Re: [gtkmm] Feature Wish: ad-hoc or external properties for simplified data binding

["Timothy M. Shead" <tshead k-3d com>]

Christer Palm wrote:

> Andreas Pokorny wrote:
>
> > After initializing the property, the widget and connecting both,the
> > system keeps in synch on its own. And you still can react on signals or
> > do your own processing.
> >
> > So I guess, I will try to get a simple Gui library working that
> > implements that idea. 
>
>
> You should find it rather easy to derive a set of widgets that have this 
> kind of functionality. I've used that technique very successfully, 
> although in my case, my widgets "plugs" into an existing property model 
> rather than beeing generic.
>
> I think the hard part of what you are proposing is to make something 
> that is generic enough to meet everyones needs. There are numerous 
> reasons as to why you'd typically need some logic in between the view 
> and the application model.

I second this - we have an extremely elaborate system for creating data
sources in K-3D that uses policy-based design to handle automatic change
notification, enforce constraints, etc.  Our UI layer is built on top of
it using gtkmm-derivatives.  As is the case with any framework, it works
well for our purposes, but it imposes a significant price in terms of
infrastructure and learning-curve.  Better that gtkmm remain focused on
UI, and let developers handle their domain-specific connection between
view and model.

Cheers,
Tim