Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!decwrl!shelby!polya!kaufman
From: kaufman@polya.Stanford.EDU (Marc T. Kaufman)
Newsgroups: comp.sys.mac.programmer
Subject: Re: SrollRect Hassles
Message-ID: <7486@polya.Stanford.EDU>
Date: 7 Mar 89 17:31:46 GMT
References: <1733@psu-cs.UUCP> <2525@ilium.cs.swarthmore.edu>
Sender: Marc T. Kaufman <kaufman@polya.Stanford.EDU>
Reply-To: kaufman@polya.Stanford.EDU (Marc T. Kaufman)
Distribution: usa
Organization: Stanford University
Lines: 16

In article <2525@ilium.cs.swarthmore.edu> jackiw@ilium.UUCP (Nick Jackiw) writes:

>Second, note that I.M. doesn't say you can pass a null updateRgn as your
>last parameter, the way you CAN pass a null maskRgn to copybits. I've had
>some difficulties (i. e. crashes) with attempting to pass a NIL handle for
>updateRgn.  Try instead to pass an EMPTY rgn:

->aRgn:=NewRgn;
->ScrollRect(...,aRgn);

	at this point, do: InvalRgn (aRgn);
	to add the fresh area to the update area.

->DisposeRgn(aRgn);

Marc Kaufman (kaufman@polya.stanford.edu)