How do I know if a drag/drop has been cancelled in WPF

Posted by Jon Mitchell on Stack Overflow See other posts from Stack Overflow or by Jon Mitchell
Published on 2010-04-07T08:37:05Z Indexed on 2010/04/07 9:03 UTC
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drag-and-drop

I'm writing a user control in WPF which is based on a ListBox. One of the main pieces of functionality is the ability to reorder the list by dragging the items around. When a user drags an item I change the items Opacity to 50% and physically move the item in an ObservableCollection in my ViewModel depending on where the user wants it. On the drop event I change the Opacity back to 100%.

The problem I've got is that if the user drags the item off my control and drops it somewhere else then I need to change the Opacity back to 100% and move the item back to where it was when the user started the drag. Is there an event I can handle to capture this action? If not is there any other cunning way to solve this problem?

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