[interface] Preliminary drag-and-drop.

1) Items into collections.
  2) Collections into collections.
	Dan S, please check this out, I am getting some exceptions from the data access portion.
[interface] Temporarily, "metadata" pane on the right is not resizable.

chrome/chromeFiles/content/scholar/collectionTreeView.js

@@ -1,10 +1,21 @@
 Scholar.CollectionTreeView = function()
 {
 	this._treebox = null;
+	this._unregisterID = Scholar.Notifier.registerColumnTree(this);
+	this.refresh();
+}
+
+Scholar.CollectionTreeView.prototype.refresh = function()
+{
 	this._dataItems = new Array();
 	this.rowCount = 0;
 	this._showItem(new Scholar.ItemGroup('library',null),0,1);
-	this._unregisterID = Scholar.Notifier.registerColumnTree(this);
+	
+	var newRows = Scholar.getCollections();
+	for(var i = 0; i < newRows.length; i++)
+		this._showItem(new Scholar.ItemGroup('collection',newRows[i]),  0, this._dataItems.length); //item ref, level, beforeRow
+		
+	this._refreshHashMap();
 }
 
 /*
@@ -80,12 +91,6 @@ Scholar.CollectionTreeView.prototype.setTree = function(treebox)
 	if(this._treebox)
 		return;
 	this._treebox = treebox;
-	
-	var newRows = Scholar.getCollections();
-	for(var i = 0; i < newRows.length; i++)
-		this._showItem(new Scholar.ItemGroup('collection',newRows[i]),  0, this._dataItems.length); //item ref, level, beforeRow
-		
-	this._refreshHashMap();
 }
 
 Scholar.CollectionTreeView.prototype.getCellText = function(row, column)
@@ -243,17 +248,60 @@ Scholar.CollectionTreeView.prototype._refreshHashMap = function()
 
 Scholar.CollectionTreeView.prototype.canDrop = function(row, orient)
 {
-	if(orient == this.DROP_ON && this._getItemAtRow(row).isCollection())
+	if(orient == 0 && this._getItemAtRow(row).isCollection())
+	{
+		Scholar.debug("drag on row: " + row + "      orient: " + orient);
 		return true;
+	}
 	else
 		return false;
-		
 }
 
 Scholar.CollectionTreeView.prototype.drop = function(row, orient)
 {
-	//you can't really do anything here, look to overlay.js - ScholarCollectionsDragObserver
+	var dataSet = nsTransferable.get(this.getSupportedFlavours(),nsDragAndDrop.getDragData, true);
+	var data = dataSet.first.first;
+	var dataType = data.flavour.contentType;
+	var ids = data.data.split(',');
+	
+	if(dataType == 'scholar/collection')
+	{
+		var oldCount = this.rowCount;
+		
+		var targetCollectionID;
+		if(this.canDrop(row,orient))
+			targetCollectionID = this._getItemAtRow(row).ref.getID();
+			
+		var droppedCollection = Scholar.Collections.get(ids[0]);
+		droppedCollection.changeParent(targetCollectionID);
+		this.refresh();
+		this._treebox.rowCountChanged(0,this.rowCount-oldCount);
+		this._treebox.invalidate();
 	}
+	else if(dataType == 'scholar/item' && this.canDrop(row, orient))
+	{
+		var targetCollection = this._getItemAtRow(row).ref;
+		for(var i = 0; i<ids.length; i++)
+			targetCollection.addItem(ids[i]);
+	}
+}
+
+Scholar.CollectionTreeView.prototype.onDragStart = function(evt,transferData,action)
+{
+	transferData.data=new TransferData();
+	transferData.data.addDataForFlavour("scholar/collection",this._getItemAtRow(this.selection.currentIndex).ref.getID());
+}
+
+Scholar.CollectionTreeView.prototype.getSupportedFlavours = function () 
+{ 
+	var flavors = new FlavourSet();
+	flavors.appendFlavour("scholar/item");
+	flavors.appendFlavour("scholar/collection");
+	return flavors; 
+}
+
+Scholar.CollectionTreeView.prototype.onDragOver = function (evt,dropdata,session) { }
+Scholar.CollectionTreeView.prototype.onDrop = function (evt,dropdata,session) { }
 
