Re: Custom widget headache

[David Nečas (Yeti) <yeti physics muni cz>]

On Wed, May 31, 2006 at 04:15:38PM +0200, Daniel Haude wrote:
> Hello folks,
>
> I'm trying to build a custom widget, following the route that is outlined  
> for the "GtkDial" widget in the GTK+ tutorial. I'm already stuck at the  
> very beginning -- type registration. My widget is called "cw_area", and I  
> followed the usual naming conventions

Well, not exactly.  Structs of MyFoo are normally called
_MyFoo, not MyFoo_t, the same for classes: MyFooClass and
struct _MyFooClass.

> ...
>
> GtkType cw_area_get_type()
> {
>       static GtkType area_type = 0;
>
> ENTER
>       if (!area_type) {
>               static const GtkTypeInfo area_info = {
>                       "CwArea",
>                       sizeof (CwArea),
>                       sizeof (CwAreaClass),
>                       (GtkClassInitFunc) cw_area_class_init,
>                       (GtkObjectInitFunc) cw_area_init,
>                       /* reserved_1 */ NULL,
>                       /* reserved_1 */ NULL,
>                       (GtkClassInitFunc) NULL
>               };
>
>               area_type = gtk_type_unique(GTK_TYPE_WIDGET, &area_info);
>       }
> EXIT
>       return area_type;
> }

If the Gtk+ tutorial

  http://www.gtk.org/tutorial/

mentions GtkType, GtkTypeInfo or gtk_type_unique() anywhere,
it should be immediately fixed.

I don't know what exactly happens if one tries to use the
old Gtk+ 1.x type functions together with GObject, but
screwup is a likely possibility.

Please ditch the Gtk+ tutorial which told you to use the
GtkType stuff and rewrite the code to use GObject accodring
to The Real Gtk+ Tutorial.

Yeti


--
Anonyms eat their boogers.