navigation_builder

This package was original a part of navigation_builder package. As requested by many users, I extract it to its own independent package.

Coming from 'navigation_builder', all you need to do is to:

use NavigationBuilder.create instead of NavigationBuilder.create

Setting Navigator (The global Picutre)

To set navigator 2 you only need to define a global NavigationBuilder final variable and use MaterialApp.router or CupertinoApp.router widgets like this:

final myNavigator = NavigationBuilder.create(
  // Put your route map here
  routes: {
    ... 
  },
  onNavigate: (RouteData data) {
    // Optional 
  },
  onNavigateBack: (RouteData data) {
    // Optional   
  }
);

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp.router(
      routerConfig: myNavigator.routerConfig,
    );
  }
}

To navigate imperatively: (Imperative in the look but declarative in behind the scene)

myNavigator.to('/page1');
myNavigator.to('/page1', arguments: 'myArgument', queryParams: {'id':'1'});
myNavigator.toReplacement('/page1');
myNavigator.toAndRemoveUntil('/page2', untilRouteName: '/page1');
myNavigator.toDeeply('/page1');

myNavigator.routeData; // Get information of the current route
myNavigator.canPop;
myNavigator.pageStack; // get the route stack

myNavigator.back();
myNavigator.forceBack();
myNavigator.backAndToNamed('/page1');
myNavigator.backUntil('/page1');

To navigate declaratively:

myNavigator.onNavigate();
myNavigator.removePage('/page1');
myNavigator.setRouteStack(
  (pages){
    // exposes a copy of the current route stack
    return [...newPagesList];
  }
)

To navigate to pageless routes, show dialogs and snackBars without BuildContext:
```
myNavigator.toPageless(MyPageWidget());
```

TO show dialogs and bottomSheets:

myNavigator.toDialog(Dialog());
myNavigator.toCupertinoDialog(CupertinoAlertDialog());
myNavigator.toBottomSheet(MyWidget());
myNavigator.toCupertinoModalPopup(MyWidget());

TO show Scaffold related popups:

myNavigator.scaffold.showSnackBar(SnackBar());
myNavigator.scaffold.hideCurrentSnackBar();
myNavigator.scaffold.removeCurrentSnackBar();

myNavigator.scaffold.openDrawer();
myNavigator.scaffold.closeDrawer();
myNavigator.scaffold.openEndDrawer();
myNavigator.scaffold.closeEndDrawer();

myNavigator.scaffold.showMaterialBanner(MaterialBanner());
myNavigator.scaffold.hideCurrentMaterialBanner();
myNavigator.scaffold.removeCurrentMaterialBanner();

myNavigator.scaffold.showBottomSheet(MyWidget());

TO Mock the NavigationBuilder for test:
```
  myNavigator.injectMock(mock);
```

For more simple and practical examples of navigation, please refer to the navigation's set of examples

  final NavigationBuilder myNavigator = NavigationBuilder.create(
     // Define your routes map
     routes: {
       '/': (RouteData data) => Home(),
        // redirect all paths that starts with '/home' to '/' path
       '/home/*': (RouteData data) => data.redirectTo('/'),
       '/page1': (RouteData data) => Page1(),
       '/page1/page11': (RouteData data) => Page11(),
       '/page2/:id': (RouteData data) {
         // Extract path parameters from dynamic links
         final id = data.pathParams['id'];
         // Or inside Page2 you can use `context.routeData.pathParams['id']`
         return Page2(id: id);
        },
       '/page3/:kind(all|popular|favorite)': (RouteData data) {
         // Use custom regular expression
         final kind = data.pathParams['kind'];
         return Page3(kind: kind);
        },
       '/page4': (RouteData data) {
         // Extract query parameters from links
         // Ex link is `/page4?age=4`
         final age = data.queryParams['age'];
         // Or inside Page4 you can use `context.routeData.queryParams['age']`
         return Page4(age: age);
        },
        '/page5/bookId': (RouteData data) {
          // As deep link can have data out of boundary.
          try {
            final bookId = data.queryParams['bookId'];
            final book = books[int.parse(bookId)];
            return Page5(book: book);
          } catch {
            // bookId can be a non valid number or it can be greater than books length.
            // Dispay the unknownRoute widget
            return data.unknownRoute;
          }
        },
        // Using sub routes
        '/page6': (RouteData data) => RouteWidget(
              builder: (Widget routerOutlet) {
                return MyParentWidget(
                  child: routerOutlet;
                  // Or inside MyParentWidget you can use `context.routerOutlet`
                )
              },
              routes: {
                '/': (RouteData data) => Page6(),
                '/page51': (RouteData data) => Page61(),
              },
            ),
     },
   );

The first parameter is routes which is of type Map<String, Widget Function(RouteData)>.

