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.
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
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