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cleanup: remove old snippets from navigation and routing (#882)

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Kevin Moore 3 years ago committed by GitHub
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67
navigation_and_routing/old_snippets/navigator/anonymous_routes.dart
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// Copyright 2020, the Flutter project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// Shows how to use [Navigator] APIs to push and pop an anonymous
/// route. In this case, it is an instance of [MaterialPageRoute].
library anonymous_routes;
import 'package:flutter/material.dart';
void main() {
runApp(const Nav2App());
}
class Nav2App extends StatelessWidget {
const Nav2App({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: HomeScreen(),
);
}
}
class HomeScreen extends StatelessWidget {
const HomeScreen({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Center(
child: TextButton(
child: const Text('View Details'),
onPressed: () {
Navigator.push<void>(
context,
MaterialPageRoute(builder: (context) {
return const DetailScreen();
}),
);
},
),
),
);
}
}
class DetailScreen extends StatelessWidget {
const DetailScreen({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Center(
child: TextButton(
child: const Text('Pop!'),
onPressed: () {
Navigator.pop(context);
},
),
),
);
}
}

68
navigation_and_routing/old_snippets/navigator/named_routes.dart
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// Copyright 2020, the Flutter project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// Shows how to use define named routes via the `routes` parameter on
/// MaterialApp, and navigate using Navigator.pushNamed.
library named_routes;
import 'package:flutter/material.dart';
void main() {
runApp(const Nav2App());
}
class Nav2App extends StatelessWidget {
const Nav2App({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
routes: {
'/': (context) => const HomeScreen(),
'/details': (context) => const DetailScreen(),
},
);
}
}
class HomeScreen extends StatelessWidget {
const HomeScreen({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Center(
child: TextButton(
child: const Text('View Details'),
onPressed: () {
Navigator.pushNamed(
context,
'/details',
);
},
),
),
);
}
}
class DetailScreen extends StatelessWidget {
const DetailScreen({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Center(
child: TextButton(
child: const Text('Pop!'),
onPressed: () {
Navigator.pop(context);
},
),
),
);
}
}

108
navigation_and_routing/old_snippets/navigator/on_generate_route.dart
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// Copyright 2020, the Flutter project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// Shows how to handle arbitrary named routes using the `onGenerateRoute`
/// callback defined in the `MaterialApp` constructor.
library on_generate_route;
import 'package:flutter/material.dart';
void main() {
runApp(const Nav2App());
}
class Nav2App extends StatelessWidget {
const Nav2App({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
onGenerateRoute: (settings) {
// Handle '/'
if (settings.name == '/') {
return MaterialPageRoute<void>(
builder: (context) => const HomeScreen());
}
// Handle '/details/:id'
var uri = Uri.parse(settings.name ?? '');
if (uri.pathSegments.length == 2 &&
uri.pathSegments.first == 'details') {
var id = uri.pathSegments[1];
return MaterialPageRoute<void>(
builder: (context) => DetailScreen(id: id));
}
return MaterialPageRoute<void>(
builder: (context) => const UnknownScreen());
},
);
}
}
class HomeScreen extends StatelessWidget {
const HomeScreen({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Center(
child: TextButton(
child: const Text('View Details'),
onPressed: () {
Navigator.pushNamed(
context,
'/details/1',
);
},
),
),
);
}
}
class DetailScreen extends StatelessWidget {
final String id;
const DetailScreen({
required this.id,
Key? key,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text('Viewing details for item $id'),
TextButton(
child: const Text('Pop!'),
onPressed: () {
Navigator.pop(context);
},
),
],
),
),
);
}
}
class UnknownScreen extends StatelessWidget {
const UnknownScreen({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: const Center(
child: Text('404!'),
),
);
}
}

147
navigation_and_routing/old_snippets/router/pages.dart
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// Copyright 2020, the Flutter project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// Shows how to define a list of [Page] objects on Navigator declaratively.