The map entries of the routes parameter can be:

Simple routes such as:

    '/': (RouteData data) => Home(),
    '/page1': (RouteData data) => Page1(),

Simple nested routes:

    '/': (RouteData data) => Home(),
    '/page1': (RouteData data) => Page1(),
    '/page1/page11': (RouteData data) => Page11(),
    '/page1/page11/page111': (RouteData data) => Page111(),
    '/page1/page11/page111/page1111': (RouteData data) => Page1111(),

When the app first starts and if the initial location is set to /page1/page11/page111/page1111, the route stack will hold ['/', '/page1', '/page1/page11', '/page1/page11/page111', '/page1/page11/page111/page111']. That is, the five pages are inflated on top of each other.

But if you are in page '/' and you navigate to /page1/page11/page111/page1111 using myNavigator.to method, the route stack will hold only two pages: ['/', '/page1/page11/page111/page111'].

You can navigate to /page1/page11/page111/page1111 and inflate all intermediate routes using myNavigator.toDeeply. For more information see Imperative navigation .

You can simplify the routes above using RouteWidget:

    '/': (RouteData data) => Home(),
    '/page1': (RouteData data) => RouteWidget(
        routes: {
            '/': (RouteData data) => Page1(),
            '/page11': (RouteData data) => RouteWidget(
                routes: {
                    '/': (RouteData data) => Page11(),
                    '/page111': (RouteData data) => Page111(),
                    '/page111/page1111': (RouteData data) => Page1111(),
                },
            ),
        }
    ),

Both way of writing routes are equivalent.

Dynamic link routes:

    '/': (RouteData data) => Home(),
    '/books/': (RouteData data) => Books(),
    '/books/:bookId': (RouteData data) {
        final bookId = data.pathParam['bookId'];
        return BooksDetails(bookId: bookId),
        // Or just return BooksDetails() without parameters and get the book id using:
        // `context.routeData.pathParam['bookId']` inside the builder method of BooksDetails.
    },
    '/books/:bookId/authors': (RouteData data) => data.redirectTo('/authors'),
    '/authors': (RouteData data) {
        // As we are redirected here from '/books/:bookId/authors' we can get the book id.
        final bookId = data.pathParam['bookId'];

        // The location we are redirected from.
        // For example `books/1/authors`
        final redirectedFrom = data.redirectedFrom.location; 
        return Authors();
    },
    '/authors/:authorId': (RouteData data) {
        final authorId = data.pathParam['authorId'];
        return AuthorDetails();
    },

From the exposed RouteData we can get useful routing information. Let's suppose we are navigating to books/1 url:

RouteData.location: holds the current location we are navigating to. (books/1 in our example).
RouteData.path: the current resolved route path.(books/:bookId in our example).
RouteData.baseLocation: the base parent location.(/ in our example).
RouteData.pathParams: a map of extracted path parameters.({'bookId'; '1'} in our example).
RouteData.queryParams: a map of extracted query parameters.({} in our example). But if the navigation url is books/1?q=1, the queryParams equals {'q': '1'};
RouteData.redirectedFrom: the RouteData we are redirected from.(null in our example). But if we are navigating to books/1/authors we will be redirected to /authors route. From their we redirectedFrom.location will be equal to books/1/authors. SeeRedirection for more information

Custom Regular expression routes:
```
    '/page3/:kind(all|popular|favorite)': (RouteData data) {
        // Use custom regular expression
        final kind = data.pathParams['kind'];
        // Or in any child of Page3, you can use context.pathParams
        return Page3(kind: kind);
    },
```
You can pass path parameters using regular expression. /page/:name(ANY_VALID_REG_EXPRESSION) What's between parenthesis is the regular expression.

If the regular expression is invalid, the route is considered unknown.

A star (*) matches all sub paths:
- /* or just *, matches all location urls.
- /page1/*, matches all location urls that starts with /page1.

RouteWidget:
RouteWidget is used for multiple reasons:

For organization: Let's take this routes map:

routes: {
       '/': (RouteData data) => Home(),
       '/page1': (RouteData data) => Page1(),
       '/page1/page11': (RouteData data) => Page11(),
       '/page1/page11/page111': (RouteData data) => Page111(),
       '/page1/page11/page111/page1111': (RouteData data) => Page1111(),
}

You can simplify the routes above using RouteWidget:

routes: {
    '/': (RouteData data) => Home(),
    // '/page1' is considered the route name of this sub route.
    '/page1': (RouteData data) => RouteWidget(
        routes: {
            // '/' here means the home page of '/page1' route, which is '/page1'
            '/': (RouteData data) => Page1(),
            '/page11': (RouteData data) => RouteWidget(
                routes: {
                    '/': (RouteData data) => Page11(),
                    '/page111': (RouteData data) => Page111(),
                    '/page111/page1111': (RouteData data) => Page1111(),
                },
            ),
        }
    ),
}

Both way of writing routes are equivalent.

