600  replaces the display of photo S with a display of a different photo (e.g., photo T in the same collection). If device  600  determines that the characteristic intensity of the contact is above the threshold, device  600  may add a display of user interface object  1810  to user interface  1800  prompting a user to decide whether to share photo S. User interface object  1810  may be analogous to user interface object  1740  described above with reference to  FIG. 17A . 
       FIG. 18B  illustrates another exemplary response of device  600  to touch  1805  on the touch-sensitive display while displaying user interface  1800 . As illustrated in  FIG. 18B , if device  600  determines that the characteristic intensity of the contact is below a threshold, device  600  continues to display photo S. In some embodiments, device  600  replaces the display of photo S with a display of a different photo. If device  600  determines that the characteristic intensity of the contact is above the threshold, device  600  may add a display of user interface objects  1820  and  1830  to user interface  1800  representing options to comment on and/or express an opinion about photo S. User interface objects  1820  and  1830  may be analogous to user interface objects  1750  and  1760  described above with reference to  FIG. 17B . 
       FIG. 18C  illustrates another exemplary response of device  600  to touch  1805  on the touch-sensitive display while user interface  1800  is displayed. As illustrated in  FIG. 18C , if device  600  determines that the characteristic intensity of the contact is below a threshold, device  600  continues to display photo S. In some embodiments, device  600  replaces the display of PHOTO S with a display of a different photo. If device  600  determines that the characteristic intensity of the contact is above the threshold, device  600  may add a display of user interface object  1840  to user interface  1800  to provide the option of setting photo S as the background of a user interface of device  600 . User interface object may be analogous to user interface object  1770  described above with reference to  FIG. 17C . 
     In some embodiments, the response of device  600  to touch  1805  depends on the measured characteristic intensity of the contact relative to more than one threshold. In some embodiments, if the characteristic intensity is below a first threshold, device  600  responds in a first manner; if the characteristic intensity is above the first threshold and below a second threshold, device  600  responds in a second manner; and if the characteristic intensity is above the second threshold, device  600  responds in a third manner. For example, if the characteristic intensity is below a first threshold, device  600  displays a different photo; if the characteristic intensity is above the first threshold and below a second threshold, device  600  displays a user interface object representing an option to share the photo (e.g.,  1810  in  FIG. 18A ); and if the characteristic intensity is above the second threshold, device  600  displays a user interface object (e.g.,  1840  in  FIG. 18C ) representing an option to display the photo as a background of a user interface on the display of device  600 . 
     However, photos often do not match the size of a display or may include unwanted area that a user does not want to be part of the background. Additional exemplary user interfaces for selecting a photo as a background are described below with reference to  FIG. 18D . The described techniques provide the benefit of efficient methods and user interfaces for zooming and cropping a photo to allow a user to select a desired portion of the photo as a background. 
     Turning to  FIG. 18D , a photo  1850  is displayed. In some embodiments, a user can select photo  1850  according to the techniques described above with reference to  FIGS. 13A-13C . For example, a user can zoom a view of a composite image (e.g., a 9×9 grid including representations of photos or other media) by moving rotatable input mechanism  602  and, by further rotating the rotatable input mechanism, cause device  600  to replace the display of the composite image with a display of a photo in the collection represented by the composite image. Accordingly, photo  1850  can be displayed by using rotatable input mechanism  602  to zoom in to photo  1850  from a composite image including a representation of photo  1850 . 
     As indicated in  FIG. 18D , device  600  receives further movement  1852  of rotatable input mechanism  602  while displaying photo  1850 . In response to further movement  1852 , device  600  zooms photo  1850  and displays a first portion  1850 A of an enlarged view of photo  1850 . Device  600  then receives a drag gesture  1854  that moves horizontally from left to right across the display. In response to drag gesture  1854 , device  600  translates the enlarged view of photo  1850  to the right in the direction of drag gesture  1854  to display a second portion  1850 B of the enlarged view of photo  1850 . 
     After photo  1850  has been zoomed and translated, device  600  receives a user interaction, touch  1856 . Similar to the response described with reference to  FIG. 18C , in accordance with a determination that a characteristic intensity of touch  1856  exceeds a predetermined threshold, device  600  displays user interface object  1860  which includes an affordance  1862  for setting the currently displayed view, e.g., second portion  1850 B of photo  1850 , as the background of a user interface of device  600 . In the illustrated embodiment, in response to selection of affordance  1862 , device  600  uses second portion  1850 B as the background of a clock face  1890  on device  600 . 
     In some embodiments, in response to selection of affordance  1862 , device  600  replaces the display of photo  1850  and user interface object  1860  with clock face  1890  which includes portion  1850 B as the background, as shown in  FIG. 18D . Clock face  1890  also includes user interface objects  1892  and  1894 , which indicate the time and day of the month, respectively. 
     In some embodiments, in response to selection of affordance  1862 , device  600  remains in a photo viewing mode. For example, device  600  may remove the display of user interface object  1860  and, optionally, reset (e.g., un-zoom and re-center) the display of photo  1850 . Upon exiting the photo viewing mode and entering a clock face mode, device  600  displays clock face  1890  with portion  1850 B as the background. 
     Although selection of the enlarged portion of photo  1850  is described above with reference to the intensity of touch  1856  and selection of affordance  1858 , it should be recognized that various alternative techniques are possible. In some embodiments, device  600  directly sets portion  1850 B as a background in response to touch  1856  without requiring display of user interface object  1860  and selection of affordance  1862 . For example, device  600  may directly set portion  1850 B as a background if touch  1856  is a multi-finger gesture or a multi-tap gesture, or in accordance with a determination that a characteristic intensity of touch  1856  exceeds a predetermined threshold. 
     In some embodiments, device  600  determines a measurement of the characteristic intensity of a contact while a cover image is displayed and provides different responses based on the intensity.  FIG. 19  illustrates an exemplary response of device  600  to touch  1905  on the touch-sensitive display while cover image  1900  for an album is displayed. Cover image  1900  is indicative of a collection of photos labeled Album  3 . Device  600  detects a contact associated with touch  1905 . As indicated in  FIG. 19 , if device  600  determines that the characteristic intensity of the contact is below a threshold, device  600  replaces cover image  1900  with a user interface displaying a photo from the album indicated by the cover image. In  FIG. 18 , device  600  displays photo  3 A, which may be the first photo in Album  3 . If device  600  determines that the characteristic intensity of the contact is above the threshold, device  600  replaces cover image  1900  with a display of a cover image indicative of a different collection of photos. In the depicted example, device  600  replaces cover image  1900  with a display of a cover image  1920  indicative of a collection labeled Album  4 . In some embodiments, device  600  replaces cover image  1900  with a display of a cover image indicative of a different collection of photos in response to a swipe gesture (e.g., from right to left) on the touch-sensitive display while cover image  1900  is displayed. 
     In some embodiments, device  600  determines a measurement of the characteristic intensity of a contact while a composite image is displayed and provides different responses based on the intensity.  FIG. 20  illustrates an exemplary response of device  600  to touch  2005  on the touch-sensitive display while user interface  2000  including view  2010  of composite image  2020  is displayed. Composite image  2020  may include representations of photos in a first collection of photos. Device  600  detects a contact associated with touch  2005 . As illustrated in  FIG. 20 , if device  600  determines that the characteristic intensity of the contact is below a threshold, device  600  replaces the display of user interface  2000  (including composite image  2020 ) with a display of a photo from the collection represented by the displayed composite image (e.g., image  2020 ). In  FIG. 20 , device  600  displays photo IA, which may be the first photo in the corresponding collection. If device  600  determines that the characteristic intensity of the contact is above the threshold, device  600  replaces the display of user interface  2000  with a display of a user interface including a composite image corresponding to a different collection of photos. In the example illustrated in  FIG. 20 , device  600  replaces composite image  2020  with a display of composite image  2060  corresponding to a second collection. In some embodiments, device  600  replaces the display of a first composite image associated with a collection of photos with a display of a second composite image associated with another collection of photos in response to a swipe gesture (e.g., from right to left) on the touch-sensitive display while the first composite image is displayed. 
