zotero/chrome/content/zotero/xpcom/collectionTreeView.js

/*
    ***** BEGIN LICENSE BLOCK *****
    
    Copyright (c) 2006  Center for History and New Media
                        George Mason University, Fairfax, Virginia, USA
                        http://chnm.gmu.edu
    
    Licensed under the Educational Community License, Version 1.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at
    
    http://www.opensource.org/licenses/ecl1.php
    
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
    
    ***** END LICENSE BLOCK *****
*/

////////////////////////////////////////////////////////////////////////////////
///
///  CollectionTreeView
///    -- handles the link between an individual tree and the data layer
///    -- displays only collections, in a hierarchy (no items)
///
////////////////////////////////////////////////////////////////////////////////

/*
 *  Constructor the the CollectionTreeView object
 */
Zotero.CollectionTreeView = function()
{
	this._treebox = null;
	this.itemToSelect = null;
	this._highlightedRows = {};
	this._unregisterID = Zotero.Notifier.registerObserver(this, ['collection', 'search', 'share']);
	this.showDuplicates = false;
}

/*
 *  Called by the tree itself
 */
Zotero.CollectionTreeView.prototype.setTree = function(treebox)
{
	if (this._treebox || !treebox) {
		return;
	}
	this._treebox = treebox;
	
	// Add a keypress listener for expand/collapse
	var expandAllRows = this.expandAllRows;
	var collapseAllRows = this.collapseAllRows;
	var tree = this._treebox.treeBody.parentNode;
	tree.addEventListener('keypress', function(event) {
		var key = String.fromCharCode(event.which);
		
		if (key == '+' && !(event.ctrlKey || event.altKey || event.metaKey)) {
			expandAllRows(treebox);
			return;
		}
		else if (key == '-' && !(event.shiftKey || event.ctrlKey ||
				event.altKey || event.metaKey)) {
			collapseAllRows(treebox);
			return;
		}
	}, false);
	
	this.refresh();
	
	// Select the last-viewed collection
	var lastViewedFolder = Zotero.Prefs.get('lastViewedFolder');
	var matches = lastViewedFolder.match(/^(?:(C|S)([0-9]+)|L)$/);
	var select = 0;
	if (matches) {
		if (matches[1] == 'C') {
			if (this._collectionRowMap[matches[2]]) {
				select = this._collectionRowMap[matches[2]];
			}
			// Search recursively
			else {
				var path = [];
				var failsafe = 10; // Only go up ten levels
				var lastCol = matches[2];
				do {
					failsafe--;
					var col = Zotero.Collections.get(lastCol);
					if (!col) {
						var msg = "Last-viewed collection not found";
						Zotero.debug(msg);
						path = [];
						break;
					}
					var par = col.getParent();
					if (!par) {
						var msg = "Parent collection not found in "
							+ "Zotero.CollectionTreeView.setTree()";
						Zotero.debug(msg, 1);
						Components.utils.reportError(msg);
						path = [];
						break;
					}
					lastCol = par;
					path.push(lastCol);
				}
				while (!this._collectionRowMap[lastCol] && failsafe > 0)
				if (path.length) {
					for (var i=path.length-1; i>=0; i--) {
						var id = path[i];
						var row = this._collectionRowMap[id];
						if (!row) {
							var msg = "Collection not found in tree in "
								+ "Zotero.CollectionTreeView.setTree()";
							Zotero.debug(msg, 1);
							Components.utils.reportError(msg);
							break;
						}
						if (!this.isContainerOpen(row)) {
							this.toggleOpenState(row);
							if (this._collectionRowMap[matches[2]]) {
								select = this._collectionRowMap[matches[2]];
								break;
							}
						}
					}
				}
			}
		}
		else if (matches[1] == 'S' && this._searchRowMap[matches[2]]) {
			select = this._searchRowMap[matches[2]];
		}
	}
	this.selection.select(select);
}

