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CMSC 433, Fall 2002
92
Multiple Window Systems
•
Want portability to different window systems
–
similar to multiple look
-
and
-
feel problem, but different
vendors will build widgets differently
•
Solution:
–
define abstract class Window, with basic window
functionality (e.g., draw,
iconify
, move, resize, etc.)
–
define concrete subclasses for specific types of
windows (e.g., dialog, application, icon, etc.)
–
define
WindowImp
hierarchy to handle window
implementation by a vendor
CMSC 433, Fall 2002
93
Implementation