     Attention is now directed to techniques for indicating the position of a user interface among a plurality of user interfaces.  FIG. 21A  shows an exemplary user interface  2100  including a vertical list of affordances corresponding to different collections of photos. User interface  2100  also includes affordances  2102  and  2104  indicating the position of user interface  2100  among a plurality of user interfaces. Affordances  2012  and  2104  may enlarge, darken, or otherwise change in visual appearance when the corresponding user interface is displayed. In the exemplary implementation illustrated by user interface  2100 , affordances  2102  and  2104  are paging dots. The number of dots may indicate the number of user interfaces in the plurality of user interfaces. On user interface  2100 , affordance  2102  is highlighted to indicate that user interface  2100  is the first of two user interfaces, the user interfaces being in order from left to right. 
       FIG. 21B  shows an exemplary user interface  2120  including displayed photos. In some embodiments, the photos displayed on user interface  2120  include photos designated by a user (e.g., “favorites”) and/or photos from a photo stream. Photos may be designated or added to a photo stream using an external device for viewing on device  600 . User interface  2120  also includes affordances  2102  and  2104  indicating the position of user interface  2120  with respect to user interface  2100 . On user interface  2120 , affordance  2104  is highlighted to indicate that user interface  2120  is the second of the two user interfaces depicted in  FIGS. 21A-21B . 
     Device  600  may replace the display of user interface  2100  with the display of user interface  2120  in response to a user interaction with the touch-sensitive display. As indicated by  FIGS. 21A-21B , a user may switch the display from user interface  2100  to  2120  with a swipe gesture indicated by swipe  2105 . 
       FIG. 21C  shows another exemplary user interface  2130  that may be displayed on the display of device  600  in response to swipe  2105  on user interface  2100 . Instead of displaying photos as in user interface  2120 , user interface  2130  includes a list of affordances corresponding to photo streams that may be available for display. Also, affordance  2104  is highlighted to indicate that user interface  2130  is the second of two available user interfaces. 
       FIG. 21C  also depicts a tap  2135  on an affordance associated with a photo stream, Stream  3 .  FIG. 21D  shows user interface  2140 , which may be displayed in response to tap  2135 . User interface  2140  includes a display of photos included in Stream  3 . That is, in response to selection of an affordance corresponding to a photo stream (e.g., Stream  3 ), device  600  may replace the display of user interface  2130  with the display of user interface  2140 . 
       FIG. 22  is a flow diagram illustrating a method  2200  for accessing, navigating, and displaying photos using an electronic device in accordance with some embodiments. Method  2200  is performed at a device (e.g.,  100 ,  300 ,  500 ) with a touch-sensitive display and a rotatable input mechanism Some operations in method  2200  may be combined, the order of some operations may be changed, and some operations may be omitted. 
     As described below, method  2200  provides an intuitive way to access and view a collection of photos, which allows a user to quickly and easily locate a desired photo on a reduced size user interface. The method reduces the cognitive burden on a user when browsing a collection of photos, thereby creating a more efficient human-machine interface. For battery-operated computing devices, enabling a user to view photos more quickly and more efficiently conserves power and increases the time between battery charges. 
     At block  2202 , the electronic device receives, via wireless communication, data representing a collection of photos stored on an external device (e.g.,  650 ). At block  2204 , the electronic device displays, on the touch-sensitive display (e.g.,  112 ,  340 ,  504 ), a user interface (e.g.,  610 ,  1010 ,  1020 ) including a user interface object (e.g.,  620 ,  1011 - 1014   1021 - 1024 ,  1120 ), the user interface object representing the collection of photos. At block  2206 , the electronic device detects a first user interaction (e.g.,  700 ,  1005 ,  1100 ) with the displayed user interface object. At block  2208 , in response to detecting the first user interaction with the displayed user interface object, the electronic device replaces the display of the user interface with a display of a first view (e.g.,  1140 ,  1210 ,  1310 ,  1410 ,  1510 ,  1610 ,  1710 ,  2010 ) of an image (e.g.,  1150 ,  1220 ,  1320 ,  1420 ,  1520 ,  1620 ,  1720 ,  2020 ). The image may comprise a first representation (e.g.,  1151 ,  1221 ,  1421 ) including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos. The first representation and the second representation may be arranged in the image in fixed positions with respect to each other, and, in the first view, the first representation and the second representation are displayed at a first size. At block  2210 , the electronic device detects a first movement (e.g.,  1315 ) of the rotatable input mechanism (e.g.,  506 ,  602 ). At block  2212 , in response to detecting the first movement of the rotatable input mechanism, the electronic device transitions the display of the first view of the image to a display of a second view of the image (e.g.,  1340 ). In the second view, the first representation and the second representation are displayed at a second size different than the first size. 
     Note that details of the processes described above with respect to method  2200  (e.g.,  FIG. 22 ) are also applicable in an analogous manner to the methods described below. For example, methods  2300 - 2600  may include one or more of the characteristics of the various methods described above with reference to method  2200 . For example, the user interface objects, views of an image, visual representations, and other user interface elements described above with reference to method  2200  optionally have one or more of the characteristics of the user interface objects, views of an image, visual representations, and other user interface elements described herein (e.g., methods  2300 - 2600 ). For brevity, these details are not repeated below. 
       FIG. 23  is a flow diagram illustrating a method  2300  for accessing, navigating, and displaying photos using an electronic device in accordance with some embodiments. Method  2300  is performed at a device (e.g.,  100 ,  300 ,  500 ) with a touch-sensitive display and a rotatable input mechanism Some operations in method  2300  may be combined, the order of some operations may be changed, and some operations may be omitted. 
     As described below, method  2300  provides an intuitive way to access and view a collection of photos, which allows a user to quickly and easily locate a desired photo on a reduced size user interface. The method reduces the cognitive burden on a user when browsing a collection of photos, thereby creating a more efficient human-machine interface. For battery-operated computing devices, enabling a user to view photos more quickly and more efficiently conserves power and increases the time between battery charges. 
     At block  2302 , the electronic device receives, via wireless communication, data representing a collection of photos stored on an external device (e.g.,  650 ). At block  2304 , the electronic device displays, on the touch-sensitive display (e.g.,  112 ,  340 ,  504 ), a user interface (e.g.,  610 ,  1010 ,  1020 ) including a user interface object (e.g.,  620 ,  1011 - 1014   1021 - 1024 ,  1120 ), the user interface object representing the collection of photos. At block  2306 , the electronic device detects a user interaction (e.g.,  700 ,  1005 ,  1100 ) with the displayed user interface object. At block  2308 , in response to detecting the user interaction with the displayed user interface object, the electronic device replaces the display of the user interface with a display of a first view (e.g.,  1140 ,  1210 ,  1310 ,  1410 ,  1510 ,  1610 ,  1710 ,  2010 ) of an image (e.g.,  1150 ,  1220 ,  1320 ,  1420 ,  1520 ,  1620 ,  1720 ,  2020 ), the image comprising a first representation (e.g.,  1151 ,  1221 ,  1421 ) including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos. The first representation and the second representation are arranged in the image in fixed positions with respect to each other, and, in the first view, the first representation and the second representation are displayed at a first size. At block  2310 , the electronic device detects a contact (e.g.,  1405 ) on the touch-sensitive display while the first view is displayed. At block  2312 , the electronic device determines whether the contact represents a selection of the first representation (e.g.,  1421 ). At block  2314 , in response to a determination that the contact represents a selection of the first representation, the electronic device transitions the display of the first view of the image to a display of a second view (e.g.,  1440 ) of the image, wherein, in the second view, the first representation and the second representation are displayed at a second size that is larger than the first size, and the first representation is displayed at the center of the second view of the image. 
     Note that details of the processes described above with respect to method  2300  (e.g.,  FIG. 23 ) are also applicable in an analogous manner to the methods described below. For example, methods  2200  and  2400 - 2600  may include one or more of the characteristics of the various methods described above with reference to method  2300 . For example, the user interface objects, views of an image, visual representations, and other user interface elements described above with reference to method  2300  optionally have one or more of the characteristics of the user interface objects, views of an image, visual representations, and other user interface elements described herein (e.g., methods  2200  and  2400 - 2600 ). For brevity, these details are not repeated below. 