For custom page transition animation: You can dedicate a particular page transition to a specified route.

final myNavigator = NavigationBuilder.create(
  // Default transition
  transitionDuration: RM.transitions.leftToRight(),
  routes: {
    '/': (_) => HomePage(),
    '/Page1': (_) => RouteWidget(
          builder: (_) => Page1(),
          // You can use one of the predefined transitions
          transitionsBuilder: (context, animation, secondaryAnimation, child) {
            // Custom transition implementation
            return ...;
          },
        ),
    '/page2': (_) => Page2(),
  },
);

pages '/' and '/page2' will use the default transition whereas '/page1' will use its own defined custom page transition. See Page transition animation section for detailed information.

For sub routes (nested routes):

    // '/page5' is the name of the sub route
    '/page5': (RouteData data) => RouteWidget(
      builder: (Widget routerOutlet) {
        return MyParentWidget(
          child: routerOutlet;
          // Or inside MyParentWidget you can use `context.routerOutlet`
        )
      },
      routes: {
        '/': (RouteData data) => Page5(),
        '/page51': (RouteData data) => Page51(),
      },
    ),

Each sub route has its own stack of pages. The builder method is used to wrap the route outlet inside another widget. Only the outlet widget will be animated on page transition. See Nested routes for more information.

To navigate imperatively:

myNavigator.to('/page1');
myNavigator.toReplacement('/page1', argument: 'myArgument');
myNavigator.toAndRemoveUntil('/page1', queryParam: {'id':'1'});
myNavigator.back();
myNavigator.backUntil('/page1');
myNavigator.removePage('/page1');

To navigate declaratively:

myNavigator.setRouteStack(
  (pages){
    // exposes a copy of the current route stack
    return [...newPagesList];
  }
)

To navigate to pageless routes, show dialogs and snackBars without BuildContext:

myNavigator.toPageless(HomePage());
myNavigator.to(HomePage());

myNavigator.toDialog(AlertDialog( ... ));
myNavigator.back();// TO close the dialog


// set the BuildContext that will be used to find the scaffold.
myNavigator.scaffold.context= context; 
myNavigator.scaffold.snackbar(SnackBar( ... ));
myNavigator.scaffold.showDrawer();
myNavigator.scaffold.closeDrawer();

For more information on navigation see Navigation

initialLocation

By default when the app first tarts it will route to '/'. You can change this default behavior by setting the initialLocation. Let's take this route

routes: {
    '/': (RouteData data) => Home(),
    '/page1': (RouteData data) => Page1(),
    '/page1/page11': (RouteData data) => Page11(),
    '/page1/page11/page111': (RouteData data) => Page111(),
    '/page1/page11/page111/page1111': (RouteData data) => Page1111(),
}

When the app first starts and if the initial location is set to /page1/page11/page111/page1111, the route stack will hold ['/', '/page1', '/page1/page11', '/page1/page11/page111', '/page1/page11/page111/page111']. That is, the five pages are inflated on top of each other.

The same thing happens in deep linking.

unknownRoute

By default if the location fails to resolve to any of the known routes, a 404 widget is displayed.

You can set your custom 404 widget using the parameter unknownRoute. It exposes the location url to go to.

As deep link can have data out of boundary, you can check for the validity of the extracted data and dispay the unknownRoute if data is not valid.

  final NavigationBuilder myNavigator = NavigationBuilder.create(
     routes: {
        '/': (RouteData data) => Home(),
        '/page1/bookId': (RouteData data) {
          try {
            final bookId = data.queryParams['bookId'];
            final book = books[int.parse(bookId)];
            return Page1(book: book);
          } catch {
            // bookId can be a non valid number or it can be greater than books length.
            // Dispay the unknownRoute widget
            return data.unknownRoute;
          }
        },
     },
   );

You can set the parameter ignoreUnknownRoutes to true to ignore all unknown routes and the app stays in the last known route.

  final NavigationBuilder myNavigator = NavigationBuilder.create(
    ignoreUnknownRoutes: true,
     routes: {
        '/': (RouteData data) => Home(),
        ... 
     },
   );

builder

The builder parameters is used to wrap the router outlet widget with other widgets.

