Two questions

[Richard Gaskin]

Thomas J McGrath III wrote:

> You see getting the screenRect is one thing but knowing when the
> screenRect is changed is what I want. I would prefer not to run a loop
> all of the time checking and waiting for the user to change it.

How often will your users change their resolution?

FWIW, spot-checking the behavior elsewhere I find that Outlook Express,
Mozilla, and even the 10.2.8 Finder do not account for resolution reduction
dynamically, and I suspect many other apps don't either.  At least you're in
good company. ;)

If there's a reason to believe customers of your app will be unusually prone
to adjusting their resolution during their session with your app (that rules
out most Win users since most of the ones I've supported have never seen
their Display control panel <g>), polling on one-second intervals should
cover what you need without a noticeable decrease in performance.

In fact, it turns out to be barely measureable: to respond to a message and
check the screenRect takes about 0.037ms on my old 500MHz G4 (testing script
copied below).

While you're at it, it might be useful to Bugzilla an enhancement request
for a new resolutionChanged message.

-- 
 Richard Gaskin 
 Fourth World Media Corporation
 ___________________________________________________________
 Ambassador at FourthWorld.com       http://www.FourthWorld.com
 Tel: 323-225-3717                       AIM: FourthWorldInc


on mouseUp
   global gSaveScreenRect
   put the screenRect into gSaveScreenRect
   put 1000 into n
   put the millisecs into t
   --
   repeat n
      send "checkResolution" to me
   end repeat
   --
   put (the millisecs - t ) / n
end mouseUp

on checkResolution
   global gSaveScreenRect
   if the screenrect<> gSaveScreenRect then
      answer "it changed"
   end if
end checkResolution