issues_111831

main.dart

import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';

void main() => runApp(const MyApp());

final _router = GoRouter(
  routes: <GoRoute>[
    GoRoute(
      path: '/',
      builder: (context, _) =>
          const MyHomePage(title: 'Flutter Demo Home Page'),
      routes: [
        GoRoute(
          path: 'other_route',
          builder: (context, _) => Scaffold(
            appBar: AppBar(),
            body: const Center(child: Text('other_route')),
          ),
        ),
      ],
    ),
  ],
);

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    debugPrint('building MyApp');
    return MaterialApp.router(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      routeInformationProvider: _router.routeInformationProvider,
      routeInformationParser: _router.routeInformationParser,
      routerDelegate: _router.routerDelegate,
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  late final ValueNotifier<int> _counter;

  @override
  void initState() {
    _counter = ValueNotifier(0);
    super.initState();
  }

  @override
  void dispose() {
    _counter.dispose();
    super.dispose();
  }

  @override
  Widget build(context) {
    debugPrint('building MyHomePage');
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            ValueListenableBuilder<int>(
              valueListenable: _counter,
              builder: (context, counter, _) => Text(
                '$counter',
                style: Theme.of(context).textTheme.headline4,
              ),
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          _counter.value++;
          context.go('/other_route');
        },
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}