[MD Bookmarks] Add Select for Bookmarks.

chrome/browser/resources/md_bookmarks/store.js

 // Copyright 2016 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.
 
 var BookmarksStore = Polymer({
   is: 'bookmarks-store',
 
   properties: {
     /** @type {BookmarkTreeNode} */
     rootNode: {
@@ skipping 19 matching lines @@
      * This updates to either the result of a search or the contents of the
      * selected folder.
      * @type {Array<BookmarkTreeNode>}
      */
     displayedList: {
       type: Array,
       notify: true,
       readOnly: true,
     },
 
+    /** @type {Object<?string, !BookmarkTreeNode>} */
     idToNodeMap_: Object,
+
+    /** @type {?number} */

[calamity, 2017/01/31 05:05:15]

Is this necessary?

[jiaxi, 2017/02/01 03:19:25]

We're setting anchorIndex_ to null in some situations so it is necessary.

+    anchorIndex_: Number,
+
+    /** @type {Set<string>} */
+    searchResultSet_: Object,
   },
 
   /** @private {Object} */
   documentListeners_: null,
 
   /** @override */
   attached: function() {
     this.documentListeners_ = {
-      'selected-folder-changed': this.onSelectedFolderChanged_.bind(this),
       'folder-open-changed': this.onFolderOpenChanged_.bind(this),
       'search-term-changed': this.onSearchTermChanged_.bind(this),
+      'select-item': this.onItemSelected_.bind(this),
+      'selected-folder-changed': this.onSelectedFolderChanged_.bind(this),
     };
     for (var event in this.documentListeners_)
       document.addEventListener(event, this.documentListeners_[event]);
   },
 
   /** @override */
   detached: function() {
     for (var event in this.documentListeners_)
       document.removeEventListener(event, this.documentListeners_[event]);
   },
 
   /**
    * Initializes the store with data from the bookmarks API.
    * Called by app on attached.
    */
   initializeStore: function() {
     chrome.bookmarks.getTree(function(results) {
       this.setupStore_(results[0]);
     }.bind(this));
     // Attach bookmarks API listeners.
     chrome.bookmarks.onRemoved.addListener(this.onBookmarkRemoved_.bind(this));
     chrome.bookmarks.onChanged.addListener(this.onBookmarkChanged_.bind(this));
   },
 
-  //////////////////////////////////////////////////////////////////////////////
-  // bookmarks-store, private:
+////////////////////////////////////////////////////////////////////////////////
+// bookmarks-store, private:
 
   /**
    * @param {BookmarkTreeNode} rootNode
    * @private
    */
   setupStore_: function(rootNode) {
     this.rootNode = rootNode;
     this.idToNodeMap_ = {};
     this.rootNode.path = 'rootNode';
     BookmarksStore.generatePaths(rootNode, 0);
     BookmarksStore.initNodes(this.rootNode, this.idToNodeMap_);
 
     // Initialize the store's fields from the router.
     if (this.$.router.searchTerm)
       this.searchTerm = this.$.router.searchTerm;
     else
       this.fire('selected-folder-changed', this.$.router.selectedId);
   },
 
   /** @private */
   deselectFolders_: function() {
     this.unlinkPaths('displayedList');
-    this.set(this.idToNodeMap_[this.selectedId].path + '.isSelected', false);
+    this.set(
+        this.idToNodeMap_[this.selectedId].path + '.isSelectedFolder', false);
     this.selectedId = null;
   },
 
   /**
    * @param {BookmarkTreeNode} folder
    * @private
    * @return {boolean}
    */
   isAncestorOfSelected_: function(folder) {
     if (!this.selectedId)
       return false;
 
     var selectedNode = this.idToNodeMap_[this.selectedId];
     return selectedNode.path.startsWith(folder.path);
   },
 
