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From: bradley@dsl.cis.upenn.edu (John Bradley)
Newsgroups: comp.windows.x
Subject: Configure/Expose event ordering.
Message-ID: <2259@super.upenn.edu>
Date: Wed, 21-Oct-87 18:23:49 EDT
Article-I.D.: super.2259
Posted: Wed Oct 21 18:23:49 1987
Date-Received: Sat, 24-Oct-87 07:00:43 EDT
Sender: news@super.upenn.edu
Reply-To: bradley@cis.upenn.edu (John Bradley)
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Organization: University of Pennsylvania
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I'm writing a *very* simple-minded program that merely displays some crap in
a window, and when you click the mouse in it, it goes away.  It also has to
keep the window contents accurate when it's exposed, or re-sized.

My problem is this.  I've set the event mask to "ButtonPressMask | ExposureMask
   | StructureNotifyMask".  In my main loop I simply check for those three
events.  Everything works well until I re-size the window (via uwm).  When I
do, I get an ExposeEvent, followed by a Configure and another Expose.  This
causes the program to redraw the contents of the window twice, the first time
scaled wrong.

My question is:  "Why do I get the first Expose event?"  Should I peek ahead
for a Configure event whenever I get an Expose, and if so, don't bother
redrawing?  Seems unclean.  

Suggestions gleefully accepted.

John Bradley  -  University of Pennsylvania