[Glade-devel] Property Binding: Fixing the big blocker

[denisw at online.de (Denis Washington)]

Am 22.11.2011 07:18, schrieb Denis Washington:
> > The other detail about the 'clear property' or 'invalidate property' semantics
> > is not entirely clear to me, I suppose one approach would be to fire a signal
> > on a GladeProperty when it is supposed to be cleared.
> >
> > For instance...
> >
> >     o the activatable editor goes ahead and clears
> >        a property which is actually a binding source (somewhere inside
> >        the command group which it declares)... possibly by calling
> >            glade_property_clear (property, use_command = TRUE);
> >
> >     o Then the "clear" or "invalidate" signal is fired on the said GladeProperty
> >        with a 'use-command' parameter as TRUE
> >
> >     o GladeProperty code would implicitly connect to the "invalidate" signal
> >        on it's set 'source property', when the property is cleared then the source
> >        property attribute can be unset undoably
> >
> >     o Some specific GladeWidgets will be allowed to connect to an "invalidate"
> >        signal on a property of another GladeWidget, if ever more code is developed
> >        which needs to do an action at property invalidation time, this can be done
> >        by listening to this signal and without adding custom code to
> > glade-command.c
>
> This sounds like a sensible approach (although I would really call it
> glade_property_invalidate(), as this makes the intention and the
> difference to "resetting" a property clearer). I could go ahead and
> implement this and see how it works out.

Hi, I wanted to say that I just pulled 
glade_command_set_property_sensitive() out of the branch and just left 
GladeWidgetAdaptor::evaluate_property_sensitivity() there. Consequently, 
the branch is now named "evaluate-sensitivity".

I added a call to evaluate_property_sensitivity() to 
glade_property_set_value_impl(), and for the case that I ported so far 
(GtkEntry), this works perfectly.

As there is no need for it outside of the gbinding branch, I'll add 
glade_property_invalidate() to that branch directly. I guess I'll also 
rebase gbinding to the evaluate-property branch to make testing easier.

Regards,
Denis