Path: utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!bloom-beacon!LARRY.MCRCIM.MCGILL.EDU!mouse
From: mouse@LARRY.MCRCIM.MCGILL.EDU (der Mouse)
Newsgroups: comp.windows.x
Subject: Re: X11R3: PointerMotionMask misbehaving
Message-ID: <8904062248.AA28729@Larry.McRCIM.McGill.EDU>
Date: 6 Apr 89 22:48:01 GMT
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 25

>> [using grabs]
>> The problem is, I never see a MotionNotify event.

> I took a look at the code you sent me, and discovered that you're
> calling XGrabPointer with a confine-to window that has never been
> mapped.  That's a no-no, and causes the grab to fail.  XGrabPointer
> returns status GrabNotViewable, which you decided not to check (shame
> on you).  Since the grab fails, it's attempt to ask for motion events
> also fails.

You got code in an interim state, I realize upon looking back.  Mapping
the confine-to window did make the problem disappear - both problems:
the XGrabPointer works, and the MotionNotify events start coming in.

As I recall, the same was true (ie, I wasn't seeing MotionNotify
events) before I started explicitly calling XGrabPointer at all, which
leaves the question of why this was happening when the passive grab
included PointerMotionMask in its event mask....  I'll write a test
program and see if I can get the behaviour I think I got before.  I'll
report back here when I've done this.

					der Mouse

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