Path: utzoo!attcan!uunet!munnari!murtoa.cs.mu.oz.au!munnari.oz!jkjl
From: jkjl@munnari.oz (John Lim)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Modal dialog filter proc
Message-ID: <1489@murtoa.cs.mu.oz.au>
Date: 12 May 89 08:26:48 GMT
References: <18219@cup.portal.com>
Sender: news@cs.mu.oz.au
Reply-To: jkjl@munmurra.UUCP (John Lim)
Organization: University of Melbourne, Comp Sci Dept
Lines: 15

In article <18219@cup.portal.com> nicky@cup.portal.com (nick john pilch) writes:
-Below is the code for a modal dialog filter proc that seems to have a problem.
-The relevant part of this function draws a border around the default
-button whenever the dialog gets an update event.  It then returns FALSE
-to signal Modal Dialog to handle the update event also (draw the rest of the 
-dialog).  The problem is that sometimes the dialog keeps getting update
-events until doomsday.  My filter proc then proceeds to keep drawing the
-border over and over again.  Anyone have any clues?  A related problem is

HA ! A very common mistake to make ( i used to make it myself until i 
got smarter :-)

You are not clearing the updateRgn of your window.
Try returning TRUE on updateEvents OR use BeginUpdate and EndUpdate
in your filterProc.