main_5_dark_mode.dart

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, this.themeMode, this.onThemeMode})
      : super(key: key);

  final ThemeMode? themeMode; //
  final ValueChanged<ThemeMode>? onThemeMode; //

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Title"),
      ), // This trailing comma makes auto-formatting nicer for build methods.
      drawer: CustomDrawer(
        themeMode: widget.themeMode,
        onThemeMode: (ThemeMode value) {
          widget.onThemeMode?.call(value);
        },
      ),
    );
  }
}