void PerformDragDrop(MouseEventArgs e, Point ptMouse)
{
// Remember what mi are selected. We may be deleting this if this is a move operation
ArrayList alsmiSelected = m_lvld.Selection;
IMapItem[] amiMove = (IMapItem[])alsmiSelected.ToArray(typeof(IMapItem));
// Prepare a data object for drag drop
LevelData ldat = PrepareLevelData(ptMouse.X, ptMouse.Y, GetTileSize(), (IMapItem[])alsmiSelected.ToArray(typeof(IMapItem)));
// Normal operation is a move unless control key is press in which case it is
// a copy
DragDropEffects eff = DragDropEffects.Move;
if ((Control.ModifierKeys & Keys.Control) == Keys.Control)
{
eff = DragDropEffects.Copy;
}
// Perform the drag drop. If it was cancelled, nothing to do.
DragDropEffects effActual = DoDragDrop(ldat, eff);
if (effActual == DragDropEffects.None)
{
return;
}
// If a move actually did occur, then remove the originals
if ((effActual & DragDropEffects.Move) != 0)
{
m_lvld.RemoveMapItems(amiMove);
}
}
