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From: guido@cwi.nl (Guido van Rossum)
Newsgroups: comp.windows.x
Subject: Re: Virtual colormaps & DECwindows
Message-ID: <8286@boring.cwi.nl>
Date: 24 Jul 89 18:17:21 GMT
References: <223@nap1.cds.wpafb.af.mil> <8907240118.AA18657@jumbo.pa.dec.com>
Sender: news@cwi.nl
Reply-To: guido@cwi.nl (Guido van Rossum)
Organization: The Royal Society for Prevention of Cruelty to Amoebae
Lines: 29

Vern Staats writes:

>> Is there some way to tell dxwm to leave my map installed, or at least 
>> reinstall it when my application has focus?

Mark Manasse replies:

>The currently-shipped version of dxwm keeps 
>track of what it believes to be the focus window for colormap, and 
>keeps that window's colormap installed.  Since the current release 
>of dxwm predates the ICCCM's adoption of COLORMAP_WINDOWS, it does 
>not implement that feature of the ICCCM.
>
>Mark

Mark's explanation seems to imply that you can't get a colormap
installed at all by dxwm, but life isn't that bad.  Some playing with
Doug Young's coloredit example (which needs some lay-out changes for 256
colors, BTW!) reveals that calling XSetWindowColormap(display, window,
colormap) works, both for twm and for dxwm.  Young claims this is
the ICCCM-conformant way.  The colormap is uninstalled when the
application loses the color focus and reinstalled when it regains it.
(dxwm seems to maintain separate color and keyboard focuses; with twm,
the color map seems to simply follow the keyboard focus).

--
Guido van Rossum, Centre for Mathematics and Computer Science (CWI), Amsterdam
guido@cwi.nl or mcvax!guido or guido%cwi.nl@uunet.uu.net
"Repo man has all night, every night."