[go_router_builder] Add ShellRoute support to go_router_builder

[johnpryan]

Depends on https://github.com/flutter/packages/pull/2730

Fixes flutter/flutter#111909

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[johnpryan]

I'm trying to add an example for ShellRouteData, but I'm stuck because the .g.dart file isn't getting generated:

// 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.

// ignore_for_file: public_member_api_docs

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

part 'shell_route_example.g.dart';

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

class App extends StatelessWidget {
  App({super.key});

  @override
  Widget build(BuildContext context) => MaterialApp.router(
        routerConfig: _router,
      );

  final GoRouter _router = GoRouter(routes: $appRoutes);
}

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

  @override
  Widget build(BuildContext context) => Scaffold(
    appBar: AppBar(title: const Text('foo')),
  );
}

@TypedShellRoute<MyShellRouteData>(
  routes: <TypedRoute<RouteData>>[
    TypedGoRoute<FooRouteData>(path: '/foo'),
    TypedGoRoute<BarRouteData>(path: '/bar'),
  ],
)
class MyShellRouteData extends ShellRouteData {
  const MyShellRouteData();

  @override
  Widget builder(
    BuildContext context,
    GoRouterState state,
    Widget navigator,
  ) {
    return MyShellRouteScreen(child: navigator);
  }
}

class FooRouteData extends GoRouteData {
  const FooRouteData();

  @override
  Widget build(BuildContext context, GoRouterState state) {
    return const FooScreen();
  }
}

class BarRouteData extends GoRouteData {
  const BarRouteData();

  @override
  Widget build(BuildContext context, GoRouterState state) {
    return const BarScreen();
  }
}

class MyShellRouteScreen extends StatelessWidget {
  const MyShellRouteScreen({required this.child, super.key});

  final Widget child;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      bottomNavigationBar: BottomNavigationBar(
        items: const <BottomNavigationBarItem>[
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'Foo',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.business),
            label: 'Bar',
          ),
        ],
        onTap: (int index) {
          switch (index) {
            case 0:
              // const FooRouteData().go(context);
              break;
            case 1:
              // const BarRouteData().go(context);
              break;
          }
        },
      ),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return const Text('Foo');
  }
}

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

  @override
  Widget build(BuildContext context) {
    return const Text('Bar');
  }
}

[chunhtai]

Hi @johnpryan Do you know what's the state of this PR?

[johnpryan]

Sorry, this isn't ready to land yet. I'm currently busy with other projects, if someone else can work on this, feel free.

The issue I mentioned in the comment above is becuase there's no generator for the ShellRoute annotation. To fix it, I think you need to wire it up in lib/go-router_builder.dart, here:

/// Supports `package:build_runner` creation and configuration of
/// `go_router`.
///
/// Not meant to be invoked by hand-authored code.
Builder goRouterBuilder(BuilderOptions options) => SharedPartBuilder(
      const <Generator>[GoRouterGenerator()],
      'go_router',
    );

so you add another GoRouterShellGenerator() or something to that array. I would also like to add more tests and a separate example for ShellRoute, similar to my comment above.

[GP4cK]

@chunhtai I created a PR https://github.com/johnpryan/flutter_packages/pull/1 against @johnpryan 's branch:

I created a GoRouterShellGenerator by duplicating the code from the GoRouterGenerator. It's exactly the same except that I just replaced TypedGoRoute with TypedShellRoute and GoRouteData with ShellRouteData. I should probably refactor it to avoid having duplicated code. I could:

1. create an abstract class named (?) which both GoRouterGenerator and GoRouterShellGenerator would implement
2. add 2 String parameters to GoRouterGenerator (typedRoute and routeData) and create the generator like this: GoRouterGenerator(typedRoute: 'TypedGoRoute', routeData: 'GoRouteData') and GoRouterGenerator(typedRoute: 'TypedShellRoute', routeData: 'ShellRouteData')
3. (?)

Based on your feedback, I'll add a test similar to the existing one for the GoRouterGenerator.

I've also squashed merged the changes from master to solve the conflicts (pubspec and changelog) but maybe I shouldn't have because now the github action added all the labels...

[chunhtai]

Hi @GP4cK thanks for helping, can you create a PR directly against the flutter:main? I will close this pr.