library nav2_pages;
import 'package:flutter/material.dart';
void main() {
runApp(const BooksApp());
}
class Book {
final String title;
final String author;
Book(this.title, this.author);
}
class BooksApp extends StatefulWidget {
const BooksApp({Key? key}) : super(key: key);
@override
State<StatefulWidget> createState() => _BooksAppState();
}
class _BooksAppState extends State<BooksApp> {
Book? _selectedBook;
final List<Book> books = [
Book('Left Hand of Darkness', 'Ursula K. Le Guin'),
Book('Too Like the Lightning', 'Ada Palmer'),
Book('Kindred', 'Octavia E. Butler'),
];
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Books App',
home: Navigator(
pages: [
MaterialPage<void>(
key: const ValueKey('BooksListPage'),
child: BooksListScreen(
books: books,
onTapped: _handleBookTapped,
),
),
if (_selectedBook != null) BookDetailsPage(book: _selectedBook)
],
onPopPage: (route, dynamic result) {
if (!route.didPop(result)) {
return false;
}
// Update the list of pages by setting _selectedBook to null
setState(() {
_selectedBook = null;
});
return true;
},
),
);
}
void _handleBookTapped(Book book) {
setState(() {
_selectedBook = book;
});
}
}
class BookDetailsPage extends Page<void> {
final Book? book;
BookDetailsPage({
this.book,
}) : super(key: ValueKey(book));
@override
Route createRoute(BuildContext context) {
return MaterialPageRoute<void>(
settings: this,
builder: (context) {
return BookDetailsScreen(book: book);
},
);
}
}
class BooksListScreen extends StatelessWidget {
final List<Book> books;
final ValueChanged<Book> onTapped;
const BooksListScreen({
required this.books,
required this.onTapped,
Key? key,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: ListView(
children: [
for (var book in books)
ListTile(
title: Text(book.title),
subtitle: Text(book.author),
onTap: () => onTapped(book),
)
],
),
);
}
}
class BookDetailsScreen extends StatelessWidget {
final Book? book;
const BookDetailsScreen({
@required this.book,
Key? key,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
if (book != null) ...[
Text(book!.title, style: Theme.of(context).textTheme.headline6),
Text(book!.author, style: Theme.of(context).textTheme.subtitle1),
],
],
),
),
);
}
}

276
navigation_and_routing/old_snippets/router/router.dart
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// Copyright 2020, the Flutter project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// Full sample that shows a custom RouteInformationParser and RouterDelegate
/// parsing named routes and declaratively building the stack of pages for the
/// [Navigator].
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
void main() {
runApp(const BooksApp());
}
class Book {
final String title;
final String author;
Book(this.title, this.author);
}
class BooksApp extends StatefulWidget {
const BooksApp({Key? key}) : super(key: key);
@override
State<StatefulWidget> createState() => _BooksAppState();
}
class _BooksAppState extends State<BooksApp> {
final BookRouterDelegate _routerDelegate = BookRouterDelegate();
final BookRouteInformationParser _routeInformationParser =
BookRouteInformationParser();
@override
Widget build(BuildContext context) {
return MaterialApp.router(
title: 'Books App',
routerDelegate: _routerDelegate,
routeInformationParser: _routeInformationParser,
);
}
}
class BookRouteInformationParser extends RouteInformationParser<BookRoutePath> {
@override
Future<BookRoutePath> parseRouteInformation(
RouteInformation routeInformation,
) {
final uri = Uri.parse(routeInformation.location ?? '');
// Handle '/'
if (uri.pathSegments.isEmpty) {
return SynchronousFuture(BookRoutePath.home());
}
// Handle '/book/:id'
if (uri.pathSegments.length == 2 && uri.pathSegments[0] == 'book') {
var remaining = uri.pathSegments[1];
var id = int.tryParse(remaining);
if (id != null) {
return SynchronousFuture(BookRoutePath.details(id));
}
}
// Handle unknown routes
return SynchronousFuture(BookRoutePath.unknown());
}
@override
RouteInformation? restoreRouteInformation(BookRoutePath configuration) {
if (configuration.isUnknown) {
