navigator is inherited widget which is placed in code example

Example: flutter inhereted widget

class MyInherited extends InheritedWidget {
  const MyInherited({
    Key key,
     Widget child,
  }) : super(key: key, child: child);


  static MyInherited of(BuildContext context) {
    return context.dependOnInheritedWidgetOfExactType<MyInherited>();
  }

  //if you have properties, it should look something like:
  // bool updateShouldNotify(MyInherited old) => old.prop !== new.prop;
  
  //if you don't: 
  
  bool updateShouldNotify(MyInherited old) => false;
  
}

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Dart Example