beamer 1.0.0-pre.2.1

A routing package that lets you navigate through guarded page stacks and URLs using the Router and Navigator's Pages API, aka "Navigator 2.0".

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:beamer/beamer.dart';

// DATA
const List<Map<String, String>> books = [
  {
    'id': '1',
    'title': 'Stranger in a Strange Land',
    'author': 'Robert A. Heinlein',
  },
  {
    'id': '2',
    'title': 'Foundation',
    'author': 'Isaac Asimov',
  },
  {
    'id': '3',
    'title': 'Fahrenheit 451',
    'author': 'Ray Bradbury',
  },
];

// SCREENS
class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home Screen'),
      ),
      body: Center(
        child: ElevatedButton(
          //onPressed: () => context.beamToNamed('/books'),
          onPressed: () => context.currentBeamLocation.state = BeamState(
            pathBlueprintSegments: ['books'],
          ),
          child: Text('See books'),
        ),
      ),
    );
  }
}

class BooksScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final titleQuery =
        context.currentBeamLocation.state.queryParameters['title'] ?? '';
    return Scaffold(
      appBar: AppBar(
        title: Text('Books'),
      ),
      body: ListView(
        children: books
            .where((book) =>
                book['title'].toLowerCase().contains(titleQuery.toLowerCase()))
            .map(
              (book) => ListTile(
                title: Text(book['title']),
                subtitle: Text(book['author']),
                //onTap: () => context.beamToNamed('/books/${book['id']}'),
                onTap: () => context.currentBeamLocation.update(
                  (state) => state.copyWith(
                    pathBlueprintSegments: ['books', ':bookId'],
                    pathParameters: {'bookId': book['id']},
                  ),
                ),
              ),
            )
            .toList(),
      ),
    );
  }
}

class BookDetailsScreen extends StatelessWidget {
  BookDetailsScreen({
    this.bookId,
  }) : book = books.firstWhere((book) => book['id'] == bookId);

  final String bookId;
  final Map<String, String> book;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(book['title']),
      ),
      body: Padding(
        padding: const EdgeInsets.all(8.0),
        child: Text('Author: ${book['author']}'),
      ),
    );
  }
}

// LOCATIONS
class BooksLocation extends BeamLocation {
  BooksLocation(BeamState state) : super(state);

  @override
  List<String> get pathBlueprints => ['/books/:bookId'];

  @override
  List<BeamPage> buildPages(BuildContext context, BeamState state) => [
        BeamPage(
          key: ValueKey('home'),
          child: HomeScreen(),
        ),
        if (state.uri.pathSegments.contains('books'))
          BeamPage(
            key: ValueKey('books-${state.queryParameters['title'] ?? ''}'),
            child: BooksScreen(),
          ),
        if (state.pathParameters.containsKey('bookId'))
          BeamPage(
            key: ValueKey('book-${state.pathParameters['bookId']}'),
            child: BookDetailsScreen(
              bookId: state.pathParameters['bookId'],
            ),
          ),
      ];
}

// APP
class MyApp extends StatelessWidget {
  final routerDelegate = BeamerRouterDelegate(
    locationBuilder: (state) => BooksLocation(state),
  );
  @override
  Widget build(BuildContext context) {
    return MaterialApp.router(
      routerDelegate: routerDelegate,
      routeInformationParser: BeamerRouteInformationParser(),
      backButtonDispatcher:
          BeamerBackButtonDispatcher(delegate: routerDelegate),
    );
  }
}

void main() {
  runApp(MyApp());
}