List Box Drag and drop reordering - deletes dragged object if outside listbox

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Stuart Cotts
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Stuart Cotts asked on 03 May 2021, 05:52 AM
I am using using Drag and Drop to reorder in a List Box, using the example from the ListBox documentation if I drag outside of the List box the dragged item is deleted from the list box. Any way I can stop this from happening???

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Martin Ivanov
Telerik team
answered on 04 May 2021, 12:09 PM

Hello Stuart,

This is the default behavior of the  base DragDropBehavior class inherited by the ListBoxDragDropBehavior. If the drag/drop action finishes while the mouse is outside of the RadListBox control (over another element that allows drop), the dragged items are removed from the source collection.

To alter this behavior, you can create a custom class deriving from ListBoxDragDropBehavior and override its DragDropCompleted method. There you can implement custom code that executes on drop outside of RadListBox. For example:

public class CustomListBoxDragDropBehavior : ListBoxDragDropBehavior
{
	public override void DragDropCompleted(DragDropState state)
	{
		// do nothing, if you want to avoid removing the dragged items on drag outside of the listbox
		// else, execute custom logic that removes the items. You do this using the following line:
		// RemoveItems(state.SourceItemsSource, state.DraggedItems);
	}
}

Regards,
Martin Ivanov
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Stuart Cotts
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Martin Ivanov
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