       FIG. 24  is a flow diagram illustrating a method  2400  for accessing, navigating, and displaying photos using an electronic device in accordance with some embodiments. Method  2400  is performed at a device (e.g.,  100 ,  300 ,  500 ) with a touch-sensitive display and a rotatable input mechanism Some operations in method  2400  may be combined, the order of some operations may be changed, and some operations may be omitted. 
     As described below, method  2400  provides an intuitive way to access and view a collection of photos, which allows a user to quickly and easily locate a desired photo on a reduced size user interface. The method reduces the cognitive burden on a user when browsing a collection of photos, thereby creating a more efficient human-machine interface. For battery-operated computing devices, enabling a user to view photos more quickly and more efficiently conserves power and increases the time between battery charges. 
     At block  2402 , the electronic device receives, via wireless communication, data representing a collection of photos stored on an external device (e.g.,  650 ). At block  2404 , the electronic device displays, on the touch-sensitive display (e.g.,  112 ,  340 ,  504 ), a user interface (e.g.,  610 ,  1010 ,  1020 ) including a user interface object (e.g.,  620 ,  1011 - 1014   1021 - 1024 ,  1120 ), the user interface object representing the collection of photos. At block  2406 , the electronic device detects a user interaction (e.g.,  700 ,  1005 ,  1100 ) with the displayed user interface object. At block  2408 , in response to detecting the user interaction with the displayed user interface object, the electronic device replaces the display of the user interface with an image (e.g.,  1150 ,  1220 ,  1320 ,  1420 ,  1520 ,  1620 ,  1720 ,  2020 ) comprising a first representation (e.g.,  1151 ,  1221 ,  1421 ) including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, wherein the first representation and the second representation are arranged in the image in fixed positions with respect to each other. At block  2410 , the electronic device detects a first point of contact of a contact (e.g.,  1505 ) on the touch-sensitive display, wherein the first point of contact corresponds to a first location on the image. At block  2412 , the electronic device determines whether the duration of the contact exceeds a predetermined threshold. At block  2414 , in response to a determination that the duration of the contact exceeds the predetermined threshold, the electronic device displays an enlarged view (e.g.,  1530 ) of a portion of the image surrounding or adjacent to the first location. 
     Note that details of the processes described above with respect to method  2400  (e.g.,  FIG. 24 ) are also applicable in an analogous manner to the methods described below. For example, methods  2200 ,  2300  and  2500 - 2600  may include one or more of the characteristics of the various methods described above with reference to method  2400 . For example, the user interface objects, views of an image, visual representations, and other user interface elements described above with reference to method  2400  optionally have one or more of the characteristics of the user interface objects, views of an image, visual representations, and other user interface elements described herein (e.g., methods  2200 ,  2300  and  2500 - 2600 ). For brevity, these details are not repeated below. 
       FIG. 25  is a flow diagram illustrating a method  2500  for accessing, navigating, and displaying photos using an electronic device in accordance with some embodiments. Method  2500  is performed at a device (e.g.,  100 ,  300 ,  500 ) with a touch-sensitive display and a rotatable input mechanism Some operations in method  2500  may be combined, the order of some operations may be changed, and some operations may be omitted. 
     As described below, method  2500  provides an intuitive way to access and view a collection of photos, which allows a user to quickly and easily locate a desired photo on a reduced size user interface. The method reduces the cognitive burden on a user when browsing a collection of photos, thereby creating a more efficient human-machine interface. For battery-operated computing devices, enabling a user to view photos more quickly and more efficiently conserves power and increases the time between battery charges. 
     At block  2502 , the electronic device receives, via wireless communication, data representing a first collection of photos and a second collection of photos, wherein the first and second collections are stored on an external device (e.g.,  650 ). At block  2504 , the electronic device displays, on the touch-sensitive display (e.g.,  112 ,  340 ,  504 ), a user interface (e.g.,  610 ,  1010 ,  1020 ) including a user interface object (e.g.,  620 ,  1011 - 1014   1021 - 1024 ,  1120 ) representing the first collection. At block  2506 , the electronic device detects a user interaction (e.g.,  700 ,  1005 ,  1100 ) with the user interface object. At block  2508 , in response to detecting the user interaction with the user interface object, the electronic device replaces the display of the user interface with a display of a first image (e.g.,  1120 ,  1150 ,  1220 ,  1320 ,  1420 ,  1520 ,  1620 ,  1720 ,  1900 ,  2020 ) representative of the first collection of photos. At block  2510 , the electronic device detects, while the first image is displayed, a contact, on the touch-sensitive display. At block  2512 , the electronic device determines whether the contact has a characteristic intensity above a threshold intensity. At block  2514 , in response to a determination that the characteristic intensity is above the threshold intensity, the electronic device replaces the display of the first image with a display of a second image (e.g.,  1920 ,  2060 ) representative of the second collection of photos. 
     Note that details of the processes described above with respect to method  2500  (e.g.,  FIG. 25 ) are also applicable in an analogous manner to the methods described below. For example, methods  2200 - 2400  and  2600  may include one or more of the characteristics of the various methods described above with reference to method  2500 . For example, the user interface objects, views of an image, visual representations, and other user interface elements described above with reference to method  2500  optionally have one or more of the characteristics of the user interface objects, views of an image, visual representations, and other user interface elements described herein (e.g., methods  2200 - 2400  and  2600 ). For brevity, these details are not repeated below. 
       FIG. 26  is a flow diagram illustrating a method  2600  for accessing, navigating, and displaying photos using an electronic device in accordance with some embodiments. Method  2600  is performed at a device (e.g.,  100 ,  300 ,  500 ) with a touch-sensitive display and a rotatable input mechanism Some operations in method  2600  may be combined, the order of some operations may be changed, and some operations may be omitted. 
     As described below, method  2600  provides an intuitive way to access and view a collection of photos, which allows a user to quickly and easily locate a desired photo on a reduced size user interface. The method reduces the cognitive burden on a user when browsing a collection of photos, thereby creating a more efficient human-machine interface. For battery-operated computing devices, enabling a user to view photos more quickly and more efficiently conserves power and increases the time between battery charges. 
     At block  2602 , the electronic device receives, via wireless communication, data representing a collection of photos stored on an external device (e.g.,  650 ). At block  2604 , the electronic device displays, on the touch-sensitive display (e.g.,  112 ,  340 ,  504 ), at least one of the photos in the collection. At block  2606 , the electronic device detects a contact on the touch-sensitive display at a location of a first photo of the at least one displayed photos. At block  2608 , the electronic device determines whether the contact has a characteristic intensity above a threshold intensity. At block  2610 , in response to a determination that the characteristic intensity is above the threshold intensity, the electronic device displays a user interface menu (e.g.,  1810 ,  1840 ) including at least one user interface object, wherein the user interface object represents an option to share the first photo or display the first photo as a background of a user interface on the display of the electronic device. 
     Process  2600  provides an intuitive way to access an options menu while viewing a photo on a reduced size user interface, which allows a user to quickly and easily share the photo or set the photo as a background on the device. The method reduces the cognitive burden on a user when selecting an option associated with the photo, thereby creating a more efficient human-machine interface. For battery-operated computing devices, enabling a user to view photos more quickly and more efficiently conserves power and increases the time between battery charges. 
     Note that details of the processes described above with respect to method  2600  (e.g.,  FIG. 26 ) are also applicable in an analogous manner to the methods described below. For example, methods  2200 - 2500  may include one or more of the characteristics of the various methods described above with reference to method  2600 . For example, the user interface objects, views of an image, visual representations, and other user interface elements described above with reference to method  2600  optionally have one or more of the characteristics of the user interface objects, views of an image, visual representations, and other user interface elements described herein (e.g., methods  2200 - 2500 ). For brevity, these details are not repeated below. 