/*
 *  Reload the rows from the data access methods
 *  (doesn't call the tree.invalidate methods, etc.)
 */
Zotero.CollectionTreeView.prototype.refresh = function()
{
	this.selection.clearSelection();
	var oldCount = this.rowCount;
	this._dataItems = [];
	this.rowCount = 0;
	this._showItem(new Zotero.ItemGroup('library',null),0,1);
	
	var newRows = Zotero.getCollections();
	for(var i = 0; i < newRows.length; i++)
		this._showItem(new Zotero.ItemGroup('collection',newRows[i]),  0, this._dataItems.length); //itemgroup ref, level, beforeRow
	
	var savedSearches = Zotero.Searches.getAll();
	if (savedSearches) {
		for (var i=0; i<savedSearches.length; i++) {
			this._showItem(new Zotero.ItemGroup('search',savedSearches[i]),  0, this._dataItems.length); //itemgroup ref, level, beforeRow
		}
	}
	
	var shares = Zotero.Zeroconf.instances;
	if (shares) {
		for each(var share in shares) {
			this._showItem(new Zotero.ItemGroup('share', share), 0, this._dataItems.length); //itemgroup ref, level, beforeRow
		}
	}
	
	var deletedItems = Zotero.Items.getDeleted();
	if (deletedItems || Zotero.Prefs.get("showTrashWhenEmpty")) {
		this._showItem(new Zotero.ItemGroup('trash', null), 0, this._dataItems.length);
	}
	this.trashNotEmpty = !!deletedItems;
	
	this._refreshHashMap();
	
	// Update the treebox's row count
	var diff = this.rowCount - oldCount;
	if (diff != 0) {
		this._treebox.rowCountChanged(0, diff);
	}
}

/*
 *  Redisplay everything
 */
Zotero.CollectionTreeView.prototype.reload = function()
{
	var openCollections = [];
	
	for (var i=0; i<this.rowCount; i++) {
		if (this.isContainer(i) && this.isContainerOpen(i)) {
			openCollections.push(this._getItemAtRow(i).ref.id);
		}
	}
	
	this._treebox.beginUpdateBatch();
	this.refresh();
	
	for(var i = 0; i < openCollections.length; i++)
	{
		var row = this._collectionRowMap[openCollections[i]];
		if (row != null) {
			this.toggleOpenState(row);
		}
	}
	this._treebox.invalidate();
	this._treebox.endUpdateBatch();
}

/*
 *  Called by Zotero.Notifier on any changes to collections in the data layer
 */
Zotero.CollectionTreeView.prototype.notify = function(action, type, ids)
{
	if (!ids || ids.length == 0) {
		return;
	}
	
	if (!this._collectionRowMap) {
		Zotero.debug("Collection row map didn't exist in collectionTreeView.notify()");
		return;
	}
	
	this.selection.selectEventsSuppressed = true;
	var savedSelection = this.saveSelection();
	
	var madeChanges = false;
	
	if (action == 'delete') {
		//Since a delete involves shifting of rows, we have to do it in order
		
		//sort the ids by row
		var rows = new Array();
		for (var i in ids)
		{
			switch (type)
			{
				case 'collection':
					if(this._collectionRowMap[ids[i]] != null)
					{
						rows.push(this._collectionRowMap[ids[i]]);
					}
					break;
				
				case 'search':
					if(this._searchRowMap[ids[i]] != null)
					{
						rows.push(this._searchRowMap[ids[i]]);
					}
					break;
			}
		}
		
		if(rows.length > 0)
		{
			rows.sort(function(a,b) { return a-b });
			
			for(var i=0, len=rows.length; i<len; i++)
			{
				var row = rows[i];
				this._hideItem(row-i);
				this._treebox.rowCountChanged(row-i,-1);
			}
			
			this._refreshHashMap();
		}
	}
	else if(action == 'move')
	{
		for (var i=0; i<ids.length; i++) {
			// Open the parent collection if closed
			var collection = Zotero.Collections.get(ids[i]);
			var parentID = collection.parent;
			if (parentID && this._collectionRowMap[parentID] &&
					!this.isContainerOpen(this._collectionRowMap[parentID])) {
				this.toggleOpenState(this._collectionRowMap[parentID]);
			}
		}
		
		this.reload();
		this.rememberSelection(savedSelection);
	}
	else if (action == 'modify' || action == 'refresh') {
		this.reload();
		this.rememberSelection(savedSelection);
	}
	else if(action == 'add')
	{
		// Multiple adds not currently supported
		ids = ids[0];
		
		switch (type)
		{
			case 'collection':
				var collection = Zotero.Collections.get(ids);
				var collectionID = collection.id;
				// Open container if creating subcollection
				var parentID = collection.getParent();
				if (parentID) {
					if (!this.isContainerOpen(this._collectionRowMap[parentID])){
						this.toggleOpenState(this._collectionRowMap[parentID]);
					}
				}
				