In the following example the entire app is wrapped with a Scaffold that has an AppBar where the title displays the current location the app is in.

 final myNavigator = NavigationBuilder.create(
   builder: (Widget routeOutlet) {
      // If you extract this Scaffold to a Widget class, you do not
      // need to use the Builder widget
     return Scaffold(
       appBar: AppBar(
         title:Builder( // Needed only to get a child BuildContext
             builder: (context) {
               final location = context.routeData.location;
               return Text('Routing to: $location');
             },
         ),
       ),
       body: routeOutlet,
     );
   },
   routes: {
     '/': (_) => HomePage(),
     '/Page1': Page1(),
   },
 );

The builder callback exposes the route outlet widget. You can also obtain the route outlet widget in any of the child widget tree using context.routeOutlet relying of the InheritedWidget mechanism.

Notice that the NavigationBuilder is a reactive state so we can listen to it using ReactiveStatelessWidget. See NavigationBuilder reactivity.

pageBuilder

By default pages are wrapped with the appropriate MaterialPage ro CupertinoPage depending on whether you use MaterialApp.router or CupertinoApp.router. In case you want to provide your own Page implementation you can use pageBuilder parameter.

pageBuilder: (MaterialPageArgument arg) {
   return MaterialPage(
     key: arg.key,
     child: arg.child,
     name: arg.name,
     arguments: arg.arguments,
     maintainState: arg.maintainState,
     fullscreenDialog: arg.fullscreenDialog,
   );
},

The pageBuilder exposes MaterialPageArgument object.

MaterialPageArgument({
  LocalKey? key,
  required Widget child,
  String? name,
  Object? arguments,
  required bool maintainState,
  required bool fullscreenDialog,
})

shouldUseCupertinoPage

By default pages are wrapped with the appropriate MaterialPage ro CupertinoPage depending on whether you use MaterialApp.router or CupertinoApp.router.

If you want to use MaterialApp.router and wrap the pages with CupertinoPage , set shouldUseCupertinoPage to true.

You can use pageBuilder for more customization.

transitionsBuilder

By default, depending on the target platform, Flutter choses the adequate page transition animation for all routes.

You can provide you own page transition to override the default transition for all routes using transitionsBuilder

 final myNavigator = NavigationBuilder.create(
   transitionsBuilder: (context, animation, secondaryAnimation, child) {
     return // Your page transition implementation
   },
   routes: {
     ... 
   },
 );

You can also use one of the predefined transitions using RM.transitions

 final myNavigator = NavigationBuilder.create(
   transitionsBuilder: RM.transitions.leftToRight(),
   routes: {
     ... 
   },
 );

You can also force pages to transit without animation using RM.transitions.none()

 final myNavigator = NavigationBuilder.create(
   transitionsBuilder: RM.transitions.none(),
   routes: {
     ... 
   },
 );

The transitionsBuilder defined here will be use for all routes. In case you want, you have the ability to override this global behavior for a particular route or just for a particular call of navigation.See Page transition animation for detailed discussion.

transitionDuration

Define a duration for the transition animation.

onNavigate

This is a call back that fires every time a location is successfully resolved and just before navigation. You can use this callback for globule redirection.

It exposes the current state of the NavigationBuilder (RouteData).

Let's take this example:

  final myNavigator = NavigationBuilder.create(
    onNavigate: (RouteData data) {
      final toLocation = data.location;
      if (toLocation == '/homePage' && userIsNotSigned) {
        return data.redirectTo('/signInPage');
      }
      if (toLocation == '/signInPage' && userIsSigned) {
        return data.redirectTo('/homePage');
      }
      //You can also check query or path parameters
      if (data.queryParams['userId'] == '1') {
        return data.redirectTo('/superUserPage');
      }
    },
    routes: {
      '/signInPage': (RouteData data) => SignInPage(),
      '/homePage': (RouteData data) => HomePage(),
    },
  );

If the app is navigating to '/homePage' and if the user is not signed yet, the app is redirected to navigate to the sign in page.

Also if the app is navigating to '/signInPage' and if the user is already signed, the app is redirected to navigate to the home screen.

You can check for any property the RouteData exposes. Head to Redirection section for more information.

See onNavigate en action following this example.

onNavigateBack

This callback is fired every time a route is removed and the app navigate back. It can be used to prevent leaving a page unless data is validated.

 final myNavigator = NavigationBuilder.create(
   onNavigateBack: (RouteData data) {
     if(data == null){
       // onNavigateBack is called with null data when the hard back button of Android 
       // device is pressed with no page to go back to (the tack route length is one)

       // Typically here we display a dialog to let the user to choose between staying 
       // in the app or exiting

       // return true, the app exists
       // return false the app stay alive

       return false;
     }
     final backFrom = data.location;
     if (backFrom == '/SingInFormPage' && formIsNotSaved) {
       myNavigator.toDialog(
         AlertDialog(
           content: Text('The form is not saved yet! Do you want to exit?'),
           actions: [
             ElevatedButton(
               onPressed: () => myNavigator.forceBack(),
               child: Text('Yes'),
             ),
             ElevatedButton(
               onPressed: () => myNavigator.back(),
               child: Text('No'),
             ),
           ],
         ),
       );

       return false;
     }
   },
   routes: {
     '/SingInFormPage': (RouteData data) => SingInFormPage(),
     '/homePage': (RouteData data) => HomePage(),
   },
 );

Here if the app is navigating back from sign in form page and if the form is not saved yet, the back navigation is cancelled and a Dialog is popped asking for back navigation confirmation.

