Re: g_object_class_install_property

["Daniel Espinosa" <esodan gmail com>]

For an example of how to create GObjects (all GktWidgets are derived from
it), you can check the code in CVS for diferent objects in Gnome-DB in:

http://cvs.gnome.org/viewcvs/libgnomedb/libgnomedb/

Gnome-Db defines a lot of new Widgets to manipulate data from Data Bases,
then I think is a good example. Review the GObject documentation.

You mus have a your_widget_class_init function with this:

/* Properties */
       object_class->set_property = gnome_db_grid_set_property;
       object_class->get_property = gnome_db_grid_get_property;
   g_object_class_install_property (object_class, PROP_RAW_GRID,
                                        g_param_spec_object ("raw_grid",
NULL, NULL,
                                 GNOME_DB_TYPE_RAW_GRID,
                                 G_PARAM_READABLE));
   g_object_class_install_property (object_class, PROP_INFO,
                                        g_param_spec_object ("widget_info",
NULL, NULL,
                                 GNOME_DB_TYPE_DATA_WIDGET_INFO,
                                 G_PARAM_READABLE));


2006/8/23, Tristan Van Berkom <tvb gnome org>:
> Madhusudan E wrote:
> > Hi,
> > The property wasn't defined on the object, But it started working when I
> > defined the first_property in g_object_new().
> >
> > I have a query here,
> > Doesn't the gobject_class->set_property function be invoked without
> sending
> > the first_property parameter in g_object_new().
> > If not then somewhere it needs to documented.
> >
>
> I dont understand your question really,
>    - g_object_new() creates an object with the specified properties
>      (if any properties are specified - otherwise they are assumed to be
>      the defaults that you specified in the GParamSpec)
>    - You can later set these properties using g_object_set()
>    - If you cant set a property using g_object_set() later on - then you
>      probably didnt give it G_PARAM_WRITABLE permissions or you called it
>      G_PARAM_CONSTRUCT_ONLY.
>
> Cheers,
>                 -Tristan
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