				this.reload();
				this.selection.select(this._collectionRowMap[collectionID]);
				break;
				
			case 'search':
				this.reload();
				this.selection.select(this._searchRowMap[ids]);
				break;
		}
	}
	
	this.selection.selectEventsSuppressed = false;
}


/*
 * Set the rows that should be highlighted -- actually highlighting is done
 * by getRowProperties based on the array set here
 */
Zotero.CollectionTreeView.prototype.setHighlightedRows = function (ids) {
	this._highlightedRows = {};
	this._treebox.invalidate();
	
	for each(var id in ids) {
		this.expandToCollection(id);
		this._highlightedRows[this._collectionRowMap[id]] = true;
		this._treebox.invalidateRow(this._collectionRowMap[id]);
	}
}


/*
 *  Unregisters view from Zotero.Notifier (called on window close)
 */
Zotero.CollectionTreeView.prototype.unregister = function()
{
	Zotero.Notifier.unregisterObserver(this._unregisterID);
}

Zotero.CollectionTreeView.prototype.isLibrary = function(row)
{
	return this._getItemAtRow(row).isLibrary();
}

Zotero.CollectionTreeView.prototype.isCollection = function(row)
{
	return this._getItemAtRow(row).isCollection();
}

Zotero.CollectionTreeView.prototype.isSearch = function(row)
{
	return this._getItemAtRow(row).isSearch();
}


////////////////////////////////////////////////////////////////////////////////
///
///  nsITreeView functions
///  http://www.xulplanet.com/references/xpcomref/ifaces/nsITreeView.html
///
////////////////////////////////////////////////////////////////////////////////

Zotero.CollectionTreeView.prototype.getCellText = function(row, column)
{
	var obj = this._getItemAtRow(row);
	
	if(column.id == "zotero-collections-name-column")
		return obj.getName();
	else
		return "";
}

Zotero.CollectionTreeView.prototype.getImageSrc = function(row, col)
{
	var collectionType = this._getItemAtRow(row).type;
	if (collectionType == 'trash' && this.trashNotEmpty) {
		collectionType += "-full";
	}
	return "chrome://zotero/skin/treesource-" + collectionType + ".png";
}

Zotero.CollectionTreeView.prototype.isContainer = function(row)
{
	return this._getItemAtRow(row).isCollection();
}

Zotero.CollectionTreeView.prototype.isContainerOpen = function(row)
{
	return this._dataItems[row][1];
}

/*
 * Returns true if the collection has no child collections
 */
Zotero.CollectionTreeView.prototype.isContainerEmpty = function(row)
{
	var itemGroup = this._getItemAtRow(row);
	if (itemGroup.isCollection()) {
		return !itemGroup.ref.hasChildCollections();
	}
	return true;
}

Zotero.CollectionTreeView.prototype.getLevel = function(row)
{
	return this._dataItems[row][2];
}

Zotero.CollectionTreeView.prototype.getParentIndex = function(row)
{
	var thisLevel = this.getLevel(row);
	if(thisLevel == 0) return -1;
	for(var i = row - 1; i >= 0; i--)
		if(this.getLevel(i) < thisLevel)
			return i;
	return -1;
}

Zotero.CollectionTreeView.prototype.hasNextSibling = function(row, afterIndex)
{
	var thisLevel = this.getLevel(row);
	for(var i = afterIndex + 1; i < this.rowCount; i++)
	{	
		var nextLevel = this.getLevel(i);
		if(nextLevel == thisLevel) return true;
		else if(nextLevel < thisLevel) return false;
	}
}

/*
 *  Opens/closes the specified row
 */
Zotero.CollectionTreeView.prototype.toggleOpenState = function(row)
{
	var count = 0;		//used to tell the tree how many rows were added/removed
	var thisLevel = this.getLevel(row);

	this._treebox.beginUpdateBatch();
	if(this.isContainerOpen(row))
	{
		while((row + 1 < this._dataItems.length) && (this.getLevel(row + 1) > thisLevel))
		{
			this._hideItem(row+1);
			count--;	//count is negative when closing a container because we are removing rows
		}
	}
	else
	{
		var newRows = Zotero.getCollections(this._getItemAtRow(row).ref.id); //Get children
		
		for(var i = 0; i < newRows.length; i++)
		{
			count++;
			this._showItem(new Zotero.ItemGroup('collection',newRows[i]), thisLevel+1, row+i+1); //insert new row
		}
	}
	this._dataItems[row][1] = !this._dataItems[row][1];  //toggle container open value

	this._treebox.rowCountChanged(row+1, count); //tell treebox to repaint these
	this._treebox.invalidateRow(row);
	this._treebox.endUpdateBatch();	
	this._refreshHashMap();
}