If the user chooses No, the app stays in the sign form page. In contrast if the user choose YES, the app is forcefully popped and both the Dialog and the sign in form page are removed from the routing stack.

Here is a working example using onNavigateBack.

debugPrintWhenRouted

If set to true, a message is printed in the console informing us about the state of the navigation.

This is the full NavigationBuilder.create API

NavigationBuilder injectNavigator({
  required Map<String, Widget Function(RouteData)> routes,
  String? initialLocation,
  Widget Function(String)? unknownRoute,
  Widget Function(Widget)? builder,
  Page<dynamic> Function(MaterialPageArgument)? pageBuilder,
  bool shouldUseCupertinoPage = false,
  Widget Function(BuildContext, Animation<double>, Animation<double>, Widget)? transitionsBuilder,
  Duration? transitionDuration,
  Redirect? Function(RouteData)? onNavigate,
  bool? Function(RouteData)? onNavigateBack,
  bool debugPrintWhenRouted = false,
  bool ignoreUnknownRoutes =false,
})

Navigation

After defining NavigationBuilder variable and setting MaterialApp.router, your app is ready for navigation witch can be done imperatively or declaratively.

Imperative navigation

To navigate imperatively, we use one of the methods defined in our NavigationBuilder object which we suppose to name myNavigator:

myNavigator.to('/page1'):
Here '/page1' route will be added on top of the route stack. If you are used to Navigator 1 API, myNavigator.to('/page1') is exactly equivalent to myNavigator.toNamed('/page1'). You still can use both with Navigator 2.
```
Future<T?> to<T extends Object?>(
  String routeName, {
  Object? arguments,
  Map<String, String>? queryParams,
  bool fullscreenDialog = false,
  bool maintainState = true,
  Widget Function(BuildContext, Animation<double>, Animation<double>, Widget)? transitionsBuilder,
})
```
You can pass arguments or queryParams to the route. You can also decide whether the route is fullscreenDialog and whether to maintainsState or not. You can also override the global page transition with the one you define here via the transitionBuilder parameter. The transitionBuilder defined here will be applied to this particular navigation call. Any further call of myNavigator.to method will use the default page transition.

You can wait for results from the push route:
```
    onPressed: ()async {
     final result = await myNavigator.to('/page1');
     //  On page `'/page1'`, if you call `myNavigator.back('This is the result')`
     print(result); // prints 'This is the result'
    }
```
This is a working example.
myNavigator.toDeeply('/page1/page11'): Deeply navigate to the given routeName. Deep navigation means that the root stack is cleaned and pages corresponding to sub paths are added to the stack. Suppose our navigator is :
```
 final myNavigator = NavigationBuilder.create(
   routes: {
     '/': (RouteData data) => HomePage(),
     '/page1': (RouteData data) => Page1(),
     '/page1/page11': (RouteData data) => Page11(),
     '/page1/page11/page111': (RouteData data) => Page111(),
   },
 );
```
On app start up, the route stack is ['/']. If we call myNavigator.to('/page1/page11/page111'), the route stack is ['/', '/page1/page11/page111']. In contrast, if we invoke myNavigator.toDeeply('/page1/page11/page111'), the route stack is ['/', '/page1', '/page1/page11', '/page1/page11/page111'].

This is a working example.

myNavigator.toReplacement('/page1'): Here '/page1' route will be added on top of the route stack and the last page will be removed. This is exactly equivalent to myNavigator.toReplacementNamed('/page1'). You still can use both with Navigator 2.

