catapult/third_party/polymer/components/paper-behaviors/paper-checked-element-behavior.html

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<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="../iron-checked-element-behavior/iron-checked-element-behavior.html">
<link rel="import" href="paper-inky-focus-behavior.html">

<script>

  /**
   * Use `Polymer.PaperCheckedElementBehavior` to implement a custom element
   * that has a `checked` property similar to `Polymer.IronCheckedElementBehavior`
   * and is compatible with having a ripple effect.
   * @polymerBehavior Polymer.PaperCheckedElementBehavior
   */
  Polymer.PaperCheckedElementBehaviorImpl = {

    /**
     * Synchronizes the element's checked state with its ripple effect.
     */
    _checkedChanged: function() {
      Polymer.IronCheckedElementBehaviorImpl._checkedChanged.call(this);
      if (this.hasRipple()) {
        if (this.checked) {
          this._ripple.setAttribute('checked', '');
        } else {
          this._ripple.removeAttribute('checked');
        }
      }
    },

    /**
     * Synchronizes the element's `active` and `checked` state.
     */
    _buttonStateChanged: function() {
      Polymer.PaperRippleBehavior._buttonStateChanged.call(this);
      if (this.disabled) {
        return;
      }
      if (this.isAttached) {
        this.checked = this.active;
      }
    }

  };

  /** @polymerBehavior Polymer.PaperCheckedElementBehavior */
  Polymer.PaperCheckedElementBehavior = [
    Polymer.PaperInkyFocusBehavior,
    Polymer.IronCheckedElementBehavior,
    Polymer.PaperCheckedElementBehaviorImpl
  ];

</script>