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From: hamachi@KIM (Gordon Hamachi)
Newsgroups: net.micro.mac
Subject: Grow Regions
Message-ID: <8512060411.AA13585@kim>
Date: Thu, 5-Dec-85 23:11:21 EST
Article-I.D.: kim.8512060411.AA13585
Posted: Thu Dec  5 23:11:21 1985
Date-Received: Sat, 7-Dec-85 03:45:45 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: University of California at Berkeley
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Forwarded message:
=================

Subject: Grow Regions: How do they do that?

    Attention, Real Hackers.  Here's a tough one for you: When the mouse is
held down in the Grow box of a window and dragged, a gray outline of
the window follows it around.  Likewise, in MacPaint or the Finder, you can 
use a rectangle, which also appears in blinking gray, to select.  Now, this
has got to be a non-trivial operation, saving the bits under the outline,
writing the outline, then restoring the saved bits after the outline moves.
Do we mortals have access to some semi-highlevel routine which does this for
us?  Or am I going to have to kludge something up?  Many thanks in advance.

Steve Upstill