<!– @license Copyright © 2015 The Polymer Project Authors. All rights reserved. This code may only be used under the BSD style license found at polymer.github.io/LICENSE.txt The complete set of authors may be found at polymer.github.io/AUTHORS.txt The complete set of contributors may be found at 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 polymer.github.io/PATENTS.txt –>

<link rel=“import” href=“../../polymer/polymer.html”> <link rel=“import” href=“../neon-shared-element-animation-behavior.html”> <link rel=“import” href=“../web-animations.html”>

<!– `<hero-animation>` is a shared element animation that scales and transform an element such that it appears to be shared between two pages. Use this in `<neon-animated-pages>`. The source page should use this animation in an 'exit' animation and set the `fromPage` configuration property to itself, and the destination page should use this animation in an `entry` animation and set the `toPage` configuration property to itself. They should also define the hero elements in the `sharedElements` property (not a configuration property, see `Polymer.NeonSharedElementAnimatableBehavior`).

Configuration: “` {

name: 'hero-animation',
id: <shared-element-id>,
timing: <animation-timing>,
toPage: <node>, /* define for the destination page */
fromPage: <node>, /* define for the source page */

} “` –>

<script>

Polymer({

  is: 'hero-animation',

  behaviors: [
    Polymer.NeonSharedElementAnimationBehavior
  ],

  configure: function(config) {
    var shared = this.findSharedElements(config);
    if (!shared) {
      return;
    }

    var fromRect = shared.from.getBoundingClientRect();
    var toRect = shared.to.getBoundingClientRect();

    var deltaLeft = fromRect.left - toRect.left;
    var deltaTop = fromRect.top - toRect.top;
    var deltaWidth = fromRect.width / toRect.width;
    var deltaHeight = fromRect.height / toRect.height;

    this._effect = new KeyframeEffect(shared.to, [
      {'transform': 'translate(' + deltaLeft + 'px,' + deltaTop + 'px) scale(' + deltaWidth + ',' + deltaHeight + ')'},
      {'transform': 'none'}
    ], this.timingFromConfig(config));

    this.setPrefixedProperty(shared.to, 'transformOrigin', '0 0');
    shared.to.style.zIndex = 10000;
    shared.from.style.visibility = 'hidden';

    return this._effect;
  },

  complete: function(config) {
    var shared = this.findSharedElements(config);
    if (!shared) {
      return null;
    }
    shared.to.style.zIndex = '';
    shared.from.style.visibility = '';
  }

});

</script>