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From: bobh@twinkie.bellcore.com (Robert Hettmansperger)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Updating ICONs in a dialog box
Keywords: ICONs Dialog Box Update
Message-ID: <1991Apr4.140811.15901@bellcore.bellcore.com>
Date: 4 Apr 91 14:08:11 GMT
References: <1991Apr3.142215.2787@bellcore.bellcore.com>
Sender: usenet@bellcore.bellcore.com (Poster of News)
Reply-To: bobh@twinkie.bellcore.com (Robert Hettmansperger)
Followup-To: bobh@twinkie.bellcore.com
Organization: Bell Communications Research, Red Bank, New Jersey
Lines: 25

In article <1991Apr3.142215.2787@bellcore.bellcore.com> I wrote:
>
>The problem is that the text updates as I expected, but in order to get the
>new icon to appear, I have to call DrawDialog to redraw the entire dialog
>box.  This is slow and makes the entire dialog flicker.  I have tried almost 
>everything to get just the icon redrawn and can't come up with anything else 
>that works.
>

Thanks to all who responded.  The easiest solution turned out to be just to
set the current GrafPort to the dialog box and call PlotIcon to draw the icon
directly.  

Interestingly, the most common recommendation was to flag the icon's rectangle
for updating with InvalRect.  I couldn't get this to work at all.  I'm not
sure if it was just due to differences in the dialog vs. the window manager,
or if I just wasn't doing it right.

Thanks again,

Bob Hettmansperger          bobh@twinkie.bellcore.com

P.S.  Another suggestion was to make the icon a user item, but I couldn't 
      manage to set up the procedure pointer to be called as the "item" in
      SetDItem.  Anyone have suggestions on writing userItems with Think's C?