samples/navigation_and_routing/lib/src/screens/settings.dart

// Copyright 2021, 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.

import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:url_launcher/link.dart';

import '../auth.dart';

class SettingsScreen extends StatefulWidget {
  const SettingsScreen({super.key});

  @override
  State<SettingsScreen> createState() => _SettingsScreenState();
}

class _SettingsScreenState extends State<SettingsScreen> {
  @override
  Widget build(BuildContext context) => Scaffold(
    body: SafeArea(
      child: SingleChildScrollView(
        child: Align(
          alignment: Alignment.topCenter,
          child: ConstrainedBox(
            constraints: const BoxConstraints(maxWidth: 400),
            child: const Card(
              child: Padding(
                padding: EdgeInsets.symmetric(vertical: 18, horizontal: 12),
                child: SettingsContent(),
              ),
            ),
          ),
        ),
      ),
    ),
  );
}

class SettingsContent extends StatelessWidget {
  const SettingsContent({super.key});

  @override
  Widget build(BuildContext context) => Column(
    children: [
      ...[
        Text('Settings', style: Theme.of(context).textTheme.headlineMedium),
        FilledButton(
          onPressed: () {
            BookstoreAuth.of(context).signOut();
          },
          child: const Text('Sign out'),
        ),
        const Text('Example using the Link widget:'),
        Link(
          uri: Uri.parse('/books/all/book/0'),
          builder:
              (context, followLink) => TextButton(
                onPressed: followLink,
                child: const Text('/books/all/book/0'),
              ),
        ),
        const Text('Example using GoRouter.of(context).go():'),
        TextButton(
          child: const Text('/books/all/book/0'),
          onPressed: () {
            GoRouter.of(context).go('/books/all/book/0');
          },
        ),
      ].map((w) => Padding(padding: const EdgeInsets.all(8), child: w)),
      const Text('Displays a dialog on the root Navigator:'),
      TextButton(
        onPressed:
            () => showDialog<String>(
              context: context,
              builder:
                  (context) => AlertDialog(
                    title: const Text('Alert!'),
                    content: const Text('The alert description goes here.'),
                    actions: [
                      TextButton(
                        onPressed: () => Navigator.pop(context, 'Cancel'),
                        child: const Text('Cancel'),
                      ),
                      TextButton(
                        onPressed: () => Navigator.pop(context, 'OK'),
                        child: const Text('OK'),
                      ),
                    ],
                  ),
            ),
        child: const Text('Show Dialog'),
      ),
    ],
  );
}