TreeViewDropTargetObserver::TreeViewDragEntered

Event handler for the drag entered notification.

virtual void TreeViewDragEntered (
    const TreeViewDropTargetEvent & ev,
    DragDrop::Effect *  effect,
    bool *              defBehaviour
);

Parameters

ev

A reference to the event.

effect

Drag and drop effect can take the following values: DragDrop::Reject, DragDrop::Accept, DragDrop::Copy, DragDrop::Move, DragDrop::Link, DragDrop::Delete.

defBehaviour

true by default. If true, the default target drag and drop behaviour implemented by the Dialog Manager is used. This includes event management and feedback.

Description

Use this event to decide whether to accept or reject the current drag and drop operation. If your application requires this is the place to initialize a drop target user feedback.

Example

// Method Example:
void	DragTab2Observer::TreeViewDragEntered (const DG::TreeViewDropTargetEvent& ev, DG::DragDrop::Effect* effect,
											   bool* /*defBehaviour*/)
{
	if (ev.HasDataFormat ('LBEX') || ev.HasDataFormat ('TVEX'))
		*effect = DG::DragDrop::Accept;
}