Re: GtkBuildable type resolver

[Johan Dahlin <johan gnome org>]

Murray Cumming wrote:
> On Tue, 2007-06-05 at 11:02 +0200, Andy Wingo wrote:
>> Hi Tristan,
>>
>> On Mon, 2007-06-04 at 15:32 -0400, Tristan Van Berkom wrote:
>>> One thing that might or might not be a can of worms is
>>> language bindings. I wonder if someone more experienced
>>> than myself in this realm could point out how we plan
>>> to load widgets written in other languages from the GtkBuilder
>>> perspective, namely how will we obtain the runtime GType of
>>> the object from its name in the xml/glade file.
>> I think that most language bindings do special things to register GTypes
>> when classes are defined, instead of using get_type() functions. If,
>> instead, a binding actually uses get_type() functions, they can register
>> those functions with GTK+; otherwise, you would have to resort to
>> libffi's callbacks. But in this case, I'd go ahead assuming that
>> language bindings are fine. Also since Johan is in this, I'm sure he
>> would speak up if there were a problem :)
> 
> GladeXml has a lookup_type() vfunc for this, which I added (I think) so
> that we could instantiate gtkmm GTypes rather than GTK+ GTypes. This
> allows GladeXml to delegate the decision to the language binding, which
> can override that vfunc.
> 

Is that vfunc still necessary, I'd like, if possible to avoid adding this
method to the GtkBuilder API, but I can add one if there's no other
practical way of solving that problem in gtkmm.

Johan