On Dec 23, 2007 1:20 AM, Alwin Leerling <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I'm slightly overwhelmed as to the whole reference counting issue. Could
> someone explain the though process or logic behind the reference
> counting or direct me to some information where I can find the correct
> use. For example, in my code I set up my combo boxes on startup using
> gtk_list_store_newv and gtk_combo_box_set_model. (Do I need to unref the
> list_store pointer at this stage?)
This is a question of how you interpret your application, think, do you
want to give the ownership of your data model to your view widget ?
Will you be having multiple list stores that you might want to keep
around and alternate the view ?
If you unref your list store (passing ownership to the combo box), then
destroying (freeing) the combo box will take care of finalizing (freeing)
the list store.
> At a later stage I am ready to put
> some data in the combo box, so I get the store (with
> gtk_combo_box_get_model) and add some entries to the sore. Do I need to
> unref the aquired pointer?
No. in general gtk_[widget]_get_[parameter]() functions never duplicate
strings or add references (strings are easier because they are always
const return values if they are not duplicated).
Usually a returned value that has a reference will note in the docs that
it must be unreffed (strings from g_object_get() are dupped and objects
refcount incremented for instance).
To make matters more confusing, I also have a
> couple of combo's with filters. I wrote a little stub to acquire the
> store:
>
> GtkTreeModel * gtk_combo_get_filter_model( GktComboBox * combo )
> {
> return gtk_tree_model_filter_get_model( GTK_TREE_MODEL_FILTER(
> gtk_combo_box_get_model( combo ) ) );
> }
>
> Do I leak a reference here?
No.
Also read the description portion of:
http://library.gnome.org/devel/gtk/unstable/GtkObject.html
Cheers,
-Tristan
_______________________________________________
gtk-list mailing list
[email protected]
http://mail.gnome.org/mailman/listinfo/gtk-list
