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From: aw@cellar.bae.bellcore.com (Andrew Wason)
Newsgroups: comp.windows.x
Subject: menu with installed colormap
Message-ID: <1990Sep14.222840@cellar.bae.bellcore.com>
Date: 15 Sep 90 02:28:40 GMT
Sender: news@bellcore.bellcore.com
Reply-To: aw@cellar.bae.bellcore.com
Organization: Bell Communications Research
Lines: 40


I have a client which needs its own colormap.
I created a colormap and set the XtNcolormap resource
of the topLevelShell widget to this colormap.
I allocated 250 cells read/write out of the colormap,
leaving 6 cells shareable.

I also have a simpleMenu widget which pops up in
the topLevel widget. I checked, and the simpleMenu XtNcolormap resource
is set correctly to my new colormap (because it copies from parent by default).
However, the menu is unreadable due to the colors it is using.

The simpleMenu uses XtDefaultForeground and XtDefaultBackground
as its default colors. In lib/Xt/Converters.c CvtStringToPixel()
these strings are converted to BlackPixelOfScreen() and WhitePixelOfScreen().
These two macros return pixel values relative to the default colormap.
So, even though my colormap is currently installed,
the simpleMenu pops up with its foreground/background pixel values
incorrectly set based on the default colormap.

In CvtStringToPixel(), if the color string is anything other than
XtDefaultForeground or XtDefaultBackground then the currently installed
colormap is used. Why is the currently installed colormap ignored
for these two strings? Is this a bug in the Intrinsics?

Specifying the following in my resources makes everything work fine:
(since these strings are not XtDefaultForeground or XtDefaultBackground,
the currently installed colormap is used to determine their pixel values):

  *SimpleMenu*foreground: black
  *SimpleMenu*background: white


Thanks,
Andrew

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Andrew Wason                                        Bell Communications Research
aw@cellar.bae.bellcore.com                          Piscataway, NJ
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