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   /** @private {remoting.ContextMenuAdapter} */
  24   this.adapter_ = adapter;
  25   /** @private {string} */
  26   this.title_ = title;
  27   /** @private {boolean} */
  28   this.checkable_ = checkable;
  29   /** @private {!Object} */
  30   this.childIds_ = {};
  31   /** @private {string} */
  32   this.parentId_ = '';
  33 };
  34
  35 /**
  36  * Add a submenu item, or update the title of an existing submenu item.
  37  *
  38  * @param {string} id The child id.
  39  * @param {string} title The window title.
  40  * @return {boolean} True if a new menu item was created, false if an existing
  41  *     menu item was renamed.
  42  */
  43 remoting.SubmenuManager.prototype.add = function(id, title) {
  44   if (id in this.childIds_) {
  45     this.adapter_.updateTitle(id, title);
  46     return false;
  47   } else {
  48     this.childIds_[id] = true;
  49     this.addOrRemoveParent_();
  50     this.adapter_.create(id, title, this.checkable_, this.parentId_);
  51     return true;
  52   }
  53 };
  54
  55 /**
  56  * Remove a submenu item.
  57  *
  58  * @param {string} id The child id.
  59  */
  60 remoting.SubmenuManager.prototype.remove = function(id) {
  61   this.adapter_.remove(id);
  62   delete this.childIds_[id];
  63   this.addOrRemoveParent_();
  64 };
  65
  66 /**
  67  * Remove all submenu items.
  68  */
  69 remoting.SubmenuManager.prototype.removeAll = function() {
  70   var submenus = Object.keys(this.childIds_);
  71   for (var i = 0; i < submenus.length; ++i) {
  72     this.remove(submenus[i]);
  73   }
  74 };
  75
  76 /**
  77  * Add the parent menu item if it doesn't exist but there are submenus items,
  78  * or remove it if it exists but there are no submenus.
  79  *
  80  * @private
  81  */
  82 remoting.SubmenuManager.prototype.addOrRemoveParent_ = function() {
  83   if (Object.getOwnPropertyNames(this.childIds_).length != 0) {
  84     if (!this.parentId_) {
  85       this.parentId_ = base.generateXsrfToken();  // Use a random id
  86       this.adapter_.create(this.parentId_, this.title_, false);
  87     }
  88   } else {
  89     if (this.parentId_) {
  90       this.adapter_.remove(this.parentId_);
  91       this.parentId_ = '';
  92     }
  93   }
  94 };