Drag and drop onto ListBox item

[Georg]

I would like to drag a ListBox item and drop it onto another item. In OnDragOver and OnDrop the sender is the ListBox, but I don't see a way to identify the specific item I am dragging over or dropping on. Is there a way to do that?

[Martin Ivanov]

Hello Georg,

To achieve your requirement you can create a custom ListBoxDragDropBehavior and override its CanDrop and Drop methods.

public class CustomDragDropBehavior : ListBoxDragDropBehavior
{
	public override bool CanDrop(DragDropState state)
	{
		var draggedItems = state.DraggedItems;
		var dropPosition = state.DropPosition;
		return base.CanDrop(state);
	}

	public override void Drop(DragDropState state)
	{
		base.Drop(state);
	}
}

If you use DragDropManage to create the drag/drop customization, you can get the dragged item via the OriginalSource property of the event arguments. For the drop target, you will need to implement some code that detects what is the element under the mouse

Can you please try those approaches and let me know if you need further assistance?

Regards,
Martin Ivanov
Progress Telerik

[Georg]

Thanks Martin - I'll give that a try. I had another idea too, which involved rearranging the UI so the drag was to a TreeView instead. I'll try this first though.