-  /** @private */
-  updateSearchDisplay_: function() {
+  /**
+   * When being called as an observer, |searchObserver| is the search term. When
+   * being called elsewhere, |searchObserver| is undefined. This helps the
+   * function with doing observer specific actions and can be reused in other
+   * functions to update |displayedList|.
+   * @param {string=} searchObserver
+   * @private
+   */
+  updateSearchDisplay_: function(searchObserver) {
     if (!this.rootNode)
       return;
 
     if (!this.searchTerm) {
       this.fire('selected-folder-changed', this.rootNode.children[0].id);
     } else {
       chrome.bookmarks.search(this.searchTerm, function(results) {
+        if (searchObserver)
+          this.anchorIndex_ = null;
+        this.clearSelectedItems_();
+        this.searchResultSet_ = new Set();
+
         if (this.selectedId)
           this.deselectFolders_();
 
-        this._setDisplayedList(results);
+        this.setupSearchResults_(results);
+
+        this.set(
+            'displayedList.#' + this.anchorIndex_ + '.isSelectedItem', true);
       }.bind(this));
     }
   },
 
   /** @private */
   updateSelectedDisplay_: function() {
     // Don't change to the selected display if ID was cleared.
     if (!this.selectedId)
       return;
 
+    this.clearSelectedItems_();
+    this.anchorIndex_ = null;
+
     var selectedNode = this.idToNodeMap_[this.selectedId];
     this.linkPaths('displayedList', selectedNode.path + '.children');
-    this._setDisplayedList(selectedNode.children);
+    this._setDisplayedList(
+        /** @type {Array<BookmarkTreeNode>} */ (selectedNode.children));
   },
 
   /**
    * Remove all descendants of a given node from the map.
    * @param {string} id
    * @private
    */
   removeDescendantsFromMap_: function(id) {
     var node = this.idToNodeMap_[id];
     if (!node)
       return;
 
     if (node.children) {
       for (var i = 0; i < node.children.length; i++)
         this.removeDescendantsFromMap_(node.children[i].id);
     }
     delete this.idToNodeMap_[id];
   },
 
-  //////////////////////////////////////////////////////////////////////////////
-  // bookmarks-store, bookmarks API event listeners:
+  /**
+   * Remove all selected items in the list.
+   * @private
+   */
+  clearSelectedItems_: function() {
+    if (!this.displayedList)
+      return;
+
+    for (var i = 0; i < this.displayedList.length; i++) {
+      if (!this.displayedList[i].isSelectedItem)
+        continue;
+
+      this.set('displayedList.#' + i + '.isSelectedItem', false);
+    }
+  },
+
+  /**
+   * Return the index in the search result of an item.
+   * @param {BookmarkTreeNode} item
+   * @return {number}
+   * @private
+   */
+  getIndexInList_: function(item) {
+    return this.searchTerm ? item.searchResultIndex : item.index;
+  },
+
+  /**
+   * @param {string} id
+   * @return {boolean}
+   * @private
+   */
+  isInDisplayedList_: function(id) {
+    return this.searchTerm ? this.searchResultSet_.has(id) :
+                             this.idToNodeMap_[id].parentId == this.selectedId;
+  },
+
+  /**
+   * Initializes the search results returned by the API as follows:
+   * - Populates |searchResultSet_| with a mapping of all result ids to
+   *   their corresponding result.
+   * - Sets up the |searchResultIndex|.
+   * @param {Array<BookmarkTreeNode>} results
+   * @private
+   */
+  setupSearchResults_: function(results) {
+    for (var i = 0; i < results.length; i++) {
+      results[i].searchResultIndex = i;
+      results[i].isSelectedItem = false;
+      this.searchResultSet_.add(results[i].id);
+    }
+
+    this._setDisplayedList(results);
+  },
+
+  /**
+   * Select multiple items based on |anchorIndex_| and the selected
+   * item. If |anchorIndex_| is not set, single select the item.
+   * @param {BookmarkTreeNode} item
+   * @private
+   */
+  selectRange_: function(item) {
+    var startIndex, endIndex;
+    if (this.anchorIndex_ == null) {
+      this.anchorIndex_ = this.getIndexInList_(item);
+      startIndex = this.anchorIndex_;
+      endIndex = this.anchorIndex_;
+    } else {
+      var selectedIndex = this.getIndexInList_(item);
+      startIndex = Math.min(this.anchorIndex_, selectedIndex);
+      endIndex = Math.max(this.anchorIndex_, selectedIndex);
+    }
+    for (var i = startIndex; i <= endIndex; i++)
+      this.set('displayedList.#' + i + '.isSelectedItem', true);
+  },
+
+  /**
+   * Selects a single item in the displayedList.
+   * @param {BookmarkTreeNode} item
+   * @private
+   */
+  selectItem_: function(item) {
+    this.anchorIndex_ = this.getIndexInList_(item);
+    this.set('displayedList.#' + this.anchorIndex_ + '.isSelectedItem', true);
+  },
+
+////////////////////////////////////////////////////////////////////////////////
+// bookmarks-store, bookmarks API event listeners:
 
