Re: Project Scheduling Design

[Federico Mena Quintero <federico nuclecu unam mx>]

>  I'd like to start developing a Gnome project scheduling application, as
>  listed in the Rhad TODO list at http://www.labs.redhat.com/schedule.shtml

Cool!

>    1) Derive the whole thing from a Canvas widget.  This would be the
>       most versatile approach, but seems to require reimplimenting most
>       of the Scrollbar and Clist widgets in terms of a Canvas.  I don't
>       see any way to get much reuse of existing components other than
>       by cut-and-paste (ugh!).
>  
>    2) Use an Hpane widget as a container for a Clist widget on the left
>       and a Canvas widget on the right.  This would be great from a
>       software reuse perspective, but seems to require concocting some
>       way to get the vertical scrollbar of the canvas widget to control
>       the Clist and Canvas widgets in the two panes of the window.  I
>       don't see any way to do this.
>  
>  I'd appreciate any advise on the relative merits of these two
>  approaches, or suggestions for alternate implementation strategies.

For the first strategy, you would have to reimplement clist for the
canvas.  I would only do this if you need something exotic out of the
clist that it can really not do right now.  You don't need to
reimplement the scrollbar.

I would go for the second approach.  The canvas does not have
scrollbars; it just has a pair of adjustments that you can tweak, and
of course attach to your own scrollbars.  You could potentially share
your own vertical adjustment between the clist and the canvas.

  Federico