Zotero.CollectionTreeView.prototype.expandAllRows = function(treebox) {
	var view = treebox.view;
	treebox.beginUpdateBatch();
	for (var i=0; i<view.rowCount; i++) {
		if (view.isContainer(i) && !view.isContainerOpen(i)) {
			view.toggleOpenState(i);
		}
	}
	treebox.endUpdateBatch();
}


Zotero.CollectionTreeView.prototype.expandToCollection = function(collectionID) {
	var col = Zotero.Collections.get(collectionID);
	if (!col) {
		Zotero.debug("Cannot expand to nonexistent collection " + collectionID, 2);
		return false;
	}
	var row = this._collectionRowMap[collectionID];
	if (row) {
		return true;
	}
	var path = [];
	var parent;
	while (parent = col.getParent()) {
		path.unshift(parent);
		col = Zotero.Collections.get(parent);
	}
	for each(var id in path) {
		row = this._collectionRowMap[id];
		if (!this.isContainerOpen(row)) {
			this.toggleOpenState(row);
		}
	}
	return true;
}


Zotero.CollectionTreeView.prototype.collapseAllRows = function(treebox) {
	var view = treebox.view;
	treebox.beginUpdateBatch();
	for (var i=0; i<view.rowCount; i++) {
		if (view.isContainer(i) && view.isContainerOpen(i)) {
			view.toggleOpenState(i);
		}
	}
	treebox.endUpdateBatch();
}


////////////////////////////////////////////////////////////////////////////////
///
///  Additional functions for managing data in the tree
///
////////////////////////////////////////////////////////////////////////////////

/*
 *  Delete the selection
 */
Zotero.CollectionTreeView.prototype.deleteSelection = function()
{
	if(this.selection.count == 0)
		return;

	//collapse open collections
	for(var i=0; i<this.rowCount; i++)
		if(this.selection.isSelected(i) && this.isContainer(i) && this.isContainerOpen(i))
			this.toggleOpenState(i);
	this._refreshHashMap();
	
	//create an array of collections
	var rows = new Array();
	var start = new Object();
	var end = new Object();
	for (var i=0, len=this.selection.getRangeCount(); i<len; i++)
	{
		this.selection.getRangeAt(i,start,end);
		for (var j=start.value; j<=end.value; j++)
			if(!this._getItemAtRow(j).isLibrary())
				rows.push(j);
	}
	
	//iterate and erase...
	this._treebox.beginUpdateBatch();
	for (var i=0; i<rows.length; i++)
	{
		//erase collection from DB:
		var group = this._getItemAtRow(rows[i]-i);
		if(group.isCollection())
		{
			group.ref.erase();
		}
		else if(group.isSearch())
		{
			Zotero.Searches.erase(group.ref['id']);
		}
	}
	this._treebox.endUpdateBatch();
	
	if(end.value < this.rowCount)
		this.selection.select(end.value);
	else
		this.selection.select(this.rowCount-1);
}

/*
 *  Called by various view functions to show a row
 * 
 *  	itemGroup:	reference to the ItemGroup
 *  	level:	the indent level of the row
 *      beforeRow:	row index to insert new row before
 */
Zotero.CollectionTreeView.prototype._showItem = function(itemGroup, level, beforeRow)
{
	this._dataItems.splice(beforeRow, 0, [itemGroup, false, level]);
	this.rowCount++;
}

/*
 *  Called by view to hide specified row
 */
Zotero.CollectionTreeView.prototype._hideItem = function(row)
{
	this._dataItems.splice(row,1); this.rowCount--;
}

/*
 *  Returns a reference to the collection at row (see Zotero.Collection in data_access.js)
 */
Zotero.CollectionTreeView.prototype._getItemAtRow = function(row)
{
	return this._dataItems[row][0];
}


