<!– @license Copyright © 2015 The Polymer Project Authors. All rights reserved. This code may only be used under the BSD style license found at polymer.github.io/LICENSE.txt The complete set of authors may be found at polymer.github.io/AUTHORS.txt The complete set of contributors may be found at 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 polymer.github.io/PATENTS.txt –>

<link rel=“import” href=“../polymer/polymer.html”> <link rel=“import” href=“../paper-ripple/paper-ripple.html”>

<script>

/**
 * `Polymer.PaperRippleBehavior` dynamically implements a ripple
 * when the element has focus via pointer or keyboard.
 *
 * NOTE: This behavior is intended to be used in conjunction with and after
 * `Polymer.IronButtonState` and `Polymer.IronControlState`.
 *
 * @polymerBehavior Polymer.PaperRippleBehavior
 */
Polymer.PaperRippleBehavior = {
  properties: {
    /**
     * If true, the element will not produce a ripple effect when interacted
     * with via the pointer.
     */
    noink: {
      type: Boolean,
      observer: '_noinkChanged'
    },

    /**
     * @type {Element|undefined}
     */
    _rippleContainer: {
      type: Object,
    }
  },

  /**
   * Ensures a `<paper-ripple>` element is available when the element is
   * focused.
   */
  _buttonStateChanged: function() {
    if (this.focused) {
      this.ensureRipple();
    }
  },

  /**
   * In addition to the functionality provided in `IronButtonState`, ensures
   * a ripple effect is created when the element is in a `pressed` state.
   */
  _downHandler: function(event) {
    Polymer.IronButtonStateImpl._downHandler.call(this, event);
    if (this.pressed) {
      this.ensureRipple(event);
    }
  },

  /**
   * Ensures this element contains a ripple effect. For startup efficiency
   * the ripple effect is dynamically on demand when needed.
   * @param {!Event=} optTriggeringEvent (optional) event that triggered the
   * ripple.
   */
  ensureRipple: function(optTriggeringEvent) {
    if (!this.hasRipple()) {
      this._ripple = this._createRipple();
      this._ripple.noink = this.noink;
      var rippleContainer = this._rippleContainer || this.root;
      if (rippleContainer) {
        Polymer.dom(rippleContainer).appendChild(this._ripple);
      }
      if (optTriggeringEvent) {
        // Check if the event happened inside of the ripple container
        // Fall back to host instead of the root because distributed text
        // nodes are not valid event targets
        var domContainer = Polymer.dom(this._rippleContainer || this);
        var target = Polymer.dom(optTriggeringEvent).rootTarget;
        if (domContainer.deepContains( /** @type {Node} */(target))) {
          this._ripple.uiDownAction(optTriggeringEvent);
        }
      }
    }
  },

  /**
   * Returns the `<paper-ripple>` element used by this element to create
   * ripple effects. The element's ripple is created on demand, when
   * necessary, and calling this method will force the
   * ripple to be created.
   */
  getRipple: function() {
    this.ensureRipple();
    return this._ripple;
  },

  /**
   * Returns true if this element currently contains a ripple effect.
   * @return {boolean}
   */
  hasRipple: function() {
    return Boolean(this._ripple);
  },

  /**
   * Create the element's ripple effect via creating a `<paper-ripple>`.
   * Override this method to customize the ripple element.
   * @return {!PaperRippleElement} Returns a `<paper-ripple>` element.
   */
  _createRipple: function() {
    return /** @type {!PaperRippleElement} */ (
        document.createElement('paper-ripple'));
  },

  _noinkChanged: function(noink) {
    if (this.hasRipple()) {
      this._ripple.noink = noink;
    }
  }
};

</script>