How to check if Drag was canceled

GoXam
1

Hi,
I drag my Nodes from a ListBox (I send you an example earlier). All works well, but I can’t check if someone presses the Escapekey during the drag operation. I tried to override DraggingTool.OnQueryContinueDrag, but this wasn’t called.

So how can I do something If the User presses the Escapekey to cancel the Drag’n’Drop?

2

You mean DraggingTool.DoQueryContinueDrag?

3

Yes, I set a Breakpoint but - no break.

4

You could override DraggingTool.DoDragLeave to clean up whenever the mouse leaves the diagram, including when it is canceled.

5

Ok, I’ll try this.
Thank you.

6

This is working!

    public override void DoDragLeave(DragEventArgs e)
    {
        if (e.Effects == DragDropEffects.None)
        {
            DoCleanup();
        }
        base.DoDragLeave(e);
    }