third_party/polymer/v3_0/components-chromium/paper-behaviors/paper-inky-focus-behavior.js

/**
@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
*/
import '../polymer/polymer-legacy.js';

import {IronButtonState} from '../iron-behaviors/iron-button-state.js';
import {IronControlState} from '../iron-behaviors/iron-control-state.js';

import {PaperRippleBehavior} from './paper-ripple-behavior.js';

/**
 * `PaperInkyFocusBehavior` implements a ripple when the element has keyboard
 * focus.
 *
 * @polymerBehavior PaperInkyFocusBehavior
 */
export const PaperInkyFocusBehaviorImpl = {
  observers: ['_focusedChanged(receivedFocusFromKeyboard)'],

  _focusedChanged: function(receivedFocusFromKeyboard) {
    if (receivedFocusFromKeyboard) {
      this.ensureRipple();
    }
    if (this.hasRipple()) {
      this._ripple.holdDown = receivedFocusFromKeyboard;
    }
  },

  _createRipple: function() {
    var ripple = PaperRippleBehavior._createRipple();
    ripple.id = 'ink';
    ripple.setAttribute('center', '');
    ripple.classList.add('circle');
    return ripple;
  }
};

/** @polymerBehavior */
export const PaperInkyFocusBehavior = [
  IronButtonState,
  IronControlState,
  PaperRippleBehavior,
  PaperInkyFocusBehaviorImpl
];