Wizard Router for Flutter

wizard_router provides routing for classic linear wizards in a way that it eliminates dependencies between wizard pages. Wizard pages can request the next or previous page without knowing or caring what is the next or the previous wizard page. Thus, adding, removing, or re-ordering pages does not cause changes in existing pages.

Usage

Routes

MaterialApp(
  home: Scaffold(
    body: Wizard(
      routes: {
        '/foo': WizardRoute(builder: (context) => FooPage()),
        '/bar': WizardRoute(builder: (context) => BarPage()),
        '/baz': WizardRoute(builder: (context) => BazPage()),
      },
    ),
  ),
)

Navigation

The next or the previous page is requested by calling Wizard.of(context).next() or Wizard.of(context).back(), respectively.

BarPage(
  child: ButtonBar(
    children: [
      ElevatedButton(
        onPressed: Wizard.of(context).back
        child: const Text('Back'),
      ),
      ElevatedButton(
        onPressed: Wizard.of(context).next
        child: const Text('Next'),
      ),
    ],
  ),
)

Conditions

For unconditional linear wizards, defining the routes is enough. The router follows the order the routes are defined in. If there are conditions between the wizard pages, the order can be customized with the WizardRoute.onNext and WizardRoute.onBack callbacks.

Wizard(
  routes: {
    '/foo': WizardRoute(
      builder: (context) => FooPage(),
      // conditionally skip the _Bar_ page when stepping forward from the _Foo_ page
      onNext: (settings) => skipBar ? '/baz' : null,
    ),
    '/bar': WizardRoute(builder: (context) => BarPage()),
    '/baz': WizardRoute(builder: (context) => BazPage()),
    '/qux': WizardRoute(
      builder: (context) => QuxPage(),
      // always skip the Baz page when stepping back from the Qux page
      onBack: (settings) => '/bar',
    ),
  },
)

Arguments

It is recommended to avoid such dependencies between wizard pages that make assumptions of the page order. However, sometimes it may be desirable to pass arguments to the next page. This is possible by passing them to Wizard.of(context).next(arguments). On the next page, the arguments can be queried from Wizard.of(context).arguments.

FooPage(
  onFoo: () => Wizard.of(context).next(arguments: something),
)

BarPageState extends State<BarPage>(
  @override
  void initState() {
    super.initState();

    final something = Wizard.of(context).arguments as Something;
    // ...
  }
)

Controller

The wizard can be accessed from anywhere in the widget tree by using a WizardController.

class FooPage extends StatefulWidget {
  final _controller = WizardController(
    routes: {
      '/foo': WizardRoute(builder: (context) => FooPage()),
      '/bar': WizardRoute(builder: (context) => BarPage()),
    },
  );
  
  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Wizard(controller: _controller),
        ButtonBar(
          children: [
            ElevatedButton(
              onPressed: _controller.back,
              child: const Text('Back'),
            ),
            ElevatedButton(
              onPressed: _controller.next,
              child: const Text('Next'),
            ),
          ],
        ),
      ],
    );
  }
}

Credits

wizard_router is based on flow_builder.