RE: [Plib-devel] On First Looking Into Baker's SSG (with apologie s to John Keats)

[Fay J. F C. AAC/W. <joh...@eg...>]

We will need puValue functionality in every non-group widget, and possibly
in group widgets as well.  I'll have to go look at the PUI compound widgets
again.

It has been a while since I looked at compound widgets, but I think I made
them inherit from "puGroup" because if I didn't, there would be confusion
over things like traversing them and deleting them in the widget tree.  Each
PUI widget is automatically added to its parent "puGroup" widget's "dlist"
at creation, and if I have a compound widget that contains other widgets
then the subwidgets are added to the parent (compound) widget's parent group
widget's dlist.  There are ways around it, but I either need guidance or
need to do some thinking.

Regarding multiple inheritance, what do we do in a case where two widgets
are in some ways quite similar but in other ways quite different?  For
example, the "puInput" and the "puLargeInput" have a lot of input functions
in common.  I put them into a common "puInputBase" class and had the
"puInput" and "puLargeInput" use multiple inheritance.  Is there a better
way?

John F. Fay
joh...@eg...



-----Original Message-----
From: pli...@li...
[mailto:pli...@li...]On Behalf Of Steve Baker
Sent: Monday, August 09, 2004 7:28 PM
To: pli...@li...
Subject: Re: [Plib-devel] On First Looking Into Baker's SSG (with
apologies to John Keats)


Fay John F Contr AAC/WMG wrote:

<snip>

> Under the heading of real issues:
> (11) How would we implement the "puValue" functionality in SSG?  Should 
> we just add it to "ssgBase" or should it remain separate?  If the 
> latter, should we use multiple inheritance in the SSG widgets?

I dislike multiple inheritance - it causes no end of problems in complex
inheritance trees - so let's not do *that*.

Do we need puValue functionality in every node?   Seems to me that it's
really only needed in leaf nodes - so I'd probably think in terms of
creating a derived class of ssgLeaf.

<snip>
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