   /**
    * Callback for when a bookmark node is removed.
    * If a folder is selected or is an ancestor of a selected folder, the parent
    * of the removed folder will be selected.
    * @param {string} id The id of the removed bookmark node.
    * @param {!{index: number,
    *           parentId: string,
    *           node: BookmarkTreeNode}} removeInfo
    */
   onBookmarkRemoved_: function(id, removeInfo) {
-    if (this.isAncestorOfSelected_(this.idToNodeMap_[id])) {
-      this.fire('selected-folder-changed', removeInfo.parentId);
-    }
+    chrome.bookmarks.getSubTree(removeInfo.parentId, function(parentNodes) {
+      var parentNode = parentNodes[0];
+      var isAncestor = this.isAncestorOfSelected_(this.idToNodeMap_[id]);
+      var isInDisplayedList = this.isInDisplayedList_(id);
 
-    var parentNode = this.idToNodeMap_[removeInfo.parentId];
-    this.splice(parentNode.path + '.children', removeInfo.index, 1);
-    this.removeDescendantsFromMap_(id);
-    BookmarksStore.generatePaths(parentNode, removeInfo.index);
+      // Polymer doesn't update the indexes after a deletion. Manually updates
+      // the indexes.
+      this.removeDescendantsFromMap_(id);
+      parentNode.path = this.idToNodeMap_[parentNode.id].path;
+      BookmarksStore.generatePaths(parentNode, 0);
+      BookmarksStore.initNodes(parentNode, this.idToNodeMap_);
+      this.set(parentNode.path, parentNode);
 
-    // Regenerate the search list if its displayed.
-    if (this.searchTerm)
-      this.updateSearchDisplay_();
+      // Updates selectedId if the removed node is an ancestor of the current
+      // selected node.
+      if (isAncestor)
+        this.fire('selected-folder-changed', removeInfo.parentId);
+
+      // Only update the displayedList if the removed node is in the
+      // displayedList.
+      if (!isInDisplayedList)
+        return;
+
+      if (this.anchorIndex_ == this.displayedList.length - 1)
+        this.anchorIndex_--;
+
+      if (this.searchTerm) {
+        this.updateSearchDisplay_();
+      } else {
+        if (!isAncestor)
+          this.fire('selected-folder-changed', this.selectedId);
+
+        this._setDisplayedList(parentNode.children);
+
+        this.set(
+            'displayedList.#' + this.anchorIndex_ + '.isSelectedItem', true);
+      }
+    }.bind(this));
   },
 
   /**
    * Called when the title of a bookmark changes.
    * @param {string} id The id of changed bookmark node.
    * @param {!Object} changeInfo
    */
   onBookmarkChanged_: function(id, changeInfo) {
     if (changeInfo.title)
       this.set(this.idToNodeMap_[id].path + '.title', changeInfo.title);
     if (changeInfo.url)
       this.set(this.idToNodeMap_[id].path + '.url', changeInfo.url);
 
     if (this.searchTerm)
       this.updateSearchDisplay_();
   },
 
-  //////////////////////////////////////////////////////////////////////////////
-  // bookmarks-store, bookmarks app event listeners:
+////////////////////////////////////////////////////////////////////////////////
+// bookmarks-store, bookmarks app event listeners:
 
