Incredible Flutter Navigation Package, AutoRoute

Introduction

What is AutoRoute?

It’s a Flutter navigation package, it allows for strongly-typed arguments passing, effortless deep-linking and it uses code generation to simplify routes setup, with that being said it requires a minimal amount of code to generate everything needed for navigation inside of your App.

Why AutoRoute?

If your App requires deep-linking or guarded routes or just a clean routing setup you’ll need to use named/generated routes and you’ll end up writing a lot of boilerplate code for mediator argument classes, checking for required arguments, extracting arguments and a bunch of other stuff. AutoRoute does all that for you and much more.

Installation

dependencies:        
 auto_route: [latest-version]        
       
dev_dependencies:        
 auto_route_generator: [latest-version]        
 build_runner:        

Setup And Usage

Create a placeholder class and annotate it with @MaterialAutoRouter which takes a list of routes as a required argument.

Note: Unless you want to generate a part of file (.gr.dart) The name of the router must be prefixed with $ so we have a generated class with the same name minus the $.

        
// @CupertinoAutoRouter        
// @AdaptiveAutoRouter        
// @CustomAutoRouter        
@MaterialAutoRouter(        
  replaceInRouteName: 'Page,Route',        
  routes: <AutoRoute>[        
    AutoRoute(page: BookListPage, initial: true),        
    AutoRoute(page: BookDetailsPage),        
  ],        
)        
class $AppRouter {}        

Using part builder ( New in version 3.0.0+)

To generate a part-of file instead of a stand alone AppRouter class, simply add a Part Directive to your AppRouter and extend the generated private router.

part 'app_router.gr.dart'  
  
@MaterialAutoRouter(        
  replaceInRouteName: 'Page,Route',        
  routes: <AutoRoute>[        
    AutoRoute(page: BookListPage, initial: true),        
    AutoRoute(page: BookDetailsPage),        
  ],        
)        
// extend the generated private router  
class AppRouter extends _$AppRouter{}        

Tip: You can Shorten auto-generated route names from e.g. BookListPageRoute to BookListRoute using the replaceInRouteName argument.

Now simply run the generator

Use the [watch] flag to watch the files’ system for edits and rebuild as necessary.

flutter packages pub run build_runner watch        

if you want the generator to run one time and exits use

flutter packages pub run build_runner build        

Finalize the setup

after you run the generator your router class will be generated, hook it up with MaterialApp.

// assuing this is the root widget of your App     
class App extends StatlessWidget{    
  // make sure you don't initiate your router    
  // inside of the build function.    
   final _appRouter = AppRouter();        
       
  Widget build(BuildContext context){        
      return MaterialApp.router(        
             routerDelegate:_appDelegate.delegate(),        
             routeInformationParser: _appRouter.defaultRouteParser(),        
         ),        
  }        

Generated Routes

A PageRouteInfo object will be generated for every declared AutoRoute, These objects hold path information plus strongly-typed page arguments which are extracted from the page’s default constructor. Think of them as string path segments on steroid.

class BookListRoute extends PageRouteInfo {        
  const BookListRoute() : super(name, path: '/books');        
        
  static const String name = 'BookListRoute';        
}        

if the declared route has children AutoRoute will add a children parameter to its constructor to be used in nested navigation. more on that here.

class UserRoute extends PageRouteInfo {        
   UserRoute({List<PagerouteInfo> children}) :        
    super(        
         name,         
         path: '/user/:id',        
         initialChildren: children);        
  static const String name = 'UserRoute';        
}        

Navigating Between Screens

AutoRouter offers the same known push, pop and friends methods to manipulate the pages stack using both the generated PageRouteInfo objects and paths.

