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From: bobh@twinkie.bellcore.com (Robert Hettmansperger)
Newsgroups: comp.sys.mac.programmer
Subject: Updating ICONs in a dialog box
Keywords: ICONs Dialog Box Update
Message-ID: <1991Apr3.142215.2787@bellcore.bellcore.com>
Date: 3 Apr 91 14:22:15 GMT
Sender: usenet@bellcore.bellcore.com (Poster of News)
Reply-To: bobh@twinkie.bellcore.com (Robert Hettmansperger)
Organization: Bell Communications Research, Red Bank, New Jersey
Lines: 26

Hello, I'm in the process of developing my first "real" Mac program and
have run up against a problem with the Dialog Manager.  What I want to do
is bring up a dialog box which has a "ROTATE" button.  Basically, there is
a static text item and an icon item in the dialog, which start with default
values.  Whenever the ROTATE button is pressed the text and associated icon
should progress to the next of four possibilities (or return to the first
possibility).

To do this, I have set up four consecutive STR and ICON resources with the
desired text and icons.  When the dialog box is brought up initially, the 
first text/icon pair are displayed.  I then call ModalDialog and if the
ROTATE button was pressed, I use SetIText to change the text item (I get the
new text with GetString) and SetDItem to change the icon (I get the new icon
using GetIcon).  

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.

Does anyone have any suggestions on how to update *only* the text and icon?

Thanks,

Bob Hettmansperger           bobh@twinkie.bellcore.com