Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!elroy.jpl.nasa.gov!decwrl!shlump.nac.dec.com!mountn.dec.com!ptogpx!shatara
From: shatara@memit.enet.dec.com (Chris Shatara)
Newsgroups: comp.sys.apple
Subject: Re: Elementary (I assume) Window programming question
Message-ID: <1369@mountn.dec.com>
Date: 17 Feb 90 01:31:19 GMT
Sender: news@mountn.dec.com
Organization: Digital Equipment Corporation
Lines: 29

In article <9002161625.AA26906@tj.tis.com>, lee@TIS.COM (Theodore Lee) writes...
>....
>One thought has come to mind -- is there any usual way of updating
>windows without completely regenerating them?  Suppose you have a big


The answer is yes!  When you define the window with the window paramater 
block, you define the  wContDefProc (window content definition procedure)
as a pointer to your content drawing routine:

	wContDefProc := @DrawWindow	{DrawWindow is the procedure which
					 draws the contents of the window}

To make things go faster, you should have your window drawing procedure 
take into account the visible region of your window (assuming your using
scroll bars and not all the window is visible at a time).  This takes some 
thinking but saves a bunch of time.  

This has worked quite well for me and will do what you want.  More 
sophistication can be added by only dealing with the update region but I 
haven't found it necessary to do this.

Hope this helps...Chris

=============================================================================
|        Chris Shatara       |      Internet:    shatara@memit.enet.dec.com | 
|  Opinions expressed are    |      DEC Easynet: memit::shatara             |
|   mine and mine only!      |      UUCP:        ...!decwrl!memit!shatara   |
=============================================================================