Define the factory used to create all the items.
Since 1.23
@property factory { get {} set {} values { factory: Efl.Ui.Factory; } }
Efl_Ui_Factory *efl_ui_collection_view_factory_get(const Eo *obj); void efl_ui_collection_view_factory_set(Eo *obj, Efl_Ui_Factory *factory);