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From: mouse@larry.mcrcim.mcgill.EDU
Newsgroups: comp.windows.x
Subject: Re:  ICCCM question on InputFocus
Message-ID: <9101060712.AA19844@Larry.McRCIM.McGill.EDU>
Date: 6 Jan 91 07:12:02 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 29

>>> I have an application with multiple documents, and I need some way
>>> of determining which document is "current".  Users make documents
>>> current by clicking on them on the Mac.  The X equivalent seems to
>>> be FocusIn events,
>> Depending on precisely what you want, the equivalent is either
>> ButtonPress or FocusIn.  If you want to choose among multiple
>> top-level windows, I would recommend FocusIn.
> I don't think that that's sufficient.  Epoch faces this problem also,
> and in order for things to work (mostly) right, it is necessary to
> track both focus events and window transition events.

Yes, you are of course correct.  I apologize; I should have thought
about it before posting.  I even know this; when writing mterm's code
to determine whether it has keyboard focus I had to go to some length
to get it right.  (I think it is sufficient to track FocusChangeMask,
EnterWindowMask, and LeaveWindowMask on your top-level window and
FocusChangeMask on the root of the screen you're on.  The decision of
what to do on each event received requires a couple of state variables,
but I *think* I have it working.

The table describing what actions to take in what circumstances is long
enough that I'm reluctant to include it here; anyone who wants a copy
can send me mail, and in the unlikely event that I get a great flood of
requests, I'll post it.

					der Mouse

			old: mcgill-vision!mouse
			new: mouse@larry.mcrcim.mcgill.edu