Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!caen!kuhub.cc.ukans.edu!2fmlcalls
From: 2fmlcalls@kuhub.cc.ukans.edu
Newsgroups: comp.sys.mac.programmer
Subject: Re: Unexpected Update Events
Message-ID: <1991Apr29.192210.30183@kuhub.cc.ukans.edu>
Date: 29 Apr 91 19:22:10 CDT
References: <11082@bunny.GTE.COM> <1991Apr29.170744.12029@news.iastate.edu>
Organization: University of Kansas Academic Computing Services
Lines: 23

In article <1991Apr29.170744.12029@news.iastate.edu>, niko@iastate.edu (Schuessler Nikolaus E) writes:
> In article <11082@bunny.GTE.COM> CAH0@bunny.gte.com (Chuck Hoffman) writes:
>>three windows open.  With the Debugger, I'm finding that about every 
>>second there is an update event generated for one or the other of the 
>>second and third windows.  I get all the update events I expect; these are 
> 
> I was writing a game and it only had one window.  I had it redraw the
> screen every time there was an update event... Same problem!  There
> were so many update events that that the screen constantly flickered
> while it was doing the updating...
> 
> doesn't GetNextEvent remove the event?
> Do you HAVE to use the BEGIN UPDATE and END UPDATE procedures to
> get it to stop?

No - GetNextEvent does not remove it.  My understanding is that the event is
removed, but the update rgn is not cleared.  Begin/EndUpdate do that.

So, yes, you need BeginUpdate and EndUpdate.
(Don't bum, I had the same problem once and it was a game as well - real fast
game, huh? :))

john calhoun