Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!apple!well!wdh
From: wdh@well.sf.ca.us (Bill Hofmann)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Unexpected Update Events
Message-ID: <24510@well.sf.ca.us>
Date: 30 Apr 91 16:17:50 GMT
References: <11082@bunny.GTE.COM> <1991Apr29.170744.12029@news.iastate.edu>
Organization: Flashpoint
Lines: 17

In article <1991Apr29.170744.12029@news.iastate.edu> niko@iastate.edu (Schuessler Nikolaus E) writes:
>doesn't GetNextEvent remove the event?
>Do you HAVE to use the BEGIN UPDATE and END UPDATE procedures to
>get it to stop?
YES!  The updateEvt is generated by the Event Manager whenever no other events
are pending.  What it does is look down the list of open windows, and if
the window "needs to be updated", an update event is generated.  BeginUpdate/
EndUpdate signal the system that the update has been handled.  One poorly
documented fact is that BeginUpdate/EndUpdate is not reentrant.  Don't try
to call GNE/WNE inside it, you'll regret it.

As for the other person's problem, it may be because you're stepping in the
debugger, and the debugger windows cover your windows.  I believe there's
a flag which you can set in the project to make the debugger prevent this
(you may need to boost the debugger partition size).

-Bill Hofmann