fully qualify object name, for example GtkObject::user_data.
type of the argument.
bitwise-OR of the GtkArgFlags enum. (Whether the argument is settable or gettable, whether it is set when the object is constructed.)
an internal number, passed in from here to the "set_arg" and "get_arg" handlers of the object.
Warning gtk_object_add_arg_type is deprecated and should not be used in newly-written code. Deprecated in favor of the GObject property system including GParamSpec. Add a new type of argument to an object class. Usually this is called when registering a new type of object.