return const RouteInformation(location: '/404');
}
if (configuration.isHomePage) {
return const RouteInformation(location: '/');
}
if (configuration.isDetailsPage) {
return RouteInformation(location: '/book/${configuration.id}');
}
return null;
}
}
class BookRouterDelegate extends RouterDelegate<BookRoutePath>
with ChangeNotifier, PopNavigatorRouterDelegateMixin<BookRoutePath> {
@override
final GlobalKey<NavigatorState> navigatorKey;
Book? _selectedBook;
bool show404 = false;
final List<Book> books = [
Book('Left Hand of Darkness', 'Ursula K. Le Guin'),
Book('Too Like the Lightning', 'Ada Palmer'),
Book('Kindred', 'Octavia E. Butler'),
];
BookRouterDelegate() : navigatorKey = GlobalKey<NavigatorState>();
@override
BookRoutePath get currentConfiguration {
if (show404) {
return BookRoutePath.unknown();
}
return _selectedBook == null
? BookRoutePath.home()
: BookRoutePath.details(books.indexOf(_selectedBook!));
}
@override
Widget build(BuildContext context) {
return Navigator(
key: navigatorKey,
pages: [
MaterialPage<void>(
key: const ValueKey('BooksListPage'),
child: BooksListScreen(
books: books,
onTapped: _handleBookTapped,
),
),
if (show404)
const MaterialPage<void>(
key: ValueKey('UnknownPage'),
child: UnknownScreen(),
)
else if (_selectedBook != null)
BookDetailsPage(book: _selectedBook!)
],
onPopPage: (route, dynamic result) {
if (!route.didPop(result)) {
return false;
}
// Update the list of pages by setting _selectedBook to null
_selectedBook = null;
show404 = false;
notifyListeners();
return true;
},
);
}
@override
Future<void> setNewRoutePath(BookRoutePath configuration) {
if (configuration.isUnknown) {
_selectedBook = null;
show404 = true;
return SynchronousFuture<void>(null);
}
if (configuration.isDetailsPage) {
if (configuration.id! < 0 || configuration.id! > books.length - 1) {
show404 = true;
return SynchronousFuture<void>(null);
}
_selectedBook = books[configuration.id!];
} else {
_selectedBook = null;
}
show404 = false;
return SynchronousFuture<void>(null);
}
void _handleBookTapped(Book book) {
_selectedBook = book;
notifyListeners();
}
}
class BookDetailsPage extends Page<void> {
final Book book;
BookDetailsPage({
required this.book,
}) : super(key: ValueKey(book));
@override
Route createRoute(BuildContext context) {
return MaterialPageRoute<void>(
settings: this,
builder: (context) {
return BookDetailsScreen(book: book);
},
);
}
}
class BookRoutePath {
final int? id;
final bool isUnknown;
BookRoutePath.home()
: id = null,
isUnknown = false;
BookRoutePath.details(this.id) : isUnknown = false;
BookRoutePath.unknown()
: id = null,
isUnknown = true;
bool get isHomePage => id == null;
bool get isDetailsPage => id != null;
}
class BooksListScreen extends StatelessWidget {
final List<Book> books;
final ValueChanged<Book> onTapped;
const BooksListScreen({
required this.books,
required this.onTapped,
Key? key,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: ListView(
children: [
for (var book in books)
ListTile(
title: Text(book.title),
subtitle: Text(book.author),
onTap: () => onTapped(book),
)
],
),
);
}
}
class BookDetailsScreen extends StatelessWidget {
final Book book;
const BookDetailsScreen({
required this.book,
Key? key,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(book.title, style: Theme.of(context).textTheme.headline6),
Text(book.author, style: Theme.of(context).textTheme.subtitle1),
],
),
),
);
}
}
class UnknownScreen extends StatelessWidget {
const UnknownScreen({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: const Center(
child: Text('404!'),
),
);
}
}

426
navigation_and_routing/old_snippets/router_advanced/nested_router.dart
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// Copyright 2020, the Flutter project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// Shows two [RouterDelegate], one nested within the other. A
/// [BottomNavigationBar] can be used to select the route of the outer
/// RouterDelegate, and additional routes can be pushed onto the inner
/// RouterDelegate / Navigator.
