Detect drop from toolbox

[Valentino]

What is the best way to react to a shape being drag-dropped onto the diagram from the toolbox? At the moment I'm subscribing to the ItemsChanged event but I'm sure there must be a better way? I'm also doing things with drag-drop (shapes within the diagram) but this doesn't seem to relate to the toolbox.

[Tino]

ok, I had seen DragDropService_PreviewDragDrop earlier but somehow forgot about it.

Anyway, I've implemented it but mu dropTarget.Shapes collection is always empty.. Why would that be.

I'll probably lodge a ticket now that I have been assigned a login.

[Dimitar]

Hello Valentino,

You can use the following code to get the diagram in the PreviewDragDrop event handler:

public RadForm1()
{
    InitializeComponent();

    radDiagramToolbox1.ListViewElement.DragDropService.PreviewDragDrop += DragDropService_PreviewDragDrop;
}
void DragDropService_PreviewDragDrop(object sender, Telerik.WinControls.RadDropEventArgs e)
{
    var diagramElement = e.HitTarget as RadDiagramElement;
    if (diagramElement != null)
    {
        Console.WriteLine(diagramElement.Items.Count);
    }
}

I hope this will be useful. Let me know if you have additional questions.

Regards,
Dimitar
Progress Telerik