Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!thyme!kaleb
From: kaleb@thyme.jpl.nasa.gov (Kaleb Keithley)
Newsgroups: comp.windows.x
Subject: bizarre behaviour???
Message-ID: <1990Dec6.201917.11507@thyme.jpl.nasa.gov>
Date: 6 Dec 90 20:19:17 GMT
Sender: kaleb@thyme.jpl.nasa.gov (Kaleb Keithley	)
Organization: Jet Propulsion Laboratory, Pasadena, CA
Lines: 27

In Xlib, if I create an InputOnly window, with a depth of 0 and no background
attributes, on top of another window, I get a transparent window on which 
I can select for events and "see through" to the parent underneath, i.e. 
I can see text and graphics that are being drawn dynamically on the parent.

If I change if from an InputOnly window to an InputOutput window, (yes,
I know that a depth of 0 on an InputOutput means CopyFromParent) then,
rather than seeing what's on the parent, I get a "hole" through my
application and can see whatever was underneath when the expose event
was received, e.g. root window root-weave, other applications, etc.
(note that what is displayed "underneath" does not change until another
expose event is received.)

I'd like to have a transparent InputOutput window.  I've looked through
the Server dix code for CreateWindow, but alas, I don't see anything
that looks relevent.  The above described behaviour seems odd to me; I'm 
reluctant to call it a bug though.

Sun 4/330, SunOS 4.1, MIT X11R4.18.

Anyone have any thoughts?

-- 
Kaleb Keithley                      Jet Propulsion Labs
kaleb@thyme.jpl.nasa.gov

You can please all of the people some of the time,