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
void main() {
runApp(const NestedRouterDemo());
}
class Book {
final String title;
final String author;
Book(this.title, this.author);
}
class NestedRouterDemo extends StatefulWidget {
const NestedRouterDemo({Key? key}) : super(key: key);
@override
_NestedRouterDemoState createState() => _NestedRouterDemoState();
}
class _NestedRouterDemoState extends State<NestedRouterDemo> {
final BookRouterDelegate _routerDelegate = BookRouterDelegate();
final BookRouteInformationParser _routeInformationParser =
BookRouteInformationParser();
@override
Widget build(BuildContext context) {
return MaterialApp.router(
title: 'Books App',
routerDelegate: _routerDelegate,
routeInformationParser: _routeInformationParser,
);
}
}
class BooksAppState extends ChangeNotifier {
int _selectedIndex;
Book? _selectedBook;
final List<Book> books = [
Book('Left Hand of Darkness', 'Ursula K. Le Guin'),
Book('Too Like the Lightning', 'Ada Palmer'),
Book('Kindred', 'Octavia E. Butler'),
];
BooksAppState() : _selectedIndex = 0;
int get selectedIndex => _selectedIndex;
set selectedIndex(int idx) {
_selectedIndex = idx;
if (_selectedIndex == 1) {
// Remove this line if you want to keep the selected book when navigating
// between "settings" and "home" which book was selected when Settings is
// tapped.
selectedBook = null;
}
notifyListeners();
}
Book? get selectedBook => _selectedBook;
set selectedBook(Book? book) {
_selectedBook = book;
notifyListeners();
}
int getSelectedBookById() {
if (_selectedBook == null) return 0;
if (!books.contains(_selectedBook)) return 0;
return books.indexOf(_selectedBook!);
}
void setSelectedBookById(int id) {
if (id < 0 || id > books.length - 1) {
return;
}
_selectedBook = books[id];
notifyListeners();
}
}
class BookRouteInformationParser extends RouteInformationParser<BookRoutePath> {
@override
Future<BookRoutePath> parseRouteInformation(
RouteInformation routeInformation,
) {
final uri = Uri.parse(routeInformation.location ?? '');
if (uri.pathSegments.isNotEmpty && uri.pathSegments.first == 'settings') {
return SynchronousFuture(BooksSettingsPath());
} else {
if (uri.pathSegments.length >= 2 && uri.pathSegments[0] == 'book') {
return SynchronousFuture(
BooksDetailsPath(int.tryParse(uri.pathSegments[1])!),
);
}
return SynchronousFuture(BooksListPath());
}
}
@override
RouteInformation? restoreRouteInformation(BookRoutePath configuration) {
if (configuration is BooksListPath) {
return const RouteInformation(location: '/home');
}
if (configuration is BooksSettingsPath) {
return const RouteInformation(location: '/settings');
}
if (configuration is BooksDetailsPath) {
return RouteInformation(location: '/book/${configuration.id}');
}
return null;
}
}
class BookRouterDelegate extends RouterDelegate<BookRoutePath>
with ChangeNotifier, PopNavigatorRouterDelegateMixin<BookRoutePath> {
@override
final GlobalKey<NavigatorState> navigatorKey;
BooksAppState appState = BooksAppState();
BookRouterDelegate() : navigatorKey = GlobalKey<NavigatorState>() {
appState.addListener(notifyListeners);
}
@override
BookRoutePath get currentConfiguration {
if (appState.selectedIndex == 1) {
return BooksSettingsPath();
} else {
if (appState.selectedBook == null) {
return BooksListPath();
} else {
return BooksDetailsPath(appState.getSelectedBookById());
}
}
}
@override
Widget build(BuildContext context) {
return Navigator(
key: navigatorKey,
pages: [
MaterialPage<void>(
child: AppShell(appState: appState),
),
],
onPopPage: (route, dynamic result) {
if (!route.didPop(result)) {
return false;
}
if (appState.selectedBook != null) {
appState.selectedBook = null;
}
notifyListeners();
return true;
},
);
}
@override
Future<void> setNewRoutePath(BookRoutePath configuration) {
if (configuration is BooksListPath) {
appState.selectedIndex = 0;
appState.selectedBook = null;
} else if (configuration is BooksSettingsPath) {
