Re: gtkentry subclass

[Adrian Feiguin <feiguin magnet fsu edu>]

Hi Padraig,
Let me see: You overload part of the atk class methods in: 

static void
gail_window_class_init (GailWindowClass *klass)
{
  GailWidgetClass *widget_class;
  AtkObjectClass  *class = ATK_OBJECT_CLASS (klass);

  class->get_name = gail_window_get_name;
  class->get_parent = gail_window_get_parent;
  class->get_index_in_parent = gail_window_get_index_in_parent;
  class->ref_state_set = gail_window_ref_state_set;
  class->initialize = gail_window_real_initialize;

but you also initialize some in the function:

static void
atk_component_interface_init (AtkComponentIface *iface)
{
  g_return_if_fail (iface != NULL);

  iface->get_extents = gail_window_get_extents;
  iface->get_size = gail_window_get_size;
}

Can you tell me the difference? I guess the first overload the previous
interface. What's the difference between the parent class interface, and
the child class interface? Thanks a lot!
<ADRIAN>

On Wed, 29 May 2002, Padraig O'Briain wrote:

> Adrain,
> 
> I wanted to do a similar thing in gail.
> 
> I have a GailWidget class which implements AtkComponent interface and a  
> GailWindow class which derives from GailWidget. I wanted to provide a different 
> implementation in GailWindow for a couple of AtkComponent methods. 
> 
> Hopefully, the code in gail/gail/gailwindow.c will show you how I did it.
> 
> Padraig
> 
> > 
> > I'm trying to create a gtkentry subclass that would allow to justify the
> > text (left/right--for numbers/centered). Everything would be much easier
> > if I could just simply overload the "adjust_scroll" function (if it were
> > part of the class methods). Instead, I have to practivally copy all the
> > gtkentry code and overload the gtkeditable interface. However I don't
> > understand the new strategy of adding interfaces:
> > 
> >       static const GInterfaceInfo editable_info =
> >        {
> >          (GInterfaceInitFunc) gtk_entry_editable_init,    /*
> > interface_init */
> >          NULL,                                            /*
> > interface_finalize */
> >          NULL                                             /*
> > interface_data */
> >        };
> >  
> >        g_type_add_interface_static (entry_type,
> >                                     GTK_TYPE_EDITABLE,
> >                                     &editable_info);
> > 
> > I want to overload the methods:
> > 
> >  static void
> >  gtk_entry_editable_init (GtkEditableClass *iface)
> >  {
> >    iface->do_insert_text = gtk_entry_insert_text; 
> >    iface->do_delete_text = gtk_entry_delete_text;
> >    iface->insert_text = gtk_entry_real_insert_text;
> >    iface->delete_text = gtk_entry_real_delete_text;
> >    iface->get_chars = gtk_entry_get_chars;
> >    iface->set_selection_bounds = gtk_entry_set_selection_bounds;
> >    iface->get_selection_bounds = gtk_entry_get_selection_bounds;
> >    iface->set_position = gtk_entry_real_set_position;
> >    iface->get_position = gtk_entry_get_position;
> >  }
> > 
> > When I just copy and paste (and rename) the code from gtkentry, it keeps
> > calling the original gtkentry functions before calling the new ones. Any
> > hits? Thanks a lot!
> > <ADRIAN>
> > 
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> 
>