protected virtual void OnGetDragEffects(DragDropEffectsEventArgs e)
{
EventHandler <DragDropEffectsEventArgs> handler = GetDragEffects;
if (handler != null)
{
handler(this, e);
}
}
private void BeginDragDrop(Point startingPoint)
{
DataObjectEventArgs e = new DataObjectEventArgs(startingPoint);
OnGetDataObject(e);
object data = e.DataObject;
if (data == null)
{
return;
}
DragDropEffectsEventArgs de = new DragDropEffectsEventArgs();
OnGetDragEffects(de);
DragDropEffects allowedEffects = de.DragDropEffects;
DragDropEffects effects = DoDragDrop(data, allowedEffects);
DragDropEffectsEventArgs finishedArgs = new DragDropEffectsEventArgs();
finishedArgs.DragDropEffects = effects;
DragDropEventArgs ddea = new DragDropEventArgs(data, startingPoint, allowedEffects, effects);
OnDragCompleted(ddea);
}