appState.selectedIndex = 1;
} else if (configuration is BooksDetailsPath) {
appState.setSelectedBookById(configuration.id);
}
return SynchronousFuture<void>(null);
}
}
// Routes
abstract class BookRoutePath {}
class BooksListPath extends BookRoutePath {}
class BooksSettingsPath extends BookRoutePath {}
class BooksDetailsPath extends BookRoutePath {
final int id;
BooksDetailsPath(this.id);
}
// Widget that contains the AdaptiveNavigationScaffold
class AppShell extends StatefulWidget {
final BooksAppState appState;
const AppShell({
required this.appState,
Key? key,
}) : super(key: key);
@override
_AppShellState createState() => _AppShellState();
}
class _AppShellState extends State<AppShell> {
late final InnerRouterDelegate _routerDelegate;
late final ChildBackButtonDispatcher _backButtonDispatcher;
@override
void initState() {
super.initState();
_routerDelegate = InnerRouterDelegate(widget.appState);
}
@override
void didUpdateWidget(covariant AppShell oldWidget) {
super.didUpdateWidget(oldWidget);
_routerDelegate.appState = widget.appState;
}
@override
void didChangeDependencies() {
super.didChangeDependencies();
// Defer back button dispatching to the child router
_backButtonDispatcher = Router.of(context)
.backButtonDispatcher!
.createChildBackButtonDispatcher();
}
@override
Widget build(BuildContext context) {
var appState = widget.appState;
// Claim priority, If there are parallel sub router, you will need
// to pick which one should take priority;
_backButtonDispatcher.takePriority();
return Scaffold(
appBar: AppBar(),
body: Router(
routerDelegate: _routerDelegate,
backButtonDispatcher: _backButtonDispatcher,
),
bottomNavigationBar: BottomNavigationBar(
items: const [
BottomNavigationBarItem(icon: Icon(Icons.home), label: 'Home'),
BottomNavigationBarItem(
icon: Icon(Icons.settings), label: 'Settings'),
],
currentIndex: appState.selectedIndex,
onTap: (newIndex) {
appState.selectedIndex = newIndex;
},
),
);
}
}
class InnerRouterDelegate extends RouterDelegate<BookRoutePath>
with ChangeNotifier, PopNavigatorRouterDelegateMixin<BookRoutePath> {
@override
final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
BooksAppState get appState => _appState;
BooksAppState _appState;
set appState(BooksAppState value) {
if (value == _appState) {
return;
}
_appState = value;
notifyListeners();
}
InnerRouterDelegate(this._appState);
@override
Widget build(BuildContext context) {
return Navigator(
key: navigatorKey,
pages: [
if (appState.selectedIndex == 0) ...[
FadeAnimationPage(
child: BooksListScreen(
books: appState.books,
onTapped: _handleBookTapped,
),
key: const ValueKey('BooksListPage'),
),
if (appState.selectedBook != null)
MaterialPage<void>(
key: ValueKey(appState.selectedBook),
child: BookDetailsScreen(book: appState.selectedBook!),
),
] else
const FadeAnimationPage(
child: SettingsScreen(),
key: ValueKey('SettingsPage'),
),
],
onPopPage: (route, dynamic result) {
appState.selectedBook = null;
notifyListeners();
return route.didPop(result);
},
);
}
@override
Future<void> setNewRoutePath(BookRoutePath configuration) {
// This is not required for inner router delegate because it does not
// parse route
assert(false);
return SynchronousFuture<void>(null);
}
void _handleBookTapped(Book book) {
appState.selectedBook = book;
notifyListeners();
}
}
class FadeAnimationPage extends Page<void> {
final Widget child;
const FadeAnimationPage({LocalKey? key, required this.child})
: super(key: key);
@override
Route createRoute(BuildContext context) {
return PageRouteBuilder<void>(
settings: this,
pageBuilder: (context, animation, animation2) {
var curveTween = CurveTween(curve: Curves.easeIn);
return FadeTransition(
opacity: animation.drive(curveTween),
child: child,
);
},
);
}
}
// Screens
class BooksListScreen extends StatelessWidget {
final List<Book> books;
final ValueChanged<Book> onTapped;
const BooksListScreen({
required this.books,
