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From: terence@hkov04.dec.com (Terence Lee @HKO, Digital Equipment Corporation)
Newsgroups: comp.windows.x
Subject: Re: Can widget have transparent window? (O'Reilly V4 5.3.8)
Message-ID: <1901@mountn.dec.com>
Date: 7 Sep 90 16:37:20 GMT
Sender: news@mountn.dec.com
Organization: Digital Equipment Corporation, Hong Kong
Lines: 44


In article <805@auto-trol.UUCP>, marbru@auto-trol.UUCP (Martin Brunecky) writes...
#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 

    Why people want to have a transparent window? Are they trying to use it
    to produce the rubberband effect?

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Terence Lee          | terence%hkov04.dec@decwrl.dec.com
                     | root%hkvs04.dec@decwrl.dec.com
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From Middlesex, UWO  | Just forget what I've said. I don't know it neither.
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