// get the scoped router by calling        
AutoRouter.of(context)        
// or using the extension        
context.router        
        
// adds a new entry to the pages stack        
router.push(const BooksListRoute())      
// or by using using paths      
router.pushNamed('/books')       
    
// removes last entry in stack and pushs provided route     
// if last entry == provided route page will just be updated    
router.replace(const BooksListRoute())        
// or by using using paths      
router.replaceNamed('/books')      
    
// pops until provided route, if it already exists in stack        
// else adds it to the stack (good for web Apps).        
router.navigate(const BooksListRoute())      
// or by using using paths      
router.navigateNamed('/books')    
  
// on Web it calls window.history.back();
// on Native it navigates you back 
// to the previous location
router.navigateBack();

// adds a list of routes to the pages stack at once    
router.pushAll([    
   BooksListRoute(),    
   BookDetailsRoute(id:1),    
]);    
    
// This's like providing a completely new stack as it rebuilds the stack    
// with the list of passed routes    
// entires might just update if alright exist    
router.replaceAll([    
   LoginRoute()    
]);    
// pops the last page unless stack has 1 entry        
context.router.pop();       
// keeps poping routes until predicate is satisfied    
context.router.popUntil((route) => route.name == 'HomeRoute');    
// a simplifed version of the above line    
context.router.popUntilRouteWithName('HomeRoute');    
// pops all routes down to the root    
context.router.popUntilRoot();    
         
// removes the top most page in stack even if it's the last    
// remove != pop, it doesn't respect WillPopScopes it just     
// removes the entry.    
context.router.removeLast();     
    
// removes any route in stack that satisfis the predicate    
// this works exactly like removing items from a regualar List    
// <PageRouteInfo>[...].removeWhere((r)=>)    
context.router.removeWhere((route) => );    
        
// you can also use the common helper methods from context extension to navigate    
context.pushRoute(const BooksListRoute());    
context.replaceRoute(const BooksListRoute());    
context.navigateTo(const BooksListRoute());    
context.navigateNamedTo('/books');    
context.navigateBack();   
context.popRoute();    

Passing Arguments

That’s the fun part! AutoRoute automatically detects and handles your page arguments for you, the generated route object will deliver all the arguments your page needs including path/query params.

e.g. The following page widget will take an argument of type Book.

class BookDetailsPage extends StatelessWidget {        
 const BookDetailsRoute({required this.book});        
        
  final Book book;     
  ...        

Note: Default values are respected. Required fields are also respected and handled properly.

The generated BookDetailsRoute will deliver the same arguments to it’s corresponding page.

router.push(BookDetailsRoute(book: book));        

Note: all args are generated as named parameters regardless of their original type.

Returning Results

You can return results by either using the pop completer or by passing a callback function as an argument the same way you’d pass an object.

1 – Using the pop completer

var result = await router.push(LoginRoute());        

then inside of your LoginPage pop with results

router.pop(true);       

as you’d notice we did not specify the result type, we’re playing with dynamic values here, which can be risky and I personally don’t recommend it.

To avoid working with dynamic values we specify what type of results we expect our page to return, which is a bool value.

AutoRoute<bool>(page: LoginPage),     

we push and specify the type of results we’re expecting

var result = await router.push<bool>(LoginRoute());        

and of course we pop with the same type

router.pop<bool>(true);       

2- Passing a callback function as an argument.
We only have to add a callback function as a parameter to our page constructor like follows:

class BookDetailsPage extends StatelessWidget {        
 const BookDetailsRoute({this.book, required this.onRateBook});        
        
  final Book book;        
  final void Function(int) onRateBook;        
  ...        

The generated BookDetailsRoute will deliver the same arguments to it’s corresponding page.

context.router.push(        
      BookDetailsRoute(        
          book: book,        
          onRateBook: (rating) {        
           // handle result        
          }),        
    );        

if you’re finishing with results make sure you call the callback function as you pop the page

onRateBook(RESULT);        
context.router.pop();        

Note: Default values are respected. Required fields are also respected and handled properly.

Nested Navigation

Nested navigation means building an inner router inside of a page of another router, for example in the below diagram users page is built inside of dashboard page.

defining nested routes is as easy as populating the children field of the parent route. In the following example UsersPage , PostsPage and SettingsPage are nested children of DashboardPage.