 //
 // SCHOLAR ITEMGROUP

chrome/chromeFiles/content/scholar/itemTreeView.js

@@ -299,3 +299,20 @@ Scholar.ItemTreeView.prototype.canDrop = function(index, orient)
 {
 	return false;
 }
+
+Scholar.ItemTreeView.prototype.onDragStart = function (evt,transferData,action)
+{ 
+	transferData.data=new TransferData();
+	this.saveSelection();
+	transferData.data.addDataForFlavour("scholar/item",this._savedSelection);
+}
+	
+Scholar.ItemTreeView.prototype.getSupportedFlavours = function () 
+{ 
+	var flavors = new FlavourSet();
+	flavors.appendFlavour("scholar/item");
+	return flavors; 
+}
+
+Scholar.ItemTreeView.prototype.onDragOver = function (evt,dropdata,session) { }
+Scholar.ItemTreeView.prototype.onDrop = function (evt,dropdata,session) { }	

chrome/chromeFiles/content/scholar/overlay.js

@@ -19,6 +19,8 @@ var ScholarPane = new function()
 	this.deleteCollectionSelection = deleteCollectionSelection;
 	this.renameSelectedCollection = renameSelectedCollection;
 	this.search = search;
+	this.getCollectionsView = getCollectionsView;
+	this.getItemsView = getItemsView;
 	
 	/*
 	 * Called when the window is open
@@ -153,31 +155,15 @@ var ScholarPane = new function()
 		if(itemsView)
 			itemsView.searchText(document.getElementById('tb-search').value);
 	}
+	
+	function getCollectionsView()
+	{
+		return collectionsView;
 	}
 	
-var ScholarItemsDragObserver =
+	function getItemsView()
 	{
-	onDragStart: function (evt,transferData,action)
+		return itemsView;
-	{ 
-		transferData.data=new TransferData(); 
-		transferData.data.addDataForFlavour("text/unicode","random data"); 
-		
-	}	
-}; 
-
-var ScholarCollectionsDragObserver =
-{
-	getSupportedFlavours : function () 
-	{ 
-		var flavours = new FlavourSet(); 
-		flavours.appendFlavour("text/unicode"); 
-		
-		return flavours; 
-	}, 
-	onDragOver: function (evt,dropdata,session){}, 
-	onDrop: function (evt,dropdata,session)
-	{ 
-		alert(dropdata.data);
 	}
 }
 

chrome/chromeFiles/content/scholar/overlay.xul

@@ -28,7 +28,8 @@
 				</toolbar>
 				<tree id="collections-tree" hidecolumnpicker="true"
 					onselect="ScholarPane.onCollectionSelected();" seltype="single"
-					ondragover="nsDragAndDrop.dragOver(event,ScholarCollectionsDragObserver)" ondragdrop="nsDragAndDrop.drop(event,ScholarCollectionsDragObserver)"
+					ondragover="nsDragAndDrop.dragOver(event,ScholarPane.getCollectionsView())" ondragdrop="nsDragAndDrop.drop(event,ScholarPane.getCollectionsView())"
+					ondraggesture="if (event.target.localName == 'treechildren') nsDragAndDrop.startDrag(event,ScholarPane.getCollectionsView());"
 					onkeypress="if(event.keyCode == event.DOM_VK_BACK_SPACE || event.keyCode == event.DOM_VK_DELETE){ ScholarPane.deleteCollectionSelection(); return false; }"
 					flex="1">
 					<treecols>
@@ -57,7 +58,8 @@
 					id="items-tree" 
 					enableColumnDrag="true" onkeypress="if(event.keyCode == event.DOM_VK_BACK_SPACE || event.keyCode == event.DOM_VK_DELETE){ ScholarPane.deleteItemSelection(); return false; }"
 					onselect="ScholarPane.itemSelected();"
-					ondraggesture="if (event.target.localName == 'treechildren') nsDragAndDrop.startDrag(event,ScholarItemsDragObserver);"
+					ondraggesture="if (event.target.localName == 'treechildren') nsDragAndDrop.startDrag(event,ScholarPane.getItemsView());"
+					ondragover="nsDragAndDrop.dragOver(event,ScholarPane.getItemsView())" ondragdrop="nsDragAndDrop.drop(event,ScholarPane.getItemsView())"
 					flex="1">
 					<treecols>
 						<treecol
@@ -95,8 +97,8 @@
 				</tree>
 			
 			</vbox>
-			<splitter id="scholar-view-splitter" resizebefore="closest" resizeafter="closest" hidden="true"/>
+			<separator orient="vertical" class="thin" id="scholar-view-splitter" hidden="true"/>
-			<tabbox id="scholar-view-item" hidden="true" flex="2" style="min-width: 300px;">
+			<tabbox id="scholar-view-item" hidden="true" flex="2" style="min-width: 300px; max-width: 300px;">
 				<tabs>
 					<tab label="Metadata"/>
 					<tab label="Notes"/>

chrome/chromeFiles/skin/default/scholar/overlay.css

@@ -14,7 +14,6 @@ tree #collections-tree
 #scholar-tree-splitter
 {
 	background: #f5f5f5;
-
 }
 
 tree #items-tree