/*
 *  Saves the ids of the currently selected item for later
 */
Zotero.CollectionTreeView.prototype.saveSelection = function()
{
	for (var i=0, len=this.rowCount; i<len; i++) {
		if (this.selection.isSelected(i)) {
			if (this._getItemAtRow(i).isLibrary()) {
				return 'L';
			}
			else if (this._getItemAtRow(i).isCollection()) {
				return 'C' + this._getItemAtRow(i).ref.id;
			}
			else if (this._getItemAtRow(i).isSearch()) {
				return 'S' + this._getItemAtRow(i).ref.id;
			}
			else if (this._getItemAtRow(i).isTrash()) {
				return 'T';
			}
		}
	}
	return false;
}

/*
 *  Sets the selection based on saved selection ids (see above)
 */
Zotero.CollectionTreeView.prototype.rememberSelection = function(selection)
{
	if (!selection) {
		return;
	}
	
	var id = selection.substr(1);
	switch (selection.substr(0, 1)) {
		// Library
		case 'L':
			this.selection.select(0);
			break;
		
		// Collection
		case 'C':
			// This only selects the collection if it's still visible,
			// so we open the parent in notify()
			if (this._collectionRowMap[id] != undefined) {
				this.selection.select(this._collectionRowMap[id]);
			}
			break;
		
		// Saved search
		case 'S':
			if (this._searchRowMap[id] != undefined) {
				this.selection.select(this._searchRowMap[id]);
			}
			break;
		
		case 'T':
			if (this._getItemAtRow(this.rowCount-1).isTrash()){
				this.selection.select(this.rowCount-1);
			}
			else {
				this.selection.select(0);
			}
			break;
	}
}



/*
 * Creates hash map of collection and search ids to row indexes
 * e.g., var rowForID = this._collectionRowMap[]
 */
Zotero.CollectionTreeView.prototype._refreshHashMap = function()
{	
	this._collectionRowMap = [];
	this._searchRowMap = [];
	for(var i=0; i < this.rowCount; i++){
		if (this.isCollection(i)){
			this._collectionRowMap[this._getItemAtRow(i).ref.id] = i;
		}
		else if (this.isSearch(i)){
			this._searchRowMap[this._getItemAtRow(i).ref.id] = i;
		}
	}
}

////////////////////////////////////////////////////////////////////////////////
///
///  Command Controller:
///		for Select All, etc.
///
////////////////////////////////////////////////////////////////////////////////

Zotero.CollectionTreeCommandController = function(tree)
{
	this.tree = tree;
}

Zotero.CollectionTreeCommandController.prototype.supportsCommand = function(cmd)
{
}

Zotero.CollectionTreeCommandController.prototype.isCommandEnabled = function(cmd)
{
}

Zotero.CollectionTreeCommandController.prototype.doCommand = function(cmd)
{
}

Zotero.CollectionTreeCommandController.prototype.onEvent = function(evt)
{
}

////////////////////////////////////////////////////////////////////////////////
///
///  Drag-and-drop functions:
///		canDrop() and drop() are for nsITreeView
///		onDragStart(), getSupportedFlavours(), and onDrop() for nsDragAndDrop.js
///
////////////////////////////////////////////////////////////////////////////////


/**
 * Start a drag using nsDragAndDrop.js or HTML 5 Drag and Drop
 */
Zotero.CollectionTreeView.prototype.onDragStart = function(event, transferData, action) {
	var collectionID = this._getItemAtRow(this.selection.currentIndex).ref.id;
	
	// Use nsDragAndDrop.js interface for Firefox 2 and Firefox 3.0
	var oldMethod = Zotero.isFx2 || Zotero.isFx30;
	
	if (oldMethod) {
		transferData.data = new TransferData();
		transferData.data.addDataForFlavour("zotero/collection", collectionID);
	}
	else {
		event.dataTransfer.setData("zotero/collection", collectionID);
	}
}


/**
 * Returns the supported drag flavors
 *
 * Called by nsDragAndDrop.js
 */
Zotero.CollectionTreeView.prototype.getSupportedFlavours = function () {
	var flavors = new FlavourSet();
	flavors.appendFlavour("zotero/collection");
	flavors.appendFlavour("zotero/item");
	flavors.appendFlavour("zotero/item-xml");
	flavors.appendFlavour("text/x-moz-url");
	flavors.appendFlavour("application/x-moz-file", "nsIFile");
	return flavors; 
}