@MaterialAutoRouter(        
  replaceInRouteName: 'Page,Route',        
  routes: <AutoRoute>[        
    AutoRoute(        
      path: '/dashboard',        
      page: DashboardPage,        
      children: [        
        AutoRoute(path: 'users', page: UsersPage),        
        AutoRoute(path: 'posts', page: PostsPage),    
        AutoRoute(path: 'settings', page: SettingsPage),          
      ],        
    ),    
    AutoRoute(path: '/login', page: LoginPage)    
  ],        
)        
class $AppRouter {}        

To render/build nested routes we need an AutoRouter widget that works as an outlet or a nested router-view inside of our dashboard page.

class DashboardPage extends StatelessWidget {    
  @override    
  Widget build(BuildContext context) {    
    return Row(    
      children: [    
        Column(    
          children: [    
            NavLink(label: 'Users', destination: const UsersRoute()),    
            NavLink(label: 'Posts', destination: const PostsRoute()),    
            NavLink(label: 'Settings', destination: const SettingsRoute()),    
          ],    
        ),    
        Expanded(    
          // nested routes will be rendered here    
          child: AutoRouter(),    
        )    
      ],    
    );    
  }    
}    

Now if we navigate to /dashboard/users we will be taken to the DashboardPage and the UsersPage will be shown inside of it.

What if want to show one of the child pages at /dashboard? we can simply do that by giving the child routes an empty path '' or set it as initial.

   AutoRoute(        
      path: '/dashboard',        
      page: UserPage,        
      children: [        
        AutoRoute(path: '', page: UsersPage),    
        //The same thing can be done using the initial flag    
        //AutoRoute(page: UsersPage,initial: true),        
        AutoRoute(path: 'posts', page: PostsPage),        
      ],        
    ),        

or by using a RedirectRoute

	AutoRoute(        
	path: '/dashboard',        
	page: UserPage,        
		children: [        
			RedirectRoute(path: '', redirectTo: 'users'),        
			AutoRoute(path: 'users', page: UsersPage),        
			AutoRoute(path: 'posts', page: PostsPage),         
		],        
	),  

which can be simplified to the following where auto_route generates the redirect code for you.

   AutoRoute(        
      path: '/dashboard',        
      page: UserPage,        
      children: [        
        // RedirectRoute(path: '', redirectTo: 'users'),        
        AutoRoute(path: 'users', page: UsersPage, initial: true),        
        AutoRoute(path: 'posts', page: PostsPage),         
      ],        
    ),        

Things to keep in mind when implementing nested navigation

1- Each router manages it’s own pages stack.
2- Navigation actions like push, pop and friends are handled by the topmost router and bubble up if it couldn’t be handled.

Tab Navigation

If you’re working with flutter mobile you’re most likely to implement tabs navigation, that’s why auto_route makes tabs navigation as easy and straightforward as possible.

in the previous example we used an AutoRouter widget to render nested child routes, AutoRouter is just a shortcut for AutoStackRouter, StackRouters manage a stack of pages inside of them where the active/visible page is always the one on top and you’d need to pop it to see the page beneath it.

Now we can try to implement our tabs using an AutoRouter (StackRouter) by pushing or replacing a nested route every-time the tab changes and that might work but our tabs state will be lost, not to mention the transition between tabs issues, luckily auto_route comes equipped with an AutoTabsRouter which is especially made to handle tab navigation.

AutoTabsRouter lets you switch between different routes while preserving offstage-routes state, tab routes are lazily loaded by default ( can be disabled ) and finally it allows to create whatever transition animation you want.

Let’s change the previous example to use tab navigation.

Notice that we’re not going to change anything in our routes declaration map, we still have a dashboard page that has tree nested children, users, posts and settings.

class DashboardPage extends StatelessWidget {    
  @override    
  Widget build(BuildContext context) {    
    return AutoTabsRouter(    
    // list of your tab routes    
    // routes used here must be declaraed as children    
    // routes of /dashboard     
      routes: const [    
        UsersRoute(),    
        PostsRoute(),    
        SettingsRoute(),    
      ],    
      builder: (context, child, animation) {    
        // obtain the scoped TabsRouter controller using context    
        final tabsRouter = AutoTabsRouter.of(context);    
        // Here we're building our Scaffold inside of AutoTabsRouter    
        // to access the tabsRouter controller provided in this context    
        //     
        //alterntivly you could use a global key    
        return Scaffold(    
            body: FadeTransition(    
              opacity: animation,    
              // the passed child is techinaclly our animated selected-tab page    
              child: child,    
            ),    
            bottomNavigationBar: BottomNavigationBar(    
              currentIndex: tabsRouter.activeIndex,    
              onTap: (index) {    
                // here we switch between tabs    
                tabsRouter.setActiveIndex(index);    
              },    
              items: [    
                BottomNavigationBarItem(label: 'Users',...),    
                BottomNavigationBarItem(label: 'Posts',...),    
                BottomNavigationBarItem(label: 'Settings',...),    
              ],    
            ));    
      },    
    );    
  }    
}    

if you think the above setup is a bit messy you could use the shipped-in AutoTabsScaffold that makes things much cleaner.

