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1 files changed, 1770 insertions, 0 deletions

diff --git a/components/places/content/treeView.js b/components/places/content/treeView.js
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+++ b/components/places/content/treeView.js
@@ -0,0 +1,1770 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+Components.utils.import('resource://gre/modules/XPCOMUtils.jsm');
+
+const PTV_interfaces = [Ci.nsITreeView,
+                        Ci.nsINavHistoryResultObserver,
+                        Ci.nsINavHistoryResultTreeViewer,
+                        Ci.nsISupportsWeakReference];
+
+function PlacesTreeView(aFlatList, aOnOpenFlatContainer, aController) {
+  this._tree = null;
+  this._result = null;
+  this._selection = null;
+  this._rootNode = null;
+  this._rows = [];
+  this._flatList = aFlatList;
+  this._openContainerCallback = aOnOpenFlatContainer;
+  this._controller = aController;
+}
+
+PlacesTreeView.prototype = {
+  get wrappedJSObject() this,
+
+  __dateService: null,
+  get _dateService() {
+    if (!this.__dateService) {
+      this.__dateService = Cc["@mozilla.org/intl/scriptabledateformat;1"].
+                           getService(Ci.nsIScriptableDateFormat);
+    }
+    return this.__dateService;
+  },
+
+  QueryInterface: XPCOMUtils.generateQI(PTV_interfaces),
+
+  // Bug 761494:
+  // ----------
+  // Some addons use methods from nsINavHistoryResultObserver and
+  // nsINavHistoryResultTreeViewer, without QIing to these interfaces first.
+  // That's not a problem when the view is retrieved through the
+  // <tree>.view getter (which returns the wrappedJSObject of this object),
+  // it raises an issue when the view retrieved through the treeBoxObject.view
+  // getter.  Thus, to avoid breaking addons, the interfaces are prefetched.
+  classInfo: XPCOMUtils.generateCI({ interfaces: PTV_interfaces }),
+
+  /**
+   * This is called once both the result and the tree are set.
+   */
+  _finishInit: function PTV__finishInit() {
+    let selection = this.selection;
+    if (selection)
+      selection.selectEventsSuppressed = true;
+
+    if (!this._rootNode.containerOpen) {
+      // This triggers containerStateChanged which then builds the visible
+      // section.
+      this._rootNode.containerOpen = true;
+    }
+    else
+      this.invalidateContainer(this._rootNode);
+
+    // "Activate" the sorting column and update commands.
+    this.sortingChanged(this._result.sortingMode);
+
+    if (selection)
+      selection.selectEventsSuppressed = false;
+  },
+
+  /**
+   * Plain Container: container result nodes which may never include sub
+   * hierarchies.
+   *
+   * When the rows array is constructed, we don't set the children of plain
+   * containers.  Instead, we keep placeholders for these children.  We then
+   * build these children lazily as the tree asks us for information about each
+   * row.  Luckily, the tree doesn't ask about rows outside the visible area.
+   *
+   * @see _getNodeForRow and _getRowForNode for the actual magic.
+   *
+   * @note It's guaranteed that all containers are listed in the rows
+   * elements array.  It's also guaranteed that separators (if they're not
+   * filtered, see below) are listed in the visible elements array, because
+   * bookmark folders are never built lazily, as described above.
+   *
+   * @param aContainer
+   *        A container result node.
+   *
+   * @return true if aContainer is a plain container, false otherwise.
+   */
+  _isPlainContainer: function PTV__isPlainContainer(aContainer) {
+    // Livemarks are always plain containers.
+    if (this._controller.hasCachedLivemarkInfo(aContainer))
+      return true;
+
+    // We don't know enough about non-query containers.
+    if (!(aContainer instanceof Ci.nsINavHistoryQueryResultNode))
+      return false;
+
+    switch (aContainer.queryOptions.resultType) {
+      case Ci.nsINavHistoryQueryOptions.RESULTS_AS_DATE_QUERY:
+      case Ci.nsINavHistoryQueryOptions.RESULTS_AS_SITE_QUERY:
+      case Ci.nsINavHistoryQueryOptions.RESULTS_AS_DATE_SITE_QUERY:
+      case Ci.nsINavHistoryQueryOptions.RESULTS_AS_TAG_QUERY:
+        return false;
+    }
+
+    // If it's a folder, it's not a plain container.
+    let nodeType = aContainer.type;
+    return nodeType != Ci.nsINavHistoryResultNode.RESULT_TYPE_FOLDER &&
+           nodeType != Ci.nsINavHistoryResultNode.RESULT_TYPE_FOLDER_SHORTCUT;
+  },
+
+  /**
+   * Gets the row number for a given node.  Assumes that the given node is
+   * visible (i.e. it's not an obsolete node).
+   *
+   * @param aNode
+   *        A result node.  Do not pass an obsolete node, or any
+   *        node which isn't supposed to be in the tree (e.g. separators in
+   *        sorted trees).
+   * @param [optional] aForceBuild
+   *        @see _isPlainContainer.
+   *        If true, the row will be computed even if the node still isn't set
+   *        in our rows array.
+   * @param [optional] aParentRow
+   *        The row of aNode's parent. Ignored for the root node.
+   * @param [optional] aNodeIndex
+   *        The index of aNode in its parent.  Only used if aParentRow is
+   *        set too.
+   *
+   * @throws if aNode is invisible.
+   * @note If aParentRow and aNodeIndex are passed and parent is a plain
+   * container, this method will just return a calculated row value, without
+   * making assumptions on existence of the node at that position.
+   * @return aNode's row if it's in the rows list or if aForceBuild is set, -1
+   *         otherwise.
+   */
+  _getRowForNode:
+  function PTV__getRowForNode(aNode, aForceBuild, aParentRow, aNodeIndex) {
+    if (aNode == this._rootNode)
+      throw new Error("The root node is never visible");
+
+    // A node is removed form the view either if it has no parent or if its
+    // root-ancestor is not the root node (in which case that's the node
+    // for which nodeRemoved was called).
+    // Tycho: let ancestors = [x for (x of PlacesUtils.nodeAncestors(aNode))];
+    let ancestors = [];
+    for (let x of PlacesUtils.nodeAncestors(aNode)) {
+      ancestors.push(x);
+    }
+
+    if (ancestors.length == 0 ||
+        ancestors[ancestors.length - 1] != this._rootNode) {
+      throw new Error("Removed node passed to _getRowForNode");
+    }
+
+    // Ensure that the entire chain is open, otherwise that node is invisible.
+    for (let ancestor of ancestors) {
+      if (!ancestor.containerOpen)
+        throw new Error("Invisible node passed to _getRowForNode");
+    }
+
+    // Non-plain containers are initially built with their contents.
+    let parent = aNode.parent;
+    let parentIsPlain = this._isPlainContainer(parent);
+    if (!parentIsPlain) {
+      if (parent == this._rootNode)
+        return this._rows.indexOf(aNode);
+
+      return this._rows.indexOf(aNode, aParentRow);
+    }
+
+    let row = -1;
+    let useNodeIndex = typeof(aNodeIndex) == "number";
+    if (parent == this._rootNode) {
+      if (aNode instanceof Ci.nsINavHistoryResultNode) {
+        row = useNodeIndex ? aNodeIndex : this._rootNode.getChildIndex(aNode);
+      }
+    } else if (useNodeIndex && typeof(aParentRow) == "number") {
+      // If we have both the row of the parent node, and the node's index, we
+      // can avoid searching the rows array if the parent is a plain container.
+      row = aParentRow + aNodeIndex + 1;
+    } else {
+      // Look for the node in the nodes array.  Start the search at the parent
+      // row.  If the parent row isn't passed, we'll pass undefined to indexOf,
+      // which is fine.
+      row = this._rows.indexOf(aNode, aParentRow);
+      if (row == -1 && aForceBuild) {
+        let parentRow = typeof(aParentRow) == "number" ? aParentRow
+                                                       : this._getRowForNode(parent);
+        row = parentRow + parent.getChildIndex(aNode) + 1;
+      }
+    }
+
+    if (row != -1)
+      this._rows[row] = aNode;
+
+    return row;
+  },
+
+  /**
+   * Given a row, finds and returns the parent details of the associated node.
+   *
+   * @param aChildRow
+   *        Row number.
+   * @return [parentNode, parentRow]
+   */
+  _getParentByChildRow: function PTV__getParentByChildRow(aChildRow) {
+    let node = this._getNodeForRow(aChildRow);
+    let parent = (node === null) ? this._rootNode : node.parent;
+
+    // The root node is never visible
+    if (parent == this._rootNode)
+      return [this._rootNode, -1];
+
+    let parentRow = this._rows.lastIndexOf(parent, aChildRow - 1);
+    return [parent, parentRow];
+  },
+
+  /**
+   * Gets the node at a given row.
