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// 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:collection/collection.dart';
import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'src/auth.dart';
import 'src/data/author.dart';
import 'src/data/book.dart';
import 'src/data/library.dart';
import 'src/screens/author_details.dart';
import 'src/screens/authors.dart';
import 'src/screens/book_details.dart';
import 'src/screens/books.dart';
import 'src/screens/scaffold.dart';
import 'src/screens/settings.dart';
import 'src/screens/sign_in.dart';
void main() => runApp(Bookstore());
/// The book store view.
class Bookstore extends StatelessWidget {
/// Creates a [Bookstore].
Bookstore({Key? key}) : super(key: key);
final ValueKey<String> _scaffoldKey = const ValueKey<String>('App scaffold');
@override
Widget build(BuildContext context) => BookstoreAuthScope(
notifier: _auth,
child: MaterialApp.router(
routeInformationProvider: _router.routeInformationProvider,
routerDelegate: _router.routerDelegate,
routeInformationParser: _router.routeInformationParser,
),
);
final BookstoreAuth _auth = BookstoreAuth();
late final GoRouter _router = GoRouter(
routes: <GoRoute>[
GoRoute(
path: '/',
redirect: (_) => '/books',
),
GoRoute(
path: '/signin',
pageBuilder: (BuildContext context, GoRouterState state) =>
FadeTransitionPage(
key: state.pageKey,
child: SignInScreen(
onSignIn: (Credentials credentials) {
BookstoreAuthScope.of(context)
.signIn(credentials.username, credentials.password);
},
),
),
),
GoRoute(
path: '/books',
redirect: (_) => '/books/popular',
),
GoRoute(
path: '/book/:bookId',
redirect: (GoRouterState state) =>
'/books/all/${state.params['bookId']}',
),
GoRoute(
path: '/books/:kind(new|all|popular)',
pageBuilder: (BuildContext context, GoRouterState state) =>
FadeTransitionPage(
key: _scaffoldKey,
child: BookstoreScaffold(
selectedTab: ScaffoldTab.books,
child: BooksScreen(state.params['kind']!),
),
),
routes: <GoRoute>[
GoRoute(
path: ':bookId',
builder: (BuildContext context, GoRouterState state) {
final String bookId = state.params['bookId']!;
final Book? selectedBook = libraryInstance.allBooks
.firstWhereOrNull((Book b) => b.id.toString() == bookId);
return BookDetailsScreen(book: selectedBook);
},
),
],
),
GoRoute(
path: '/author/:authorId',
redirect: (GoRouterState state) =>
'/authors/${state.params['authorId']}',
),
GoRoute(
path: '/authors',
pageBuilder: (BuildContext context, GoRouterState state) =>
FadeTransitionPage(
key: _scaffoldKey,
child: const BookstoreScaffold(
selectedTab: ScaffoldTab.authors,
child: AuthorsScreen(),
),
),
routes: <GoRoute>[
GoRoute(
path: ':authorId',
builder: (BuildContext context, GoRouterState state) {
final int authorId = int.parse(state.params['authorId']!);
final Author? selectedAuthor = libraryInstance.allAuthors
.firstWhereOrNull((Author a) => a.id == authorId);
return AuthorDetailsScreen(author: selectedAuthor);
},
),
],
),
GoRoute(
path: '/settings',
pageBuilder: (BuildContext context, GoRouterState state) =>
FadeTransitionPage(
key: _scaffoldKey,
child: const BookstoreScaffold(
selectedTab: ScaffoldTab.settings,
child: SettingsScreen(),
),
),
),
],
redirect: _guard,
refreshListenable: _auth,
debugLogDiagnostics: true,
);
String? _guard(GoRouterState state) {
final bool signedIn = _auth.signedIn;
final bool signingIn = state.subloc == '/signin';
// Go to /signin if the user is not signed in
if (!signedIn && !signingIn) {
return '/signin';
}
// Go to /books if the user is signed in and tries to go to /signin.
else if (signedIn && signingIn) {
return '/books';
}
// no redirect
return null;
}
}
/// A page that fades in an out.
class FadeTransitionPage extends CustomTransitionPage<void> {
/// Creates a [FadeTransitionPage].
FadeTransitionPage({
required LocalKey key,
required Widget child,
}) : super(
key: key,
transitionsBuilder: (BuildContext context,
Animation<double> animation,
Animation<double> secondaryAnimation,
Widget child) =>
FadeTransition(
opacity: animation.drive(_curveTween),
child: child,
),
child: child);
static final CurveTween _curveTween = CurveTween(curve: Curves.easeIn);
}