The following example extends the previous one by deriving a new notification class to carry additional information. The class, TShapeNotification, will contain a copy of the shape that was added or removed. TShapeView uses this additional information to invalidate only this area.
NOTE 
A copy of the shape is passed, rather than a pointer, because the semantics of TNotification require that notifications are capable of streaming across address spaces.
Click the icon to mail questions or corrections about this material to Taligent personnel.