+   */
+  _getNodeForRow: function PTV__getNodeForRow(aRow) {
+    if (aRow < 0) {
+      return null;
+    }
+  
+    let node = this._rows[aRow];
+    if (node !== undefined)
+      return node;
+
+    // Find the nearest node.
+    let rowNode, row;
+    for (let i = aRow - 1; i >= 0 && rowNode === undefined; i--) {
+      rowNode = this._rows[i];
+      row = i;
+    }
+
+    // If there's no container prior to the given row, it's a child of
+    // the root node (remember: all containers are listed in the rows array).
+    if (!rowNode)
+      return this._rows[aRow] = this._rootNode.getChild(aRow);
+
+    // Unset elements may exist only in plain containers.  Thus, if the nearest
+    // node is a container, it's the row's parent, otherwise, it's a sibling.
+    if (rowNode instanceof Ci.nsINavHistoryContainerResultNode)
+      return this._rows[aRow] = rowNode.getChild(aRow - row - 1);
+
+    let [parent, parentRow] = this._getParentByChildRow(row);
+    return this._rows[aRow] = parent.getChild(aRow - parentRow - 1);
+  },
+
+  /**
+   * This takes a container and recursively appends our rows array per its
+   * contents.  Assumes that the rows arrays has no rows for the given
+   * container.
+   *
+   * @param [in] aContainer
+   *        A container result node.
+   * @param [in] aFirstChildRow
+   *        The first row at which nodes may be inserted to the row array.
+   *        In other words, that's aContainer's row + 1.
+   * @param [out] aToOpen
+   *        An array of containers to open once the build is done.
+   *
+   * @return the number of rows which were inserted.
+   */
+  _buildVisibleSection:
+  function PTV__buildVisibleSection(aContainer, aFirstChildRow, aToOpen)
+  {
+    // There's nothing to do if the container is closed.
+    if (!aContainer.containerOpen)
+      return 0;
+
+    // Inserting the new elements into the rows array in one shot (by
+    // Array.concat) is faster than resizing the array (by splice) on each loop
+    // iteration.
+    let cc = aContainer.childCount;
+    let newElements = new Array(cc);
+    this._rows = this._rows.splice(0, aFirstChildRow)
+                     .concat(newElements, this._rows);
+
+    if (this._isPlainContainer(aContainer))
+      return cc;
+
+    const openLiteral = PlacesUIUtils.RDF.GetResource("http://home.netscape.com/NC-rdf#open");
+    const trueLiteral = PlacesUIUtils.RDF.GetLiteral("true");
+    let sortingMode = this._result.sortingMode;
+
+    let rowsInserted = 0;
+    for (let i = 0; i < cc; i++) {
+      let curChild = aContainer.getChild(i);
+      let curChildType = curChild.type;
+
+      let row = aFirstChildRow + rowsInserted;
+
+      // Don't display separators when sorted.
+      if (curChildType == Ci.nsINavHistoryResultNode.RESULT_TYPE_SEPARATOR) {
+        if (sortingMode != Ci.nsINavHistoryQueryOptions.SORT_BY_NONE) {
+          // Remove the element for the filtered separator.
+          // Notice that the rows array was initially resized to include all
+          // children.
+          this._rows.splice(row, 1);
+          continue;
+        }
+      }
+
+      this._rows[row] = curChild;
+      rowsInserted++;
+
+      // Recursively do containers.
+      if (!this._flatList &&
+          curChild instanceof Ci.nsINavHistoryContainerResultNode &&
+          !this._controller.hasCachedLivemarkInfo(curChild)) {
+        let resource = this._getResourceForNode(curChild);
+        let isopen = resource != null &&
+                     PlacesUIUtils.localStore.HasAssertion(resource,
+                                                           openLiteral,
+                                                           trueLiteral, true);
+        if (isopen != curChild.containerOpen)
+          aToOpen.push(curChild);
+        else if (curChild.containerOpen && curChild.childCount > 0)
+          rowsInserted += this._buildVisibleSection(curChild, row + 1, aToOpen);
+      }
+    }
+
+    return rowsInserted;
+  },
+
+  /**
+   * This counts how many rows a node takes in the tree.  For containers it
+   * will count the node itself plus any child node following it.
+   */
+  _countVisibleRowsForNodeAtRow:
+  function PTV__countVisibleRowsForNodeAtRow(aNodeRow) {
+    let node = this._rows[aNodeRow];
+
+    // If it's not listed yet, we know that it's a leaf node (instanceof also
+    // null-checks).
+    if (!(node instanceof Ci.nsINavHistoryContainerResultNode))
+      return 1;
+
+    let outerLevel = node.indentLevel;
+    for (let i = aNodeRow + 1; i < this._rows.length; i++) {
+      let rowNode = this._rows[i];
+      if (rowNode && rowNode.indentLevel <= outerLevel)
+        return i - aNodeRow;
+    }
+
+    // This node plus its children take up the bottom of the list.
+    return this._rows.length - aNodeRow;
+  },
+
+  _getSelectedNodesInRange:
+  function PTV__getSelectedNodesInRange(aFirstRow, aLastRow) {
+    let selection = this.selection;
+    let rc = selection.getRangeCount();
+    if (rc == 0)
+      return [];
+
+    // The visible-area borders are needed for checking whether a
+    // selected row is also visible.
+    let firstVisibleRow = this._tree.getFirstVisibleRow();
+    let lastVisibleRow = this._tree.getLastVisibleRow();
+
+    let nodesInfo = [];
+    for (let rangeIndex = 0; rangeIndex < rc; rangeIndex++) {
+      let min = { }, max = { };
+      selection.getRangeAt(rangeIndex, min, max);
+
+      // If this range does not overlap the replaced chunk, we don't need to
+      // persist the selection.
+      if (max.value < aFirstRow || min.value > aLastRow)
+        continue;
+
+      let firstRow = Math.max(min.value, aFirstRow);
+      let lastRow = Math.min(max.value, aLastRow);
+      for (let i = firstRow; i <= lastRow; i++) {
+        nodesInfo.push({
+          node: this._rows[i],
+          oldRow: i,
+          wasVisible: i >= firstVisibleRow && i <= lastVisibleRow
+        });
+      }
+    }
+
+    return nodesInfo;
+  },
+
+  /**
+   * Tries to find an equivalent node for a node which was removed.  We first
+   * look for the original node, in case it was just relocated.  Then, if we
+   * that node was not found, we look for a node that has the same itemId, uri
+   * and time values.
+   *
+   * @param aUpdatedContainer
+   *        An ancestor of the node which was removed.  It does not have to be
+   *        its direct parent.
+   * @param aOldNode
+   *        The node which was removed.
+   *
+   * @return the row number of an equivalent node for aOldOne, if one was
+   *         found, -1 otherwise.
+   */
+  _getNewRowForRemovedNode:
+  function PTV__getNewRowForRemovedNode(aUpdatedContainer, aOldNode) {
+    if (aOldNode == undefined) {
+      return -1;
+    }
+    let parent = aOldNode.parent;
+    if (parent) {
+      // If the node's parent is still set, the node is not obsolete
+      // and we should just find out its new position.
+      // However, if any of the node's ancestor is closed, the node is
+      // invisible.
+      let ancestors = PlacesUtils.nodeAncestors(aOldNode);
+      for (let ancestor of ancestors) {
+        if (!ancestor.containerOpen)
+          return -1;
+      }
+
+      return this._getRowForNode(aOldNode, true);
+    }
+
+    // There's a broken edge case here.
+    // If a visit appears in two queries, and the second one was
+    // the old node, we'll select the first one after refresh.  There's
+    // nothing we could do about that, because aOldNode.parent is
+    // gone by the time invalidateContainer is called.
+    let newNode = aUpdatedContainer.findNodeByDetails(aOldNode.uri,
+                                                      aOldNode.time,
+                                                      aOldNode.itemId,
+                                                      true);
+    if (!newNode)
+      return -1;
+
+    return this._getRowForNode(newNode, true);
+  },
+
+  /**
+   * Restores a given selection state as near as possible to the original
+   * selection state.
+   *
+   * @param aNodesInfo
+   *        The persisted selection state as returned by
+   *        _getSelectedNodesInRange.
+   * @param aUpdatedContainer
+   *        The container which was updated.
+   */
+  _restoreSelection:
+  function PTV__restoreSelection(aNodesInfo, aUpdatedContainer) {
+    if (aNodesInfo.length == 0)
+      return;
+
+    let selection = this.selection;
+
+    // Attempt to ensure that previously-visible selection will be visible
+    // if it's re-selected.  However, we can only ensure that for one row.
+    let scrollToRow = -1;
+    for (let i = 0; i < aNodesInfo.length; i++) {
+      let nodeInfo = aNodesInfo[i];
+      let row = this._getNewRowForRemovedNode(aUpdatedContainer,
+                                              nodeInfo.node);
+      // Select the found node, if any.
