Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!ncar!ico!auto-trol!marbru
From: marbru@auto-trol.UUCP (Martin Brunecky)
Newsgroups: comp.windows.x
Subject: Re: Can widget have transparent window? (O'Reilly V4 5.3.8)
Keywords: widget
Message-ID: <805@auto-trol.UUCP>
Date: 2 Sep 90 00:48:11 GMT
References: <115@bwilab3.UUCP>
Reply-To: marbru@auto-trol.UUCP (Martin Brunecky)
Organization: Auto-trol Technology, Denver
Lines: 32

In article <115@bwilab3.UUCP> cb@bwilab3.UUCP (CB Genrich) writes:
>In O'Reilly "X Toolkit Intrinsics: Programming Manual (Volume Four),
>section 5.3.8 (page 156 in my copy), the authors state:
>
>  Background     can be a solid color, pattern, or transparent.
>
>I have tried to get a transparent widget, using code similar to example
>5-13, but it is not transparent.
>
>Any ideas? Please elaborate.
>
   .... lots has been said so far.
   Yes, you can change any widget's window to be transparent; you just
   mus realize it, get the window ID (XtWindow(w)), and then change
   window attributes as you wish. Yes, it is NOT kosher to do it to
   a poor widget, but unless you mix it with XtSetValues, you may get
   what you want.
   Now what you want is a different story. By "transparent" X means
   that window will retain parent's pixels. This is a little strange
   definition of transparency, but be it. In addition, any exposure
   events will be signalled on your "transparent" window, since it
   obscures (yes, transparent window obscures) the window underneath
   it.
   Another special window is an input-only window. This is what it says
   to be - nothing on the screen, but it can capture any input.


-- 
=*= Opinions presented here are solely of my own and not those of Auto-trol =*=
Martin Brunecky                   marbru@auto-trol.COM
(303) 252-2499                    {...}ncar!ico!auto-trol!marbru
Auto-trol Technology Corp. 12500 North Washington St., Denver, CO 80241-2404