Flutter navigation with then

main.dart

import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: LoginScreen(),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: const Center(
        child: Text('Home Screen'),
      ),
    );
  }
}

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

  Future<bool> login() async {
    print('Login...');
    await Future.delayed(const Duration(seconds: 1));
    return true;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          login().then((result) {
            print('Login result: $result');
            if (result) {
              print('Navigating to home');
              Navigator.of(context).push(
                MaterialPageRoute(builder: (_) => const HomeScreen()),
              );
            }
          });
        },
        child: const Icon(Icons.login),
      ),
      body: const Center(
        child: Text('Login Screen'),
      ),
    );
  }
}