Re: [Perl-widget-developer] Structure of Widget Base classes

[Gunther B. <gu...@ex...>]

I think this is reasonable.

I Don't know about Widget::Select since it is meant to be an abstract class 
and not actually instantiated itself.  So it's a bit odd. Perhaps

Widget::Base::Select would be better to make it clear that anything under 
Base direectory is an abstract skeleton of widgets that will belong under 
Widget::HTML or Widget::WML or what have you.

At 09:23 PM 6/5/01 +1000, Cees Hek wrote:

>I have a concern with the current structure of the base
>classes.  Currently the way I see it, the structure is as follows
>
>Widget::Base - base class for all widgets
>Widget::HTML::Base - base class for all HTML widgets (inherits Widget::Base)
>Widget::HTML::Select - a widget class (inherits from Widget::HTML::Base)
>
>Now if we add WML we would get the following extra classes
>
>Widget::WML::Base - base class for all HTML widgets (inherits Widget::Base)
>Widget::WML::Select - a widget class (inherits from Widget::HTML::Base)
>
>
>My concern here is that there is no sharing of code between
>Widget::HTML::Select and Widget::WML::Select besides the Widget::Base and
>Widget::HTML::Base.  I think there should be a base class for Select
>widgets that the HTML and WML Select widgets can inherit from.  Otherwise
>we will be duplicating a tonne of code between the different interfaces.
>
>
>Essentially, I think we have our Base class structure backwards.  What we
>need to think about is what similarities and differences there will be
>between the different interfaces.  The only method that should be
>different in a Widget is the method that renders the actual widget.
>Everything else will most likely be the same.
>
>To fit a Widget::Select baseclass into the current structure would require
>multiple inheritance, and I don't know if that is such a good idea.
>
>
>What if we used the following structure:
>
>Widget::Base - base class for all widgets
>Widget::Select - a generic dropdown box widget (inherits from Widget::Base)
>
>Widget::HTML::Base - a base class for HTML widgets (doesn't inherit)
>Widget::HTML::Select - a display class for Select box
>                                 (inherits from Widget::HTML::Base)
>
>The Widget::Select object can instantiate the correct display object from
>one of the interfaces once it knows (from the config file) which interface
>we are displaying to. It can choose to use Widget::HTML::Select or
>Widget::WML::Select depending on the requirements.
>
>
>Does anyone have any other ideas or comments on the implications of this?
>I haven't thought this out completely yet, but I wanted to throw it out
>before we got too deep into the coding.
>
>
>--
>Cees Hek
>
>
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Gunther Birznieks (gun...@eX...)
eXtropia - The Open Web Technology Company
http://www.eXtropia.com/