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From: mrh@Shasta.STANFORD.EDU (Marc Hannah)
Newsgroups: comp.sys.mac
Subject: Re: ZoomWindow...Help Needed
Message-ID: <994@Shasta.STANFORD.EDU>
Date: Wed, 19-Nov-86 18:44:35 EST
Article-I.D.: Shasta.994
Posted: Wed Nov 19 18:44:35 1986
Date-Received: Thu, 20-Nov-86 22:42:48 EST
References: <4319@ut-ngp.UUCP>
Distribution: world
Organization: Stanford University
Lines: 30
Keywords: Lightspeed C, New Roms, ZoomWindow
Summary: technote #79,zoom rectangle

In article <4319@ut-ngp.UUCP>, jdm@ut-ngp.UUCP (Jim Meiss) writes:
> 
> 	I am a novitiate both to C and to MacIntosh programing, so
> please pardon the question if it turns out to be trivial.
> 
> 	I would like to implement the zoom box on a window using
> Lightspeed C v. 1.02 on a MacPlus. According to Tech Note #57 (the only
> thing I have seen written on the subject) one defines  a window of type 8. This indeed gives the zoombox in the window. Next I used the enclosed code fragment to try to get the zoom.
> 	My window that zooms out okay, but will not zoom in. How come??? Perhaps my problem is in the definition of the functions TrackBox
> and ZoomWindow... 
> 
> 	Another question: Is it possible to set the size that 
> 	the window zooms to?
> 

   Apple Technical note number #79 gives is a short but useful note
about doing zooming. In particular it gives some sample code on how
to handle zooming. It also indicates that the DataHandle part of the
window record contants a pointer to a structure that consists of two 
rectanges (not pointers to rectangles). The first rectangle is the unzoomed
state and the second is the zoomed state. The note is careful to mention
that you should make sure DataHandle is not NIL since that would be the
case on a non-zoomable window (i.e. the user is using the old ROM). 

David Gelphman                  BITNET address: DAVEG@SLACVM
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