Future<T?> toReplacement<T extends Object?, TO extends Object?>(
  String routeName, {
  TO? result,
  Object? arguments,
  Map<String, String>? queryParams,
  bool fullscreenDialog = false,
  bool maintainState = true,
})

myNavigator.toAndRemoveUntil('/page1'): Here '/page1' route will be added on top of the route stack and all the previous routes until meeting the route with defined route name untilRouteName are removed. If the argument untilRouteName is not defined, all previous pages are removed. This is exactly equivalent to myNavigator.toNamedAndRemoveUntil('/page1'). You still can use both with Navigator 2.
```
Future<T?> toAndRemoveUntil<T extends Object?>(
  String newRouteName, {
  String? untilRouteName,
  Object? arguments,
  Map<String, String>? queryParams,
  bool fullscreenDialog = false,
  bool maintainState = true,
})
```
myNavigator.back(): Pop the top-most route off the route stack. You can pass a result to complete the future that had been returned from pushing the popped route. This is exactly equivalent to myNavigator.back(). You still can use both with Navigator 2.
```
void back<T extends Object>([T? result])
```

myNavigator.forceBack(): Pop the top-most route off the route stack with all pageless route associated with it and without calling onNavigateBack hook. This is exactly equivalent to myNavigator.forceBack().

void forceBack<T extends Object>([T? result])

The difference between back and forceBack: back invokes onNavigateBack hook and pops the top most route carelessly its a page or pageless route. For example, if a Dialog (a Dialog is an example pageless route) is displayed and we invoke back, only the Dialog is popped off. In Contrast forceBack does not invoke onNavigateBack hook and pops the top most page route with all pageless routes associated with it. For example, if a Dialog is displayed and we invoke forceBack, the dialog and the top most page route are popped off.

Here is an example where we want to prevent the user from leaving the from page before save data:

final myForm = RM.injectForm();

//
final myNavigator = NavigationBuilder.create(
 onNavigateBack: (RouteData data) {
   final backFrom = data.location;

   // an InjectedForm is dirty when data is modified and not saved yet
   if (backFrom == '/SingInFormPage' && myForm.isDirty) {
     myNavigator.toDialog(
       AlertDialog(
         content: Text('The form is not saved yet! Do you want to exit?'),
         actions: [
           ElevatedButton(
             // Pop off hte Dialog and exit the SingInFormPage
             onPressed: () => myNavigator.forceBack(),
             child: Text('Yes'),
           ),
           ElevatedButton(
             // Pop off hte Dialog and stay in the SingInFormPage
             onPressed: () => myNavigator.back(),
             child: Text('No'),
           ),
         ],
       ),
     );

     return false;
   }
 },
 routes: {
   '/SingInFormPage': (RouteData data) => SingInFormPage(),
   '/homePage': (RouteData data) => HomePage(),
 },
);

Here is The working example.

myNavigator.backUntil('/page1'): Navigate back and remove all the previous routes until meeting the route with defined name. This is exactly equivalent to myNavigator.backUntil('/page1').
```
void backUntil(String untilRouteName)
```

Declarative navigation

In declarative navigation you have access to a copy of the route stack and you have the freedom to return a new stack the way you like.

myNavigator.setRouteStack(
  (pages){
    // exposes a copy of the current route stack
    return [...newPagesList];
  }
)

By default the exposes copy of route stack is that of the root route stack. If you are working with nested routes, each sub route will have its own stack.

To declaratively set the stack of a sub route use the subRouteName parameter.

myNavigator.setRouteStack(
  (pages){
    // exposes a copy of the current route stack
    return [...newPagesList];
  },
  subRouteName: '/page1',
)

Here is The working example.

Pageless navigation

Here is a quote from Flutter documentation:

The section introduces the concept of Pages to the Navigator and divides the Routes managed by the Navigator into two groups: Some Routes are backed by a Page, others are not. The latter are called pageless Routes.

Push a Widget route

 myNavigator.toPageless(NextPage()); 
 myNavigator.to(NextPage());

You can specify a name to the route (e.g., "/settings"). It will be used with backUntil, toAndRemoveUntil, toAndRemoveUntil, and toNamedAndRemoveUntil.

 myNavigator.to(NextPage(), name: '/routeName');

 // calling backUntil:
myNavigator.backUntil('/routeName'); // Flutter: popUntil

Dialogs and Sheets

Dialogs when displayed are pushed into the route stack. It is for this reason, in navigation_builder, dialogs are treated as navigation:

In Flutter to show a dialog:

showDialog<T>(
    context: myNavigator.navigationContext,
    builder: (_) => Dialog(),
);

In navigation_builder to show a dialog:

myNavigator.navigationContext.toDialog(Dialog());
// To close the dialog
myNavigator.back();

For sure, navigation_builder is less boilerplate, but it is also more intuitive. In navigation_builder we make it clear that we are navigating to the dialog, so to close a dialog, we just pop it from the route stack.

So navigation_builder follows the naming convention as in Flutter SDK, with the change from show in Flutter to to in navigation_builder.