/*
 *  Called while a drag is over the tree.
 */
Zotero.CollectionTreeView.prototype.canDrop = function(row, orient, dragData)
{
	//Zotero.debug("Row is " + row + "; orient is " + orient);
	
	// Two different services call canDrop, nsDragAndDrop and the tree
	// This is for the former, used when dragging between windows
	if (typeof row == 'object') {
		return false;
	}
	
	if (!dragData) {
		var dragData = Zotero.DragDrop.getDragData(this);
	}
	if (!dragData) {
		return false;
	}
	var dataType = dragData.dataType;
	var data = dragData.data;
	
	// For dropping collections onto root level
	if (orient == 1 && row == 0 && dataType == 'zotero/collection') {
		return true;
	}
	else if(orient == 0)	//directly on a row...
	{
		var rowCollection = this._getItemAtRow(row).ref; //the collection we are dragging over
		
		if (dataType == 'zotero/item') {
			var ids = data;
			for each(var id in ids)
			{
				var item = Zotero.Items.get(id);
				// Can only drag top-level items into collections
				if (item.isRegularItem() || !item.getSource())
				{
					// Make sure there's at least one item that's not already
					// in this collection
					if (!rowCollection.hasItem(id))
					{
						return true;
					}
				}
			}
			return false;
		}
		else if (dataType == 'zotero/item-xml') {
			var xml = new XML(data.data);
			for each(var xmlNode in xml.items.item) {
				var item = Zotero.Sync.Server.Data.xmlToItem(xmlNode);
				if (item.isRegularItem() || !item.getSource()) {
					return true;
				}
			}
			return false;
		}
		else if (dataType == 'text/x-moz-url'
				|| dataType == 'application/x-moz-file') {
			if (this._getItemAtRow(row).isSearch()) {
				return false;
			}
			// Don't allow folder drag
			if (dataType == 'application/x-moz-file' && data[0].isDirectory()) {
				return false;
			}
			return true;
		}
		else if (dataType == 'zotero/collection'
				// Collections cannot be dropped on themselves, nor in their children
				&& data[0] != rowCollection.id
				&& !Zotero.Collections.get(data[0]).hasDescendent('collection', rowCollection.id)) {
			return true;
		}
	}
	return false;
}

/*
 *  Called when something's been dropped on or next to a row
 */
Zotero.CollectionTreeView.prototype.drop = function(row, orient)
{
	var dragData = Zotero.DragDrop.getDragData(this);
	
	if (!this.canDrop(row, orient, dragData)) {
		return false;
	}
	
	var dataType = dragData.dataType;
	var data = dragData.data;
	
	if(dataType == 'zotero/collection')
	{
		var targetCollectionID;
		if(this._getItemAtRow(row).isCollection())
			targetCollectionID = this._getItemAtRow(row).ref.id;
		var droppedCollection = Zotero.Collections.get(data[0]);
		droppedCollection.parent = targetCollectionID;
		droppedCollection.save();
	}
	else if (dataType == 'zotero/item') {
		var ids = data;
		if (ids.length < 1) {
			return;
		}
		
		var toAdd = [];
		for (var i=0; i<ids.length; i++) {
			var item = Zotero.Items.get(ids[i]);
			// Only accept top-level items
			if (item.isRegularItem() || !item.getSource()) {
				toAdd.push(ids[i]);
			}
		}
		
		if (toAdd.length > 0) {
			this._getItemAtRow(row).ref.addItems(toAdd);
		}
	}
	else if (dataType == 'zotero/item-xml') {
		Zotero.DB.beginTransaction();
		var xml = new XML(data.data);
		var toAdd = [];
		for each(var xmlNode in xml.items.item) {
			var item = Zotero.Sync.Server.Data.xmlToItem(xmlNode, false, true);
			if (item.isRegularItem() || !item.getSource()) {
				var id = item.save();
				toAdd.push(id);
			}
		}
		if (toAdd.length > 0) {
			this._getItemAtRow(row).ref.addItems(toAdd);
		}
		