required this.onTapped,
Key? key,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
body: ListView(
children: [
for (var book in books)
ListTile(
title: Text(book.title),
subtitle: Text(book.author),
onTap: () => onTapped(book),
)
],
),
);
}
}
class BookDetailsScreen extends StatelessWidget {
final Book book;
const BookDetailsScreen({
required this.book,
Key? key,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
body: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
TextButton(
onPressed: () {
Navigator.of(context).pop();
},
child: const Text('Back'),
),
...[
Text(book.title, style: Theme.of(context).textTheme.headline6),
Text(book.author, style: Theme.of(context).textTheme.subtitle1),
],
],
),
),
);
}
}
class SettingsScreen extends StatelessWidget {
const SettingsScreen({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return const Scaffold(
body: Center(
child: Text('Settings screen'),
),
);
}
}

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navigation_and_routing/old_snippets/router_advanced/transition_delegate.dart
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// Copyright 2020, the Flutter project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// Shows how a custom TransitionDelegate can be used to customized when
/// transition animations are shown. (For example,
/// [when two routes are popped off the stack](https://github.com/flutter/flutter/issues/12146),
/// however the default TransitionDelegate will handle this if you are using
/// `Router`.)
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
void main() {
runApp(const BooksApp());
}
class Book {
final String title;
final String author;
Book(this.title, this.author);
}
class BooksApp extends StatefulWidget {
const BooksApp({Key? key}) : super(key: key);
@override
State<StatefulWidget> createState() => _BooksAppState();
}
class _BooksAppState extends State<BooksApp> {
final BookRouterDelegate _routerDelegate = BookRouterDelegate();
final BookRouteInformationParser _routeInformationParser =
BookRouteInformationParser();
@override
Widget build(BuildContext context) {
return MaterialApp.router(
title: 'Books App',
routerDelegate: _routerDelegate,
routeInformationParser: _routeInformationParser,
);
}
}
class BookRouteInformationParser extends RouteInformationParser<BookRoutePath> {
@override
Future<BookRoutePath> parseRouteInformation(
RouteInformation routeInformation,
) {
final uri = Uri.parse(routeInformation.location ?? '');
if (uri.pathSegments.length >= 2) {
var remaining = uri.pathSegments[1];
return SynchronousFuture(BookRoutePath.details(int.tryParse(remaining)!));
} else {
return SynchronousFuture(BookRoutePath.home());
}
}
@override
RouteInformation? restoreRouteInformation(BookRoutePath configuration) {
if (configuration.isHomePage) {
return const RouteInformation(location: '/');
}
if (configuration.isDetailsPage) {
return RouteInformation(location: '/book/${configuration.id}');
}
return null;
}
}
class BookRouterDelegate extends RouterDelegate<BookRoutePath>
with ChangeNotifier, PopNavigatorRouterDelegateMixin<BookRoutePath> {
@override
final GlobalKey<NavigatorState> navigatorKey;
Book? _selectedBook;
final List<Book> books = [
Book('Left Hand of Darkness', 'Ursula K. Le Guin'),
Book('Too Like the Lightning', 'Ada Palmer'),
Book('Kindred', 'Octavia E. Butler'),
];
BookRouterDelegate() : navigatorKey = GlobalKey<NavigatorState>();
@override
BookRoutePath get currentConfiguration => _selectedBook == null
? BookRoutePath.home()
: BookRoutePath.details(books.indexOf(_selectedBook!));
@override
Widget build(BuildContext context) {
return Navigator(
key: navigatorKey,
transitionDelegate: NoAnimationTransitionDelegate(),
pages: [
MaterialPage<void>(
key: const ValueKey('BooksListPage'),
child: BooksListScreen(
books: books,
onTapped: _handleBookTapped,
),
),
if (_selectedBook != null) BookDetailsPage(book: _selectedBook!)