class DashboardPage extends StatelessWidget {    
    
 @override      
Widget build(context) {      
 @override    
  Widget build(context) {    
    return AutoTabsScaffold(    
       routes: const [    
        UsersRoute(),    
        PostsRoute(),    
        SettingsRoute(),    
      ],    
      bottomNavigationBuilder: (_,tabsRouter) {    
          return BottomNavigationBar(    
              currentIndex: tabsRouter.activeIndex,    
              onTap: tabsRouter.setActiveIndex    
              items: [    
                BottomNavigationBarItem(label: 'Users',...),    
                BottomNavigationBarItem(label: 'Posts',...),    
                BottomNavigationBarItem(label: 'Settings',...),    
              ],    
            )),           
       }    
    );    
}    

Finding The Right Router

Every nested AutoRouter has its own routing controller to manage the stack inside of it and the easiest way to obtain a scoped controller is by using context.

In the previous example DashboardPage is a root level stack entry so calling AutoRouter.of(context) anywhere inside of it will get us the root routing controller.

AutoRouter widgets that are used to render nested routes, insert a new router scope into the widgets tree, so when a nested route calls for the scoped controller they will get the closest parent controller in the widgets tree not the root controller.

class Dashboard extends StatelessWidget {        
       
  @override        
  Widget build(BuildContext context) {        
  // this will get us the root routing controller        
    AutoRouter.of(context);        
    return Scaffold(        
      appBar: AppBar(title: Text('Dashboard page')),         
      // this inserts a new router scope into the widgets tree        
      body: AutoRouter()         
    );        
  }        
}        

Here’s a simple diagram to help visualize this

As you can tell from the above diagram it’s possible to access parent routing controllers by calling router.parent<T>(), we’re using a generic function because we have too different routing controllers StackRouter and TabsRouter, one of them could be the parent controller of the current router and that’s why we need to specify a type.

router.parent<StackRouter>() // this returns  the parent router as a Stack Routing controller        
router.parent<TabsRouter>() // this returns athe parent router as a Tabs Routing controller        

on the other hand obtaining the root controller does not require type casting because it’s always a StackRouter.

router.root // this returns the root router as a Stack Routing controller        

You can obtain access to inner-routers from outside their scope using a global key

class DashboardPage extends StatefulWidget {    
  @override    
  _DashboardPageState createState() => _DashboardPageState();    
}    
    
class _DashboardPageState extends State<DashboardPage> {    
  final _innerRouterKey = GlobalKey<AutoRouterState>();    
  @override    
  Widget build(BuildContext context) {    
    return Row(    
      children: [    
        Column(    
          children: [    
            NavLink(label: 'Users',    
            onTap:(){    
               final router = _innerRouterKey.currentState?.controller;    
               router?.push(const UsersRoute());    
             }    
            ),    
            ...    
          ],    
        ),    
        Expanded(    
          child: AutoRouter(key: _innerRouterKey),    
        )    
      ],    
    );    
  }    
}    

You could also obtain access to inner-routers from outside their scope without a global key as long as they’re initiated.

// assuming this's the root router        
context.innerRouterOf<StackRouter>(UserRoute.name)         
// or if we're usign an AutoTabsRouter inside of DashboardPage    
context.innerRouterOf<TabsRouter>(UserRoute.name)      

Accessing the DashboardPage inner router from the previous example.

class Dashboard extends StatelessWidget {        
      
  @override        
  Widget build(BuildContext context) {        
    return Scaffold(        
      appBar: AppBar(        
        title: Text('Dashboard'),        
        actions: [        
          IconButton(        
            icon: Icon(Icons.person),        
            onPressed: () {        
              // accessing the inner router from        
              // outside the scope        
              final router = context.innerRouterOf<StackRouter>(DashboardRoute.name)    
              router?.push(const UsersRoute());        
            },        
          ),        
        ],        
      ),        
      body: AutoRouter(), // we're trying to get access to this        
    );        
  }        
}        

