grow-height-animation.html 1.07 KB
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<link rel="import" href="../../polymer/polymer.html">
<link rel="import" href="../../neon-animation/neon-animation-behavior.html">

<script>
  Polymer({
    is: 'expand-animation',

    behaviors: [
      Polymer.NeonAnimationBehavior
    ],

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

      var height = node.getBoundingClientRect().height;

      this._effect = new KeyframeEffect(node, [{
        height: (height / 2) + 'px'
      }, {
        height: height + 'px'
      }], this.timingFromConfig(config));

      return this._effect;
    }
  });
</script>