Tristan Van Berkom wrote: > On Dec 23, 2007 1:20 AM, Alwin Leerling <leerling@xxxxxxxxxx > <mailto:leerling@xxxxxxxxxx>> 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 ? > This application is purely the gui part of my system. I have another application that does the actual work, so my gui is totally stateless. To my knowledge is it advantageous to give the ownership to the view widget as I don't have to keep variables laying around. If I need something like the store I can always request it from GTK. > Will you be having multiple list stores that you might want to keep > around and alternate the view ? > No, I initialise the stores on startup and just add/remove items from them. > 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. > Does this mean that I have to unref the store as soon as I have assigned it to the combo (gtk_combo_box_set_model) ? > > 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 > I read that but it was not clear to me which GTK calls add references and which are not. In my code I never add a reference explicitly but I have no idea what the GTK library does. I am heartened by your comment that if a GTK library call adds a reference, it is noted in the documentation. > Cheers, > -Tristan > Thanks for your help. Alwin _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
