catapult/third_party/polymer/components/neon-animation/animations/scale-down-animation.html

<!--
@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
-->

<link rel="import" href="../../polymer/polymer.html">
<link rel="import" href="../neon-animation-behavior.html">
<link rel="import" href="../web-animations.html">

<!--
`<scale-down-animation>` animates the scale transform of an element from 1 to 0. By default it
scales in both the x and y axes.

Configuration:
```
{
  name: 'scale-down-animation',
  node: <node>,
  axis: 'x' | 'y' | '',
  transformOrigin: <transform-origin>,
  timing: <animation-timing>
}
```
-->

<script>

  Polymer({

    is: 'scale-down-animation',

    behaviors: [
      Polymer.NeonAnimationBehavior
    ],

    configure: function(config) {
      var node = config.node;

      var scaleProperty = 'scale(0, 0)';
      if (config.axis === 'x') {
        scaleProperty = 'scale(0, 1)';
      } else if (config.axis === 'y') {
        scaleProperty = 'scale(1, 0)';
      }

      this._effect = new KeyframeEffect(node, [
        {'transform': 'scale(1,1)'},
        {'transform': scaleProperty}
      ], this.timingFromConfig(config));

      if (config.transformOrigin) {
        this.setPrefixedProperty(node, 'transformOrigin', config.transformOrigin);
      }

      return this._effect;
    }

  });

</script>