+      if (row != -1) {
+        selection.rangedSelect(row, row, true);
+        if (nodeInfo.wasVisible && scrollToRow == -1)
+          scrollToRow = row;
+      }
+    }
+
+    // If only one node was previously selected and there's no selection now,
+    // select the node at its old row, if any.
+    if (aNodesInfo.length == 1 && selection.count == 0) {
+      let row = Math.min(aNodesInfo[0].oldRow, this._rows.length - 1);
+      if (row != -1) {
+        selection.rangedSelect(row, row, true);
+        if (aNodesInfo[0].wasVisible && scrollToRow == -1)
+          scrollToRow = aNodesInfo[0].oldRow;
+      }
+    }
+
+    if (scrollToRow != -1)
+      this._tree.ensureRowIsVisible(scrollToRow);
+  },
+
+  _convertPRTimeToString: function PTV__convertPRTimeToString(aTime) {
+    const MS_PER_MINUTE = 60000;
+    const MS_PER_DAY = 86400000;
+    let timeMs = aTime / 1000; // PRTime is in microseconds
+
+    // Date is calculated starting from midnight, so the modulo with a day are
+    // milliseconds from today's midnight.
+    // getTimezoneOffset corrects that based on local time, notice midnight
+    // can have a different offset during DST-change days.
+    let dateObj = new Date();
+    let now = dateObj.getTime() - dateObj.getTimezoneOffset() * MS_PER_MINUTE;
+    let midnight = now - (now % MS_PER_DAY);
+    midnight += new Date(midnight).getTimezoneOffset() * MS_PER_MINUTE;
+
+    let dateFormat = timeMs >= midnight ?
+                      Ci.nsIScriptableDateFormat.dateFormatNone :
+                      Ci.nsIScriptableDateFormat.dateFormatShort;
+
+    let timeObj = new Date(timeMs);
+    return (this._dateService.FormatDateTime("", dateFormat,
+      Ci.nsIScriptableDateFormat.timeFormatNoSeconds,
+      timeObj.getFullYear(), timeObj.getMonth() + 1,
+      timeObj.getDate(), timeObj.getHours(),
+      timeObj.getMinutes(), timeObj.getSeconds()));
+  },
+
+  COLUMN_TYPE_UNKNOWN: 0,
+  COLUMN_TYPE_TITLE: 1,
+  COLUMN_TYPE_URI: 2,
+  COLUMN_TYPE_DATE: 3,
+  COLUMN_TYPE_VISITCOUNT: 4,
+  COLUMN_TYPE_KEYWORD: 5,
+  COLUMN_TYPE_DESCRIPTION: 6,
+  COLUMN_TYPE_DATEADDED: 7,
+  COLUMN_TYPE_LASTMODIFIED: 8,
+  COLUMN_TYPE_TAGS: 9,
+  COLUMN_TYPE_PARENTFOLDER: 10,
+  COLUMN_TYPE_PARENTFOLDERPATH: 11,
+
+  _getColumnType: function PTV__getColumnType(aColumn) {
+    let columnType = aColumn.element.getAttribute("anonid") || aColumn.id;
+
+    switch (columnType) {
+      case "title":
+        return this.COLUMN_TYPE_TITLE;
+      case "url":
+        return this.COLUMN_TYPE_URI;
+      case "date":
+        return this.COLUMN_TYPE_DATE;
+      case "visitCount":
+        return this.COLUMN_TYPE_VISITCOUNT;
+      case "keyword":
+        return this.COLUMN_TYPE_KEYWORD;
+      case "description":
+        return this.COLUMN_TYPE_DESCRIPTION;
+      case "dateAdded":
+        return this.COLUMN_TYPE_DATEADDED;
+      case "lastModified":
+        return this.COLUMN_TYPE_LASTMODIFIED;
+      case "tags":
+        return this.COLUMN_TYPE_TAGS;
+      case "parentFolder":
+        return this.COLUMN_TYPE_PARENTFOLDER;
+      case "parentFolderPath":
+        return this.COLUMN_TYPE_PARENTFOLDERPATH;
+    }
+    return this.COLUMN_TYPE_UNKNOWN;
+  },
+
+  _sortTypeToColumnType: function PTV__sortTypeToColumnType(aSortType) {
+    switch (aSortType) {
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_TITLE_ASCENDING:
+        return [this.COLUMN_TYPE_TITLE, false];
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_TITLE_DESCENDING:
+        return [this.COLUMN_TYPE_TITLE, true];
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_DATE_ASCENDING:
+        return [this.COLUMN_TYPE_DATE, false];
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_DATE_DESCENDING:
+        return [this.COLUMN_TYPE_DATE, true];
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_URI_ASCENDING:
+        return [this.COLUMN_TYPE_URI, false];
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_URI_DESCENDING:
+        return [this.COLUMN_TYPE_URI, true];
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_VISITCOUNT_ASCENDING:
+        return [this.COLUMN_TYPE_VISITCOUNT, false];
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_VISITCOUNT_DESCENDING:
+        return [this.COLUMN_TYPE_VISITCOUNT, true];
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_KEYWORD_ASCENDING:
+        return [this.COLUMN_TYPE_KEYWORD, false];
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_KEYWORD_DESCENDING:
+        return [this.COLUMN_TYPE_KEYWORD, true];
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_ANNOTATION_ASCENDING:
+        if (this._result.sortingAnnotation == PlacesUIUtils.DESCRIPTION_ANNO)
+          return [this.COLUMN_TYPE_DESCRIPTION, false];
+        break;
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_ANNOTATION_DESCENDING:
+        if (this._result.sortingAnnotation == PlacesUIUtils.DESCRIPTION_ANNO)
+          return [this.COLUMN_TYPE_DESCRIPTION, true];
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_DATEADDED_ASCENDING:
+        return [this.COLUMN_TYPE_DATEADDED, false];
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_DATEADDED_DESCENDING:
+        return [this.COLUMN_TYPE_DATEADDED, true];
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_LASTMODIFIED_ASCENDING:
+        return [this.COLUMN_TYPE_LASTMODIFIED, false];
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_LASTMODIFIED_DESCENDING:
+        return [this.COLUMN_TYPE_LASTMODIFIED, true];
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_TAGS_ASCENDING:
+        return [this.COLUMN_TYPE_TAGS, false];
+      case Ci.nsINavHistoryQueryOptions.SORT_BY_TAGS_DESCENDING:
+        return [this.COLUMN_TYPE_TAGS, true];
+    }
+    return [this.COLUMN_TYPE_UNKNOWN, false];
+  },
+
+  // nsINavHistoryResultObserver
+  nodeInserted: function PTV_nodeInserted(aParentNode, aNode, aNewIndex) {
+    NS_ASSERT(this._result, "Got a notification but have no result!");
+    if (!this._tree || !this._result)
+      return;
+
+    // Bail out for hidden separators.
+    if (PlacesUtils.nodeIsSeparator(aNode) && this.isSorted())
+      return;
+
+    let parentRow;
+    if (aParentNode != this._rootNode) {
+      parentRow = this._getRowForNode(aParentNode);
+
+      // Update parent when inserting the first item, since twisty has changed.
+      if (aParentNode.childCount == 1)
+        this._tree.invalidateRow(parentRow);
+    }
+
+    // Compute the new row number of the node.
+    let row = -1;
+    let cc = aParentNode.childCount;
+    if (aNewIndex == 0 || this._isPlainContainer(aParentNode) || cc == 0) {
+      // We don't need to worry about sub hierarchies of the parent node
+      // if it's a plain container, or if the new node is its first child.
+      if (aParentNode == this._rootNode)
+        row = aNewIndex;
+      else
+        row = parentRow + aNewIndex + 1;
+    }
+    else {
+      // Here, we try to find the next visible element in the child list so we
+      // can set the new visible index to be right before that.  Note that we
+      // have to search down instead of up, because some siblings could have
+      // children themselves that would be in the way.
+      let separatorsAreHidden = PlacesUtils.nodeIsSeparator(aNode) &&
+                                this.isSorted();
+      for (let i = aNewIndex + 1; i < cc; i++) {
+        let node = aParentNode.getChild(i);
+        if (!separatorsAreHidden || PlacesUtils.nodeIsSeparator(node)) {
+          // The children have not been shifted so the next item will have what
+          // should be our index.
+          row = this._getRowForNode(node, false, parentRow, i);
+          break;
+        }
+      }
+      if (row < 0) {
+        // At the end of the child list without finding a visible sibling. This
+        // is a little harder because we don't know how many rows the last item
+        // in our list takes up (it could be a container with many children).
