Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!ucbvax!ucdavis!iris!lim
From: lim@iris.ucdavis.edu (Lloyd Lim)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Maintaining scroll bars for multiple windows.
Summary: a simple way
Message-ID: <6544@ucdavis.ucdavis.edu>
Date: 24 Jan 90 10:54:06 GMT
References: <1990Jan23.190524.3693@deimos.cis.ksu.edu>
Sender: uucp@ucdavis.ucdavis.edu
Reply-To: lim@iris.ucdavis.edu (Lloyd Lim)
Distribution: usa
Organization: U.C. Davis - Department of Electrical Engineering and Computer Science
Lines: 24

In article <1990Jan23.190524.3693@deimos.cis.ksu.edu> jxf@phobos.cis.ksu.edu (Jerry Frain) writes:
>I originally thought that I could traverse the list of controls that 
>are attached to the controlList of the WindowRecord, but I can't see
>an easy way to identify which controls are scroll bars (once I do that,
>I would look at the contrlRect to determine right or bottom scroll bar).

Most programmers and object-oriented systems store and handle to some kind of
data structure in the window's refCon.  This is appropriate for complex
applications.

In my simpler programs I use a simpler method of identifying scrollbars.  I
store constants in the control refCons when they are created which let me
identify horizontal and vertical scrollbars when going through the controlList.

Actually, most of the time my applications are simple enough that I only have
the scrollbars in the controlList and I can identify them by position in the
controlList (ie - the first is the horizontal, the next is the vertical).  I
still need constants in the control refCons though in order to identify
scrollbars in a scrollbar actionProc in a generic manner.

+++
Lloyd Lim     Internet: lim@iris.ucdavis.edu (128.120.57.20)
              Compuserve: 72647,660
              US Mail: 146 Lysle Leach Hall, U.C. Davis, Davis, CA 95616