		Zotero.DB.commitTransaction();
		return;
	}
	else if (dataType == 'text/x-moz-url' || dataType == 'application/x-moz-file') {
		if (this._getItemAtRow(row).isCollection()) {
			var parentCollectionID = this._getItemAtRow(row).ref.id;
		}
		else {
			var parentCollectionID = false;
		}
		
		var unlock = Zotero.Notifier.begin(true);
		try {
			for (var i=0; i<data.length; i++) {
				var file = data[i];
				
				if (dataType == 'text/x-moz-url') {
					var url = data[i];
					
					if (url.indexOf('file:///') == 0) {
						var wm = Components.classes["@mozilla.org/appshell/window-mediator;1"]
								   .getService(Components.interfaces.nsIWindowMediator);
						var win = wm.getMostRecentWindow("navigator:browser");
						// If dragging currently loaded page, only convert to
						// file if not an HTML document
						if (win.content.location.href != url ||
								win.content.document.contentType != 'text/html') {
							var nsIFPH = Components.classes["@mozilla.org/network/protocol;1?name=file"]
									.getService(Components.interfaces.nsIFileProtocolHandler);
							try {
								var file = nsIFPH.getFileFromURLSpec(url);
							}
							catch (e) {
								Zotero.debug(e);
							}
						}
					}
					
					// Still string, so remote URL
					if (typeof file == 'string') {
						Zotero.Attachments.importFromURL(url, false, false, false, parentCollectionID);
						continue;
					}
					
					// Otherwise file, so fall through
				}
				
				try {
					Zotero.DB.beginTransaction();
					var itemID = Zotero.Attachments.importFromFile(file, false);
					if (parentCollectionID) {
						var col = Zotero.Collections.get(parentCollectionID);
						if (col) {
							col.addItem(itemID);
						}
					}
					Zotero.DB.commitTransaction();
				}
				catch (e) {
					Zotero.DB.rollbackTransaction();
					throw (e);
				}
			}
		}
		finally {
			Zotero.Notifier.commit(unlock);
		}
	}
}


/*
 * Called by HTML 5 Drag and Drop when dragging over the tree
 */
Zotero.CollectionTreeView.prototype.onDragEnter = function (event) {
	Zotero.debug("Storing current drag data");
	Zotero.DragDrop.currentDataTransfer = event.dataTransfer;
}


/*
 * Called by nsDragAndDrop.js and HTML 5 Drag and Drop when dragging over the tree
 */
Zotero.CollectionTreeView.prototype.onDragOver = function (event, dropdata, session) {
	return false;
}


/*
 * Called by nsDragAndDrop.js and HTML 5 Drag and Drop when dropping onto the tree
 */
Zotero.CollectionTreeView.prototype.onDrop = function (event, dropdata, session) {
	return false;
}

Zotero.CollectionTreeView.prototype.onDragExit = function (event) {
	Zotero.debug("Clearing drag data");
	Zotero.DragDrop.currentDataTransfer = null;
}




////////////////////////////////////////////////////////////////////////////////
///
///  Functions for nsITreeView that we have to stub out.
///
////////////////////////////////////////////////////////////////////////////////

Zotero.CollectionTreeView.prototype.isSorted = function() 							{ return false; }
Zotero.CollectionTreeView.prototype.isSeparator = function(row) 					{ return false; }
Zotero.CollectionTreeView.prototype.isEditable = function(row, idx) 				{ return false; }

/* Set 'highlighted' property on rows set by setHighlightedRows */
Zotero.CollectionTreeView.prototype.getRowProperties = function(row, props) {
	if (this._highlightedRows[row]) {
		var aServ = Components.classes["@mozilla.org/atom-service;1"].
			getService(Components.interfaces.nsIAtomService);
		props.AppendElement(aServ.getAtom("highlighted"));
	}
}

Zotero.CollectionTreeView.prototype.getColumnProperties = function(col, prop) 		{ }
Zotero.CollectionTreeView.prototype.getCellProperties = function(row, col, prop) 	{ }
Zotero.CollectionTreeView.prototype.performAction = function(action) 				{ }
Zotero.CollectionTreeView.prototype.performActionOnCell = function(action, row, col)	{ }
Zotero.CollectionTreeView.prototype.getProgressMode = function(row, col) 			{ }
Zotero.CollectionTreeView.prototype.cycleHeader = function(column)					{ }

////////////////////////////////////////////////////////////////////////////////
///
///  Zotero ItemGroup -- a sort of "super class" for collection, library,
///  	and saved search
///
////////////////////////////////////////////////////////////////////////////////

