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1<!--
2@license
3Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
4This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
5The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
6The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
7Code distributed by Google as part of the polymer project is also
8subject 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`<hero-animation>` is a shared element animation that scales and transform an element such that it
17appears to be shared between two pages. Use this in `<neon-animated-pages>`. The source page
18should use this animation in an 'exit' animation and set the `fromPage` configuration property to
19itself, and the destination page should use this animation in an `entry` animation and set the
20`toPage` configuration property to itself. They should also define the hero elements in the
21`sharedElements` property (not a configuration property, see
22`Polymer.NeonSharedElementAnimatableBehavior`).
23
24Configuration:
25```
26{
27  name: 'hero-animation',
28  id: <shared-element-id>,
29  timing: <animation-timing>,
30  toPage: <node>, /* define for the destination page */
31  fromPage: <node>, /* define for the source page */
32}
33```
34-->
35
36<script>
37
38  Polymer({
39
40    is: 'hero-animation',
41
42    behaviors: [
43      Polymer.NeonSharedElementAnimationBehavior
44    ],
45
46    configure: function(config) {
47      var shared = this.findSharedElements(config);
48      if (!shared) {
49        return;
50      }
51
52      var fromRect = shared.from.getBoundingClientRect();
53      var toRect = shared.to.getBoundingClientRect();
54
55      var deltaLeft = fromRect.left - toRect.left;
56      var deltaTop = fromRect.top - toRect.top;
57      var deltaWidth = fromRect.width / toRect.width;
58      var deltaHeight = fromRect.height / toRect.height;
59
60      this._effect = new KeyframeEffect(shared.to, [
61        {'transform': 'translate(' + deltaLeft + 'px,' + deltaTop + 'px) scale(' + deltaWidth + ',' + deltaHeight + ')'},
62        {'transform': 'none'}
63      ], this.timingFromConfig(config));
64
65      this.setPrefixedProperty(shared.to, 'transformOrigin', '0 0');
66      shared.to.style.zIndex = 10000;
67      shared.from.style.visibility = 'hidden';
68
69      return this._effect;
70    },
71
72    complete: function(config) {
73      var shared = this.findSharedElements(config);
74      if (!shared) {
75        return null;
76      }
77      shared.to.style.zIndex = '';
78      shared.from.style.visibility = '';
79    }
80
81  });
82
83</script>
84