void BuildBmpSource(object data, Rectangle sourceRange, GenerateImageCallBack dragImageCreator)
{
if (BmpSource != null)
{
BmpSource.Dispose();
BmpSource = null;
}
if (dragImageCreator != null)
{
BmpSource = dragImageCreator(data);
}
else
{
if (Owner == null || !Owner.Created || sourceRange.Width <= 0 || sourceRange.Height <= 0)
{
return;
}
BmpSource = new Bitmap(sourceRange.Width, sourceRange.Height);
Owner.DrawToBitmap(BmpSource, sourceRange, 0, 0);
}
}
public void BeginDrag(object data, Rectangle sourceRange, Rectangle moveRange, Point mousePos, GenerateImageCallBack dragImageCreator)
{
SourceRange = sourceRange;
MoveRange = moveRange;
DragObject = data;
IsDraging = false;
if (Owner == null)
{
return;
}
RelativeMousePos = new Point(sourceRange.X - mousePos.X, sourceRange.Y - mousePos.Y);
IsDraging = true;
if (DraggingFeedback != DragFeedbackType.None)
{
if (DragginBox == null)
{
DragginBox = new DragBmpWin(this, DraggingFeedback == DragFeedbackType.SubControl ? Owner : null);
}
BuildBmpSource(data, sourceRange, dragImageCreator);
DragginBox.Show(BmpSource, new Point(sourceRange.X, sourceRange.Y));
}
}