     In accordance with some embodiments,  FIG. 27  shows a functional block diagram of an electronic device  2700  configured in accordance with the principles of the various described embodiments. The functional blocks of the device are, optionally, implemented by hardware, software, or a combination of hardware and software to carry out the principles of the various described embodiments. It is understood by persons of skill in the art that the functional blocks described in  FIG. 27  are, optionally, combined or separated into sub-blocks to implement the principles of the various described embodiments. Therefore, the description herein optionally supports any possible combination or separation or further definition of the functional blocks described herein. 
     As shown in  FIG. 27 , an electronic device  2700  includes a touch-sensitive display unit  2702  configured to display a graphic user interface, a rotatable input mechanism unit  2704  configured to receive rotational input, wireless communication unit  2706  configured to transmit and receive wireless communication, and a processing unit  2708  coupled to the touch-sensitive display unit  2702 , the rotatable input mechanism unit  2704 , and the wireless communication unit  2706 . In some embodiments, the processing unit  2708  includes a receiving unit  2710 , a display enabling unit  2712 , a detecting unit  2714 , a replacement enabling unit  2716 , a transition enabling unit  2718 , a translation enabling unit  2720 , a determining unit  2722 , an animation enabling unit  2724 , and a maintaining enabling unit  2726 . 
     Processing unit  2708  is configured to receive (e.g., with receiving unit  2710 ), via wireless communication by the wireless communication unit  2706 , data representing a collection of photos stored on an external device; enable display (e.g., with display enabling unit  2712 ), on the touch-sensitive display unit  2702 , of a user interface including a user interface object, the user interface object representing the collection of photos; and detect (e.g., with detecting unit  2714 ) a first user interaction with the displayed user interface object. The processing unit  2708  is further configured to, in response to detecting the first user interaction with the displayed user interface object, enable replacement of the display (e.g., with replacement enabling unit  2716 ) of the user interface with a display of a first view of an image, the image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, where the first representation and the second representation are arranged in the image in fixed positions with respect to each other, and where, in the first view, the first representation and the second representation are displayed at a first size. The processing unit  2708  is further configured to detect (e.g., with detecting unit  2714 ) a first movement of the rotatable input mechanism unit  2704 ; and, in response to detecting the first movement of the rotatable input mechanism unit  2704 , enable transition (e.g., with transition enabling unit  2718 ) from the display of the first view of the image to a display of a second view of the image, where, in the second view, the first representation and the second representation are displayed at a second size different than the first size. 
     In some embodiments, the first size is larger than the second size. 
     In some embodiments, the first size is smaller than the second size. 
     In some embodiments, the portion of the image displayed at the center of the first view is displayed at the center of the second view. 
     In some embodiments, the image further comprises a third representation, where, in the first view, the third representation includes a visual representation of the entire third photo, and where, in the second view, the third representation includes a visual representation of less than the entire third photo. 
     In some embodiments, processing unit  2708  is further configured to detect (e.g., with detecting unit  2714 ) a first movement of a physical object on or near the touch-sensitive display unit  2702 ; and, while detecting the first movement, enable translation (e.g., with translation enabling unit  2720 ) of the image displayed on the touch-sensitive display unit  2702  in a first direction to enable display of a previously hidden edge of the image. Processing unit  2708  is further configured to, in response to display of the previously hidden edge of the image and continued detection of the first movement, enable display (e.g., by display enabling unit  2712 ) of an area beyond the edge of the image, and, after the first movement is no longer detected, enable translation (e.g., by translation enabling unit  2718 ) of the image in a second direction until the area beyond the edge of the image is no longer displayed. 
     In some embodiments, the first representation includes a first affordance, and processing unit  2708  is further configured to detect (e.g., with detecting unit  2714 ) a contact on the touch-sensitive display unit  2702  while the image is displayed, determine (e.g., with determining unit  2722 ) whether the contact represents a selection of the first affordance, and, in response to a determination that the contact represents a selection of the first affordance, enable replacement (e.g., with replacement enabling unit  2716 ) of the display of the image with a display of the first photo. 
     In some embodiments, processing unit  2708  is further configured to detect (e.g., with detecting unit  2714 ), while the first photo is displayed, a second user interaction, and, in response to detecting the second user interaction, enable replacement (e.g., with replacement enabling unit  2716 ) of the display of the first photo with a display of a fourth photo, wherein the fourth photo corresponds to a fourth representation that is adjacent to the first representation in the image. 
     In some embodiments, the second user interaction is a tap gesture on the touch-sensitive display unit  2702 . 
     In some embodiments, the second user interaction is a swipe on the touch-sensitive display unit  1702 . 
     In some embodiments, the second user interaction is a movement of the rotatable input mechanism unit  2704 . 
     In some embodiments, enabling replacement of the display of the first photo with the display of the fourth photo comprises enabling translation (e.g., with translation enabling unit  2720 ) of the display of the first photo off of the display to reveal the fourth photo displayed at a third size, and enabling transition (e.g., with transition enabling unit  2718 ) of the display of the fourth photo from the third size to a fourth size, wherein the fourth size is larger than the third size. 
     In some embodiments, enabling transition of the display of the fourth photo from the third size to the fourth size includes enabling animation (e.g., with animation enabling unit  2724 ) of the fourth photo enlarging from the third size to the fourth size. 
     In some embodiments, processing unit  2708  is further configured to, in response to a determination that the contact does not represent a selection of the first affordance, enable maintaining the display of the image on the display. 
     In some embodiments, the user interface object is an icon representing a photos application program. 
     In some embodiments, the user interface object is an icon representing an electronic folder containing the collection of photos. 
     In some embodiments, the first user interaction with the displayed user interface object is a tap gesture. 
     In some embodiments, the first representation and the second representation are thumbnail images of the corresponding photos. 
     In some embodiments, the electronic device is a wearable electronic device. 
     In some embodiments, the external device is a smartphone. 
     In some embodiments, the first representation and the second representation are arranged in a rectilinear grid pattern. 
     The operations described above with reference to  FIG. 22  are, optionally, implemented by components depicted in  FIGS. 1A-1B, and 27 . For example, the operations described with reference to blocks  2206  and/or  2208  may be implemented by event sorter  170 , event recognizer  180 , and event handler  190 . Event monitor  171  in event sorter  170  detects a contact on touch-sensitive display  112 , and event dispatcher module  174  delivers the event information to application  136 - 1 . A respective event recognizer  180  of application  136 - 1  compares the event information to respective event definitions  186 , and determines whether a first contact at a first location on the touch-sensitive surface corresponds to a predefined event or sub event, such as activation of an affordance on a user interface. When a respective predefined event or sub-event is detected, event recognizer  180  activates an event handler  190  associated with the detection of the event or sub-event. Event handler  190  may utilize or call data updater  176  or object updater  177  to update the application internal state  192 . In some embodiments, event handler  190  accesses a respective GUI updater  178  to update what is displayed by the application. Similarly, it would be clear to a person having ordinary skill in the art how other processes can be implemented based on the components depicted in  FIGS. 1A-1B, and 27 . 
     In accordance with some embodiments,  FIG. 28  shows a functional block diagram of an electronic device  2800  configured in accordance with the principles of the various described embodiments. The functional blocks of the device are, optionally, implemented by hardware, software, or a combination of hardware and software to carry out the principles of the various described embodiments. It is understood by persons of skill in the art that the functional blocks described in  FIG. 28  are, optionally, combined or separated into sub-blocks to implement the principles of the various described embodiments. Therefore, the description herein optionally supports any possible combination or separation or further definition of the functional blocks described herein. 
     As shown in  FIG. 28 , an electronic device  2800  includes a touch-sensitive display unit  2802  configured to display a graphic user interface and receive contacts, a rotatable input mechanism unit  2804  configured to receive rotational input, a wireless communication unit  2806  configured to transmit and receive wireless communication, and a processing unit  2808  coupled to the touch-sensitive display unit  2802 , the rotatable input mechanism unit  2804 , and the wireless communication unit  2806 . 
