remoting/webapp/app_remoting/js/submenu_manager.js

   1 // Copyright 2014 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  * Helper class for submenus that should add or remove the parent menu entry
   8  * depending on whether or not any child items exist.
   9  */
  10
  11 'use strict';
  12
  13 /** @suppress {duplicate} */
  14 var remoting = remoting || {};
  15
  16 /**
  17  * @param {remoting.ContextMenuAdapter} adapter
  18  * @param {string} title The title of the parent menu item.
  19  * @param {boolean} checkable True if the child menus should be checkable.
  20  * @constructor
  21  */
  22 remoting.SubmenuManager = function(adapter, title, checkable) {
  23   /**
  24    * @type {remoting.ContextMenuAdapter}
  25    * @private
  26    */
  27   this.adapter_ = adapter;
  28   /**
  29    * @type {string}
  30    * @private
  31    */
  32   this.title_ = title;
  33   /**
  34    * @type {boolean}
  35    * @private
  36    */
  37   this.checkable_ = checkable;
  38   /**
  39    * @type {!Object}
  40    * @private
  41    */
  42   this.childIds_ = {};
  43   /**
  44    * @type {string}
  45    * @private
  46    */
  47   this.parentId_ = '';
  48 };
  49
  50 /**
  51  * Add a submenu item, or update the title of an existing submenu item.
  52  *
  53  * @param {string} id The child id.
  54  * @param {string} title The window title.
  55  * @return {boolean} True if a new menu item was created, false if an existing
  56  *     menu item was renamed.
  57  */
  58 remoting.SubmenuManager.prototype.add = function(id, title) {
  59   if (id in this.childIds_) {
  60     this.adapter_.updateTitle(id, title);
  61     return false;
  62   } else {
  63     this.childIds_[id] = true;
  64     this.addOrRemoveParent_();
  65     this.adapter_.create(id, title, this.checkable_, this.parentId_);
  66     return true;
  67   }
  68 };
  69
  70 /**
  71  * Remove a submenu item.
  72  *
  73  * @param {string} id The child id.
  74  */
  75 remoting.SubmenuManager.prototype.remove = function(id) {
  76   this.adapter_.remove(id);
  77   delete this.childIds_[id];
  78   this.addOrRemoveParent_();
  79 };
  80
  81 /**
  82  * Remove all submenu items.
  83  */
  84 remoting.SubmenuManager.prototype.removeAll = function() {
  85   var submenus = Object.keys(this.childIds_);
  86   for (var i = 0; i < submenus.length; ++i) {
  87     this.remove(submenus[i]);
  88   }
  89 };
  90
  91 /**
  92  * Add the parent menu item if it doesn't exist but there are submenus items,
  93  * or remove it if it exists but there are no submenus.
  94  *
  95  * @private
  96  */
  97 remoting.SubmenuManager.prototype.addOrRemoveParent_ = function() {
  98   if (Object.getOwnPropertyNames(this.childIds_).length != 0) {
  99     if (!this.parentId_) {
 100       this.parentId_ = base.generateXsrfToken();  // Use a random id
 101       this.adapter_.create(this.parentId_, this.title_, false);
 102     }
 103   } else {
 104     if (this.parentId_) {
 105       this.adapter_.remove(this.parentId_);
 106       this.parentId_ = '';
 107     }
 108   }
 109 };