Added clearing features for the class canvas and diagram router.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@2401 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/DisplayBindings/ClassDiagram/ClassCanvas/Src/ClassCanvas.cs

@@ -489,6 +489,16 @@ namespace ClassDiagram
 			LayoutChanged(this, EventArgs.Empty);
 		}
 		
+		public void ClearCanvas()
+		{
+			itemsList.Clear();
+			classesToData.Clear();
+			itemsList.Clear();
+			dragItemNode = null;
+			hoverItemNode = null;
+			diagramRouter.Clear();
+		}
+		
 		/// <summary>
 		/// Retruns a copy of the the canvas items list as an array.
 		/// </summary>
@@ -592,6 +602,8 @@ namespace ClassDiagram
 		{
 			if (pc == null) return;
 			if (doc == null) return;
+			ClearCanvas();
+			
 			XPathNavigator nav = doc.CreateNavigator();
 			XPathNodeIterator ni = nav.Select(@"/ClassDiagram/Class | /ClassDiagram/Struct | /ClassDiagram/Enum | /ClassDiagram/Interface | /ClassDiagram/Delegate");
 			while (ni.MoveNext())

src/AddIns/DisplayBindings/ClassDiagram/DiagramRouter/DiagramRouter.cs

@@ -117,6 +117,17 @@ namespace Tools.Diagrams
 			routes.Remove(route);
 		}
 		
+		public void Clear()
+		{
+			routes.Clear();
+			rects.Clear();
+		}
+		
+		public void ClearRoutes()
+		{
+			routes.Clear();
+		}
+		
 		private DependencyTree<IRectangleSizeDecorator> BuildDependenciesTree ()
 		{
 			DependencyTree<IRectangleSizeDecorator> deps = new DependencyTree<IRectangleSizeDecorator>();