Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!uwm.edu!cs.utexas.edu!uunet!ingr!b11!doyle
From: doyle@b11.ingr.com (Doyle Davidson)
Newsgroups: comp.windows.x
Subject: How we got Single Clicks in X
Message-ID: <6403@b11.ingr.com>
Date: 31 Oct 89 23:04:49 GMT
Organization: Intergraph Corp. Huntsville, AL
Lines: 36


We had a need for button clicks (i.e. down-up-timeout) 
and button presses (down-timeout) in X and it had to be reliable.  

Our solution?  
Add a button timeout extension!

What we basically did was create a new event type that
was generated some 'Y' amount of time after the last 
button transition.  Thus to detect the difference between
and press and a click, we will get one of the two event
sequences:
    press-release	(and soon a timeout or another press)
	or
    press-timeout	(and eventually the release and another timeout)
We added new requests so that only those windows that wanted timeout
events got them and nothing ever disturbs regular X clients.
Grabs are also handled nicely as well as multiple clicks while crossing
window edges!  (timeouts are generated when you leave the window)

This way network delays are not a problem!!!

Anybody see any holes?

Doyle (is it too late to change r4? or wait for X12 :-) Davidson

-------------------------------
Doyle C. Davidson              
Intergraph Corp.               
Workstation Graphics Standards 
1 Madison Industrial Park      
Huntsville, AL 35806           
(205) 772-2000                 
                               
..!uunet!ingr!b11!doyled!doyle 
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