Path: utzoo!attcan!uunet!cs.utexas.edu!usc!apple!apple.com!chewy
From: chewy@apple.com (Paul Snively)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Window Manager
Message-ID: <7643@goofy.Apple.COM>
Date: 11 Apr 90 18:21:55 GMT
Sender: usenet@Apple.COM
Organization: Apple Computer, Inc.
Lines: 53
References:<3047@dciem.dciem.dnd.ca> <7617@goofy.Apple.COM> <17179@well.sf.ca.us>

In article <17179@well.sf.ca.us> oster@well.sf.ca.us (David Phillip Oster) 
writes:
> In article <7617@goofy.Apple.COM> chewy@apple.com (Paul Snively) writes:
> >In article <3047@dciem.dciem.dnd.ca> juana@dciem.dciem.dnd.ca (Juana 
> >Chang) writes:
> >> After a dialog has been displayed over my windows, chunks of my 
windows
> >> have been erased by the dialog.  Which functions should I use to 
re-draw 
> >my
> >> windows ?
> >> 
> >> Should I use:
> >> 
> GetPort(&savePort);
> SetPort((WindowPtr) event->messaege);
> >> BeginUpdate( ptr_mywindow );
> >> re-draw window...
> >> EndUpdate( ptr_mywindow );
> SetPort(savePort);
> >> 
> >> ?????
> >
> >Yes.
> >
> That is not quite fair. A better answer would be that you should have 
code like
> that in your update event handler, and that if you are not calling your
> main event handler because you are stuck in some modal dialog, you should
> pass ModalDialog() or Alert a pointer to a filer function that checks the
> event->what field of its event argument. If it is an update event and the
> destination (event-.message) is not the FrontWindow(), then hand it to 
your
> main even yhandfler to dispatch to the appropriate window.
> -- 
> -- David Phillip Oster - Note new address. Old one has gone Bye Bye.
> -- oster@well.sf.ca.us = {backbone}!well!oster

Oops.  You're unquestionably right.  I was (most likely erroneously) reading the post to mean "how do I update the blotched windows after the dialog has been dismissed," as opposed to "how can I avoid ugly un-updated regions in cases where I don't update between having occlusions that aren't completely subsumed by successive occlusions?"  (Sorry for the contorted English!)  In other words, I imagine that I misinterpreted the question.

Given the second interpretation of the question, your answer is indeed the correct approach.
__________________________________________________________________________
                                Paul Snively
                      Macintosh Developer Technical Support
                             Apple Computer, Inc.

1st Choice: Paul_Snively.DTS@gateway.qm.apple.com
2nd Choice: CHEWBACCA@applelink.apple.com
Last Choice: chewy@apple.com

Just because I work for Apple Computer, Inc. doesn't mean that I believe 
what they believe, or vice-versa.
__________________________________________________________________________