Navigating Without Context

To navigate without context you can simply assign your generated router to a global variable

// declerate your route as a global vairable    
final appRouter = AppRouter();      
    
class MyApp extends StatefulWidget {    
    
  @override    
  Widget build(BuildContext context) {    
    return MaterialApp.router(    
      routerDelegate: AutoRouterDelegate(appRouter),    
      routeInformationParser: appRouter.defaultRouteParser(),    
      );    
    }    

Note: using global variable is not recommended and is considered a bad practice and most of the times you should use dependency injection instead.

Here’s an example using get_it which is just a personal favorite, you can use any dependency injection package you like.

void main(){    
// make sure you register it as a Singleton or a lazySingleton    
  getIt.registerSingleton<AppRouter>(AppRouter());    
  runApp(MyApp());    
 }    
    
class MyApp extends StatefulWidget {    
  @override    
  Widget build(BuildContext context) {    
    final router = getIt<AppRouter>();    
    return MaterialApp.router(    
      routerDelegate: AutoRouterDelegate(router),    
      routeInformationParser: router.defaultRouteParser(),    
      );    
    }    

now you can access to your router anywhere inside of your App without using context.

getIt<AppRouter>().push(...);    

Note: navigating without context is not recommended in nested navigation.

Working with Paths

Working with paths in AutoRoute is optional because PageRouteInfo objects are matched by name unless pushed as a string using the initialDeepLink property in root delegate or pushNamed, replaceNamed navigateNamed methods.

if you don’t specify a path it’s going to be generated from the page name e.g. BookListPage will have ‘book-list-page’ as a path, if initial arg is set to true the path will be / unless it’s relative then it will be an empty string ''.

When developing a web Application or a native App that requires deep-linking you’d probably need to define paths with clear memorable names, and that’s done using the path argument in AutoRoute.

 AutoRoute(path: '/books', page: BookListPage),        

Path Parameters (dynamic segments)

You can define a dynamic segment by prefixing it with a colon

 AutoRoute(path: '/books/:id', page: BookDetailsPage),        

The simplest way to extract path parameters from path and gain access to them is by annotating constructor params with @PathParam('optional-alias') with the same alias/name of the segment.

class BookDetailsPage extends StatelessWidget {        
  const BookDetailsPage({@PathParam('id') this.bookId});    
      
  final int bookId;        
  ...        

Now writing /books/1 in the browser will navigate you to BookDetailsPage and automatically extract the bookId argument from path and inject it to your widget.

Query Parameters

Query parameters are accessed the same way, simply annotate the constructor parameter to hold the value of the query param with @QueryParam('optional-alias') and let AutoRoute do the rest.

you could also access path/query parameters using the scoped RouteData object.

 RouteData.of(context).pathParams;        
 // or using the extension        
 context.routeData.queryParams        

Tip: if your parameter name is the same as the path/query parameter, you could use the const @pathParam or @queryParam and not pass a slug/alias.

class BookDetailsPage extends StatelessWidget {        
  const BookDetailsPage({@pathParam this.id});    
      
  final int id;        
  ...        

Redirecting Paths

Paths can be redirected using RedirectRoute. The following setup will navigate us to /books when / is matched.

<AutoRoute> [        
     RedirectRoute(path: '/', redirectTo: '/books'),        
     AutoRoute(path: '/books', page: BookListPage),        
 ]        

When redirecting initial routes the above setup can be simplified by setting the /books path as initial and auto_route will automatically generate the required redirect code for you.

<AutoRoute> [          
     AutoRoute(path: '/books', page: BookListPage, initial: true),        
 ]        

Note: RedirectRoutes are fully matched.

Wildcards

auto_route supports wildcard matching to handle invalid or undefined paths.

AutoRoute(path: '*', page: UnknownRoutePage)        
// it could be used with defined prefixes        
AutoRoute(path: '/profile/*', page: ProfilePage)        
// or it could be used with RedirectRoute        
RedirectRoute(path: '*', redirectTo: '/')        

Note: be sure to always add your wildcards at the end of your route list because routes are matched in order.