+        let prevChild = aParentNode.getChild(aNewIndex - 1);
+        let prevIndex = this._getRowForNode(prevChild, false, parentRow,
+                                            aNewIndex - 1);
+        row = prevIndex + this._countVisibleRowsForNodeAtRow(prevIndex);
+      }
+    }
+
+    this._rows.splice(row, 0, aNode);
+    this._tree.rowCountChanged(row, 1);
+
+    if (PlacesUtils.nodeIsContainer(aNode) &&
+        PlacesUtils.asContainer(aNode).containerOpen) {
+      this.invalidateContainer(aNode);
+    }
+  },
+
+  /**
+   * THIS FUNCTION DOES NOT HANDLE cases where a collapsed node is being
+   * removed but the node it is collapsed with is not being removed (this then
+   * just swap out the removee with its collapsing partner). The only time
+   * when we really remove things is when deleting URIs, which will apply to
+   * all collapsees. This function is called sometimes when resorting items.
+   * However, we won't do this when sorted by date because dates will never
+   * change for visits, and date sorting is the only time things are collapsed.
+   */
+  nodeRemoved: function PTV_nodeRemoved(aParentNode, aNode, aOldIndex) {
+    NS_ASSERT(this._result, "Got a notification but have no result!");
+    if (!this._tree || !this._result)
+      return;
+
+    // XXX bug 517701: We don't know what to do when the root node is removed.
+    if (aNode == this._rootNode)
+      throw Cr.NS_ERROR_NOT_IMPLEMENTED;
+
+    // Bail out for hidden separators.
+    if (PlacesUtils.nodeIsSeparator(aNode) && this.isSorted())
+      return;
+
+    let parentRow = aParentNode == this._rootNode ?
+                    undefined : this._getRowForNode(aParentNode, true);
+    let oldRow = this._getRowForNode(aNode, true, parentRow, aOldIndex);
+    if (oldRow < 0)
+      throw Cr.NS_ERROR_UNEXPECTED;
+
+    // If the node was exclusively selected, the node next to it will be
+    // selected.
+    let selectNext = false;
+    let selection = this.selection;
+    if (selection.getRangeCount() == 1) {
+      let min = { }, max = { };
+      selection.getRangeAt(0, min, max);
+      if (min.value == max.value &&
+          this.nodeForTreeIndex(min.value) == aNode)
+        selectNext = true;
+    }
+
+    // Remove the node and its children, if any.
+    let count = this._countVisibleRowsForNodeAtRow(oldRow);
+    this._rows.splice(oldRow, count);
+    this._tree.rowCountChanged(oldRow, -count);
+
+    // Redraw the parent if its twisty state has changed.
+    if (aParentNode != this._rootNode && !aParentNode.hasChildren) {
+      let parentRow = oldRow - 1;
+      this._tree.invalidateRow(parentRow);
+    }
+
+    // Restore selection if the node was exclusively selected.
+    if (!selectNext)
+      return;
+
+    // Restore selection.
+    let rowToSelect = Math.min(oldRow, this._rows.length - 1);
+    if (rowToSelect != -1)
+      this.selection.rangedSelect(rowToSelect, rowToSelect, true);
+  },
+
+  nodeMoved:
+  function PTV_nodeMoved(aNode, aOldParent, aOldIndex, aNewParent, aNewIndex) {
+    NS_ASSERT(this._result, "Got a notification but have no result!");
+    if (!this._tree || !this._result)
+      return;
+
+    // Bail out for hidden separators.
+    if (PlacesUtils.nodeIsSeparator(aNode) && this.isSorted())
+      return;
+
+    // Note that at this point the node has already been moved by the backend,
+    // so we must give hints to _getRowForNode to get the old row position.
+    let oldParentRow = aOldParent == this._rootNode ?
+                         undefined : this._getRowForNode(aOldParent, true);
+    let oldRow = this._getRowForNode(aNode, true, oldParentRow, aOldIndex);
+    if (oldRow < 0)
+      throw Cr.NS_ERROR_UNEXPECTED;
+
+    // If this node is a container it could take up more than one row.
+    let count = this._countVisibleRowsForNodeAtRow(oldRow);
+
+    // Persist selection state.
+    let nodesToReselect =
+      this._getSelectedNodesInRange(oldRow, oldRow + count);
+    if (nodesToReselect.length > 0)
+      this.selection.selectEventsSuppressed = true;
+
+    // Redraw the parent if its twisty state has changed.
+    if (aOldParent != this._rootNode && !aOldParent.hasChildren) {
+      let parentRow = oldRow - 1;
+      this._tree.invalidateRow(parentRow);
+    }
+
+    // Remove node and its children, if any, from the old position.
+    this._rows.splice(oldRow, count);
+    this._tree.rowCountChanged(oldRow, -count);
+
+    // Insert the node into the new position.
+    this.nodeInserted(aNewParent, aNode, aNewIndex);
+
+    // Restore selection.
+    if (nodesToReselect.length > 0) {
+      this._restoreSelection(nodesToReselect, aNewParent);
+      this.selection.selectEventsSuppressed = false;
+    }
+  },
+
+  _invalidateCellValue: function PTV__invalidateCellValue(aNode,
+                                                          aColumnType) {
+    NS_ASSERT(this._result, "Got a notification but have no result!");
+    if (!this._tree || !this._result)
+      return;
+
+    // Nothing to do for the root node.
+    if (aNode == this._rootNode)
+      return;
+
+    let row = this._getRowForNode(aNode);
+    if (row == -1)
+      return;
+
+    let column = this._findColumnByType(aColumnType);
+    if (column && !column.element.hidden)
+      this._tree.invalidateCell(row, column);
+
+    // Last modified time is altered for almost all node changes.
+    if (aColumnType != this.COLUMN_TYPE_LASTMODIFIED) {
+      let lastModifiedColumn =
+        this._findColumnByType(this.COLUMN_TYPE_LASTMODIFIED);
+      if (lastModifiedColumn && !lastModifiedColumn.hidden)
+        this._tree.invalidateCell(row, lastModifiedColumn);
+    }
+  },
+
+  _populateLivemarkContainer: function PTV__populateLivemarkContainer(aNode) {
+    PlacesUtils.livemarks.getLivemark({ id: aNode.itemId })
+      .then(aLivemark => {
+        let placesNode = aNode;
+        // Need to check containerOpen since getLivemark is async.
+        if (!placesNode.containerOpen)
+          return;
+
+        let children = aLivemark.getNodesForContainer(placesNode);
+        for (let i = 0; i < children.length; i++) {
+          let child = children[i];
+          this.nodeInserted(placesNode, child, i);
+        }
+      }, Components.utils.reportError);
+  },
+
+  nodeTitleChanged: function PTV_nodeTitleChanged(aNode, aNewTitle) {
+    this._invalidateCellValue(aNode, this.COLUMN_TYPE_TITLE);
+  },
+
+  nodeURIChanged: function PTV_nodeURIChanged(aNode, aNewURI) {
+    this._invalidateCellValue(aNode, this.COLUMN_TYPE_URI);
+  },
+
+  nodeIconChanged: function PTV_nodeIconChanged(aNode) {
+    this._invalidateCellValue(aNode, this.COLUMN_TYPE_TITLE);
+  },
+
+  nodeHistoryDetailsChanged:
+  function PTV_nodeHistoryDetailsChanged(aNode, aUpdatedVisitDate,
+                                         aUpdatedVisitCount) {
+    if (aNode.parent && this._controller.hasCachedLivemarkInfo(aNode.parent)) {
+      // Find the node in the parent.
+      let parentRow = this._flatList ? 0 : this._getRowForNode(aNode.parent);
+      for (let i = parentRow; i < this._rows.length; i++) {
+        let child = this.nodeForTreeIndex(i);
+        if (child.uri == aNode.uri) {
+          this._cellProperties.delete(child);
+          this._invalidateCellValue(child, this.COLUMN_TYPE_TITLE);
+          break;
+        }
+      }
+      return;
+    }
+
+    this._invalidateCellValue(aNode, this.COLUMN_TYPE_DATE);
+    this._invalidateCellValue(aNode, this.COLUMN_TYPE_VISITCOUNT);
+  },
+
+  nodeTagsChanged: function PTV_nodeTagsChanged(aNode) {
+    this._invalidateCellValue(aNode, this.COLUMN_TYPE_TAGS);
+  },
+
+  nodeKeywordChanged: function PTV_nodeKeywordChanged(aNode, aNewKeyword) {
+    this._invalidateCellValue(aNode, this.COLUMN_TYPE_KEYWORD);
+  },
+
+  nodeAnnotationChanged: function PTV_nodeAnnotationChanged(aNode, aAnno) {
+    if (aAnno == PlacesUIUtils.DESCRIPTION_ANNO) {
+      this._invalidateCellValue(aNode, this.COLUMN_TYPE_DESCRIPTION);
+    }
+    else if (aAnno == PlacesUtils.LMANNO_FEEDURI) {
+      PlacesUtils.livemarks.getLivemark({ id: aNode.itemId })
+        .then(aLivemark => {
+          this._controller.cacheLivemarkInfo(aNode, aLivemark);
+          let properties = this._cellProperties.get(aNode);
+          this._cellProperties.set(aNode, properties += " livemark");
+          // The livemark attribute is set as a cell property on the title cell.
