Re: [pygtk] GTK_IS_WIDGET on subclass of a widget fails

[Jeffrey Finkelstein]

Kelvin Ho wrote:
> Have a look at this:
> 
> http://fuhm.net/super-harmful/
> 
> ;)
> 

Interesting...so what can _I_ do then? This seems like a problem above me...
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Re: [pygtk] GTK_IS_WIDGET on subclass of a widget fails

[Jeffrey Finkelstein]

Christian Becke wrote:
> 
> I think you have to call the constructor of the parent object here:
>   def __init__(self):
>   HBox.__init__(self)
> and you have to make your new widget known:
> import gobject
> gobject.type_register (FooBox)
> 

Thanks Christian, and Jeffrey, that helped.

Jeffrey
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[pygtk] GTK_IS_WIDGET on subclass of a widget fails

[Jeffrey Finkelstein]

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

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?

Thanks.
Jeffrey
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