Gobject Parent Errors

[snowswept <snowswept mac com>]

All,

I am trying to make a type/widget with a parent of
GTK_TYPE_SCROLLED_WINDOW. Right after g_object_new is called I get these
errors...

(list-widget-test:2318): GLib-GObject-WARNING **: invalid cast from
(NULL) pointer to `GtkRange'

(list-widget-test:2318): Gtk-CRITICAL **: file gtkrange.c: line 438
(gtk_range_get_adjustment): assertion `GTK_IS_RANGE (range)' failed

(list-widget-test:2318): GLib-GObject-WARNING **: invalid cast from
(NULL) pointer to `GtkRange'

(list-widget-test:2318): Gtk-CRITICAL **: file gtkrange.c: line 438
(gtk_range_get_adjustment): assertion `GTK_IS_RANGE (range)' failed

(list-widget-test:2318): GLib-GObject-WARNING **: invalid cast from
(NULL) pointer to `GtkRange'

(list-widget-test:2318): Gtk-CRITICAL **: file gtkrange.c: line 438
(gtk_range_get_adjustment): assertion `GTK_IS_RANGE (range)' failed

Everything works just fine with the type/widget... these errors are just
spit out making it difficult for me to figure out where things are going
wrong. I think I get these because I am some how not initializing the
parent type right. Here are the relevant functions...

GtkType
my_list_widget_get_type (void)
{
        static GtkType my_list_widget_type = 0;

        if (!my_list_widget_type) {
                static const GTypeInfo my_list_widget_info = {
                        sizeof (MyListWidgetClass),
                        NULL,           /* base_init */
                        NULL,           /* base_finalize */
                        (GClassInitFunc) my_list_widget_class_init,
                        NULL,           /* class_finalize */
                        NULL,           /* class_data */
                        sizeof (MyListWidget),
                        0,              /* n_preallocs */
                        (GInstanceInitFunc) my_list_widget_init
                };

                my_list_widget_type = g_type_register_static
(GTK_TYPE_SCROLLED_WINDOW, "MyListWidget",
                                                              &my_list_widget_info, 0);
        }
        
        return my_list_widget_type;
}

static void
my_list_widget_class_init (MyListWidgetClass *class)
{
        GObjectClass   *o_class;
        GtkObjectClass *object_class;
        GtkWidgetClass *widget_class;

        parent_class = g_type_class_peek_parent (class);

        o_class = (GObjectClass *) class;
        object_class = (GtkObjectClass *) class;
        widget_class = (GtkWidgetClass *) class;

        o_class->finalize = my_list_widget_finalize;

        object_class->destroy = my_list_widget_destroy;
        
        /* Signals. */
        signals[LIST_SELECTED] = g_signal_new
                ("my_selected",
                 G_TYPE_FROM_CLASS (class),
                 G_SIGNAL_RUN_LAST,
                 0,
                 NULL, NULL,
                 g_cclosure_marshal_VOID__INT,
                 G_TYPE_NONE, 1, G_TYPE_INT);
}

static void
my_list_widget_init (MyListWidget *list)
{
        GtkCellRenderer *renderer;
        GtkTreeViewColumn *column;

        /* Create the model */
        list->store = gtk_tree_store_new (N_COLUMNS, GDK_TYPE_PIXBUF,
G_TYPE_STRING);

        /* Create the view */
        list->tree_view = gtk_tree_view_new_with_model (GTK_TREE_MODEL
(list->store));

        /* Create a picture column */
        renderer = gtk_cell_renderer_pixbuf_new ( );
        column = gtk_tree_view_column_new_with_attributes ("Picture", renderer,
"pixbuf", PICTURE_COLUMN, NULL);
        gtk_tree_view_append_column (GTK_TREE_VIEW (list->tree_view), column);

        /* Create a text column */
        renderer = gtk_cell_renderer_text_new ( );
        column = gtk_tree_view_column_new_with_attributes ("Author", renderer,
"text", AUTHOR_COLUMN, NULL);
        gtk_tree_view_append_column (GTK_TREE_VIEW (list->tree_view), column);

        gtk_container_add (GTK_CONTAINER (list), GTK_WIDGET(list->tree_view));
        gtk_widget_show(GTK_WIDGET (list->tree_view));
        
        gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (list),
GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
        gtk_widget_show(GTK_WIDGET (list));
}


GtkWidget *
my_list_widget_new (void)
{
        return g_object_new (MY_TYPE_LIST_WIDGET, NULL);
}