Re: [gtk-list] viewport / scrolledwindow simple question.
- From: Owen Taylor <owt1 cornell edu>
- To: gtk-list redhat com
- Subject: Re: [gtk-list] viewport / scrolledwindow simple question.
- Date: 30 Nov 1997 18:46:38 -0500
Patrice Fortier <Patrice.Fortier@aquarel.fr> writes:
> Looking at ian's tutorial I found that viewport and scrolledwindow
> are 2 different widgets.
> I would say that scrolledwindow is a subclass of the viewport...
> Why isn't it the case? (wow doesn't look very english :)).
I would say, subclassing expresses an "ISA" relationship.
A scrolledwindow isn't a viewport, it is a combination
of a viewport and a scrollbar.
The opposite point of view could probably be argued, but I think
the relevant question is "why would it be better to make
it a subclass?"
In any case, you'd have more code duplication with the subclassing
solution, since you couldn't reuse the code that does the
size negotiation / layout.
Regards,
Owen
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