inherited_widget_rebuild_test.dart

import 'package:flutter/material.dart';

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(
    CounterScope(
      notifier: CounterNotifier(),
      child: MyApp(),
    ),
  );
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Home(),
    );
  }
}

class Home extends StatelessWidget {
  const Home({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    print("HOME BUILD");
    return Scaffold(
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            Navigator.of(context).push(
              MaterialPageRoute(builder: (context) => Page1()),
            );
          },
          child: Text('GO TO NEXT BUTTON'),
        ),
      ),
    );
  }
}

class Page1 extends StatelessWidget {
  const Page1({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final counter = CounterNotifier.of(context);
    return Scaffold(
      body: Center(
          child: Text(
              'You have pressed the button this many times: ${counter.value}')),
      floatingActionButton: FloatingActionButton(
        onPressed: () => counter.value++,
        child: Icon(Icons.add),
      ),
    );
  }
}

class CounterNotifier extends ValueNotifier<int> {
  CounterNotifier() : super(0);
  static CounterNotifier of(BuildContext context) =>
      context.dependOnInheritedWidgetOfExactType<CounterScope>()!.notifier!;
}

class CounterScope extends InheritedNotifier<CounterNotifier> {
  CounterScope({
    Key? key,
    required Widget child,
    required CounterNotifier notifier,
  }) : super(key: key, child: child, notifier: notifier);
}