Route Guards

Think of route guards as middleware or interceptors, routes can not be added to the stack without going through their assigned guards, guards are useful for restricting access to certain routes.

We create a route guard by extending AutoRouteGuard from the auto_route package
and implementing our logic inside of the onNavigation method.

class AuthGuard extends AutoRouteGuard {    
 @override    
 void onNavigation(NavigationResolver resolver, StackRouter router) {    
 // the navigation is paused until resolver.next() is called with either     
 // true to resume/continue navigation or false to abort navigation    
     if(authenitcated){    
       // if user is authenticated we continue    
        resolver.next(true);    
      }else{    
         // we redirect the user to our login page    
         router.push(LoginRoute(onResult: (success){    
                // if success == true the navigation will be resumed    
                // else it will be aborted    
               resolver.next(success);    
          }));    
         }        
     }    
}    
    

Important: resolver.next() should only be called once.

The NavigationResolver object contains the guarded route which you can access by calling the property resolver.route and a list of pending routes (if there are any) accessed by calling resolver.pendingRoutes.

Now we assign our guard to the routes we want to protect.

 AutoRoute(page: ProfileScreen, guards: [AuthGuard]);    

After we run code generation, our router will have a required named argument called authGuard or whatever your guard name is

// we pass our AuthGuard to the generated router.    
final _appRouter = AppRouter(authGuard: AuthGuard());    

Wrapping Routes

In some cases we want to wrap our screen with a parent widget usually to provide some values through context, e.g wrapping your route with a custom Theme or a Provider, to do that simply implement AutoRouteWrapper, and have wrappedRoute(context) method return (this) as the child of your wrapper widget.

class ProductsScreen extends StatelessWidget implements AutoRouteWrapper {    
  @override    
  Widget wrappedRoute(BuildContext context) {    
  return Provider(create: (ctx) => ProductsBloc(), child: this);    
  }    
  ...    

Navigation Observers

Navigation observers are used to observe when routes are pushed ,replaced or popped ..etc.

We implement an AutoRouter observer by extending an AutoRouterObserver which is just a NavigatorObserver with tab route support.

class MyObserver extends AutoRouterObserver {    
  @override    
  void didPush(Route route, Route? previousRoute) {    
    print('New route pushed: ${route.settings.name}');    
  }    
 ...    
 // only override to observer tab routes    
 @override    
  void didInitTabRoute(TabPageRoute route, TabPageRoute? previousRoute) {    
    print('Tab route visited: ${route.name}');    
  }    
  @override    
  void didChangeTabRoute(TabPageRoute route, TabPageRoute previousRoute) {    
    print('Tab route re-visited: ${route.name}');    
  }    
  ...    
}    

Then we pass our observer to the root delegate AutoRouterDelegate.
Important notice that navigatorObservers property is a builder function that returns a list of observes and the reason for that is a navigator observer instance can only be used by a single router, so unless you’re using a one single router or you don’t want your nested routers to inherit observers make sure navigatorObservers builder always returns fresh observer instances.

   return MaterialApp.router(    
      routerDelegate: AutoRouterDelegate(    
        _appRouter,    
        navigatorObservers: () => [MyObserver()],    
      ),    
      routeInformationParser: _appRouter.defaultRouteParser(),    
    );    

the following approach won’t work if you have nested routers unless they don’t inherit the observers.

   final _observer = MyObserver();    
   return MaterialApp.router(    
      routerDelegate: AutoRouterDelegate(    
        _appRouter,    
        // this should always return new instances    
        navigatorObservers: () => [_observer],    
      ),    
      routeInformationParser: _appRouter.defaultRouteParser(),    
    );    

Every nested router can have it’s own observers and inherit it’s parent’s.

 AutoRouter(    
    inheritNavigatorObservers: true, // true by default    
    navgiatorObservers:()=> [list of observers]);    
        
 AutoTabsRouter(    
    inheritNavigatorObservers: true, // true by default    
    navgiatorObservers:()=> [list of observers]);    

We can also make a certain screen route aware by subscribing to an AutoRouteObserver ( Route not Router).