Show a material dialog:

 myNavigator.toDialog(DialogWidget()); // Flutter: showDialog
 // To close the dialog
myNavigator.back();

Show a cupertino dialog:

 myNavigator.toCupertinoDialog(CupertinoDialogWidget()); // Flutter: showCupertinoDialog
 // To close the dialog
myNavigator.back();

Show a Cupertino dialog:

 myNavigator.toBottomSheet(BottomSheetWidget()); // Flutter: showModalBottomSheet
 // To close the bottom sheet
myNavigator.back();

Show a Cupertino dialog:

 myNavigator.toCupertinoModalPopup(CupertinoModalPopupWidget()); // Flutter: showCupertinoModalPopup
 // To close the CupertinoModalPopup
myNavigator.back();

For all other dialogs, menus, bottom sheets, not mentioned here, you can use is as defined by flutter using myNavigator.navigationContext: example:

 showSearch(
     context: myNavigator.navigationContext, 
     delegate: MyDelegate(),
 )

Show bottom sheets, snackBars and drawers that depend on the Scaffold

Some side effects require a BuildContext of a scaffold child widget.

With navigation_builder to be able to display them outside the widget tree without explicitly specifying the BuildContext, we need to tell states_rebuild which BuildContext to use first.

This can be done either:

    onPressed: () {
       myNavigator.scaffold.context= context;
       myNavigator.scaffold.showBottomSheet(...);
    }

To hide or remove a SnackBar:

    onPressed: () {
        myNavigator.scaffold.hideCurrentSnackBar();
        myNavigator.scaffold.removeCurrentSnackBar();
    }

Show a persistent bottom-sheet:

 myNavigator.scaffold.showBottomSheet(BottomSheetWidget()); // Flutter: Scaffold.of(context).showBottomSheet

To close a persistent bottom-sheet :

    onPressed: () {
        myNavigator.back();
    }

Show a snackbar:

 myNavigator.scaffold.showSnackBar(SnackBarWidget()); // Flutter: Scaffold.of(context).showSnackBar

Open a drawer:

 myNavigator.scaffold.openDrawer(); // Flutter: Scaffold.of(context).openDrawer

To close a drawer :

    onPressed: () {
        myNavigator.scaffold.closeDrawer()
        // Or just call back
        myNavigator.back();
    }

Open an end drawer:

 myNavigator.scaffold.openEndDrawer(); // Flutter: Scaffold.of(context).openEndDrawer

To close a drawer :

    onPressed: () {
        myNavigator.scaffold.closeEndDrawer()
        // Or just call back
        myNavigator.back();
    }

For anything, not mentioned here, you can use the scaffoldState exposed by navigation_builder.

Head Here to see different level of page transition animation example.

Page transition animation

Pages are transited using the default Flutter animation depending on the target platform.

Page transition can be customized for there levels:

Global level transition

While defining NavigationBuilder object, you can set your custom page transition animation to be used for all route transitions.

 final myNavigator = NavigationBuilder.create(
   transitionsBuilder: (context, animation, secondaryAnimation, child) {
     return // Your page transition implementation
   },
   routes: {
     ... 
   },
 );

Route level transition

You can dedicate a particular page transition to a specific route while other routes still use the default page transition.

    final myNavigator = NavigationBuilder.create(
      // Default transition
      transitionDuration: RM.transitions.leftToRight(),
      routes: {
        '/': (_) => HomePage(),
        '/Page1': (_) => RouteWidget(
              builder: (_) => Page1(),
              // You can use one of the predefined transitions
              transitionsBuilder: (context, animation, secondaryAnimation, child) {
                  // Custom transition implementation
                return ...;
              },
            ),
        '/page2': (_) => Page2(),
      },
    );

Pages `'/'` and `'/page2'` will use the default transition whereas `'/page1'` will use its own defined custom page transition.

Navigation call level transition

You can customize the page transition for a particular navigation call:

  myNavigator.to(
    '/page1',
    transitionsBuilder: (context, animation, secondaryAnimation, child) {
      // Custom transition implementation
      return ...;
    },
  )

The defined transition here will be used once for this navigation call.Any further call of `myNavigator.to` method will use the default page transition or the route transition in case it is used.

You are free to defined the transition you want using the parameters exposed by transitionBuilder. For example:

final myNavigator = NavigationBuilder.create(
  transitionsBuilder: (context, animation, secondaryAnimation, child) {
    return FadeTransition(
      opacity: animation.drive(
        CurveTween(curve: Curves.easeIn),
      ),
      child: child,
    );
  },
  routes: {
    ...
  },
);

You can also use one of the predefined page transitions:

NavigationBuilder.transitions.bottomToUp();
NavigationBuilder.transitions.upToBottom();
NavigationBuilder.transitions.leftToRight();
NavigationBuilder.transitions.rightToLeft();
NavigationBuilder.transitions.none(); // Pages are transited instantly without animation

Other predefined page transitions can be added in the future.