+          this._invalidateCellValue(aNode, this.COLUMN_TYPE_TITLE);
+        }, Components.utils.reportError);
+    }
+  },
+
+  nodeDateAddedChanged: function PTV_nodeDateAddedChanged(aNode, aNewValue) {
+    this._invalidateCellValue(aNode, this.COLUMN_TYPE_DATEADDED);
+  },
+
+  nodeLastModifiedChanged:
+  function PTV_nodeLastModifiedChanged(aNode, aNewValue) {
+    this._invalidateCellValue(aNode, this.COLUMN_TYPE_LASTMODIFIED);
+  },
+
+  containerStateChanged:
+  function PTV_containerStateChanged(aNode, aOldState, aNewState) {
+    this.invalidateContainer(aNode);
+
+    if (PlacesUtils.nodeIsFolder(aNode) ||
+        (this._flatList && aNode == this._rootNode)) {
+      let queryOptions = PlacesUtils.asQuery(this._rootNode).queryOptions;
+      if (queryOptions.excludeItems) {
+        return;
+      }
+      if (aNode.itemId != -1) { // run when there's a valid node id
+        PlacesUtils.livemarks.getLivemark({ id: aNode.itemId })
+          .then(aLivemark => {
+            let shouldInvalidate =
+              !this._controller.hasCachedLivemarkInfo(aNode);
+            this._controller.cacheLivemarkInfo(aNode, aLivemark);
+            if (aNewState == Components.interfaces.nsINavHistoryContainerResultNode.STATE_OPENED) {
+              aLivemark.registerForUpdates(aNode, this);
+              // Prioritize the current livemark.
+              aLivemark.reload();
+              PlacesUtils.livemarks.reloadLivemarks();
+              if (shouldInvalidate)
+                this.invalidateContainer(aNode);
+            }
+            else {
+              aLivemark.unregisterForUpdates(aNode);
+            }
+          }, () => undefined);
+      }
+    }
+  },
+
+  invalidateContainer: function PTV_invalidateContainer(aContainer) {
+    NS_ASSERT(this._result, "Need to have a result to update");
+    if (!this._tree)
+      return;
+
+    let startReplacement, replaceCount;
+    if (aContainer == this._rootNode) {
+      startReplacement = 0;
+      replaceCount = this._rows.length;
+
+      // If the root node is now closed, the tree is empty.
+      if (!this._rootNode.containerOpen) {
+        this._rows = [];
+        if (replaceCount)
+          this._tree.rowCountChanged(startReplacement, -replaceCount);
+
+        return;
+      }
+    }
+    else {
+      // Update the twisty state.
+      let row = this._getRowForNode(aContainer);
+      this._tree.invalidateRow(row);
+
+      // We don't replace the container node itself, so we should decrease the
+      // replaceCount by 1.
+      startReplacement = row + 1;
+      replaceCount = this._countVisibleRowsForNodeAtRow(row) - 1;
+    }
+
+    // Persist selection state.
+    let nodesToReselect =
+      this._getSelectedNodesInRange(startReplacement,
+                                    startReplacement + replaceCount);
+
+    // Now update the number of elements.
+    this.selection.selectEventsSuppressed = true;
+
+    // First remove the old elements
+    this._rows.splice(startReplacement, replaceCount);
+
+    // If the container is now closed, we're done.
+    if (!aContainer.containerOpen) {
+      let oldSelectionCount = this.selection.count;
+      if (replaceCount)
+        this._tree.rowCountChanged(startReplacement, -replaceCount);
+
+      // Select the row next to the closed container if any of its
+      // children were selected, and nothing else is selected.
+      if (nodesToReselect.length > 0 &&
+          nodesToReselect.length == oldSelectionCount) {
+        this.selection.rangedSelect(startReplacement, startReplacement, true);
+        this._tree.ensureRowIsVisible(startReplacement);
+      }
+
+      this.selection.selectEventsSuppressed = false;
+      return;
+    }
+
+    // Otherwise, start a batch first.
+    this._tree.beginUpdateBatch();
+    if (replaceCount)
+      this._tree.rowCountChanged(startReplacement, -replaceCount);
+
+    let toOpenElements = [];
+    let elementsAddedCount = this._buildVisibleSection(aContainer,
+                                                       startReplacement,
+                                                       toOpenElements);
+    if (elementsAddedCount)
+      this._tree.rowCountChanged(startReplacement, elementsAddedCount);
+
+    if (!this._flatList) {
+      // Now, open any containers that were persisted.
+      for (let i = 0; i < toOpenElements.length; i++) {
+        let item = toOpenElements[i];
+        let parent = item.parent;
+
+        // Avoid recursively opening containers.
+        while (parent) {
+          if (parent.uri == item.uri)
+            break;
+          parent = parent.parent;
+        }
+
+        // If we don't have a parent, we made it all the way to the root
+        // and didn't find a match, so we can open our item.
+        if (!parent && !item.containerOpen)
+          item.containerOpen = true;
+      }
+    }
+
+    if (this._controller.hasCachedLivemarkInfo(aContainer)) {
+      let queryOptions = PlacesUtils.asQuery(this._result.root).queryOptions;
+      if (!queryOptions.excludeItems) {
+        this._populateLivemarkContainer(aContainer);
+      }
+    }
+
+    this._tree.endUpdateBatch();
+
+    // Restore selection.
+    this._restoreSelection(nodesToReselect, aContainer);
+    this.selection.selectEventsSuppressed = false;
+  },
+
+  _columns: [],
+  _findColumnByType: function PTV__findColumnByType(aColumnType) {
+    if (this._columns[aColumnType])
+      return this._columns[aColumnType];
+
+    let columns = this._tree.columns;
+    let colCount = columns.count;
+    for (let i = 0; i < colCount; i++) {
+      let column = columns.getColumnAt(i);
+      let columnType = this._getColumnType(column);
+      this._columns[columnType] = column;
+      if (columnType == aColumnType)
+        return column;
+    }
+
+    // That's completely valid.  Most of our trees actually include just the
+    // title column.
+    return null;
+  },
+
+  sortingChanged: function PTV__sortingChanged(aSortingMode) {
+    if (!this._tree || !this._result)
+      return;
+
+    // Depending on the sort mode, certain commands may be disabled.
+    window.updateCommands("sort");
+
+    let columns = this._tree.columns;
+
+    // Clear old sorting indicator.
+    let sortedColumn = columns.getSortedColumn();
+    if (sortedColumn)
+      sortedColumn.element.removeAttribute("sortDirection");
+
+    // Set new sorting indicator by looking through all columns for ours.
+    if (aSortingMode == Ci.nsINavHistoryQueryOptions.SORT_BY_NONE)
+      return;
+
+    let [desiredColumn, desiredIsDescending] =
+      this._sortTypeToColumnType(aSortingMode);
+    let colCount = columns.count;
+    let column = this._findColumnByType(desiredColumn);
+    if (column) {
+      let sortDir = desiredIsDescending ? "descending" : "ascending";
+      column.element.setAttribute("sortDirection", sortDir);
+    }
+  },
+
+  _inBatchMode: false,
+  batching: function PTV__batching(aToggleMode) {
+    if (this._inBatchMode != aToggleMode) {
+      this._inBatchMode = this.selection.selectEventsSuppressed = aToggleMode;
+      if (this._inBatchMode) {
+        this._tree.beginUpdateBatch();
+      }
+      else {
+        this._tree.endUpdateBatch();
+      }
+    }
+  },
+
+  get result() this._result,
+  set result(val) {
+    if (this._result) {
+      this._result.removeObserver(this);
+      this._rootNode.containerOpen = false;
+    }
+
+    if (val) {
+      this._result = val;
+      this._rootNode = this._result.root;
+      this._cellProperties = new Map();
+      this._cuttingNodes = new Set();
+    }
+    else if (this._result) {
+      delete this._result;
+      delete this._rootNode;
+      delete this._cellProperties;
+      delete this._cuttingNodes;
+    }
+
+    // If the tree is not set yet, setTree will call finishInit.
+    if (this._tree && val)
+      this._finishInit();
+
+    return val;
+  },
+
+  nodeForTreeIndex: function PTV_nodeForTreeIndex(aIndex) {
+    if (aIndex > this._rows.length)
+      throw Cr.NS_ERROR_INVALID_ARG;
+
+    return this._getNodeForRow(aIndex);
+  },
+
+  treeIndexForNode: function PTV_treeNodeForIndex(aNode) {
+    // The API allows passing invisible nodes.
