Re: RcStyle::set_bg_pixmap_name() working only for some classes

["Matt Hoosier" <matt hoosier gmail com>]

On 10/18/06, Murray Cumming <murrayc murrayc com> wrote:
> On Tue, 2006-10-17 at 15:26 -0500, Matt Hoosier wrote:
> > I'd like to install a pixmap (not known until runtime) as the
> > background image for a widget.
> >
> > Using a custom RcStyle with the "bg_pixmap" property set seems like it
> > ought to do the chore:
> >
> >   Gtk::Widget w = ...;
> >   const Glib::RefPtr<Gtk::RcStyle> style = Gtk::RcStyle::create ();
> >   style->set_bg_pixmap_name (Gtk::STATE_NORMAL, "/path/to/image.png");
> >   w.modify_style (style);
> >
> > This only seems to work for those classes (and not their derived
> > classes) which are not GTK_WIDGET_NO_WINDOW. That is, it works for
> > Gtk::DrawingArea, Gtk::EventBox, and a couple of others.
> >
> > If I try to instantiate "w" above as an instance of the following class:
> >
> >     class DerivedEventBox : public Gtk::EventBox
> >     {
> >         public:
> >             DerivedEventBox () : Gtk::EventBox () {}
> >             virtual ~DerivedEventBox() {}
> >     };
> >
> > the background PNG does not appear. Yet if I do a trivial
> > GObject-based subclass of GtkEventBox and use the result of
> > Glib::wrap() as the value of "w" above, the pixmap appears [as
> > expected?].
> >
> > Is there some subtlety to the way that the GType inheritance works in
> > parallel with the C++ inheritance?
>
> I wonder whether this bug is causing it:
> http://bugzilla.gnome.org/show_bug.cgi?id=343012
>
> Can you try the GTK+ patch to rule that out?

As it happens, I already apply that patch on my Gtk+ build.

> --
> Murray Cumming
> murrayc murrayc com
> www.murrayc.com
> www.openismus.com