Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!mit-eddie!uw-beaver!ubc-cs!horsch
From: horsch@cs.ubc.ca (Michael Horsch)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: Reading both buttons from Eventmulti
Message-ID: <10330@ubc-cs.UUCP>
Date: 3 Nov 90 18:45:37 GMT
References: <9479@jarthur.Claremont.EDU> <3209@medusa.informatik.uni-erlangen.de>
Sender: news@cs.ubc.ca
Followup-To: comp.sys.atari.st.tech
Distribution: comp.sys.atari.st.tech
Organization: University of British Columbia, Vancouver, B.C., Canada
Lines: 49


In article <3209@medusa.informatik.uni-erlangen.de> csbrod@medusa.informatik.uni-erlangen.de (Claus Brod ) writes:
:dcrevier@jarthur.Claremont.EDU (Dan Crevier) writes:
:
:>I remember a while ago people were discussing how to get an event from the
:>right button _or_ the left button.  
:
:One method - undocumented though, but valid for all TOS/GEM versions -
:is to add 256 to the number of clicks waited for. This negates the condition
:for a return from evnt_multi due to clicks. Example:
:
:	mstate = 0
:	mclicks = 256+2
:	mbuttons = 3
:
:This means: Wait for 'NOT both buttons released' = 'One button clicked'.
:
:I know this is undocumented stuff but _very_ useful. And I would love it
:if Mr Pratt or someone else at ATARI could promise us that this feature
:will stay. PLEASE Mr Pratt - do us a favour. The only other way I know
:of something like selective mouse click waiting can be done is linking
:into the mouse vectors and - whenever the right button is clicked -
:pretending that it is indeed the left one. But this causes much trouble
:everywhere, and it is not even completely legal - after all, you have
:to use those VDI mouse movement vector exchange routines that are
:reserved for AES use only.

So what's wrong with alternating the value of mbuttons in the
loop containing event_multi()?  On each pass through the loop, 
check for only one button, and at the end of the loop change the
value of mbuttons to the other mouse button (ex-or mbuttons with
3).  Easy.

This is completely legal, maintains consistency and context, and 
it even works.  I've used it myself.  I can't think of any reason 
that this idea might interfere with any other legal use of AES 
stuff.

:----------------------------------------------------------------------
:Claus Brod, Am Felsenkeller 2,			Things. Take. Time.
:D-8772 Marktheidenfeld, West Germany		(Piet Hein)
:csbrod@medusa.informatik.uni-erlangen.de
:----------------------------------------------------------------------

Mike

--
Michael C. Horsch		Dept. of Computer Science, 
horsch@cs.ubc.ca		University of British Columbia