Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cbmvax!peter
From: peter@cbmvax.commodore.com (Peter Cherna)
Newsgroups: comp.sys.amiga.programmer
Subject: Re:  Prop gadgets and FOLLOWMOUSE
Message-ID: <18813@cbmvax.commodore.com>
Date: 11 Feb 91 17:23:27 GMT
References: <1991Feb8.213305.15745@ssd.kodak.com>
Reply-To: peter@cbmvax.commodore.com (Peter Cherna)
Distribution: usa
Organization: Commodore, West Chester, PA
Lines: 27

In article <1991Feb8.213305.15745@ssd.kodak.com> hoffmann@acl.kodak.com (marty hoffmann) writes:
>If I want to update screen information (like a counter) while the user
>slides a proportional gadget, I create the gadget with GADGIMMEDIATE 
>and RELVERIFY.  When I get a GADGETDOWN message for the gadget, I 
>enter a tight loop, reading the pot values directly from the PropInfo
>structure and updating the screen accordingly.

Aaaak.  Why do you use a tight loop?  That's equivalent to busy
waiting, which is bad in a multitasking environment.  You should
use FOLLOWMOUSE and wait for MOUSEMOVE events.  Only update your
view of the world when you get MOUSEMOVEs.  Some people refresh
every INTUITICK instead of using MOUSEMOVE, but I recommend
MOUSEMOVE.

Here's an additional tip:  if your prop gadget represents a number
(say) from 1 to 10, then you'll get several MOUSEMOVEs for each
level.  Make sure the level actually changes before refreshing
whatever changes (eg. a list moves).

>						Marty Hoffmann 

     Peter
--
     Peter Cherna, Software Engineer, Commodore-Amiga, Inc.
     {uunet|rutgers}!cbmvax!peter    peter@cbmvax.commodore.com
My opinions do not necessarily represent the opinions of my employer.
"Oh, PIN-compatible!  I thought you wanted me to make it IN-compatible!"