Animated Floating Action Button in kivy - Python - GeeksforGeeks

19 Oct, 2021
Kivy is a platform independent GUI tool in Python. As it can be run on Android, IOS, linux and Windows etc. It is basically used to develop the Android application, but it does not mean that it can not be used on Desktops applications.In this article we will learn about how can we Add the Animation to a Floating Action button. To learn How to create it you must know about the Animation and Clock. 
Animation : Animation and AnimationTransition are used to animate Widget properties. You must specify at least a property name and target value. To use an Animation, follow these steps: 
Setup an Animation object
Use the Animation object on a Widget
To animate a Widget’s x or y position, simply specify the target x/y values where you want the widget positioned at the end of the animation:  
anim = Animation(x=100, y=100)
anim.start(widget)
Clock: The Clock object allows you to schedule a function call in the future; once or repeatedly at specified intervals.It is must to use kivy inbuilt module while working with Animation and clock –  
from kivy.animation import Animation
from kivy.clock import Clock
 
Basic Approach:

1) import kivy
2) import kivyApp
3) import Boxlayout
4) import Animation
5) Import Clock
6) Set minimum version(optional)
7) create Layout class and Add(create) animation in it
8) create App class
9) Set up .kv file :
       1) Add Floating Button Properties
       2) Create Main Window
       3) Add Float Button(don't forget to give id)
10) return Layout/widget/Class(according to requirement)
11) Run an instance of the class
 
Kivy Tutorial – Learn Kivy with Examples.
Implementation of the Approach:main.py file  
Python3
## Sample Python application demonstrating that## How to create a button like floating Action Button## in Kivy using .kv file   #################################################### import modules   import kivy   # base Class of your App inherits from the App class.  # app:always refers to the instance of your application from kivy.app import App   # BoxLayout arranges widgets in either# in a vertical fashion that# is one on top of another or in a horizontal# fashion that is one after another.from kivy.uix.boxlayout import BoxLayout   # To change the kivy default settings # we use this module config from kivy.config import Config       # 0 being off 1 being on as in true / false # you can use 0 or 1 && True or False Config.set('graphics', 'resizable', True) # The Clock object allows you to# schedule a function call in the futurefrom kivy.clock import Clock # To work with Animation you must have to import itfrom kivy.animation import Animation # creating the root widget used in .kv fileclass MainWindow(BoxLayout):    def __init__(self, **kwargs):        super().__init__(**kwargs)         # Schedule the interval for the animation        Clock.schedule_interval(self.breath, 1)     # Creating Animation function name breath    def breath(self, dtx):         # create an animation object. This object could be stored        # and reused each call or reused across different widgets.        # += is a sequential step        anim = (Animation(btn_size =(60, 60), t ='in_quad', duration =.5)+               Animation(btn_size =(70, 70), t ='in_quad', duration =.5))         # Call the button id        tgt = self.ids.cta         # Start the Animation        anim.start(tgt)  # creating the App class in which name#.kv file is to be named main.kvclass MainApp(App):    # defining build()    def build(self):        # returning the instance of root class        return MainWindow() # run the appif __name__ == '__main__':    MainApp().run()
.kv file  
Python3
#.kv file implementation of BoxLayout  # using Float Layout for the creation of Floatbutton# Here we are creating the properties of button# Button will be created in Main window Box Layout <FloatButton@FloatLayout>    id: float_root  # Giving id to button    size_hint: (None, None)    text: ''    btn_size: (70, 70)    size: (70, 70)    bg_color: (0.404, 0.227, 0.718, 1.0)    pos_hint: {'x': .6}     # Adding shape and all, size, position to button    Button:        text: float_root.text        markup: True        font_size: 40        size_hint: (None, None)        size: float_root.btn_size        pos_hint: {'x': 5.5, 'y': 3.8}        background_normal: ''        background_color: (0, 0, 0, 0)        canvas.before:            Color:                rgba: (0.404, 0.227, 0.718, 1.0)            Ellipse:                size: self.size                pos: self.pos         # Creation of main window<MainWindow>:    BoxLayout:        # Creating the Float button        FloatButton:             # Giving id to the button            # So that we can Apply the Animation            id: cta            text: '+'            markup: True            background_color: 1, 0, 1, 0
Output: 
 
Video Output:  
 
saurabh1990aror
Python-gui
Python-kivy
Python
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