subclassing a scrolled_window

[paolo borelli <pborelli katamail com>]

Hi!

I'm making a widget which is tree view wrapped into a scrolled window,
something like:

typedef struct _MyView  MyView;
struct _MyView
{
        GtkScrolledWindow scrolled_window; 

        GtkTreeStore *model; /* The model */
        GtkWidget *tree_view; /* The view */

        /* other things ... */
}


Then I have my instance init functions which is something like:

static void
my_view_init (GladeProjectView *view)
{
        GtkTreeViewColumn *column;
        GtkCellRenderer *renderer;
        GtkTreeSelection *selection;

        view->model = gtk_tree_store_new (N_COLUMNS, GTK_TYPE_POINTER);
        glade_project_view_populate_model (view->model, view);

        view->tree_view = gtk_tree_view_new_with_model (GTK_TREE_MODEL
(view->model));

        /* the view now holds a reference, we can get rid of our own */
        g_object_unref (G_OBJECT (view->model));

        renderer = gtk_cell_renderer_text_new ();
        column = gtk_tree_view_column_new_with_attributes (_("Widget"),
renderer, NULL);
        gtk_tree_view_column_set_cell_data_func (column, renderer,
glade_project_view_cell_function, NULL, NULL);
        gtk_tree_view_append_column (GTK_TREE_VIEW (view->tree_view), column);
}

And finally my my_view_new function which is:

GladeProjectView *
my_view_new (GladeProjectViewType type)
{
        GladeProjectView *view = g_object_new (MY_TYPE_VIEW, NULL);

        gtk_container_add (GTK_CONTAINER (view), view->tree_view);

        return view;
}


This way everything works fine.

What I don't understand is why if I move the gtk_container_add() from
my_view_new() to the end of my_view_init() I get 3 assertions of this
kind:

Gtk-CRITICAL **: file gtkrange.c: line 446 (gtk_range_get_adjustment):
assertion `GTK_IS_RANGE (range)' failed


ciao
        paolo