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73bcce88   luigser   COMPONENTS 
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  <!--
  @license
  Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
  This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
  The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
  The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
  Code distributed by Google as part of the polymer project is also
  subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  -->
c5169e0e   Renato De Donato   a new hope 
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  <link rel="import" href="../../polymer/polymer.html">
  <link rel="import" href="../neon-shared-element-animation-behavior.html">
  <link rel="import" href="../web-animations.html">
  
  <!--
  `<reverse-ripple-animation>` scales and transform an element such that it appears to ripple down from this element, to either
  a shared element, or a screen position.
  
  If using as a shared element animation in `<neon-animated-pages>`, use this animation in an `exit`
  animation in the source page and in an `entry` animation in the destination page. Also, define the
  reverse-ripple elements in the `sharedElements` property (not a configuration property, see
  `Polymer.NeonSharedElementAnimatableBehavior`).
  If using a screen position, define the `gesture` property.
  Configuration:
  ```
  {
    name: 'reverse-ripple-animation`.
    id: <shared-element-id>, /* set this or gesture */
    gesture: {x: <page-x>, y: <page-y>}, /* set this or id */
    timing: <animation-timing>,
    toPage: <node>, /* define for the destination page */
    fromPage: <node>, /* define for the source page */
  }
  ```
  -->
  
  <script>
    Polymer({
      is: 'reverse-ripple-animation',
  
      behaviors: [
        Polymer.NeonSharedElementAnimationBehavior
      ],
  
      configure: function(config) {
        var shared = this.findSharedElements(config);
        if (!shared) {
          return null;
        }
  
        var translateX, translateY;
        var fromRect = shared.from.getBoundingClientRect();
        if (config.gesture) {
          translateX = config.gesture.x - (fromRect.left + (fromRect.width / 2));
          translateY = config.gesture.y - (fromRect.top + (fromRect.height / 2));
        } else {
          var toRect = shared.to.getBoundingClientRect();
          translateX = (toRect.left + (toRect.width / 2)) - (fromRect.left + (fromRect.width / 2));
          translateY = (toRect.top + (toRect.height / 2)) - (fromRect.top + (fromRect.height / 2));
        }
        var translate = 'translate(' + translateX + 'px,' + translateY + 'px)';
  
        var size = Math.max(fromRect.width + Math.abs(translateX) * 2, fromRect.height + Math.abs(translateY) * 2);
        var diameter = Math.sqrt(2 * size * size);
        var scaleX = diameter / fromRect.width;
        var scaleY = diameter / fromRect.height;
        var scale = 'scale(' + scaleX + ',' + scaleY + ')';
  
        this.setPrefixedProperty(shared.from, 'transformOrigin', '50% 50%');
        shared.from.style.borderRadius = '50%';
  
        this._effect = new KeyframeEffect(shared.from, [
          {'transform': translate + ' ' + scale},
          {'transform': translate + ' scale(0)'}
        ], this.timingFromConfig(config));
        return this._effect;
      },
  
      complete: function() {
        if (this.sharedElements) {
          this.setPrefixedProperty(this.sharedElements.from, 'transformOrigin', '');
          this.sharedElements.from.style.borderRadius = '';
        }
      }
    });
  </script>