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Normal Topic Disallow Drag and Drop Issue (Read 1069 times)
chris
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Disallow Drag and Drop Issue
Aug 20th, 2009 at 4:44pm
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Hi Stoyan,

I have two windows with different Diagram controls. The problem is that I can drag Node from one palette of Window A and drop to Diagram control of Window B.

Even if I add Drag_Over event handler and wirte code like this
e.Effects = System.Windows.DragDropEffects.None

the tester can drop nodes to it sometimes when he drags and drops in an "intentional quick" way.

Do you have some suggestion about how to prevent dragging and dropping to Diagram form outside?

Thanks a lot!
  
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Stoyo
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Re: Disallow Drag and Drop Issue
Reply #1 - Aug 21st, 2009 at 11:58am
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Hi,

You can stop the drop event from reaching the diagram by setting Handled - true in the preview event:

Code
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private void diagram_OnPreviewDrop(object sender, DragEventArgs e)
{
	e.Handled = true;
}


DragEventArgs doesn't show where the drag operation started, so you must devise another way to determine that. E.g. you could handle PreviewMouseDown of the NodeListViews and keep tracks which is the last one the user clicked, or perhaps examine the DiagramNode set as e.Data and check if it's from an allowed type.

I hope that helps,
Stoyan
  
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