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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flutter code sample for Navigator
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Code Sample for Navigator',
// MaterialApp contains our top-level Navigator
initialRoute: '/',
routes: <String, WidgetBuilder>{
'/': (BuildContext context) => const HomePage(),
'/signup': (BuildContext context) => const SignUpPage(),
},
);
}
}
class HomePage extends StatelessWidget {
const HomePage({super.key});
@override
Widget build(BuildContext context) {
return DefaultTextStyle(
style: Theme.of(context).textTheme.headline4!,
child: Container(
color: Colors.white,
alignment: Alignment.center,
child: const Text('Home Page'),
),
);
}
}
class CollectPersonalInfoPage extends StatelessWidget {
const CollectPersonalInfoPage({super.key});
@override
Widget build(BuildContext context) {
return DefaultTextStyle(
style: Theme.of(context).textTheme.headline4!,
child: GestureDetector(
onTap: () {
// This moves from the personal info page to the credentials page,
// replacing this page with that one.
Navigator.of(context)
.pushReplacementNamed('signup/choose_credentials');
},
child: Container(
color: Colors.lightBlue,
alignment: Alignment.center,
child: const Text('Collect Personal Info Page'),
),
),
);
}
}
class ChooseCredentialsPage extends StatelessWidget {
const ChooseCredentialsPage({
super.key,
required this.onSignupComplete,
});
final VoidCallback onSignupComplete;
@override
Widget build(BuildContext context) {
return GestureDetector(
onTap: onSignupComplete,
child: DefaultTextStyle(
style: Theme.of(context).textTheme.headline4!,
child: Container(
color: Colors.pinkAccent,
alignment: Alignment.center,
child: const Text('Choose Credentials Page'),
),
),
);
}
}
class SignUpPage extends StatelessWidget {
const SignUpPage({super.key});
@override
Widget build(BuildContext context) {
// SignUpPage builds its own Navigator which ends up being a nested
// Navigator in our app.
return Navigator(
initialRoute: 'signup/personal_info',
onGenerateRoute: (RouteSettings settings) {
WidgetBuilder builder;
switch (settings.name) {
case 'signup/personal_info':
// Assume CollectPersonalInfoPage collects personal info and then
// navigates to 'signup/choose_credentials'.
builder = (BuildContext context) => const CollectPersonalInfoPage();
break;
case 'signup/choose_credentials':
// Assume ChooseCredentialsPage collects new credentials and then
// invokes 'onSignupComplete()'.
builder = (BuildContext _) => ChooseCredentialsPage(
onSignupComplete: () {
// Referencing Navigator.of(context) from here refers to the
// top level Navigator because SignUpPage is above the
// nested Navigator that it created. Therefore, this pop()
// will pop the entire "sign up" journey and return to the
// "/" route, AKA HomePage.
Navigator.of(context).pop();
},
);
break;
default:
throw Exception('Invalid route: ${settings.name}');
}
return MaterialPageRoute<void>(builder: builder, settings: settings);
},
);
}
}