blob: 2d00dbe4ef7fd3124d61f914f3d96aaa2ff2373e [file] [log] [blame]
// Copyright 2013 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.
import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:provider/provider.dart';
import 'shared/data.dart';
void main() => runApp(const App());
/// The main app.
class App extends StatefulWidget {
/// Creates an [App].
const App({Key? key}) : super(key: key);
/// The title of the app.
static const String title = 'GoRouter Example: Stream Refresh';
@override
State<App> createState() => _AppState();
}
class _AppState extends State<App> {
late LoggedInState loggedInState;
late GoRouter router;
@override
void initState() {
loggedInState = LoggedInState.seeded(false);
router = GoRouter(
routes: <GoRoute>[
GoRoute(
path: '/',
builder: (BuildContext context, GoRouterState state) =>
HomeScreen(families: Families.data),
routes: <GoRoute>[
GoRoute(
path: 'family/:fid',
builder: (BuildContext context, GoRouterState state) =>
FamilyScreen(
family: Families.family(state.params['fid']!),
),
routes: <GoRoute>[
GoRoute(
path: 'person/:pid',
builder: (BuildContext context, GoRouterState state) {
final Family family = Families.family(state.params['fid']!);
final Person person = family.person(state.params['pid']!);
return PersonScreen(family: family, person: person);
},
),
],
),
],
),
GoRoute(
path: '/login',
builder: (BuildContext context, GoRouterState state) =>
const LoginScreen(),
),
],
// redirect to the login page if the user is not logged in
redirect: (GoRouterState state) {
// if the user is not logged in, they need to login
final bool loggedIn = loggedInState.state;
final bool loggingIn = state.subloc == '/login';
// bundle the location the user is coming from into a query parameter
final String fromp = state.subloc == '/' ? '' : '?from=${state.subloc}';
if (!loggedIn) {
return loggingIn ? null : '/login$fromp';
}
// if the user is logged in, send them where they were going before (or
// home if they weren't going anywhere)
if (loggingIn) {
return state.queryParams['from'] ?? '/';
}
// no need to redirect at all
return null;
},
// changes on the listenable will cause the router to refresh it's route
refreshListenable: GoRouterRefreshStream(loggedInState.stream),
);
super.initState();
}
// add the login info into the tree as app state that can change over time
@override
Widget build(BuildContext context) => Provider<LoggedInState>.value(
value: loggedInState,
child: MaterialApp.router(
routeInformationProvider: router.routeInformationProvider,
routeInformationParser: router.routeInformationParser,
routerDelegate: router.routerDelegate,
title: App.title,
debugShowCheckedModeBanner: false,
),
);
@override
void dispose() {
loggedInState.dispose();
super.dispose();
}
}
/// The home screen that shows a list of families.
class HomeScreen extends StatelessWidget {
/// Creates a [HomeScreen].
const HomeScreen({
required this.families,
Key? key,
}) : super(key: key);
/// The list of families.
final List<Family> families;
@override
Widget build(BuildContext context) {
final LoggedInState info = context.read<LoggedInState>();
return Scaffold(
appBar: AppBar(
title: const Text(App.title),
actions: <Widget>[
IconButton(
onPressed: () => info.emit(false),
icon: const Icon(Icons.logout),
)
],
),
body: ListView(
children: <Widget>[
for (final Family f in families)
ListTile(
title: Text(f.name),
onTap: () => context.go('/family/${f.id}'),
)
],
),
);
}
}
/// The screen that shows a list of persons in a family.
class FamilyScreen extends StatelessWidget {
/// Creates a [FamilyScreen].
const FamilyScreen({
required this.family,
Key? key,
}) : super(key: key);
/// The family to display.
final Family family;
@override
Widget build(BuildContext context) => Scaffold(
appBar: AppBar(title: Text(family.name)),
body: ListView(
children: <Widget>[
for (final Person p in family.people)
ListTile(
title: Text(p.name),
onTap: () => context.go('/family/${family.id}/person/${p.id}'),
),
],
),
);
}
/// The person screen.
class PersonScreen extends StatelessWidget {
/// Creates a [PersonScreen].
const PersonScreen({
required this.family,
required this.person,
Key? key,
}) : super(key: key);
/// The family this person belong to.
final Family family;
/// The person to be displayed.
final Person person;
@override
Widget build(BuildContext context) => Scaffold(
appBar: AppBar(title: Text(person.name)),
body: Text('${person.name} ${family.name} is ${person.age} years old'),
);
}
/// The login screen.
class LoginScreen extends StatelessWidget {
/// Creates a [LoginScreen].
const LoginScreen({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) => Scaffold(
appBar: AppBar(title: const Text(App.title)),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
ElevatedButton(
onPressed: () {
// log a user in, letting all the listeners know
context.read<LoggedInState>().emit(true);
},
child: const Text('Login'),
),
],
),
),
);
}