   /**
    * @param {Event} e
    * @private
    */
   onSearchTermChanged_: function(e) {
     this.searchTerm = /** @type {string} */ (e.detail);
   },
 
   /**
    * Selects the folder specified by the event and deselects the previously
    * selected folder.
    * @param {CustomEvent} e
    * @private
    */
   onSelectedFolderChanged_: function(e) {
     if (this.searchTerm)
       this.searchTerm = '';
 
     // Deselect the old folder if defined.
-    if (this.selectedId)
-      this.set(this.idToNodeMap_[this.selectedId].path + '.isSelected', false);
+    if (this.selectedId && this.idToNodeMap_[this.selectedId])
+      this.set(
+          this.idToNodeMap_[this.selectedId].path + '.isSelectedFolder', false);
 
     // Check if the selected id is that of a defined folder.
     var id = /** @type {string} */ (e.detail);
     if (!this.idToNodeMap_[id] || this.idToNodeMap_[id].url)
       id = this.rootNode.children[0].id;
 
     var newFolder = this.idToNodeMap_[id];
-    this.set(newFolder.path + '.isSelected', true);
+    this.set(newFolder.path + '.isSelectedFolder', true);
     this.selectedId = id;
   },
 
   /**
    * Handles events that open and close folders.
    * @param {CustomEvent} e
    * @private
    */
   onFolderOpenChanged_: function(e) {
     var folder = this.idToNodeMap_[e.detail.id];
     this.set(folder.path + '.isOpen', e.detail.open);
     if (!folder.isOpen && this.isAncestorOfSelected_(folder))
       this.fire('selected-folder-changed', folder.id);
   },
+
+  /**
+   * Selects items according to keyboard behaviours.
+   * @param {CustomEvent} e
+   * @private
+   */
+  onItemSelected_: function(e) {
+    if (!e.detail.add)
+      this.clearSelectedItems_();
+
+    if (e.detail.range)
+      this.selectRange_(e.detail.item);
+    else
+      this.selectItem_(e.detail.item);
+  },
 });
 
 ////////////////////////////////////////////////////////////////////////////////
 // bookmarks-store, static methods:
 
 /**
  * Stores the path from the store to a node inside the node.
  * @param {BookmarkTreeNode} bookmarkNode
  * @param {number} startIndex
  */
 BookmarksStore.generatePaths = function(bookmarkNode, startIndex) {
   if (!bookmarkNode.children)
     return;
 
   for (var i = startIndex; i < bookmarkNode.children.length; i++) {
     bookmarkNode.children[i].path = bookmarkNode.path + '.children.#' + i;
     BookmarksStore.generatePaths(bookmarkNode.children[i], 0);
   }
 };
 
 /**
  * Initializes the nodes in the bookmarks tree as follows:
  * - Populates |idToNodeMap_| with a mapping of all node ids to their
  *   corresponding BookmarkTreeNode.
  * - Sets all the nodes to not selected and open by default.
  * @param {BookmarkTreeNode} bookmarkNode
  * @param {Object=} idToNodeMap
  */
 BookmarksStore.initNodes = function(bookmarkNode, idToNodeMap) {
+  bookmarkNode.isSelectedItem = false;
   if (idToNodeMap)
     idToNodeMap[bookmarkNode.id] = bookmarkNode;
 
   if (bookmarkNode.url)
     return;
 
-  bookmarkNode.isSelected = false;
+  bookmarkNode.isSelectedFolder = false;
   bookmarkNode.isOpen = true;
   for (var i = 0; i < bookmarkNode.children.length; i++)
     BookmarksStore.initNodes(bookmarkNode.children[i], idToNodeMap);
 };