chrome/browser/resources/bookmark_manager/js/bmm.js

   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 cr.define('bmm', function() {
   6   /**
   7    * Whether a node contains another node.
   8    * TODO(yosin): Once JavaScript style guide is updated and linter follows
   9    * that, we'll remove useless documentations for |parent| and |descendant|.
  10    * TODO(yosin): bmm.contains() should be method of BookmarkTreeNode.
  11    * @param {!BookmarkTreeNode} parent .
  12    * @param {!BookmarkTreeNode} descendant .
  13    * @return {boolean} Whether the parent contains the descendant.
  14    */
  15   function contains(parent, descendant) {
  16     if (descendant.parentId == parent.id)
  17       return true;
  18     // the bmm.treeLookup contains all folders
  19     var parentTreeItem = bmm.treeLookup[descendant.parentId];
  20     if (!parentTreeItem || !parentTreeItem.bookmarkNode)
  21       return false;
  22     return this.contains(parent, parentTreeItem.bookmarkNode);
  23   }
  24
  25   /**
  26    * @param {!BookmarkTreeNode} node The node to test.
  27    * @return {boolean} Whether a bookmark node is a folder.
  28    */
  29   function isFolder(node) {
  30     return !('url' in node);
  31   }
  32
  33   var loadingPromises = {};
  34
  35   /**
  36    * Promise version of chrome.bookmarkManagerPrivate.getSubtree.
  37    * @param {string} id .
  38    * @param {boolean} foldersOnly .
  39    * @return {!Promise.<!Array.<!BookmarkTreeNode>>} .
  40    */
  41   function getSubtreePromise(id, foldersOnly) {
  42     return new Promise(function(resolve) {
  43       chrome.bookmarkManagerPrivate.getSubtree(id, foldersOnly, resolve);
  44     });
  45   }
  46
  47   /**
  48    * Loads a subtree of the bookmark tree and returns a {@code Promise} that
  49    * will be fulfilled when done. This reuses multiple loads so that we do not
  50    * load the same subtree more than once at the same time.
  51    * @return {!Promise.<!BookmarkTreeNode>} The future promise for the load.
  52    */
  53   function loadSubtree(id) {
  54     if (!loadingPromises[id]) {
  55       loadingPromises[id] = getSubtreePromise(id, false).then(function(nodes) {
  56         delete loadingPromises[id];
  57         return nodes && nodes[0];
  58       });
  59     }
  60     return loadingPromises[id];
  61   }
  62
  63   /**
  64    * Loads the entire bookmark tree and returns a {@code Promise} that will
  65    * be fulfilled when done. This reuses multiple loads so that we do not load
  66    * the same tree more than once at the same time.
  67    * @return {!Promise.<Node>} The future promise for the load.
  68    */
  69   function loadTree() {
  70     return loadSubtree('');
  71   }
  72
  73   var bookmarkCache = {
  74     /**
  75      * Removes the cached item from both the list and tree lookups.
  76      */
  77     remove: function(id) {
  78       var treeItem = bmm.treeLookup[id];
  79       if (treeItem) {
  80         var items = treeItem.items; // is an HTMLCollection
  81         for (var i = 0; i < items.length; ++i) {
  82           var item = items[i];
  83           var bookmarkNode = item.bookmarkNode;
  84           delete bmm.treeLookup[bookmarkNode.id];
  85         }
  86         delete bmm.treeLookup[id];
  87       }
  88     },
  89
  90     /**
  91      * Updates the underlying bookmark node for the tree items and list items by
  92      * querying the bookmark backend.
  93      * @param {string} id The id of the node to update the children for.
  94      * @param {Function=} opt_f A funciton to call when done.
  95      */
  96     updateChildren: function(id, opt_f) {
  97       function updateItem(bookmarkNode) {
  98         var treeItem = bmm.treeLookup[bookmarkNode.id];
  99         if (treeItem) {
 100           treeItem.bookmarkNode = bookmarkNode;
 101         }
 102       }
 103
 104       chrome.bookmarks.getChildren(id, function(children) {
 105         if (children)
 106           children.forEach(updateItem);
 107
 108         if (opt_f)
 109           opt_f(children);
 110       });
 111     }
 112   };
 113
 114   /**
 115    * Called when the title of a bookmark changes.
 116    * @param {string} id The id of changed bookmark node.
 117    * @param {!Object} changeInfo The information about how the node changed.
 118    */
 119   function handleBookmarkChanged(id, changeInfo) {
 120     if (bmm.tree)
 121       bmm.tree.handleBookmarkChanged(id, changeInfo);
 122     if (bmm.list)
 123       bmm.list.handleBookmarkChanged(id, changeInfo);
 124   }
 125
 126   /**
 127    * Callback for when the user reorders by title.