Head Here to see different level of page transition animation example.

Customized primary and secondary animation

You can get the page animation and secondary animation form any page using context.animation and context.secondaryAnimation relying on InheritedWidget principle.

You can use the obtained animations to customize the incoming page animation.

Here is an example using this concept inspired form ResoCoder's tutorial, Flutter custom staggered page transition animation.

Nested routes

Redirection

Route redirection can be done in two levels, at route level and in global level.

If a route is redirected in both route and global level, the route level takes the priority over the global redirection.

Route level redirection

  final NavigationBuilder myNavigator = NavigationBuilder.create(
     // Define your routes map
     routes: {
       '/': (RouteData data) => data.redirectTo('/home'),
       '/home': (RouteData data) => Home(),
        // redirect all paths that starts with '/home' to '/home' path
       '/home/*': (RouteData data) => data.redirectTo('/home'),
       // redirect dynamic links
       '/books/:bookId/authors': (RouteData data) => data.redirectTo('/authors'),
       '/authors': (RouteData data) {
            // As we are redirected here from '/books/:bookId/authors' we can get the book id.
           final bookId = data.pathParam['bookId'];

            // The location we are redirected from.
            // For example `books/1/authors`
           final redirectedFrom = data.redirectedFrom.location; 
           // Or inside Authors widget we use context.routeData.redirectedFrom.location
           return Authors();
        },
     },
   );

From the route you are redirected to, you can obtain information about the route you are redirected from via RouteData.redirectedFrom field.

For example, from the route /books/:bookId/authors we are redirected to the /authors route. From the latter route we can get the bookId and display the author of the book.

Global redirection

Global redirections are done inside OnNavigate callBack.

  final myNavigator = NavigationBuilder.create(
    onNavigate: (RouteData data) {
      final toLocation = data.location;
      if (toLocation != '/signInPage' && userIsNotSigned) {
        return data.redirectTo('/signInPage');
      }
      if (toLocation == '/signInPage' && userIsSigned) {
        return data.redirectTo('/homePage');
      }
      //You can also check query or path parameters
      if (data.queryParams['userId'] == '1') {
        return data.redirectTo('/superUserPage');
      }
    },
    routes: {
      '/signInPage': (RouteData data) => SignInPage(),
      '/homePage': (RouteData data) => HomePage(),
    },
  );

If the user is not signed in and if he is navigating to any page other than the sign in page, he will be redirected to the sign in page.

Form the sign in page, the user must sign in first to be able to continue.

From the /signInPage page we can get the location the user is redirected from and let him navigate to it.

Here is what may the sign in method look like:

void signIn(String name, String password) async {
  final success = await repository.signIn(name, password);
  if(success){
    // Here the user is successfully signed in.
    final locationRedirectedFrom = context.routeData.redirectedFrom?.location;

    if(locationRedirectedFrom != null){
      // If the app is redirected form any location (deep link for example), it will continue navigate to it.
      myNavigator.to(locationRedirectedFrom);
    }else{
      // If the app accesses the 'signInPage' directly without redirection, it will navigate to the home page for example.
      myNavigator.to('homePage');
    }
  }
}

Here is The full example example

Cyclic redirection

Do not fear cyclic redirection. If it happens the unknownRoute is pushed.

final navigator = NavigationBuilder.create(
  routes: {
    '/': (data) => data.redirectTo('/home'),
    '/home': (data) => const HomePage(),
    // page1 redirect to itself
    '/page1': (data) => data.redirectTo('/page1'),
    // page2 redirect to page3 and page3 redirect back to page2
    '/page2': (data) => data.redirectTo('/page3'),
    '/page3': (data) => data.redirectTo('/page2'),
    // /page4 route is redirect form onNavigate callback to page5
    // and page5 redirect locally to page4
    '/page4': (data) => const PageWidget(title: 'Never Reached Page'),
    '/page5': (data) => data.redirectTo('/page4'),
  },
  onNavigate: (data) {
    final location = data.location;
    if (location == '/page4') {
      return data.redirectTo('/page5');
    }
  },
);

Here is the working example

Name		Name	Last commit message	Last commit date
Latest commit History 33 Commits
.github/workflows		.github/workflows
.vscode		.vscode
example		example
lib		lib
test		test
.gitignore		.gitignore
.metadata		.metadata
CHANGELOG.md		CHANGELOG.md
LICENSE		LICENSE
LICENSE copy		LICENSE copy
README.md		README.md
analysis_options.yaml		analysis_options.yaml
pubspec.yaml		pubspec.yaml

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Mantano/navigation_builder

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navigation_builder

Setting Navigator (The global Picutre)

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