Le vendredi 28 janvier 2005 Ã 15:22 -0800, Ben Johnson a Ãcrit :
> I want to understand how interfaces are defined and used/implemented.
> The docs say, for instance:
>
> "GtkButton implements AtkImplementorIface"
>
> Is AtkImplementorIface a real thing? How does the GtkButton implement
> it? I haven't been able to find docs about this. Can someone point me
> in the right direction? Are interfaces often or ever defined by GTK+
> users like me?
It's a GInterface object. When creating a new class of object, you
derive it from an existing class and you can add one or several
interfaces to enrich your class.
Here is a sample code I used to add printing support to the gnome canvas
(this code is used by GChemPaint).
GType
gnome_canvas_group_ext_get_type (void)
{
static GType group_ext_type;
if (!group_ext_type) {
static const GTypeInfo object_info = {
sizeof (GnomeCanvasGroupExtClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gnome_canvas_group_ext_class_init,
(GClassFinalizeFunc) NULL,
NULL, /* class_data */
sizeof (GnomeCanvasGroupExt),
0, /* n_preallocs */
(GInstanceInitFunc) gnome_canvas_group_ext_init,
NULL /* value_table */
};
static const GInterfaceInfo print_info = {
(GInterfaceInitFunc) gnome_canvas_group_print_init,
NULL, NULL
};
group_ext_type = g_type_register_static (GNOME_TYPE_CANVAS_GROUP_EXT,
"GnomeCanvasGroupExt",
&object_info, 0);
g_type_add_interface_static (group_ext_type, G_TYPE_PRINTABLE,
&print_info);
}
return group_ext_type;
}
Hope this helps,
Best regards,
Jean
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