First we provide our AutoRouteObserver instance

   return MaterialApp.router(    
      routerDelegate: AutoRouterDelegate(    
        _appRouter,    
       // Provide an AutoRouteObserver instance    
        navigatorObservers: () => [AutoRouteObserver()],    
      ),    
      routeInformationParser: _appRouter.defaultRouteParser(),    
    );    

Next we use an AutoRouteAware mixin which is a RouteAware mixin with tab support to provided the needed listeners then subscribe to our AutoRouteObserver.

class BooksListPage extends State<BookListPage> with AutoRouteAware {    
   AutoRouteObserver? _observer;    
       
  @override    
  void didChangeDependencies() {    
    super.didChangeDependencies();    
    // RouterScope exposes the list of provided observers    
    // including inherited observers    
   _observer = RouterScope.of(context).firstObserverOfType<AutoRouteObserver>();    
    if (_observer != null) {    
      // we subscribe to the observer by passing our    
      // AutoRouteAware state and the scoped routeData    
      _observer.subscribe(this, context.routeData);    
    }    
  }    
      
 @override    
  void dispose() {    
    super.dispose();    
    // don't forget to unsubscribe from the    
    // observer on dispose    
    _observer.unsubscribe(this);    
  }    
    
 // only override if this is a tab page    
   @override    
   void didInitTabRoute(TabPageRoute? previousRoute) {}    
    
 // only override if this is a tab page    
   @override    
   void didChangeTabRoute(TabPageRoute previousRoute) {}    
    
   @override    
   void didPopNext() {}    
    
   @override    
   void didPushNext() {}    
    
   @override    
   void didPush() {}    
    
   @override    
   void didPop() {}    
}    

Customizations

MaterialAutoRouter | CupertinoAutoRouter | AdaptiveAutoRouter

CustomAutoRouter

MaterialRoute | CupertinoRoute | AdaptiveRoute | CustomRoute

CupertinoRoute Specific => CupertinoPageRoute

CustomRoute Specific => PageRouteBuilder

Custom Route Transitions

To use custom route transitions use a CustomRoute and pass in your preferences.
The TransitionsBuilder function needs to be passed as a static/const reference that has the same signature as the TransitionsBuilder function of the PageRouteBuilder class.

CustomRoute(    
page: LoginScreen,    
//TransitionsBuilders class contains a preset of common transitions builders.     
transitionsBuilder: TransitionBuilders.slideBottom,    
durationInMilliseconds: 400)    

Tip Use @CustomAutoRouter() to define global custom route transitions.

You can of course use your own transitionsBuilder function as long as it has the same function signature.
The function has to take in exactly a BuildContext, Animation<Double>, Animation<Double> and a child Widget and it needs to return a Widget, typically you would wrap your child with one of flutter’s transition widgets as follows.

Widget zoomInTransition(BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation, Widget child) {    
 // you get an animation object and a widget    
 // make your own transition    
    return ScaleTransition(scale: animation, child: child);    
  }    

Now pass the reference of your function to CustomRoute .

CustomRoute(page: ZoomInScreen, transitionsBuilder: zoomInTransition)    

Custom Route Builder

You can use your own custom route by passing a CustomRouteBuilder function to CustomRoute, there isn’t a simple way to strongly-type a static function in code generation, so make sure your custom builder signature matches the following.

typedef CustomRouteBuilder = Route<T> Function<T>(      
  BuildContext context, Widget child, CustomPage page);    

Now we implement our builder function the same way we did with the TransitionsBuilder function,
the most important part here is passing the page argument to our custom route.

Route<T> myCustomRouteBuilder<T>(BuildContext context, Widget child, CustomPage<T> page){      
  return PageRouteBuilder(      
  fullscreenDialog: page.fullscreenDialog,      
  // this is important      
  settings: page,      
  pageBuilder: (,__,___) => child);      
}    

We finish by passing a reference of our custom function to our CustomRoute.

CustomRoute(page: CustomPage, customRouteBuilder: myCustomRouteBuilder)    

Support auto_route

You can support auto_route by liking it on Pub and staring it on Github, sharing ideas on how we can enhance a certain functionality or by reporting any problems you encounter and of course buying a couple coffees will help speed up the development process.

GitHub

Source Code: AutoRoute.