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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 /** |
| 6 * @fileoverview |
| 7 * Class representing a menu button and its associated menu items. |
| 8 */ |
| 9 |
| 10 'use strict'; |
| 11 |
| 12 /** @suppress {duplicate} */ |
| 13 var remoting = remoting || {}; |
| 14 |
| 15 /** |
| 16 * @constructor |
| 17 * @param {Element} container The element containing the <button> and <ul> |
| 18 * elements comprising the menu. It should have the "menu-button" class. |
| 19 * @param {function():void=} opt_onShow Optional callback invoked before the |
| 20 * menu is shown. |
| 21 */ |
| 22 remoting.MenuButton = function(container, opt_onShow) { |
| 23 /** |
| 24 * @type {HTMLElement} |
| 25 * @private |
| 26 */ |
| 27 this.button_ = /** @type {HTMLElement} */ (container.querySelector('button')); |
| 28 |
| 29 /** |
| 30 * @type {undefined|function():void} |
| 31 * @private |
| 32 */ |
| 33 this.onShow_ = opt_onShow; |
| 34 |
| 35 /** @type {remoting.MenuButton} */ |
| 36 var that = this; |
| 37 |
| 38 // Create event handlers to show and hide the menu, attached to the button |
| 39 // and the document <html> tag, respectively. These handlers are added and |
| 40 // removed depending on the state of the menu. To prevent both triggering |
| 41 // for one click, they are added by a timer. |
| 42 /** |
| 43 * @type {function(Event):void} |
| 44 * @private |
| 45 */ |
| 46 this.onClick_ = function(event) { |
| 47 if (that.onShow_) { |
| 48 that.onShow_(); |
| 49 } |
| 50 that.button_.classList.add(remoting.MenuButton.BUTTON_ACTIVE_CLASS_); |
| 51 that.button_.removeEventListener('click', that.onClick_, false); |
| 52 window.setTimeout( |
| 53 function() { |
| 54 document.all[0].addEventListener('click', that.closeHandler_, true); |
| 55 }, |
| 56 100); |
| 57 }; |
| 58 |
| 59 /** |
| 60 * @type {function(Event):void} |
| 61 * @private |
| 62 */ |
| 63 this.closeHandler_ = function(event) { |
| 64 that.button_.classList.remove(remoting.MenuButton.BUTTON_ACTIVE_CLASS_); |
| 65 document.all[0].removeEventListener('click', that.closeHandler_, true); |
| 66 window.setTimeout( |
| 67 function() { |
| 68 that.button_.addEventListener('click', that.onClick_, false); |
| 69 }, |
| 70 100); |
| 71 }; |
| 72 |
| 73 this.button_.addEventListener('click', this.onClick_, false); |
| 74 }; |
| 75 |
| 76 /** |
| 77 * Set or unset the selected state of an <li> menu item. |
| 78 * @param {HTMLElement} item The menu item to update. |
| 79 * @param {boolean} selected True to select the item, false to deselect it. |
| 80 * @return {void} Nothing. |
| 81 */ |
| 82 remoting.MenuButton.select = function(item, selected) { |
| 83 if (selected) { |
| 84 item.classList.add('selected'); |
| 85 } else { |
| 86 item.classList.remove('selected'); |
| 87 } |
| 88 } |
| 89 |
| 90 /** @const @private */ |
| 91 remoting.MenuButton.BUTTON_ACTIVE_CLASS_ = 'active'; |
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