 128    * @param {string} id The id of the bookmark folder that was reordered.
 129    * @param {!Object} reorderInfo The information about how the items where
 130    *     reordered.
 131    */
 132   function handleChildrenReordered(id, reorderInfo) {
 133     if (bmm.tree)
 134       bmm.tree.handleChildrenReordered(id, reorderInfo);
 135     if (bmm.list)
 136       bmm.list.handleChildrenReordered(id, reorderInfo);
 137     bookmarkCache.updateChildren(id);
 138   }
 139
 140   /**
 141    * Callback for when a bookmark node is created.
 142    * @param {string} id The id of the newly created bookmark node.
 143    * @param {!Object} bookmarkNode The new bookmark node.
 144    */
 145   function handleCreated(id, bookmarkNode) {
 146     if (bmm.list)
 147       bmm.list.handleCreated(id, bookmarkNode);
 148     if (bmm.tree)
 149       bmm.tree.handleCreated(id, bookmarkNode);
 150     bookmarkCache.updateChildren(bookmarkNode.parentId);
 151   }
 152
 153   /**
 154    * Callback for when a bookmark node is moved.
 155    * @param {string} id The id of the moved bookmark node.
 156    * @param {!Object} moveInfo The information about move.
 157    */
 158   function handleMoved(id, moveInfo) {
 159     if (bmm.list)
 160       bmm.list.handleMoved(id, moveInfo);
 161     if (bmm.tree)
 162       bmm.tree.handleMoved(id, moveInfo);
 163
 164     bookmarkCache.updateChildren(moveInfo.parentId);
 165     if (moveInfo.parentId != moveInfo.oldParentId)
 166       bookmarkCache.updateChildren(moveInfo.oldParentId);
 167   }
 168
 169   /**
 170    * Callback for when a bookmark node is removed.
 171    * @param {string} id The id of the removed bookmark node.
 172    * @param {!Object} bookmarkNode The information about removed.
 173    */
 174   function handleRemoved(id, removeInfo) {
 175     if (bmm.list)
 176       bmm.list.handleRemoved(id, removeInfo);
 177     if (bmm.tree)
 178       bmm.tree.handleRemoved(id, removeInfo);
 179
 180     bookmarkCache.updateChildren(removeInfo.parentId);
 181     bookmarkCache.remove(id);
 182   }
 183
 184   /**
 185    * Callback for when all bookmark nodes have been deleted.
 186    */
 187   function handleRemoveAll() {
 188     // Reload the list and the tree.
 189     if (bmm.list)
 190       bmm.list.reload();
 191     if (bmm.tree)
 192       bmm.tree.reload();
 193   }
 194
 195   /**
 196    * Callback for when importing bookmark is started.
 197    */
 198   function handleImportBegan() {
 199     chrome.bookmarks.onCreated.removeListener(handleCreated);
 200     chrome.bookmarks.onChanged.removeListener(handleBookmarkChanged);
 201   }
 202
 203   /**
 204    * Callback for when importing bookmark node is finished.
 205    */
 206   function handleImportEnded() {
 207     // When importing is done we reload the tree and the list.
 208
 209     function f() {
 210       bmm.tree.removeEventListener('load', f);
 211
 212       chrome.bookmarks.onCreated.addListener(handleCreated);
 213       chrome.bookmarks.onChanged.addListener(handleBookmarkChanged);
 214
 215       if (!bmm.list)
 216         return;
 217
 218       // TODO(estade): this should navigate to the newly imported folder, which
 219       // may be the bookmark bar if there were no previous bookmarks.
 220       bmm.list.reload();
 221     }
 222
 223     if (bmm.tree) {
 224       bmm.tree.addEventListener('load', f);
 225       bmm.tree.reload();
 226     }
 227   }
 228
 229   /**
 230    * Adds the listeners for the bookmark model change events.
 231    */
 232   function addBookmarkModelListeners() {
 233     chrome.bookmarks.onChanged.addListener(handleBookmarkChanged);
 234     chrome.bookmarks.onChildrenReordered.addListener(handleChildrenReordered);
 235     chrome.bookmarks.onCreated.addListener(handleCreated);
 236     chrome.bookmarks.onMoved.addListener(handleMoved);
 237     chrome.bookmarks.onRemoved.addListener(handleRemoved);
 238     chrome.bookmarks.onImportBegan.addListener(handleImportBegan);
 239     chrome.bookmarks.onImportEnded.addListener(handleImportEnded);
 240   };
 241
 242   return {
 243     contains: contains,
 244     isFolder: isFolder,
 245     loadSubtree: loadSubtree,
 246     loadTree: loadTree,
 247     addBookmarkModelListeners: addBookmarkModelListeners
 248   };
 249 });