mirror of https://github.com/flutter/samples.git
navigation_and_routing: a bunch of cleanup (#886)
Fail early on nullable context objects - no code paths allow null Eliminate superfluous private function Use a function over an abstract class with one methodpull/887/head
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// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'package:flutter/foundation.dart';
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import 'package:flutter/widgets.dart';
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/// A mock authentication service
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class BookstoreAuth extends ChangeNotifier {
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bool _signedIn = false;
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bool get signedIn => _signedIn;
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Future<void> signOut() async {
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await Future<void>.delayed(const Duration(milliseconds: 200));
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// Sign out.
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_signedIn = false;
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notifyListeners();
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}
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Future<bool> signIn(String username, String password) async {
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await Future<void>.delayed(const Duration(milliseconds: 200));
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// Sign in. Allow any password.
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_signedIn = true;
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notifyListeners();
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return _signedIn;
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}
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@override
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bool operator ==(Object other) =>
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other is BookstoreAuth && other._signedIn == _signedIn;
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@override
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int get hashCode => _signedIn.hashCode;
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}
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class BookstoreAuthScope extends InheritedNotifier<BookstoreAuth> {
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const BookstoreAuthScope({
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required BookstoreAuth notifier,
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required Widget child,
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Key? key,
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}) : super(key: key, notifier: notifier, child: child);
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static BookstoreAuth? of(BuildContext context) => context
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.dependOnInheritedWidgetOfExactType<BookstoreAuthScope>()
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?.notifier;
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}
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@ -1,32 +0,0 @@
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// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import '../routing.dart';
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import 'auth.dart';
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/// An implementation of [RouteGuard] that redirects to /signIn
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class BookstoreRouteGuard implements RouteGuard<ParsedRoute> {
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final BookstoreAuth auth;
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BookstoreRouteGuard({
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required this.auth,
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});
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/// Redirect to /signin if the user isn't signed in.
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@override
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Future<ParsedRoute> redirect(ParsedRoute from) async {
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final signedIn = auth.signedIn;
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final signInRoute = ParsedRoute('/signin', '/signin', {}, {});
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// Go to /signin if the user is not signed in
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if (!signedIn && from != signInRoute) {
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return signInRoute;
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}
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// Go to /books if the user is signed in and tries to go to /signin.
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else if (signedIn && from == signInRoute) {
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return ParsedRoute('/books/popular', '/books/popular', {}, {});
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}
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return from;
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}
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}
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