[pygtk] GTK_IS_WIDGET on subclass of a widget fails

[Kelvin Ho]

Have a look at this:

http://fuhm.net/super-harmful/

;)

On Fri, May 22, 2009 at 3:21 PM, Neil Dugan
<pygtk at butterflystitches.com.au>wrote:

> Christian Becke wrote:
> > Jeffrey Finkelstein schrieb:
> >> I'm new to Gtk. I tried to create a subclass of an HBox and add it to a
> >> window, but I get a GtkWarning telling me that the assertion
> >> `GTK_IS_WIDGET()' fails on the instance of my subclass.
> >>
> >> For example:
> >>
> >> ===code===
> >>
> >> from gtk import Window, HBox, WINDOW_TOPLEVEL, main
> >>
> >> class FooBox(HBox):
> >>      def __init__(self): pass
> >
> > I think you have to call the constructor of the parent object here:
> >       def __init__(self):
> >               HBox.__init__(self)
>
> wouldn't it be better to use
> super(FooBox,self).__init__()
>
> > and you have to make your new widget known:
> > import gobject
> > gobject.type_register (FooBox)
> >
> >> window = Window(WINDOW_TOPLEVEL)
> >> window.add(FooBox())
> >> window.show_all()
> >> main()
> >>
> >> ===/code===
> >>
> >> yields a warning at "window.add()", namely "GtkWarning:
> >> gtk_container_add: assertion `GTK_IS_WIDGET (widget)' failed". This
> >> causes the widget to not be displayed in the window.
> >>
> >> I don't really understand why this is; am I missing a method call?
> >
> > Have a look at the gobject tutorial [1].
> >
> > HTH,
> >
> > Chris
> >
> > [1]
> >
> http://www.sicem.biz/personal/lgs/docs/gobject-python/gobject-tutorial.html
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> >
>
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