location to store the focus chain of the container, or %NULL. You should free this list using g_list_free() when you are done with it, however no additional reference count is added to the individual widgets in the focus chain.
%TRUE if the focus chain of the container has been set explicitly.
Deprecated: For overriding focus behavior, use the GtkWidgetClass::focus signal.
Retrieves the focus chain of the container, if one has been set explicitly. If no focus chain has been explicitly set, GTK+ computes the focus chain based on the positions of the children. In that case, GTK+ stores %NULL in @focusable_widgets and returns %FALSE.