Zotero.ItemGroup = function(type, ref)
{
	this.type = type;
	this.ref = ref;
}

Zotero.ItemGroup.prototype.isLibrary = function()
{
	return this.type == 'library';
}

Zotero.ItemGroup.prototype.isCollection = function()
{
	return this.type == 'collection';
}

Zotero.ItemGroup.prototype.isSearch = function()
{
	return this.type == 'search';
}

Zotero.ItemGroup.prototype.isShare = function()
{
	return this.type == 'share';
}

Zotero.ItemGroup.prototype.isTrash = function()
{
	return this.type == 'trash';
}


Zotero.ItemGroup.prototype.getName = function()
{
	if (this.isCollection()) {
		return this.ref.name;
	}
	else if (this.isLibrary()) {
		return Zotero.getString('pane.collections.library');
	}
	else if (this.isSearch()) {
		return this.ref.name;
	}
	else if (this.isShare()) {
		return this.ref.name;
	}
	else if (this.isTrash()) {
		return Zotero.getString('pane.collections.trash');
	}
	else {
		return "";
	}
}

Zotero.ItemGroup.prototype.getChildItems = function()
{
	// Fake results if this is a shared library
	if (this.isShare()) {
		return this.ref.getAll();
	}
	
	var s = this.getSearchObject();
	try {
		var ids;
		if (this.showDuplicates) {
			var duplicates = new Zotero.Duplicate;
			var tmpTable = s.search(true);
			ids = duplicates.getIDs(tmpTable);
			Zotero.DB.query("DROP TABLE " + tmpTable);
		}
		else {
			ids = s.search();
		}
	}
	catch (e) {
		Zotero.DB.rollbackAllTransactions();
		Zotero.debug(e, 2);
		throw (e);
	}
	return Zotero.Items.get(ids);
}


/*
 * Returns the search object for the currently display
 *
 * This accounts for the collection, saved search, quicksearch, tags, etc.
 */
Zotero.ItemGroup.prototype.getSearchObject = function() {
	var includeScopeChildren = false;
	
	// Create/load the inner search
	var s = new Zotero.Search(this.isSearch() ? this.ref.id : null);
	if (this.isLibrary()) {
		s.addCondition('noChildren', 'true');
		includeScopeChildren = true;
	}
	else if (this.isCollection()) {
		s.addCondition('noChildren', 'true');
		s.addCondition('collectionID', 'is', this.ref.id);
		if (Zotero.Prefs.get('recursiveCollections')) {
			s.addCondition('recursive', 'true');
		}
		includeScopeChildren = true;
	}
	else if (this.isTrash()) {
		s.addCondition('deleted', 'true');
	}
	else if (!this.isSearch()) {
		throw ('Invalid search mode in Zotero.ItemGroup.getSearchObject()');
	}
	
	// Create the outer (filter) search
	var s2 = new Zotero.Search();
	if (this.isTrash()) {
		s2.addCondition('deleted', 'true');
	}
	s2.setScope(s, includeScopeChildren);
	
	if (this.searchText) {
		s2.addCondition('quicksearch', 'contains', this.searchText);
	}
	
	if (this.tags){
		for (var tag in this.tags){
			if (this.tags[tag]){
				s2.addCondition('tag', 'is', tag);
			}
		}
	}
	
	return s2;
}


/*
 * Returns all the tags used by items in the current view
 */
Zotero.ItemGroup.prototype.getChildTags = function() {
	// TODO: implement?
	if (this.isShare()) {
		return false;
	}
	
	var s = this.getSearchObject();
	return Zotero.Tags.getAllWithinSearch(s);
}


Zotero.ItemGroup.prototype.setSearch = function(searchText)
{
	this.searchText = searchText;
}

Zotero.ItemGroup.prototype.setTags = function(tags)
{
	this.tags = tags;
}

/*
 * Returns TRUE if saved search, quicksearch or tag filter
 */
Zotero.ItemGroup.prototype.isSearchMode = function() {
	if (this.isSearch() || this.isTrash()) {
		return true;
	}
	
	// Quicksearch
	if (this.searchText != '') {
		return true;
	}
	
	// Tag filter
	if (this.tags) {
		for (var i in this.tags) {
			return true;
		}
	}
}