Path: utzoo!attcan!uunet!cs.utexas.edu!usc!elroy.jpl.nasa.gov!zardoz.cpd.com!dhw68k!thecloud
From: thecloud@dhw68k.cts.com (Ken McLeod)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Wanted: a window that comes up in black
Message-ID: <1990Jul6.232940.14141@dhw68k.cts.com>
Date: 6 Jul 90 23:29:40 GMT
References: <1115@peyote.cactus.org> <3794@rodan.acs.syr.edu> <23026@dartvax.Dartmouth.EDU>
Reply-To: thecloud@dhw68k.cts.com (Ken McLeod)
Organization: Wolfskill & Dowling residence; Anaheim, CA (USA)
Lines: 32

In article <23026@dartvax.Dartmouth.EDU> anarch@eleazar.dartmouth.edu (The Anarch) writes:
>     Apologies if this is an elementary question; I'm still pretty new to Mac
>programming.  Anyway, I'm trying to get a window to come up onscreen with a
>black content region.  Now I know that I can easily do NewWindow and then
>PaintRect the window's body, but that causes a brief white flash, which I'd
>like to avoid but have been unable to get rid of.  What I *have* tried:
>changing the bkColor and bkPat for the window in various ways before a
>ShowWindow; I haven't gotten any positive results.

 When a new window is created, the window manager looks at the low-memory
global PaintWhite (a word at $9DC). If it's non-zero, the window's content
region is erased to white; otherwise, it isn't. Something like the following
has worked for me before...

short savedPaintWhite;

savedPaintWhite = PaintWhite;
PaintWhite = 0;
foo = NewWindow(...)
PaintWhite = savedPaintWhite;

 Disclaimer/warning: this code modifies the contents of a low-memory global,
and as such is Dangerous (even though IM I-297 condones the clearing of
PaintWhite).

 -ken

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