| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| /** |
| * @fileoverview |
| * Class representing a menu button and its associated menu items. |
| */ |
| |
| 'use strict'; |
| |
| /** @suppress {duplicate} */ |
| var remoting = remoting || {}; |
| |
| /** |
| * @constructor |
| * @param {Element} container The element containing the <button> and <ul> |
| * elements comprising the menu. It should have the "menu-button" class. |
| * @param {function():void=} opt_onShow Optional callback invoked before the |
| * menu is shown. |
| * @param {function():void=} opt_onHide Optional callback after before the |
| * menu is hidden. |
| */ |
| remoting.MenuButton = function(container, opt_onShow, opt_onHide) { |
| /** @private {HTMLElement} */ |
| this.button_ = /** @type {HTMLElement} */ |
| (container.querySelector('button,.menu-button-activator')); |
| |
| /** @private {HTMLElement} */ |
| this.menu_ = /** @type {HTMLElement} */ (container.querySelector('ul')); |
| |
| /** @private {undefined|function():void} */ |
| this.onShow_ = opt_onShow; |
| |
| /** @private {undefined|function():void} */ |
| this.onHide_ = opt_onHide; |
| |
| /** |
| * Create a "click-trap" div covering the entire document, but below the |
| * menu in the z-order. This ensures the the menu can be closed by clicking |
| * anywhere. Note that adding this event handler to <body> is not enough, |
| * because elements can prevent event propagation; specifically, the client |
| * plugin element does this. |
| * |
| * @private {HTMLElement} |
| */ |
| this.clickTrap_ = /** @type {HTMLElement} */ (document.createElement('div')); |
| this.clickTrap_.classList.add('menu-button-click-trap'); |
| |
| /** @type {remoting.MenuButton} */ |
| var that = this; |
| |
| var closeHandler = function() { |
| that.button_.classList.remove(remoting.MenuButton.BUTTON_ACTIVE_CLASS_); |
| container.removeChild(that.clickTrap_); |
| if (that.onHide_) { |
| that.onHide_(); |
| } |
| }; |
| |
| var onClick = function() { |
| if (that.onShow_) { |
| that.onShow_(); |
| } |
| that.button_.classList.add(remoting.MenuButton.BUTTON_ACTIVE_CLASS_); |
| container.appendChild(that.clickTrap_); |
| }; |
| |
| this.button_.addEventListener('click', onClick, false); |
| this.clickTrap_.addEventListener('click', closeHandler, false); |
| this.menu_.addEventListener('click', closeHandler, false); |
| }; |
| |
| /** |
| * @return {HTMLElement} The button that activates the menu. |
| */ |
| remoting.MenuButton.prototype.button = function() { |
| return this.button_; |
| }; |
| |
| /** |
| * @return {HTMLElement} The menu. |
| */ |
| remoting.MenuButton.prototype.menu = function() { |
| return this.menu_; |
| }; |
| |
| /** |
| * Set or unset the selected state of an <li> menu item. |
| * @param {Element} item The menu item to update. |
| * @param {boolean} selected True to select the item, false to deselect it. |
| * @return {void} Nothing. |
| */ |
| remoting.MenuButton.select = function(item, selected) { |
| if (selected) { |
| item.classList.add('selected'); |
| } else { |
| item.classList.remove('selected'); |
| } |
| }; |
| |
| /** @const @private */ |
| remoting.MenuButton.BUTTON_ACTIVE_CLASS_ = 'active'; |
