Path: utzoo!attcan!utgpu!watmath!att!dptg!rutgers!cs.utexas.edu!uunet!sco!jamesm
From: jamesm@sco.COM (James M. Moore)
Newsgroups: comp.sys.mac.programmer
Subject: List manager and Think C
Message-ID: <5501@viscous.sco.COM>
Date: 30 Aug 89 15:55:26 GMT
Sender: news@sco.COM
Reply-To: jamesm@sco.COM (James M. Moore)
Organization: An tOibriu Santa Cruz
Lines: 38

One question about lists, one comment about the Think object
libraries:

1.  Is there any way to change the location of a list?  There doesn't
seem to be a list manager call to do so.  The kludge that I tried that
didn't work was to directly modify (**listHandle).rView, and then
InvalRect the entire list.  If this isn't possible, how do you clone a
list?  It seems like you could just build a new list that's the same
size as the old, then just set (**newListHandle).cells to point to the
old list's data.  The first problem I see with that is that when you
delete the old list, it expects to be able to delete its data.  I
guess you could set the cells handle to a dummy handle that it could
then delete, but this seems to be moving from the realm of 'hack' into
that of 'kludge.' Anyone have a more elegant way to do this?

2.  The reason the list question comes up is that I'm building a list
class as a subclass of CPane, and I'd like to implement Offset(). My
class is practically done, but I spent a considerable amount of time
working around having the origin reset every time I went into a
drawing routine.  This morning, I realized that I would probably have
been better off if I had started out with a CControl superclass, as I
wouldn't have to deal with any of the Prepare() stuff that CPane does
for you.  Think 4.0 is great fun, even though it doesn't have many of
C++'s features (what I really want are virtual functions*, although
everything else would be nice).  

*virtual functions:  I understand this to mean that you can have a
single function defined multiple times:

	foo(int x);
	foo(long x);

and the function that gets called depends on the arguements that you
pass.  Feel free to correct me if I'm getting the terminology wrong.
-- 
James Moore                            | You will face many tests in life.
Santa Cruz Operation UNIX Tech Support |
jamesm@sco.com                         | This is not one of them.