Virtualvfunc_This is called to update the activatable completely, this is called internally when the Gtk.Activatable.related_action property is set or unset and by the implementing class when Gtk.Activatable.use_action_appearance changes.
the related Gtk.Action or null
Virtualvfunc_Called to update the activatable when its related action’s properties change. You must check the Gtk.Activatable.use_action_appearance property only apply action properties that are meant to effect the appearance accordingly.
Interface for implementing Activatable. Contains only the virtual methods that need to be implemented.