     Processing unit  2808  is configured to receive (e.g., with receiving unit  2810 ), via wireless communication by the wireless communication unit  2806 , data representing a collection of photos stored on an external device; enable display (e.g., with display enabling unit  2812 ), on the touch-sensitive display unit  2802 , of a user interface including a user interface object, the user interface object representing the collection of photos; and detect (e.g., with detecting unit  2814 ) a user interaction with the displayed user interface object. Processing unit  2808  is further configured to, in response to detecting the user interaction with the displayed user interface object, enable replacement (e.g., with replacement enabling unit  2816 ) of the display of the user interface with a display of a first view of an image, the image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, where the first representation and the second representation are arranged in the image in fixed positions with respect to each other, and where, in the first view, the first representation and the second representation are displayed at a first size. Processing unit  2808  is further configured to detect (e.g., with detecting unit  2814 ) a contact on the touch-sensitive display unit  2802  while the first view is displayed; determine (e.g., with determining unit  2820 ) whether the contact represents a selection of the first representation; and, in response to a determination that the contact represents a selection of the first representation, enable transition (e.g., with transition enabling unit  2818 ) from the display of the first view of the image to a display of a second view of the image, where, in the second view, the first representation and the second representation are displayed at a second size that is larger than the first size, and where the first representation is displayed at the center of the second view of the image. 
     In some embodiments, processing unit  2808  is further configured to, in response to a determination that the contact does not represent a selection of the first representation, enable maintaining (e.g., with maintaining enabling unit  2822 ) the display of the first view of the image on the touch-sensitive display unit  2802 . 
     In some embodiments, the user interface object is an icon representing a photos application program. 
     In some embodiments, the user interface object is an icon representing an electronic folder containing the collection of photos. 
     In some embodiments, the first user interaction with the displayed user interface object is a tap gesture. 
     In some embodiments, the first representation and the second representation are thumbnail images of the corresponding photos. 
     In some embodiments, the electronic device is a wearable electronic device. 
     In some embodiments, the external device is a smartphone. 
     In some embodiments, the first representation and the second representation are arranged in a rectilinear grid pattern. 
     The operations described above with reference to  FIG. 23  are, optionally, implemented by components depicted in  FIGS. 1A-1B, and 28 . For example, the operations described with reference to blocks  2306  and/or  2308  may be implemented by event sorter  170 , event recognizer  180 , and event handler  190 . Event monitor  171  in event sorter  170  detects a contact on touch-sensitive display  112 , and event dispatcher module  174  delivers the event information to application  136 - 1 . A respective event recognizer  180  of application  136 - 1  compares the event information to respective event definitions  186 , and determines whether a first contact at a first location on the touch-sensitive surface corresponds to a predefined event or sub event, such as activation of an affordance on a user interface. When a respective predefined event or sub-event is detected, event recognizer  180  activates an event handler  190  associated with the detection of the event or sub-event. Event handler  190  may utilize or call data updater  176  or object updater  177  to update the application internal state  192 . In some embodiments, event handler  190  accesses a respective GUI updater  178  to update what is displayed by the application. Similarly, it would be clear to a person having ordinary skill in the art how other processes can be implemented based on the components depicted in  FIGS. 1A-1B, and 28 . 
     In accordance with some embodiments,  FIG. 29  shows a functional block diagram of an electronic device  2900  configured in accordance with the principles of the various described embodiments. The functional blocks of the device are, optionally, implemented by hardware, software, or a combination of hardware and software to carry out the principles of the various described embodiments. It is understood by persons of skill in the art that the functional blocks described in  FIG. 29  are, optionally, combined or separated into sub-blocks to implement the principles of the various described embodiments. Therefore, the description herein optionally supports any possible combination or separation or further definition of the functional blocks described herein. 
     As shown in  FIG. 29 , an electronic device  2900  includes a touch-sensitive display unit  2902  configured to display a graphic user interface and receive contacts, a rotatable input mechanism unit  2904  configured to receive rotational input, a wireless communication unit  2906  configured to transmit and receive wireless communication, and a processing unit  2908  coupled to the touch-sensitive display unit  2902 , the rotatable input mechanism unit  2904 , and the wireless communication unit  2906 . 
     Processing unit  2908  configured to receive (e.g., with receiving unit  2910 ), via wireless communication by the wireless communication unit  2906 , data representing a collection of photos stored on an external device; enable display (e.g., with display enabling unit  2912 ), on the touch-sensitive display unit  2902 , of a user interface including a user interface object, the user interface object representing the collection of photos; detect (e.g., with detecting unit  2914 ) a user interaction with the displayed user interface object. Processing unit  2908  is further configured to, in response to detecting the user interaction with the displayed user interface object, enable replacement (e.g., with replacement enabling unit  2916 ) of the display of the user interface with an image comprising a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, where the first representation and the second representation are arranged in the image in fixed positions with respect to each other; detect (e.g., with detecting unit  2914 ) a first point of contact of a contact on the touch-sensitive display unit  2902 , wherein the first point of contact corresponds to a first location on the image; determine (e.g., with determining unit  2920 ) whether the duration of the contact exceeds a predetermined threshold; and, in response to a determination that the duration of the contact exceeds the predetermined threshold, enable display (e.g., with display enabling unit  2912 ) of an enlarged view of a portion of the image surrounding or adjacent to the first location. 
     In some embodiments, processing unit  2908  is further configured to detect (e.g., with detecting unit  2914 ) a translation of the contact along the touch-sensitive display unit  2902  to a second point of contact corresponding to a second location on the image; and in response to detecting the translation of the contact to the second point of contact, enable replacement (e.g., with replacement enabling unit  2916 ) of the display of the enlarged view of the portion of the image surrounding or adjacent to the first location with an enlarged view of a portion of the image surrounding or adjacent to the second location. 
     In some embodiments, the enlarged view includes a circular display of the portion of the image. 
     In some embodiments, the first location is associated with the first representation, and the enlarged view is an image of the first photo. 
     In some embodiments, the enlarged view is displayed above the point of contact on the touch-sensitive display unit  2902 . 
     In some embodiments, processing unit  2908  is further configured to, in response to a determination that the duration of the contact does not exceed the predetermined threshold, enable maintaining (e.g., with maintaining enabling unit  2922 ) the display of the image on the touch-sensitive display unit  2902 . 
     In some embodiments, processing unit  2908  is further configured to, in response to a determination that the duration of the contact does not exceed the predetermined threshold, enable replacement (e.g., with replacement enabling unit  2916 ) of the display of the image with a display of a photo corresponding to the first location on the image. 
     In some embodiments, processing unit  2908  is further configured to, in response to a determination that the duration of the contact does not exceed the predetermined threshold, enable transition (e.g., with transition enabling unit  2918 ) from the display of the image to a zoomed-in view of the image centered on the first location on the image. 
     In some embodiments, the user interface object is an icon representing a photos application program. 
     In some embodiments, the user interface object is an icon representing an electronic folder containing the collection of photos. 
     In some embodiments, the first user interaction with the displayed user interface object is a tap gesture. 
     In some embodiments, the first representation and the second representation are thumbnail images of the corresponding photos. 
     In some embodiments, the electronic device is a wearable electronic device. 
     In some embodiments, the external device is a smartphone. 
     In some embodiments, the first representation and the second representation are arranged in a rectilinear grid pattern. 
     The operations described above with reference to  FIG. 24  are, optionally, implemented by components depicted in  FIGS. 1A-1B, and 29 . For example, the operations described with reference to blocks  2406 ,  2408 ,  2410 ,  2412 , and/or  2414  may be implemented by event sorter  170 , event recognizer  180 , and event handler  190 . Event monitor  171  in event sorter  170  detects a contact on touch-sensitive display  112 , and event dispatcher module  174  delivers the event information to application  136 - 1 . A respective event recognizer  180  of application  136 - 1  compares the event information to respective event definitions  186 , and determines whether a first contact at a first location on the touch-sensitive surface corresponds to a predefined event or sub event, such as activation of an affordance on a user interface. When a respective predefined event or sub-event is detected, event recognizer  180  activates an event handler  190  associated with the detection of the event or sub-event. Event handler  190  may utilize or call data updater  176  or object updater  177  to update the application internal state  192 . In some embodiments, event handler  190  accesses a respective GUI updater  178  to update what is displayed by the application. Similarly, it would be clear to a person having ordinary skill in the art how other processes can be implemented based on the components depicted in  FIGS. 1A-1B, and 29 . 
