The diagram pane display is slow,how to make it fast?

[Jonathan]

Hi, like the OpenDiagramdemo.zip, i have a diagram, when startup, it add 500 shapes to this diagram. Then i click the "click me" in the left treeview to open a radpane, and the radpane show the diagram. The problem is that it takes too much time to opening the radpane. When opened, i move the view area in the thumbnail, its response is slow too. How to make fast?

Hope answers, thanks!

OpenDiagramdemo.zip download url:  http://www.filefactory.com/file/5cu3dseh6x8h/OpenDiagramdemo.zip

[Petar Mladenov]

Hi Jonathan,

Thumbnail is performing refresh for every shape. That is why we want to suggest RadDiagramNavigationPane. It wraps Thumbnail and can be collapsed until the diagram loads:

public RadDiagramNavigationPane diagramThumbnail = null;

     public MyDiagramUserControl(RadDiagram diagram, bool needsThumnail)
     {
         InitializeComponent();
         this.diagram = diagram;
         if (!this.diagramHostPanel.Children.Contains(diagram))
             this.diagramHostPanel.Children.Add(diagram);
         if (needsThumnail)
         {
             diagramThumbnail = new RadDiagramNavigationPane() { Diagram = diagram };
             diagramThumbnail.VerticalAlignment = VerticalAlignment.Bottom;
             diagramThumbnail.HorizontalAlignment = HorizontalAlignment.Left;
             diagramThumbnail.IsExpanded =false;
             this.diagramHostPanel.Children.Add(diagramThumbnail);
             diagram.Loaded += (s, e) =>
             {
                 diagramThumbnail.IsExpanded = true;
                 diagramThumbnail.RefreshThumbnail();
             };
         }
     }

Regards,
Petar Mladenov
Progress Telerik

[Jonathan]

Thank you, Peter. It's OK!