systrace/catapult/third_party/polymer/components/neon-animation/demo/dropdown/animated-dropdown.html

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<link rel="import" href="../../../polymer/polymer.html">
<link rel="import" href="../../../paper-styles/shadow.html">
<link rel="import" href="../../neon-animation-runner-behavior.html">

<dom-module id="animated-dropdown">
  <template>
    <style>
      :host {
        display: none;
        padding: 16px;
        background: white;
        color: black;

        @apply(--shadow-elevation-2dp);
      }
    </style>
    <content></content>
  </template>
</dom-module>

<script>

  Polymer({

    is: 'animated-dropdown',

    behaviors: [
      Polymer.NeonAnimationRunnerBehavior
    ],

    properties: {

      animationConfig: {
        type: Object,
        value: function() {
          return {
            'entry': [{
              name: 'scale-up-animation',
              node: this,
              transformOrigin: '0 0'
            }],
            'exit': [{
              name: 'fade-out-animation',
              node: this
            }]
          }
        }
      },

      _showing: {
        type: Boolean,
        value: false
      }

    },

    listeners: {
      'neon-animation-finish': '_onAnimationFinish'
    },

    _onAnimationFinish: function() {
      if (this._showing) {
      } else {
        this.style.display = '';
      }
    },

    show: function() {
      this.style.display = 'inline-block';
      this._showing = true;
      this.playAnimation('entry');
    },

    hide: function() {
      this._showing = false;
      this.playAnimation('exit');
    }

  });

</script>