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From: sherouse@godot.radonc.unc.edu (George W. Sherouse)
Newsgroups: comp.windows.x
Subject: bug/misfeature with (Button*MotionMask | PointerMotionHintMask)?
Message-ID: <873@godot.radonc.unc.edu>
Date: Mon, 28-Sep-87 10:07:49 EDT
Article-I.D.: godot.873
Posted: Mon Sep 28 10:07:49 1987
Date-Received: Tue, 29-Sep-87 05:36:19 EDT
Reply-To: sherouse@godot.UUCP (George W. Sherouse)
Distribution: world
Organization: Radiation Oncology NCMH/UNC, Chapel Hill, NC
Lines: 50
Keywords: bugs and/or ignorance run rampant


I would very much like to select motion events on Button2-down in such
a away that I receive a sparse stream of "sorta-latest" positions
rather than a very fine-grained stream of barely-perceptible motions.
In X10 this compression was semi-automatic - if you wanted to see all
events you had to say so with XExpandEvents.

[In the following please excuse the many waffle words but the document
is abundantly unhelpful regarding these details.]

It appears that the X11 routine XGetMotionEvents was intended to
provide this functionality by allowing me to skim all the MotionNotify
events off the queue whenever I needed to and compress them myself.
It further appears that PointerMotionHintMask is intended to partially
address this as well but by my reading does not guarantee that you
will receive an event reflecting the latest stop position unless you
release the button.

Well,

1.  I have been unable to bet XGetMotionEvents to return any more than
0 events under any circumstances.  I have twiddled *everything*.
What's the magic?  BTW, where is the meaning of the Time structure
defined?  Yes, I know it is milliseconds, but milliseconds since Jim
Gettys' birth or what?  I have been setting 'start' to the time of the
first motion event I see and adding 1000 to that for 'stop'.  I would
expect that to return all events within one second after the first
event.  I have also tried numerous other fruitless variations.

2.  I have been unable to generate a motion event with state ==
'NotifyHint'.

3.  Is PointerMotionHintMask intended to be a modifier of the other
MotionMasks or a peer?  That is, am I supposed to get hints about
motion with button2 pressed or ((hints about motion) && (button2
pressed motion events)) if I specify (PointerMotionHintMask |
Button2MotionMask)?

4.  It appears that (PointerMotionMask | PointerMotionHintMask)
generates events with much coarser granularity (perhaps compressed?)
than does PointerMotionMask alone or Button2MotionMask alone or
(Button2MotionMask | PointerMotionHintMask).

I apologize if there is something "well documented" which I am missing
but god knows, I've tried...  :-)  Thanks for any insight.

Configuration: clients running on a VAX-11/750 under BSD 4.3, server
running on an 8-plane VAXstation-II/GPX under Ultrix 1.2.

- George