+    try {
+      return this._getRowForNode(aNode, true);
+    }
+    catch(ex) { }
+
+    return Ci.nsINavHistoryResultTreeViewer.INDEX_INVISIBLE;
+  },
+
+  _getResourceForNode: function PTV_getResourceForNode(aNode)
+  {
+    let uri = aNode.uri;
+    NS_ASSERT(uri, "if there is no uri, we can't persist the open state");
+    return uri ? PlacesUIUtils.RDF.GetResource(uri) : null;
+  },
+
+  // nsITreeView
+  get rowCount() this._rows.length,
+  get selection() this._selection,
+  set selection(val) this._selection = val,
+
+  getRowProperties: function() { return ""; },
+
+  getCellProperties:
+  function PTV_getCellProperties(aRow, aColumn) {
+    // for anonid-trees, we need to add the column-type manually
+    var props = "";
+    let columnType = aColumn.element.getAttribute("anonid");
+    if (columnType)
+      props += columnType;
+    else
+      columnType = aColumn.id;
+
+    // Set the "ltr" property on url cells
+    if (columnType == "url")
+      props += " ltr";
+
+    if (columnType != "title")
+      return props;
+
+    let node = this._getNodeForRow(aRow);
+
+    if (this._cuttingNodes.has(node)) {
+      props += " cutting";
+    }
+
+    let properties = this._cellProperties.get(node);
+    if (properties === undefined) {
+      properties = "";
+      let itemId = node.itemId;
+      let nodeType = node.type;
+      if (PlacesUtils.containerTypes.indexOf(nodeType) != -1) {
+        if (nodeType == Ci.nsINavHistoryResultNode.RESULT_TYPE_QUERY) {
+          properties += " query";
+          if (PlacesUtils.nodeIsTagQuery(node))
+            properties += " tagContainer";
+          else if (PlacesUtils.nodeIsDay(node))
+            properties += " dayContainer";
+          else if (PlacesUtils.nodeIsHost(node))
+            properties += " hostContainer";
+        }
+        else if (nodeType == Ci.nsINavHistoryResultNode.RESULT_TYPE_FOLDER ||
+                 nodeType == Ci.nsINavHistoryResultNode.RESULT_TYPE_FOLDER_SHORTCUT) {
+          if (this._controller.hasCachedLivemarkInfo(node)) {
+            properties += " livemark";
+          }
+          else {
+            PlacesUtils.livemarks.getLivemark({ id: node.itemId })
+              .then(aLivemark => {
+                this._controller.cacheLivemarkInfo(node, aLivemark);
+                let props = this._cellProperties.get(node); 
+                this._cellProperties.set(node, props += " livemark");
+                // The livemark attribute is set as a cell property on the title cell.
+                this._invalidateCellValue(node, this.COLUMN_TYPE_TITLE);
+              }, () => undefined);
+          }
+        }
+
+        if (itemId != -1) {
+          let queryName = PlacesUIUtils.getLeftPaneQueryNameFromId(itemId);
+          if (queryName)
+            properties += " OrganizerQuery_" + queryName;
+        }
+      }
+      else if (nodeType == Ci.nsINavHistoryResultNode.RESULT_TYPE_SEPARATOR)
+        properties += " separator";
+      else if (PlacesUtils.nodeIsURI(node)) {
+        properties += " " + PlacesUIUtils.guessUrlSchemeForUI(node.uri);
+
+        if (this._controller.hasCachedLivemarkInfo(node.parent)) {
+          properties += " livemarkItem";
+          if (node.accessCount) {
+            properties += " visited";
+          }
+        }
+      }
+
+      this._cellProperties.set(node, properties);
+    }
+
+    return props + " " + properties;
+  },
+
+  getColumnProperties: function(aColumn) { return ""; },
+
+  isContainer: function PTV_isContainer(aRow) {
+    // Only leaf nodes aren't listed in the rows array.
+    let node = this._rows[aRow];
+    if (node === undefined)
+      return false;
+
+    if (PlacesUtils.nodeIsContainer(node)) {
+      // Flat-lists may ignore expandQueries and other query options when
+      // they are asked to open a container.
+      if (this._flatList)
+        return true;
+
+      // treat non-expandable childless queries as non-containers
+      if (PlacesUtils.nodeIsQuery(node)) {
+        let parent = node.parent;
+        if ((PlacesUtils.nodeIsQuery(parent) ||
+             PlacesUtils.nodeIsFolder(parent)) &&
+            !PlacesUtils.asQuery(node).hasChildren)
+          return PlacesUtils.asQuery(parent).queryOptions.expandQueries;
+      }
+      return true;
+    }
+    return false;
+  },
+
+  isContainerOpen: function PTV_isContainerOpen(aRow) {
+    if (this._flatList)
+      return false;
+
+    // All containers are listed in the rows array.
+    return this._rows[aRow].containerOpen;
+  },
+
+  isContainerEmpty: function PTV_isContainerEmpty(aRow) {
+    if (this._flatList)
+      return true;
+
+    let node = this._rows[aRow];
+    if (this._controller.hasCachedLivemarkInfo(node)) {
+      let queryOptions = PlacesUtils.asQuery(this._result.root).queryOptions;
+      return queryOptions.excludeItems;
+    }
+
+    // All containers are listed in the rows array.
+    return !node.hasChildren;
+  },
+
+  isSeparator: function PTV_isSeparator(aRow) {
+    // All separators are listed in the rows array.
+    let node = this._rows[aRow];
+    return node && PlacesUtils.nodeIsSeparator(node);
+  },
+
+  isSorted: function PTV_isSorted() {
+    return this._result.sortingMode !=
+           Ci.nsINavHistoryQueryOptions.SORT_BY_NONE;
+  },
+
+  canDrop: function PTV_canDrop(aRow, aOrientation, aDataTransfer) {
+    if (!this._result)
+      throw Cr.NS_ERROR_UNEXPECTED;
+
+    // Drop position into a sorted treeview would be wrong.
+    if (this.isSorted())
+      return false;
+
+    let ip = this._getInsertionPoint(aRow, aOrientation);
+    return ip && PlacesControllerDragHelper.canDrop(ip, aDataTransfer);
+  },
+
+  _getInsertionPoint: function PTV__getInsertionPoint(index, orientation) {
+    let container = this._result.root;
+    let dropNearItemId = -1;
+    // When there's no selection, assume the container is the container
+    // the view is populated from (i.e. the result's itemId).
+    if (index != -1) {
+      let lastSelected = this.nodeForTreeIndex(index);
+      if (this.isContainer(index) && orientation == Ci.nsITreeView.DROP_ON) {
+        // If the last selected item is an open container, append _into_
+        // it, rather than insert adjacent to it.
+        container = lastSelected;
+        index = -1;
+      }
+      else if (lastSelected.containerOpen &&
+               orientation == Ci.nsITreeView.DROP_AFTER &&
+               lastSelected.hasChildren) {
+        // If the last selected node is an open container and the user is
+        // trying to drag into it as a first node, really insert into it.
+        container = lastSelected;
+        orientation = Ci.nsITreeView.DROP_ON;
+        index = 0;
+      }
+      else {
+        // Use the last-selected node's container.
+        container = lastSelected.parent;
+
+        // During its Drag & Drop operation, the tree code closes-and-opens
+        // containers very often (part of the XUL "spring-loaded folders"
+        // implementation).  And in certain cases, we may reach a closed
+        // container here.  However, we can simply bail out when this happens,
+        // because we would then be back here in less than a millisecond, when
+        // the container had been reopened.
+        if (!container || !container.containerOpen)
+          return null;
+
+        // Avoid the potentially expensive call to getChildIndex
+        // if we know this container doesn't allow insertion.
+        if (PlacesControllerDragHelper.disallowInsertion(container))
+          return null;
+
+        let queryOptions = PlacesUtils.asQuery(this._result.root).queryOptions;
+        if (queryOptions.sortingMode !=
+              Ci.nsINavHistoryQueryOptions.SORT_BY_NONE) {
+          // If we are within a sorted view, insert at the end.
+          index = -1;
+        }
+        else if (queryOptions.excludeItems ||
+                 queryOptions.excludeQueries ||
+                 queryOptions.excludeReadOnlyFolders) {
+          // Some item may be invisible, insert near last selected one.
+          // We don't replace index here to avoid requests to the db,
+          // instead it will be calculated later by the controller.
