updated method
- @override
 
override
    Calls Element.didChangeDependencies of all dependent elements, if InheritedWidget.updateShouldNotify returns true.
Called by update, immediately prior to build.
Calls notifyClients to actually trigger the notifications.
Implementation
@override
void updated(InheritedWidget oldWidget) {
  if (widget.updateShouldNotify(oldWidget))
    super.updated(oldWidget);
}