     In accordance with some embodiments,  FIG. 30  shows a functional block diagram of an electronic device  3000  configured in accordance with the principles of the various described embodiments. The functional blocks of the device are, optionally, implemented by hardware, software, or a combination of hardware and software to carry out the principles of the various described embodiments. It is understood by persons of skill in the art that the functional blocks described in  FIG. 30  are, optionally, combined or separated into sub-blocks to implement the principles of the various described embodiments. Therefore, the description herein optionally supports any possible combination or separation or further definition of the functional blocks described herein. 
     As shown in  FIG. 30 , an electronic device  3000  includes a touch-sensitive display unit  3002  configured to display a graphic user interface and receive contacts, where the touch-sensitive display unit  3002  comprises one or more intensity sensor units  3022  to detect the intensity of contacts with the touch-sensitive display unit  3002 , a rotatable input mechanism unit  3004  configured to receive rotational input, a wireless communication unit  3006  configured to transmit and receive wireless communication, and a processing unit  3008  coupled to the touch-sensitive display unit  3002 , the one or more intensity sensor units  3022 , the rotatable input mechanism unit  3004 , and the wireless communication unit  3006 . 
     Processing unit  3008  is configured to receive (e.g., with receiving unit  3010 ), via wireless communication by the wireless communication unit  3006 , data representing a first collection of photos and a second collection photos, wherein the first and second collections are stored on an external device; enable display (e.g., with display enabling unit  3012 ), on the touch-sensitive display unit  3002 , of a user interface including a user interface object representing the first collection; detect (e.g., with detecting unit  3014 ) a user interaction with the user interface object; in response to detecting the user interaction with the user interface object, enable replacement (e.g., with replacement enabling unit  3016 ) of the display of the user interface with a display of a first image representative of the first collection of photos; detect (e.g., with detecting unit  3014 ), while the first image is displayed, a contact on the touch-sensitive display unit  3002 ; determine (e.g., with determining unit  3020 ) whether the contact has a characteristic intensity above a threshold intensity; and in response to a determination that the characteristic intensity is above the threshold intensity, enable replacement (e.g., with replacement enabling unit  3016 ) of the display of the first image with a display of a second image representative of the second collection of photos. 
     In some embodiments, the first image includes a first cover image indicative of the first collection of photos, and the second image includes a second cover image indicative of the second collection of photos. 
     In some embodiments, the first image comprises a first representation including a visual representation of a first photo in the collection of photos and a second representation including a visual representation of a second photo in the collection of photos, where the first representation and the second representation are arranged in the first image in fixed positions with respect to each other, and where the second image comprises a third representation including a visual representation of a third photo in the second collection of photos and a fourth representation including a visual representation of a fourth photo in the second collection of photos, where the third representation and the fourth representation are arranged in the second image in fixed positions with respect to each other. 
     In some embodiments, processing unit  3008  is further configured to in response to a determination that the characteristic intensity is not above the threshold intensity, enable transition (e.g., with transition enabling unit  3018 ) from the display of the first image to a zoomed-in view of the first image. 
     In some embodiments, processing unit  3008  is further configured to, in response to a determination that the characteristic intensity is not above the threshold intensity, enable replacement (e.g., with replacement enabling unit  3016 ) of the display of the first image with a display of a photo in the first collection of photos. 
     In some embodiments, the first representation, the second representation, the third representation, and the fourth representation are thumbnail images of the corresponding photos. 
     In some embodiments, the first representation and the second representation are arranged in a rectilinear grid pattern in the first image, and the third representation and the fourth representation are arranged in a rectilinear grid pattern in the second image. 
     In some embodiments, the user interface object is an icon representing a photos application program. 
     In some embodiments, the user interface object is an icon representing an electronic folder containing the collection of photos. 
     In some embodiments, the first user interaction with the displayed user interface object is a tap gesture. 
     In some embodiments, the electronic device is a wearable electronic device. 
     In some embodiments, the external device is a smartphone. 
     The operations described above with reference to  FIG. 25  are, optionally, implemented by components depicted in  FIGS. 1A-1B, and 30 . For example, the operations described with reference to blocks  2506 ,  2508 ,  2510 ,  2512 , and/or  2514  may be implemented by event sorter  170 , event recognizer  180 , and event handler  190 . Event monitor  171  in event sorter  170  detects a contact on touch-sensitive display  112 , and event dispatcher module  174  delivers the event information to application  136 - 1 . A respective event recognizer  180  of application  136 - 1  compares the event information to respective event definitions  186 , and determines whether a first contact at a first location on the touch-sensitive surface corresponds to a predefined event or sub event, such as activation of an affordance on a user interface. When a respective predefined event or sub-event is detected, event recognizer  180  activates an event handler  190  associated with the detection of the event or sub-event. Event handler  190  may utilize or call data updater  176  or object updater  177  to update the application internal state  192 . In some embodiments, event handler  190  accesses a respective GUI updater  178  to update what is displayed by the application. Similarly, it would be clear to a person having ordinary skill in the art how other processes can be implemented based on the components depicted in  FIGS. 1A-1B, and 30 . 
     In accordance with some embodiments,  FIG. 31  shows a functional block diagram of an electronic device  3100  configured in accordance with the principles of the various described embodiments. The functional blocks of the device are, optionally, implemented by hardware, software, or a combination of hardware and software to carry out the principles of the various described embodiments. It is understood by persons of skill in the art that the functional blocks described in  FIG. 31  are, optionally, combined or separated into sub-blocks to implement the principles of the various described embodiments. Therefore, the description herein optionally supports any possible combination or separation or further definition of the functional blocks described herein. 
     As shown in  FIG. 31 , an electronic device  3100  includes a touch-sensitive display unit  3102  configured to display a graphic user interface and receive contacts, where the touch-sensitive display unit  3102  comprises one or more intensity sensor units  3122  to detect the intensity of contacts with the touch-sensitive display unit  3102 , a rotatable input mechanism unit  3104  configured to receive rotational input, a wireless communication unit  3106  configured to transmit and receive wireless communication, and a processing unit  3108  coupled to the touch-sensitive display unit  3102 , the one or more intensity sensor units  3122 , the rotatable input mechanism unit  3104 , and the wireless communication unit  3106 . 
     Processing unit  3108  is configured to receive (e.g., with receiving unit  3110 ), via wireless communication by the wireless communication unit  3106 , data representing a collection of photos stored on an external device; enable display (e.g., with display enabling unit  3112 ), on the touch-sensitive display unit  3102 , of at least one of the photos in the collection; detect (e.g., with detecting unit  3114 ) a contact on the touch-sensitive display unit  3102  at a location of a first photo of the at least one displayed photos; determine (e.g., with determining unit  3118 ) whether the contact has a characteristic intensity above a threshold intensity; and in response to a determination that the characteristic intensity is above the threshold intensity, enable display (e.g., with display enabling unit  3112 ) of a user interface menu including at least one user interface object, where the user interface object represents an option to share the first photo or display the first photo as a background of a user interface on the display of the electronic device. 
     In some embodiments, the user interface comprises the background, a first user interface object indicating a time of day, and a second user interface object indicating a date, wherein the appearance of the second user interface object is blended with the background. 
     In some embodiments, processing unit  3108  is further configured to, in response to a determination that the characteristic intensity is not above the threshold intensity, enable maintaining (e.g., with maintaining enabling unit  3120 ) the display of the at least one of the photos in the collection of photos. 
     In some embodiments, the at least one of the photos in the collection is a first photo, and processing unit  3108  is further configured to, in response to a determination that the characteristic intensity is not above the threshold intensity, enable replacement (e.g., with replacement enabling unit  3116 ) of the display of the first photo with a display of a second photo in the collection of photos. 
     In some embodiments, the electronic device is a wearable electronic device. 