+          index = -1;
+          dropNearItemId = lastSelected.itemId;
+        }
+        else {
+          let lsi = container.getChildIndex(lastSelected);
+          index = orientation == Ci.nsITreeView.DROP_BEFORE ? lsi : lsi + 1;
+        }
+      }
+    }
+
+    if (PlacesControllerDragHelper.disallowInsertion(container))
+      return null;
+
+    return new InsertionPoint(PlacesUtils.getConcreteItemId(container),
+                              index, orientation,
+                              PlacesUtils.nodeIsTagQuery(container),
+                              dropNearItemId);
+  },
+
+  drop: function PTV_drop(aRow, aOrientation, aDataTransfer) {
+    // We are responsible for translating the |index| and |orientation|
+    // parameters into a container id and index within the container,
+    // since this information is specific to the tree view.
+    let ip = this._getInsertionPoint(aRow, aOrientation);
+    if (ip)
+      PlacesControllerDragHelper.onDrop(ip, aDataTransfer);
+
+    PlacesControllerDragHelper.currentDropTarget = null;
+  },
+
+  getParentIndex: function PTV_getParentIndex(aRow) {
+    let [parentNode, parentRow] = this._getParentByChildRow(aRow);
+    return parentRow;
+  },
+
+  hasNextSibling: function PTV_hasNextSibling(aRow, aAfterIndex) {
+    if (aRow == this._rows.length - 1) {
+      // The last row has no sibling.
+      return false;
+    }
+
+    let node = this._rows[aRow];
+    if (node === undefined || this._isPlainContainer(node.parent)) {
+      // The node is a child of a plain container.
+      // If the next row is either unset or has the same parent,
+      // it's a sibling.
+      let nextNode = this._rows[aRow + 1];
+      return (nextNode == undefined || nextNode.parent == node.parent);
+    }
+
+    let thisLevel = node.indentLevel;
+    for (let i = aAfterIndex + 1; i < this._rows.length; ++i) {
+      let rowNode = this._getNodeForRow(i);
+      let nextLevel = rowNode.indentLevel;
+      if (nextLevel == thisLevel)
+        return true;
+      if (nextLevel < thisLevel)
+        break;
+    }
+
+    return false;
+  },
+
+  getLevel: function(aRow) this._getNodeForRow(aRow).indentLevel,
+
+  getImageSrc: function PTV_getImageSrc(aRow, aColumn) {
+    // Only the title column has an image.
+    if (this._getColumnType(aColumn) != this.COLUMN_TYPE_TITLE)
+      return "";
+
+    return this._getNodeForRow(aRow).icon;
+  },
+
+  getProgressMode: function(aRow, aColumn) { },
+  getCellValue: function(aRow, aColumn) { },
+
+  getCellText: function PTV_getCellText(aRow, aColumn) {
+    let node = this._getNodeForRow(aRow);
+    switch (this._getColumnType(aColumn)) {
+      case this.COLUMN_TYPE_TITLE:
+        // normally, this is just the title, but we don't want empty items in
+        // the tree view so return a special string if the title is empty.
+        // Do it here so that callers can still get at the 0 length title
+        // if they go through the "result" API.
+        if (PlacesUtils.nodeIsSeparator(node))
+          return "";
+        return PlacesUIUtils.getBestTitle(node, true);
+      case this.COLUMN_TYPE_TAGS:
+        return node.tags;
+      case this.COLUMN_TYPE_URI:
+        if (PlacesUtils.nodeIsURI(node))
+          return node.uri;
+        return "";
+      case this.COLUMN_TYPE_DATE:
+        let nodeTime = node.time;
+        if (nodeTime == 0 || !PlacesUtils.nodeIsURI(node)) {
+          // hosts and days shouldn't have a value for the date column.
+          // Actually, you could argue this point, but looking at the
+          // results, seeing the most recently visited date is not what
+          // I expect, and gives me no information I know how to use.
+          // Only show this for URI-based items.
+          return "";
+        }
+
+        return this._convertPRTimeToString(nodeTime);
+      case this.COLUMN_TYPE_VISITCOUNT:
+        return node.accessCount;
+      case this.COLUMN_TYPE_KEYWORD:
+        if (PlacesUtils.nodeIsBookmark(node))
+          return PlacesUtils.bookmarks.getKeywordForBookmark(node.itemId);
+        return "";
+      case this.COLUMN_TYPE_DESCRIPTION:
+        if (node.itemId != -1) {
+          try {
+            return PlacesUtils.annotations.
+                               getItemAnnotation(node.itemId, PlacesUIUtils.DESCRIPTION_ANNO);
+          }
+          catch (ex) { /* has no description */ }
+        }
+        return "";
+      case this.COLUMN_TYPE_DATEADDED:
+        if (node.dateAdded)
+          return this._convertPRTimeToString(node.dateAdded);
+        return "";
+      case this.COLUMN_TYPE_LASTMODIFIED:
+        if (node.lastModified)
+          return this._convertPRTimeToString(node.lastModified);
+        return "";
+      case this.COLUMN_TYPE_PARENTFOLDER:
+        if (PlacesUtils.nodeIsQuery(node.parent) &&
+            PlacesUtils.asQuery(node.parent).queryOptions.queryType ==
+              Components.interfaces.nsINavHistoryQueryOptions.QUERY_TYPE_HISTORY && node.uri)
+          return "";
+        var bmsvc = Components.classes["@mozilla.org/browser/nav-bookmarks-service;1"].
+                               getService(Components.interfaces.nsINavBookmarksService);
+        var rowId = node.itemId;
+        try {
+          var parentFolderId = bmsvc.getFolderIdForItem(rowId);
+          var folderTitle = bmsvc.getItemTitle(parentFolderId);
+        } catch(ex) {
+          var folderTitle = "";
+        }
+        return folderTitle;
+      case this.COLUMN_TYPE_PARENTFOLDERPATH:
+        if (PlacesUtils.nodeIsQuery(node.parent) &&
+            PlacesUtils.asQuery(node.parent).queryOptions.queryType ==
+              Components.interfaces.nsINavHistoryQueryOptions.QUERY_TYPE_HISTORY && node.uri)
+          return "";
+        var bmsvc = Components.classes["@mozilla.org/browser/nav-bookmarks-service;1"].
+                               getService(Components.interfaces.nsINavBookmarksService);
+        var rowId = node.itemId;
+        try {
+          var FolderId;
+          var parentFolderId = bmsvc.getFolderIdForItem(rowId);
+          var folderTitle = bmsvc.getItemTitle(parentFolderId);
+          while ((FolderId = bmsvc.getFolderIdForItem(parentFolderId))) {
+            if (FolderId == parentFolderId)
+              break;
+            parentFolderId = FolderId;
+            var text = bmsvc.getItemTitle(parentFolderId);
+            if (!text)
+              break;
+            folderTitle = text + " /"+ folderTitle;
+          }
+          folderTitle = folderTitle.replace(/^\s/,"");
+        } catch(ex) {
+          var folderTitle = "";
+        }
+        return folderTitle;
+    }
+    return "";
+  },
+
+  setTree: function PTV_setTree(aTree) {
+    // If we are replacing the tree during a batch, there is a concrete risk
+    // that the treeView goes out of sync, thus it's safer to end the batch now.
+    // This is a no-op if we are not batching.
+    this.batching(false);
+
+    let hasOldTree = this._tree != null;
+    this._tree = aTree;
+
+    if (this._result) {
+      if (hasOldTree) {
+        // detach from result when we are detaching from the tree.
+        // This breaks the reference cycle between us and the result.
+        if (!aTree) {
+          this._result.removeObserver(this);
+          this._rootNode.containerOpen = false;
+        }
+      }
+      if (aTree)
+        this._finishInit();
+    }
+  },
+
+  toggleOpenState: function PTV_toggleOpenState(aRow) {
+    if (!this._result)
+      throw Cr.NS_ERROR_UNEXPECTED;
+
+    let node = this._rows[aRow];
+    if (this._flatList && this._openContainerCallback) {
+      this._openContainerCallback(node);
+      return;
+    }
+
+    // Persist containers open status, but never persist livemarks.
+    if (!this._controller.hasCachedLivemarkInfo(node)) {
+      let resource = this._getResourceForNode(node);
+      if (resource) {
+        const openLiteral = PlacesUIUtils.RDF.GetResource("http://home.netscape.com/NC-rdf#open");
+        const trueLiteral = PlacesUIUtils.RDF.GetLiteral("true");
+
+        if (node.containerOpen)
+          PlacesUIUtils.localStore.Unassert(resource, openLiteral, trueLiteral);
+        else
+          PlacesUIUtils.localStore.Assert(resource, openLiteral, trueLiteral, true);
+      }
+    }
+
+    node.containerOpen = !node.containerOpen;
+  },
+
+  cycleHeader: function PTV_cycleHeader(aColumn) {
+    if (!this._result)
+      throw Cr.NS_ERROR_UNEXPECTED;
+
+    // Sometimes you want a tri-state sorting, and sometimes you don't. This
+    // rule allows tri-state sorting when the root node is a folder. This will
+    // catch the most common cases. When you are looking at folders, you want
+    // the third state to reset the sorting to the natural bookmark order. When
+    // you are looking at history, that third state has no meaning so we try
+    // to disallow it.
