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Catching window expose event

Posted on 1997-12-30
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Last Modified: 2008-02-07
When I move another windowA over windowB, things I draw on
WindowB will get erased.  How can I catch the "expose" event
on Window B so that I can redraw WindowB ?  Does it tell me
which part of WindowB are being exposed so I only redraw
that part ?
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Question by:hori
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russgold earned 100 total points
ID: 1231888
Unfortunately not.  It simply calls your paint() method whenever it wants to refresh any part of the component - and doesn't pass the visible area.  If you have a lot of computations, move them out of your paint method.  If you are using a lot of graphics overlaying each other, use an offscreen bitmap to minimize the redraw overhead.  Currently, that is the best you can do in Java.
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