Re: g_object_ref and g_object_unref in widget implementations

[Bastiaan Veelo <bastiaan sarc nl>]

Tristan Van Berkom wrote:
> On Sat, 2007-10-06 at 13:09 +0200, Bastiaan Veelo wrote:
>   
> > Hi,
> >
> > I am writing my own widget, and while looking at the widgets in GTK I 
> > notice the following.
> >
> > If a widget draws on its parent GdkWindow, you generally see
> >
> >     
> > > widget->window = gtk_widget_get_parent_window (widget);
> > > g_object_ref (widget->window);
> > >       
> > But widget->window is not g_object_unref-ed anywhere in the widget 
> > implementation. Why shouldn't it?
> >     
>
> They are unreffed, it just takes a little while getting used to
> reading the object oriented C code :)
>
> Notice:
>   gtkbutton.c::realize() does what you say, get_parent_window(),g_object_ref().
>
>   gtkbutton.c::unrealize() does some gtkbutton specific things, and chains up
>   to the parent implementation with:
>     GTK_WIDGET_CLASS (gtk_button_parent_class)->unrealize (widget);
>
>   gtkwidget.c::unrealize() is the implementation that it will fallback
>   on, thats where widget->window will be unreffed if GTK_WIDGET_NO_WINDOW(widget).
>
> Cheers,
>                  -Tristan
>
>   


Ah, thanks.
Bastiaan.