[maemo-developers] [maemo-developers] Way to get a reference to parent HildonAppView from its menu

[From: Luca Donaggio]

2006/1/20, Luca Donaggio <donaggio at gmail.com>:
>
>
>
> 2006/1/19, Kalle Vahlman <kalle.vahlman at gmail.com>:
> >
> > On 1/19/06, Luca Donaggio <donaggio at gmail.com> wrote:
> > [Finding the AppView from a menu reference]
> > > I'm tryng to port grsync to maemo, it's almost done really, but for
> > this
> > > menu related issue. Grsync has been made with Glade and Glade uses a
> > > lookup_widget() function to retrieve widgets programmatically by their
> > > names.
> >
> > And that's exactly where it fails since it traverses the widget
> > hierarchy which the menu is not a part of. It's own hierarchy looks
> > something like:
> >
> > GtkWindow
> >    \- GtkMenu
> >     \- (multiple GtkMenuItems)
> >
> > Looking at the code, the GtkWindow is the menu's toplevel window (the
> > menu itself derives from GtkMenuShell which is in turn a GtkContainer
> > so it can not be onscreen otherwise) and thus it is in it's own
> > hierarchy.
> >
> > This coupled with the fact that the glade function has no reference to
> > menu hierarchy (as it is created by the AppView) makes it impossible
> > to find with the standard lookup method.
> >
> > From the other mail:
> > >That would not be a big issue, as this app has only one AppView and a
> > simple call
> > >to hildon_app_get_appview() would do the trick, but ... it doesn't
> > work for me! It
> > >seems to return the same value I got before: ie a reference to a
> > GtkWindow
> > > (probably the window in which the app itself is displayed ?) and not a
> > pointer to
> > > the HildonApp object.
> >
> > This sounds a bit strange, since the HildonApp is a GtkWindow (though
> > the type and name should state HildonApp of course) which has multiple
> > HildonAppViews (derives from GtkBin) as it's children (although it
> > only shows one at a time).
> >
> > --
> > Kalle Vahlman, zuh at iki.fi
> > Powered by http://movial.fi
> > Interesting stuff at http://syslog.movial.fi
> >
>
>
> I  understand. So the GtkWindow, which is the top level widget of an
> HildonAppView's own menu, is not in any way referrable to the HildonApp to
> which that HildonAppView is attached?
> If this is the case, I don't see any other way to solve the problem apart
> from maintaining a global reference for the HildonApp and modifying the
> glade lookup function to get the right pointer to the HildonAppView through
> that reference directly, without traversing one object's hierarchy anymore.
>
> Luca Donaggio
>

Ok, i finally managed to solve this issue, next week I'm planning to have
the packaging work finished too and to release an hildonized version of
grsync for all you rsync-lovers !

For those interested (if any ;-)):

-first I had to manually add a reference to the HildonAppView to its GtkMenu
context:

[code]
GLADE_HOOKUP_OBJECT_NO_REF (GTK_WIDGET (menu1), main, "main");

[/end code]

- secondly, this is the working modified version of the original glade
function lookup_widget():

[code]
GtkWidget*
lookup_widget                          (GtkWidget       *widget,
                                        const gchar     *widget_name)
{
  GtkWidget *parent, *found_widget;

  for (;;)
    {
      if (GTK_IS_MENU (widget)) {
        parent = (GtkWidget*) g_object_get_data (G_OBJECT (widget), "main");
      } else if (HILDON_IS_APPVIEW (widget))
        break;
      else
        parent = widget->parent;
      if (!parent)
        parent = (GtkWidget*) g_object_get_data (G_OBJECT (widget),
"GladeParentKey");
      if (parent == NULL)
        break;
      widget = parent;
    }

  found_widget = (GtkWidget*) g_object_get_data (G_OBJECT (widget),
                                                 widget_name);
  if (!found_widget)
    g_warning ("Widget not found: %s", widget_name);
  return found_widget;
}
[/end code]

Thanks Fred and Kalle for all your helpful suggestions!

Luca Donaggio.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.maemo.org/pipermail/maemo-developers/attachments/20060120/409826ee/attachment.htm