packages/go_router/example/lib/named_routes.dart

// 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 'shared/data.dart';

// This scenario demonstrates how to navigate using named locations instead of
// URLs.
//
// Instead of hardcoding the URI locations , you can also use the named
// locations. To use this API, give a unique name to each GoRoute. The name can
// then be used in context.namedLocation to be translate back to the actual URL
// location.

void main() => runApp(App());

/// The main app.
class App extends StatelessWidget {
  /// Creates an [App].
  App({Key? key}) : super(key: key);

  /// The title of the app.
  static const String title = 'GoRouter Example: Named Routes';

  @override
  Widget build(BuildContext context) => MaterialApp.router(
        routeInformationProvider: _router.routeInformationProvider,
        routeInformationParser: _router.routeInformationParser,
        routerDelegate: _router.routerDelegate,
        title: title,
        debugShowCheckedModeBanner: false,
      );

  late final GoRouter _router = GoRouter(
    debugLogDiagnostics: true,
    routes: <GoRoute>[
      GoRoute(
        name: 'home',
        path: '/',
        builder: (BuildContext context, GoRouterState state) =>
            HomeScreen(families: Families.data),
        routes: <GoRoute>[
          GoRoute(
            name: 'family',
            path: 'family/:fid',
            builder: (BuildContext context, GoRouterState state) =>
                FamilyScreen(
              family: Families.family(state.params['fid']!),
            ),
            routes: <GoRoute>[
              GoRoute(
                name: 'person',
                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);
                },
              ),
            ],
          ),
        ],
      ),
    ],
  );
}

/// 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) {
    return Scaffold(
      appBar: AppBar(
        title: const Text(App.title),
      ),
      body: ListView(
        children: <Widget>[
          for (final Family f in families)
            ListTile(
              title: Text(f.name),
              onTap: () => context.go(context.namedLocation('family',
                  params: <String, String>{'fid': 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(context.namedLocation(
                  'person',
                  params: <String, String>{'fid': family.id, 'pid': p.id},
                  queryParams: <String, String>{'qid': 'quid'},
                )),
              ),
          ],
        ),
      );
}

/// 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'),
      );
}