Path: utzoo!news-server.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!magnus.ircc.ohio-state.edu!zaphod.mps.ohio-state.edu!usc!snorkelwacker.mit.edu!bloom-beacon!dont-send-mail-to-path-lines
From: mouse@lightning.mcrcim.mcgill.EDU (der Mouse)
Newsgroups: comp.windows.x
Subject: Re:  Double Mouseclicks and XImage buffer size
Message-ID: <9103100859.AA08333@lightning.McRCIM.McGill.EDU>
Date: 10 Mar 91 08:59:52 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 24

> 1) How can I detect double mouse clicks in a portable way?

You can't.  As you've noticed, there is no way to ask the server for a
timer event, or anything similar.

> I have written a loop that sleeps for a small period of time and then
> checks the event queue.  After the double-mouse-click interval has
> passed (and no events are detected) I note a single mouse click.

It would be better to wait until an event is received, and if you don't
get any, force the server to generate one (such as a zero-length append
to a property).  Then you can get your time values from the server all
the time, thus making the code reliable, even if it does require an
extra round-trip.  (Why don't I count this as "portable"?  Because it
involves playing with (typically) sub-second timeout values.)

I'm hoping R5 will improve this.  One of the talks at the X conference
included something about an input server sort of thing; if done right,
this should be able to cure things.

					der Mouse

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