     In some embodiments, the external device is a smartphone. 
     The operations described above with reference to  FIG. 26  are, optionally, implemented by components depicted in  FIGS. 1A-1B, and 31 . For example, the operations described with reference to blocks  2606 ,  2608 , and/or  2610  may be implemented by event sorter  170 , event recognizer  180 , and event handler  190 . Event monitor  171  in event sorter  170  detects a contact on touch-sensitive display  112 , and event dispatcher module  174  delivers the event information to application  136 - 1 . A respective event recognizer  180  of application  136 - 1  compares the event information to respective event definitions  186 , and determines whether a first contact at a first location on the touch-sensitive surface corresponds to a predefined event or sub event, such as activation of an affordance on a user interface. When a respective predefined event or sub-event is detected, event recognizer  180  activates an event handler  190  associated with the detection of the event or sub-event. Event handler  190  may utilize or call data updater  176  or object updater  177  to update the application internal state  192 . In some embodiments, event handler  190  accesses a respective GUI updater  178  to update what is displayed by the application. Similarly, it would be clear to a person having ordinary skill in the art how other processes can be implemented based on the components depicted in  FIGS. 1A-1B, and 31 . 
       FIGS. 32A-32D  is a flow diagram illustrating a method  3200  for accessing, navigating, and displaying photos using an electronic device in accordance with some embodiments. Method  3200  is performed at a device (e.g.,  100 ,  300 ,  500 ) with a touch-sensitive display, a motion sensor, and a rotatable input mechanism. Some operations in method  3200  may be combined, the order of some operations may be changed, and some operations may be omitted. 
     As described below, method  3200  provides an intuitive way to use a sequence of images for displaying a background of a user interface. The method reduces the cognitive burden on a user when interacting with the background, thereby creating a more efficient human-machine interface. For battery-operated computing devices, enabling a user to view photos more quickly and more efficiently conserves power and increases the time between battery charges. 
     At block  3202 , the device receives, via wireless communication, data representing a sequence of images (e.g., sequence  1780 ) stored on an external device. At block  3204 , the device displays, on the touch-sensitive display, a representation (e.g.,  1721 ) of the sequence of images. At block  3206 , the device detects a contact (e.g., touch  1705 ) on the touch-sensitive display at a location of the representation of the sequence of images. At block  3208 , the device determines whether the contact has a characteristic intensity above a threshold intensity. At block  3210 , in response to a determination that the characteristic intensity is above the threshold intensity, the device displays a user interface menu (e.g.,  1770 ) including a user interface object, where the user interface object represents an option to display a background of a user interface on the display of the electronic device based on the sequence of images. At block  3212 , the device detects a selection of the user interface object. At block  3214 , the device detects, with the motion sensor, a motion indicative of a wrist raise gesture. At block  3216 , in response to detecting the motion indicative of a wrist raise gesture, the device displays the background of the user interface on the display of the electronic device based on the sequence of images. 
     At block  3218 , the sequence of images includes a first image, a last image, and a representative image, and displaying the background based on the sequence of images includes: displaying, in sequence, a first set of one or more images from the sequence of images that are positioned before the representative image and the representative image. At block  3220 , after displaying the first set of images, the device detects a user input including a first portion and a second portion after the first portion. At block  3222 , in response to the first portion of the user input, the device displays, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image. At block  3224 , in response to the second portion of the user input, the device displays, in sequence, a third set of one or more images from the sequence of images that are positioned after the representative image and displays the last image, wherein the one or more images of the second set of images are positioned before the one or more images of the third set of images. 
     At block  3226 , the sequence of images includes a first image, a last image, and a representative image, and displaying the background based on the sequence of images includes: displaying, in sequence, the representative image and a first set of one or more images from the sequence of images that are positioned after the representative image including the last image. At block  3228 , after displaying the first set of images, the device detects a user input including a first portion and a second portion after the first portion. At block  3230 , in response to the first portion of the user input, the device displays, in sequence, a second set of one or more images from the sequence of images that are positioned before the representative image. At block  3232 , in response to the second portion of the user input, the device displays, in sequence, a third set of one or more images from the sequence of images that are positioned before or include the representative image, wherein the one or more images of the second set are positioned before the one or more images of the third set, the second set includes the first image, and the third set includes the representative image. 
     At block  3234 , the sequence of images includes a first image, a last image, and a representative image, and displaying the background based on the sequence of images includes: displaying, in sequence, a first set of images from the sequence of images including the representative image, one or more images positioned after the representative image, one or more images positioned before the representative image, and the representative image. At block  3236 , after displaying the first set of images, the device detects a user input including a first portion and a second portion after the first portion. At block  3238 , in response to the first portion of the user input, the device displays, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image. At block  3240 , in response to the second portion of the user input, the device displays, in sequence, a third set of one or more images from the sequence of images that are positioned after the representative image and display the last image, wherein the one or more images of the second set of images is before the one or more images of the third set of images. 
     Note that details of the processes described above with respect to method  3200  (e.g.,  FIG. 32 ) are also applicable in an analogous manner to the methods described above. For example, methods  2200 - 2600  may include one or more of the characteristics of the various methods described with reference to method  3200 . 
     In accordance with some embodiments,  FIG. 33  shows a functional block diagram of an electronic device  3300  configured in accordance with the principles of the various described embodiments. The functional blocks of the device are, optionally, implemented by hardware, software, or a combination of hardware and software to carry out the principles of the various described embodiments. It is understood by persons of skill in the art that the functional blocks described in  FIG. 33  are, optionally, combined or separated into sub-blocks to implement the principles of the various described embodiments. Therefore, the description herein optionally supports any possible combination or separation or further definition of the functional blocks described herein. 
     As shown in  FIG. 33 , an electronic device  3300  includes a touch-sensitive display unit  3302  configured to display a graphic user interface and receive contacts, a rotatable input mechanism unit  3304  configured to receive rotational input, a wireless communication unit  3306  configured to transmit and receive wireless communication, a motion sensor unit  3308  configured to sense motion indicative of a wrist raise gesture, and a processing unit  3310  coupled to the touch-sensitive display unit  3302 , the rotatable input mechanism unit  3304 , the wireless communication unit  3306 , and the motions sensor unit  3308 . In some embodiments, the processing unit  3310  optionally includes a receiving unit  3312 , a display enabling unit  3314 , a detecting unit  3316 , and a determining unit  3318 . 
     Processing unit  3310  is configured to receive (e.g., with receiving unit  3312 ), via the wireless communication unit  3306 , data representing a sequence of images stored on an external device; enable (e.g., with display enabling unit  3314 ), on the touch-sensitive display unit, display of a representation of the sequence of images; detect (e.g., with detecting unit  3316 ) a contact on the touch-sensitive display unit at a location of the representation of the sequence of images; determine (e.g., with determining unit  3318 ) whether the contact has a characteristic intensity above a threshold intensity; in response to a determination that the characteristic intensity is above the threshold intensity, enable (e.g., with display enabling unit  3314 ) display of a user interface menu including a user interface object, where the user interface object represents an option to display a background of a user interface on the touch-sensitive display unit of the electronic device based on the sequence of images; detect (e.g., with detecting unit  3316 ) a selection of the user interface object; detect (e.g., with detecting unit  3316 ), with motion sensor unit  3308 , a motion indicative of a wrist raise gesture; and in response to detecting the motion indicative of a wrist raise gesture, enable (e.g., with display enabling unit  3314 ) display of the background of the user interface on the touch-sensitive display unit of the electronic device based on the sequence of images. 
     In some embodiments, the sequence of images includes a first image, a last image, and a representative image, and enabling display of the background based on the sequence of images includes enabling display of, in sequence, a first set of one or more images from the sequence of images that are positioned before the representative image and the representative image. 
     In some embodiments, processing unit  3310  is further configured to: after enabling display of the first set of images, detect (e.g., with detecting unit  3316 ) a user input; and in response to detecting the user input, enable (e.g., with display enabling unit  3314 ) display of, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image including the last image. 