],
onPopPage: (route, dynamic result) {
if (!route.didPop(result)) {
return false;
}
// Update the list of pages by setting _selectedBook to null
_selectedBook = null;
notifyListeners();
return true;
},
);
}
@override
Future<void> setNewRoutePath(BookRoutePath configuration) {
if (configuration.isDetailsPage) {
_selectedBook = books[configuration.id!];
}
return SynchronousFuture<void>(null);
}
void _handleBookTapped(Book book) {
_selectedBook = book;
notifyListeners();
}
}
class BookDetailsPage extends Page<void> {
final Book book;
BookDetailsPage({
required this.book,
}) : super(key: ValueKey(book));
@override
Route createRoute(BuildContext context) {
return MaterialPageRoute<void>(
settings: this,
builder: (context) {
return BookDetailsScreen(book: book);
},
);
}
}
class BookRoutePath {
final int? id;
BookRoutePath.home() : id = null;
BookRoutePath.details(this.id);
bool get isHomePage => id == null;
bool get isDetailsPage => id != null;
}
class BooksListScreen extends StatelessWidget {
final List<Book> books;
final ValueChanged<Book> onTapped;
const BooksListScreen({
required this.books,
required this.onTapped,
Key? key,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: ListView(
children: [
for (var book in books)
ListTile(
title: Text(book.title),
subtitle: Text(book.author),
onTap: () => onTapped(book),
)
],
),
);
}
}
class BookDetailsScreen extends StatelessWidget {
final Book book;
const BookDetailsScreen({
required this.book,
Key? key,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(book.title, style: Theme.of(context).textTheme.headline6),
Text(book.author, style: Theme.of(context).textTheme.subtitle1),
],
),
),
);
}
}
class NoAnimationTransitionDelegate extends TransitionDelegate<void> {
@override
Iterable<RouteTransitionRecord> resolve({
required List<RouteTransitionRecord> newPageRouteHistory,
required Map<RouteTransitionRecord?, RouteTransitionRecord>
locationToExitingPageRoute,
required Map<RouteTransitionRecord?, List<RouteTransitionRecord>>
pageRouteToPagelessRoutes,
}) {
final results = <RouteTransitionRecord>[];
for (final pageRoute in newPageRouteHistory) {
if (pageRoute.isWaitingForEnteringDecision) {
pageRoute.markForAdd();
}
results.add(pageRoute);
}
for (final exitingPageRoute in locationToExitingPageRoute.values) {
if (exitingPageRoute.isWaitingForExitingDecision) {
exitingPageRoute.markForRemove();
final pagelessRoutes = pageRouteToPagelessRoutes[exitingPageRoute];
if (pagelessRoutes != null) {
for (final pagelessRoute in pagelessRoutes) {
pagelessRoute.markForRemove();
}
}
}
results.add(exitingPageRoute);
}
return results;
}
}
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