private void SetCurrentDropTarget(IDropTarget value, RelativePoint mousePosition, bool raiseDragEvents)
{
if (value == m_currentDropTarget)
{
return;
}
var element = this.DraggedElement;
if (m_currentDropTarget != null)
{
if (raiseDragEvents)
{
m_currentDropTarget.DragLeave(element);
}
m_currentDropTarget = null;
}
if ((value != null) && value.CanDropElement(element, mousePosition))
{
m_currentDropTarget = value;
if (raiseDragEvents)
{
m_currentDropTarget.DragEnter(element);
}
}
this.OnPropertyChanged("CurrentDropTarget");
}
static void SendDragAndDropEvent(IDragAndDropEvent evt, List <ISelectable> selection, IDropTarget dropTarget, ISelection dragSource)
{
if (dropTarget == null)
{
return;
}
EventBase e = evt as EventBase;
if (e.eventTypeId == DragExitedEvent.TypeId())
{
dropTarget.DragExited();
}
else if (e.eventTypeId == DragEnterEvent.TypeId())
{
dropTarget.DragEnter(evt as DragEnterEvent, selection, dropTarget, dragSource);
}
else if (e.eventTypeId == DragLeaveEvent.TypeId())
{
dropTarget.DragLeave(evt as DragLeaveEvent, selection, dropTarget, dragSource);
}
if (!dropTarget.CanAcceptDrop(selection))
{
return;
}
if (e.eventTypeId == DragPerformEvent.TypeId())
{
dropTarget.DragPerform(evt as DragPerformEvent, selection, dropTarget, dragSource);
}
else if (e.eventTypeId == DragUpdatedEvent.TypeId())
{
dropTarget.DragUpdated(evt as DragUpdatedEvent, selection, dropTarget, dragSource);
}
}