     In some embodiments, processing unit  3310  is further configured to: after enabling display of the first set of images, detect (e.g., with detecting unit  3316 ) a user input including a first portion and a second portion after the first portion; in response to the first portion of the user input, enable (e.g., with display enabling unit  3314 ) display of, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image; and in response to the second portion of the user input, enable (e.g., with display enabling unit  3314 ) display of, in sequence, a third set of one or more images from the sequence of images that are positioned after the representative image and the last image, where the one or more images of the second set of images are positioned before the one or more images of the third set of images. 
     In some embodiments, processing unit  3310  is further configured to: after enabling display of the first set of images, detect (e.g., with detecting unit  3316 ) a rotation of the rotatable input mechanism; in response to the rotation of the rotatable input mechanism, enable (e.g., with display enabling unit  3314 ) replacement of the display of the representative image with a second image from the sequence of images; detect (e.g., with detecting unit  3316 ) a second user input representing a selection of the second image as the representative image; after detecting the second user input representing a selection of the second image as the representative image, detect (e.g., with detecting unit  3316 ), with motion sensor unit  3308 , a second motion indicative of a wrist raise gesture; and in response to detecting the second motion indicative of a wrist raise gesture, enable (e.g., with display enabling unit  3314 ) display of the background of the user interface on the display of the electronic device based on the sequence of images with the second image as the representative image. 
     In some embodiments, the sequence of images includes a first image, a last image, and a representative image, and enabling display of the background based on the sequence of images includes enabling display of, in sequence, the representative image and a first set of one or more images from the sequence of images that are positioned after the representative image including the last image. 
     In some embodiments, processing unit  3310  is further configured to: after enabling display of the first set of images, detect (e.g., with detecting unit  3316 ) a user input; and in response to detecting the user input, enable (e.g., with display enabling unit  3314 ) display of, in sequence, a second set of one or more images from the sequence of images that are positioned before the representative image and the representative image. 
     In some embodiments, processing unit  3310  is further configured to: after enabling display of the first set of images, detect (e.g., with detecting unit  3316 ) a user input including a first portion and a second portion after the first portion; in response to the first portion of the user input, enable (e.g., with display enabling unit  3314 ) display of, in sequence, a second set of one or more images from the sequence of images that are positioned before the representative image; and in response to the first portion of the user input, display, in sequence, a third set of one or more images from the sequence of images that are positioned before or include the representative image, where the one or more images of the second set are positioned before the one or more images of third set, the second set includes the first image, and the third set includes the representative image. 
     In some embodiments, processing unit  3310  is further configured to: after enabling display of the first set of images, detect (e.g., with detecting unit  3316 ) a rotation of the rotatable input mechanism; in response to the rotation of the rotatable input mechanism, enable (e.g., with display enabling unit  3314 ) replacement of the display of the last image with a second image from the sequence of images; detect (e.g., with detecting unit  3316 ) a second user input representing a selection of the second image as the representative image; after detecting the second user input representing a selection of the second image as the representative image, detect (e.g., with detecting unit  3316 ), with motion sensor unit  3308 , a second motion indicative of a wrist raise gesture; and in response to detecting the second motion indicative of a wrist raise gesture, enable (e.g., with display enabling unit  3314 ) display of the background of the user interface on the display of the electronic device based on the sequence of images with the second image as the representative image. 
     In some embodiments, the sequence of images includes a first image, a last image, and a representative image, and enabling display of the background based on the sequence of images includes enabling display of, in sequence, a first set of images from the sequence of images including the representative image, one or more images positioned after the representative image, one or more images positioned before the representative image, and the representative image. 
     In some embodiments, processing unit  3310  is further configured to: after enabling display of the first set of images, detect (e.g., with detecting unit  3316 ) a user input; and in response to detecting the user input, enable (e.g., with display enabling unit  3314 ) display of, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image including the last image. 
     In some embodiments, processing unit  3310  is further configured to: after enabling display of the first set of images, detect (e.g., with detecting unit  3316 ) a user input including a first portion and a second portion after the first portion; in response to the first portion of the user input, enable (e.g., with display enabling unit  3314 ) display of, in sequence, a second set of one or more images from the sequence of images that are positioned after the representative image; and in response to the second portion of the user input, enable (e.g., with display enabling unit  3314 ) display of, in sequence, a third set of one or more images from the sequence of images that are positioned after the representative image and the last image, where the one or more images of the second set of images is before the one or more images of the third set of images. 
     In some embodiments, processing unit  3310  is further configured to: after enabling display of the first set of images, detect (e.g., with detecting unit  3316 ) a rotation of the rotatable input mechanism; in response to the rotation of the rotatable input mechanism, enable (e.g., with display enabling unit  3314 ) replacement of the display of the representative image with a second image from the sequence of images; detect (e.g., with detecting unit  3316 ) a second user input representing a selection of the second image as the representative image; after detecting the second user input representing a selection of the second image as the representative image, detect (e.g., with detecting unit  3316 ), with motion sensor unit  3308 , a second motion indicative of a wrist raise gesture; and in response to detecting the second motion indicative of a wrist raise gesture, enable (e.g., with display enabling unit  3314 ) display of the background of the user interface on the display of the electronic device based on the sequence of images with the second image as the representative image. 
     In some embodiments, the user interface comprises the background, a first user interface object indicating a time of day, and a second user interface object indicating a date. In some embodiments, the appearance of the second user interface object is blended with the background. 
     The operations described above with reference to  FIG. 32  are, optionally, implemented by components depicted in  FIGS. 1A-1B, and 33 . For example, operations described with reference to  FIG. 32  may be implemented by event sorter  170 , event recognizer  180 , and event handler  190 . Event monitor  171  in event sorter  170  detects a contact on touch-sensitive display  112 , and event dispatcher module  174  delivers the event information to application  136 - 1 . A respective event recognizer  180  of application  136 - 1  compares the event information to respective event definitions  186 , and determines whether a first contact at a first location on the touch-sensitive surface corresponds to a predefined event or sub event, such as activation of an affordance on a user interface. When a respective predefined event or sub-event is detected, event recognizer  180  activates an event handler  190  associated with the detection of the event or sub-event. Event handler  190  may utilize or call data updater  176  or object updater  177  to update the application internal state  192 . In some embodiments, event handler  190  accesses a respective GUI updater  178  to update what is displayed by the application. Similarly, it would be clear to a person having ordinary skill in the art how other processes can be implemented based on the components depicted in  FIGS. 1A-1B . 
     The foregoing description, for purpose of explanation, has been described with reference to specific embodiments. However, the illustrative discussions above are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in view of the above teachings. The embodiments were chosen and described in order to best explain the principles of the techniques and their practical applications. Others skilled in the art are thereby enabled to best utilize the techniques and various embodiments with various modifications as are suited to the particular use contemplated. 
     Although the disclosure and examples have been fully described with reference to the accompanying drawings, it is to be noted that various changes and modifications will become apparent to those skilled in the art. Such changes and modifications are to be understood as being included within the scope of the disclosure and examples as defined by the claims.

Metadata:
Filing Date: 20150828
Publication Date: 20180911
Grant Date: 20180911
Priority Date: 20140902
Inventors: DASCOLA, JONATHAN R.
FOSS, CHRISTOPHER PATRICK
YANG, LAWRENCE Y.
DYE, ALAN C.
GRAHAM, DAVID CHANCE
IVE, JONATHAN P.
LYNCH, KEVIN
HOWARD, JAMES
AGNOLI, GIOVANNI M.
WILSON, ERIC LANCE
WILSON, CHRISTOPHER
MEININGER, Jeffrey
Assignee: APPLE INC
CPC Classifications: [{"code": "G06F2203/04806", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/0362", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0488", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0362", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/017", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0482", "inventive": true, "first": true, "tree": "[]"}, {"code": "G06F3/04842", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/04847", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/04845", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F2203/04806", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/04847", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F2203/04806", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/0488", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/04842", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/04845", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/017", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0482", "inventive": true, "first": true, "tree": "[]"}, {"code": "G06F3/0362", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0488", "inventive": true, "first": true, "tree": "[]"}]
Family ID: 54207672