+    //
+    // The problem occurs when you have a query that results in bookmark
+    // folders. One example of this is the subscriptions view. In these cases,
+    // this rule doesn't allow you to sort those sub-folders by their natural
+    // order.
+    let allowTriState = PlacesUtils.nodeIsFolder(this._result.root);
+
+    let oldSort = this._result.sortingMode;
+    let oldSortingAnnotation = this._result.sortingAnnotation;
+    let newSort;
+    let newSortingAnnotation = "";
+    const NHQO = Ci.nsINavHistoryQueryOptions;
+    switch (this._getColumnType(aColumn)) {
+      case this.COLUMN_TYPE_TITLE:
+        if (oldSort == NHQO.SORT_BY_TITLE_ASCENDING)
+          newSort = NHQO.SORT_BY_TITLE_DESCENDING;
+        else if (allowTriState && oldSort == NHQO.SORT_BY_TITLE_DESCENDING)
+          newSort = NHQO.SORT_BY_NONE;
+        else
+          newSort = NHQO.SORT_BY_TITLE_ASCENDING;
+
+        break;
+      case this.COLUMN_TYPE_URI:
+        if (oldSort == NHQO.SORT_BY_URI_ASCENDING)
+          newSort = NHQO.SORT_BY_URI_DESCENDING;
+        else if (allowTriState && oldSort == NHQO.SORT_BY_URI_DESCENDING)
+          newSort = NHQO.SORT_BY_NONE;
+        else
+          newSort = NHQO.SORT_BY_URI_ASCENDING;
+
+        break;
+      case this.COLUMN_TYPE_DATE:
+        if (oldSort == NHQO.SORT_BY_DATE_ASCENDING)
+          newSort = NHQO.SORT_BY_DATE_DESCENDING;
+        else if (allowTriState &&
+                 oldSort == NHQO.SORT_BY_DATE_DESCENDING)
+          newSort = NHQO.SORT_BY_NONE;
+        else
+          newSort = NHQO.SORT_BY_DATE_ASCENDING;
+
+        break;
+      case this.COLUMN_TYPE_VISITCOUNT:
+        // visit count default is unusual because we sort by descending
+        // by default because you are most likely to be looking for
+        // highly visited sites when you click it
+        if (oldSort == NHQO.SORT_BY_VISITCOUNT_DESCENDING)
+          newSort = NHQO.SORT_BY_VISITCOUNT_ASCENDING;
+        else if (allowTriState && oldSort == NHQO.SORT_BY_VISITCOUNT_ASCENDING)
+          newSort = NHQO.SORT_BY_NONE;
+        else
+          newSort = NHQO.SORT_BY_VISITCOUNT_DESCENDING;
+
+        break;
+      case this.COLUMN_TYPE_KEYWORD:
+        if (oldSort == NHQO.SORT_BY_KEYWORD_ASCENDING)
+          newSort = NHQO.SORT_BY_KEYWORD_DESCENDING;
+        else if (allowTriState && oldSort == NHQO.SORT_BY_KEYWORD_DESCENDING)
+          newSort = NHQO.SORT_BY_NONE;
+        else
+          newSort = NHQO.SORT_BY_KEYWORD_ASCENDING;
+
+        break;
+      case this.COLUMN_TYPE_DESCRIPTION:
+        if (oldSort == NHQO.SORT_BY_ANNOTATION_ASCENDING &&
+            oldSortingAnnotation == PlacesUIUtils.DESCRIPTION_ANNO) {
+          newSort = NHQO.SORT_BY_ANNOTATION_DESCENDING;
+          newSortingAnnotation = PlacesUIUtils.DESCRIPTION_ANNO;
+        }
+        else if (allowTriState &&
+                 oldSort == NHQO.SORT_BY_ANNOTATION_DESCENDING &&
+                 oldSortingAnnotation == PlacesUIUtils.DESCRIPTION_ANNO)
+          newSort = NHQO.SORT_BY_NONE;
+        else {
+          newSort = NHQO.SORT_BY_ANNOTATION_ASCENDING;
+          newSortingAnnotation = PlacesUIUtils.DESCRIPTION_ANNO;
+        }
+
+        break;
+      case this.COLUMN_TYPE_DATEADDED:
+        if (oldSort == NHQO.SORT_BY_DATEADDED_ASCENDING)
+          newSort = NHQO.SORT_BY_DATEADDED_DESCENDING;
+        else if (allowTriState &&
+                 oldSort == NHQO.SORT_BY_DATEADDED_DESCENDING)
+          newSort = NHQO.SORT_BY_NONE;
+        else
+          newSort = NHQO.SORT_BY_DATEADDED_ASCENDING;
+
+        break;
+      case this.COLUMN_TYPE_LASTMODIFIED:
+        if (oldSort == NHQO.SORT_BY_LASTMODIFIED_ASCENDING)
+          newSort = NHQO.SORT_BY_LASTMODIFIED_DESCENDING;
+        else if (allowTriState &&
+                 oldSort == NHQO.SORT_BY_LASTMODIFIED_DESCENDING)
+          newSort = NHQO.SORT_BY_NONE;
+        else
+          newSort = NHQO.SORT_BY_LASTMODIFIED_ASCENDING;
+
+        break;
+      case this.COLUMN_TYPE_TAGS:
+        if (oldSort == NHQO.SORT_BY_TAGS_ASCENDING)
+          newSort = NHQO.SORT_BY_TAGS_DESCENDING;
+        else if (allowTriState && oldSort == NHQO.SORT_BY_TAGS_DESCENDING)
+          newSort = NHQO.SORT_BY_NONE;
+        else
+          newSort = NHQO.SORT_BY_TAGS_ASCENDING;
+
+        break;
+      case this.COLUMN_TYPE_PARENTFOLDER:
+        return;
+
+        break;
+      case this.COLUMN_TYPE_PARENTFOLDERPATH:
+        return;
+
+        break;
+      default:
+        throw Cr.NS_ERROR_INVALID_ARG;
+    }
+    this._result.sortingAnnotation = newSortingAnnotation;
+    this._result.sortingMode = newSort;
+  },
+
+  isEditable: function PTV_isEditable(aRow, aColumn) {
+    // At this point we only support editing the title field.
+    if (aColumn.index != 0)
+      return false;
+
+    let node = this._rows[aRow];
+    if (!node) {
+      Cu.reportError("isEditable called for an unbuilt row.");
+      return false;
+    }
+    let itemId = node.itemId;
+
+    // Only bookmark-nodes are editable.  Fortunately, this check also takes
+    // care of livemark children.
+    if (itemId == -1)
+      return false;
+
+    // The following items are also not editable, even though they are bookmark
+    // items.
+    // * places-roots
+    // * the left pane special folders and queries (those are place: uri
+    //   bookmarks)
+    // * separators
+    //
+    // Note that concrete itemIds aren't used intentionally.  For example, we
+    // have no reason to disallow renaming a shortcut to the Bookmarks Toolbar,
+    // except for the one under All Bookmarks.
+    if (PlacesUtils.nodeIsSeparator(node) || PlacesUtils.isRootItem(itemId))
+      return false;
+
+    let parentId = PlacesUtils.getConcreteItemId(node.parent);
+    if (parentId == PlacesUIUtils.leftPaneFolderId ||
+        parentId == PlacesUIUtils.allBookmarksFolderId) {
+      // Note that the for the time being this is the check that actually
+      // blocks renaming places "roots", and not the isRootItem check above.
+      // That's because places root are only exposed through folder shortcuts
+      // descendants of the left pane folder.
+      return false;
+    }
+
+    return true;
+  },
+
+  setCellText: function PTV_setCellText(aRow, aColumn, aText) {
+    // We may only get here if the cell is editable.
+    let node = this._rows[aRow];
+    if (node.title != aText) {
+      let txn = new PlacesEditItemTitleTransaction(node.itemId, aText);
+      PlacesUtils.transactionManager.doTransaction(txn);
+    }
+  },
+
+  toggleCutNode: function PTV_toggleCutNode(aNode, aValue) {
+    let currentVal = this._cuttingNodes.has(aNode);
+    if (currentVal != aValue) {
+      if (aValue)
+        this._cuttingNodes.add(aNode);
+      else
+        this._cuttingNodes.delete(aNode);
+
+      this._invalidateCellValue(aNode, this.COLUMN_TYPE_TITLE);
+    }
+  },
+
+  selectionChanged: function() { },
+  cycleCell: function(aRow, aColumn) { },
+  isSelectable: function(aRow, aColumn) { return false; },
+  performAction: function(aAction) { },
+  performActionOnRow: function(aAction, aRow) { },
+  performActionOnCell: function(aAction, aRow, aColumn) { }
+};