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      1 <!--
      2 @license
      3 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
      4 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
      5 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
      6 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
      7 Code distributed by Google as part of the polymer project is also
      8 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
      9 -->
     10 
     11 <link rel="import" href="../../polymer/polymer.html">
     12 <link rel="import" href="../neon-shared-element-animation-behavior.html">
     13 <link rel="import" href="../web-animations.html">
     14 
     15 <!--
     16 `<reverse-ripple-animation>` scales and transform an element such that it appears to ripple down from this element, to either
     17 a shared element, or a screen position.
     18 
     19 If using as a shared element animation in `<neon-animated-pages>`, use this animation in an `exit`
     20 animation in the source page and in an `entry` animation in the destination page. Also, define the
     21 reverse-ripple elements in the `sharedElements` property (not a configuration property, see
     22 `Polymer.NeonSharedElementAnimatableBehavior`).
     23 If using a screen position, define the `gesture` property.
     24 Configuration:
     25 ```
     26 {
     27   name: 'reverse-ripple-animation`.
     28   id: <shared-element-id>, /* set this or gesture */
     29   gesture: {x: <page-x>, y: <page-y>}, /* set this or id */
     30   timing: <animation-timing>,
     31   toPage: <node>, /* define for the destination page */
     32   fromPage: <node>, /* define for the source page */
     33 }
     34 ```
     35 -->
     36 
     37 <script>
     38   Polymer({
     39     is: 'reverse-ripple-animation',
     40 
     41     behaviors: [
     42       Polymer.NeonSharedElementAnimationBehavior
     43     ],
     44 
     45     configure: function(config) {
     46       var shared = this.findSharedElements(config);
     47       if (!shared) {
     48         return null;
     49       }
     50 
     51       var translateX, translateY;
     52       var fromRect = shared.from.getBoundingClientRect();
     53       if (config.gesture) {
     54         translateX = config.gesture.x - (fromRect.left + (fromRect.width / 2));
     55         translateY = config.gesture.y - (fromRect.top + (fromRect.height / 2));
     56       } else {
     57         var toRect = shared.to.getBoundingClientRect();
     58         translateX = (toRect.left + (toRect.width / 2)) - (fromRect.left + (fromRect.width / 2));
     59         translateY = (toRect.top + (toRect.height / 2)) - (fromRect.top + (fromRect.height / 2));
     60       }
     61       var translate = 'translate(' + translateX + 'px,' + translateY + 'px)';
     62 
     63       var size = Math.max(fromRect.width + Math.abs(translateX) * 2, fromRect.height + Math.abs(translateY) * 2);
     64       var diameter = Math.sqrt(2 * size * size);
     65       var scaleX = diameter / fromRect.width;
     66       var scaleY = diameter / fromRect.height;
     67       var scale = 'scale(' + scaleX + ',' + scaleY + ')';
     68 
     69       this._effect = new KeyframeEffect(shared.from, [
     70         {'transform': translate + ' ' + scale},
     71         {'transform': translate + ' scale(0)'}
     72       ], this.timingFromConfig(config));
     73 
     74       this.setPrefixedProperty(shared.from, 'transformOrigin', '50% 50%');
     75       shared.from.style.borderRadius = '50%';
     76 
     77       return this._effect;
     78     },
     79 
     80     complete: function() {
     81       if (this.sharedElements) {
     82         this.setPrefixedProperty(this.sharedElements.from, 'transformOrigin', '');
     83         this.sharedElements.from.style.borderRadius = '';
     84       }
     85     }
     86   });
     87 </script>
     88