text: // Copyright 2008 The Closure Library Authors. All Rights Reserved.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS-IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  /**
   * @fileoverview SpriteInfo implementation. This is a simple wrapper class to
   * hold CSS metadata needed for sprited emoji.
   *
   * @see ../demos/popupemojipicker.html or emojipicker_test.html for examples
   * of how to use this class.
   *
   */
  goog.provide('goog.ui.emoji.SpriteInfo');
  
  
  
  /**
   * Creates a SpriteInfo object with the specified properties. If the image is
   * sprited via CSS, then only the first parameter needs a value. If the image
   * is sprited via metadata, then the first parameter should be left null.
   *
   * @param {?string} cssClass CSS class to properly display the sprited image.
   * @param {string=} opt_url Url of the sprite image.
   * @param {number=} opt_width Width of the image being sprited.
   * @param {number=} opt_height Height of the image being sprited.
   * @param {number=} opt_xOffset Positive x offset of the image being sprited
   *     within the sprite.
   * @param {number=} opt_yOffset Positive y offset of the image being sprited
   *     within the sprite.
   * @param {boolean=} opt_animated Whether the sprite is animated.
   * @constructor
   * @final
   */
  goog.ui.emoji.SpriteInfo = function(
      cssClass, opt_url, opt_width, opt_height, opt_xOffset, opt_yOffset,
      opt_animated) {
    if (cssClass != null) {
      this.cssClass_ = cssClass;
    } else {
      if (opt_url == undefined || opt_width === undefined ||
          opt_height === undefined || opt_xOffset == undefined ||
          opt_yOffset === undefined) {
        throw Error('Sprite info is not fully specified');
      }
  
      this.url_ = opt_url;
      this.width_ = opt_width;
      this.height_ = opt_height;
      this.xOffset_ = opt_xOffset;
      this.yOffset_ = opt_yOffset;
    }
  
    this.animated_ = !!opt_animated;
  };
  
  
  /**
   * Name of the CSS class to properly display the sprited image.
   * @type {string}
   * @private
   */
  goog.ui.emoji.SpriteInfo.prototype.cssClass_;
  
  
  /**
   * Url of the sprite image.
   * @type {string|undefined}
   * @private
   */
  goog.ui.emoji.SpriteInfo.prototype.url_;
  
  
  /**
   * Width of the image being sprited.
   * @type {number|undefined}
   * @private
   */
  goog.ui.emoji.SpriteInfo.prototype.width_;
  
  
  /**
   * Height of the image being sprited.
   * @type {number|undefined}
   * @private
   */
  goog.ui.emoji.SpriteInfo.prototype.height_;
  
  
  /**
   * Positive x offset of the image being sprited within the sprite.
   * @type {number|undefined}
   * @private
   */
  goog.ui.emoji.SpriteInfo.prototype.xOffset_;
  
  
  /**
   * Positive y offset of the image being sprited within the sprite.
   * @type {number|undefined}
   * @private
   */
  goog.ui.emoji.SpriteInfo.prototype.yOffset_;
  
  
  /**
   * Whether the emoji specified by the sprite is animated.
   * @type {boolean}
   * @private
   */
  goog.ui.emoji.SpriteInfo.prototype.animated_;
  
  
  /**
   * Returns the css class of the sprited image.
   * @return {?string} Name of the CSS class to properly display the sprited
   *     image.
   */
  goog.ui.emoji.SpriteInfo.prototype.getCssClass = function() {
    return this.cssClass_ || null;
  };
  
  
  /**
   * Returns the url of the sprite image.
   * @return {?string} Url of the sprite image.
   */
  goog.ui.emoji.SpriteInfo.prototype.getUrl = function() {
    return this.url_ || null;
  };
  
  
  /**
   * Returns whether the emoji specified by this sprite is animated.
   * @return {boolean} Whether the emoji is animated.
   */
  goog.ui.emoji.SpriteInfo.prototype.isAnimated = function() {
    return this.animated_;
  };
  
  
  /**
   * Returns the width of the image being sprited, appropriate for a CSS value.
   * @return {string} The width of the image being sprited.
   */
  goog.ui.emoji.SpriteInfo.prototype.getWidthCssValue = function() {
    return goog.ui.emoji.SpriteInfo.getCssPixelValue_(this.width_);
  };
  
  
  /**
   * Returns the height of the image being sprited, appropriate for a CSS value.
   * @return {string} The height of the image being sprited.
   */
  goog.ui.emoji.SpriteInfo.prototype.getHeightCssValue = function() {
    return goog.ui.emoji.SpriteInfo.getCssPixelValue_(this.height_);
  };
  
  
  /**
   * Returns the x offset of the image being sprited within the sprite,
   * appropriate for a CSS value.
   * @return {string} The x offset of the image being sprited within the sprite.
   */
  goog.ui.emoji.SpriteInfo.prototype.getXOffsetCssValue = function() {
    return goog.ui.emoji.SpriteInfo.getOffsetCssValue_(this.xOffset_);
  };
  
  
  /**
   * Returns the positive y offset of the image being sprited within the sprite,
   * appropriate for a CSS value.
   * @return {string} The y offset of the image being sprited within the sprite.
   */
  goog.ui.emoji.SpriteInfo.prototype.getYOffsetCssValue = function() {
    return goog.ui.emoji.SpriteInfo.getOffsetCssValue_(this.yOffset_);
  };
  
  
  /**
   * Returns a string appropriate for use as a CSS value. If the value is zero,
   * then there is no unit appended.
   *
   * @param {number|undefined} value A number to be turned into a
   *     CSS size/location value.
   * @return {string} A string appropriate for use as a CSS value.
   * @private
   */
  goog.ui.emoji.SpriteInfo.getCssPixelValue_ = function(value) {
    return !value ? '0' : value + 'px';
  };
  
  
  /**
   * Returns a string appropriate for use as a CSS value for a position offset,
   * such as the position argument for sprites.
   *
   * @param {number|undefined} posOffset A positive offset for a position.
   * @return {string} A string appropriate for use as a CSS value.
   * @private
   */
  goog.ui.emoji.SpriteInfo.getOffsetCssValue_ = function(posOffset) {
    var offset = goog.ui.emoji.SpriteInfo.getCssPixelValue_(posOffset);
    return offset == '0' ? offset : '-' + offset;
  };
  