Qlevar Router (QR)

• Qlevar Router (QR)
  • Demo
    • The example Projects
    • The Samples Project
  • Parameters
    • Path Parameters
    • Query Parameters
    • Params features
  • Middleware
    • redirectGuard
    • canPop
    • onMatch
    • onEnter
    • onExit
  • Observer
  • Not found page
  • Deferred loading
  • Page Transition
    • Mix it up
    • App Page Transition
  • Add or remove routes in run Time
  • Clean Structure
  • Declarative routing
    • QDRoute
    • How Declarative router works
  • Remove Url Hashtag
  • Web hot reload
  • Contribute

Qlevar router is a flutter package to help you with managing your project routing, navigation, deep linking, route params, etc ... With Navigator 2.0 Manage your project routes and create nested routes. Change only one widget on your page when navigating to the new route. Navigate without context from anywhere to anywhere.

// Define your routes
class AppRoutes {
  static String homePage = 'Home Page';
  static String userPage = 'User Page';
  final routes = [
    QRoute(name: homePage, path: '/', builder: () => HomePage()),   
    QRoute(
        name: userPage,
        path: '/user/:userId',
        builder: () => HomePage(),
        children: [
          QRoute(name: homePage, path: '/settings', builder: () => SettingsPage()),
          QRoute(name: homePage, path: '/profile', builder: () => ProfilePage()),
        ]),
    QRoute(path: '/products/:category(\w)', builder: () => ProductCategory()),
    QRoute(path: '/products/:id((^[0-9]\$))', builder: () => ProductDetails()),
  ];
}

// Create your app
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) => MaterialApp.router(
      routeInformationParser: QRouteInformationParser(),
      routerDelegate: QRouterDelegate(AppRoutes().routes));
}

// from anywhere in your code navigate to new page with
QR.toName(AppRoutes.userPage, param:{'userId':2});
// or
QR.to('/user/2');

QR.to('/user/6/profile')  // Here the Stack will be HomePage -> ProfilePage()
QR.to('products/456')     // Will call ProductDetails page
QR.to('products/garden')  // Will call ProductCategory page
QR.back()                 // Go back to the last page(in this case 'products/456')
QR.currentPath            // will show the current path 

you want to work with the basic functions from the navigator just set which navigator to use with QR.activeNavigatorName and then call it and use it

  QR.navigator.canPop;
  QR.navigator.currentRoute //Get the current route for this navigator

  QR.navigator.pushName(String name, {Map<String, dynamic>? params})
  QR.navigator.push(String path);

  QR.navigator.replaceAll(String path);
  QR.navigator.replaceAllWithName(String name, {Map<String, dynamic>? params});

  QR.navigator.replace(String path, String withPath);
  QR.navigator.removeLast();

or just call the navigator QR.navigatorOf('Dashboard')

Use these functions to see your navigators and Stack history and active pages in your project for a better understanding of where you are in your project and how to order your pages.

QR.getActiveTree() // Will show you a dialog contains the tree of the active navigator and pages
QR.history.debug() // will show you a dialog contains the history stack for your current page.

Demo

The example Projects

Show Demo

You can find the demo code in the example project

The Samples Project

You can check out the samples project for more samples and test some use case

Parameters

send your params with the route. The params could be any object type.

Path Parameters

QRoute(path: '/:orderId',page: (child) => OrderDetails()),

// User regex to define what this parameter can be
// like this parameters can only be numbers
QRoute(path: '/:id(^[0-9]+\$)', builder: () => Text('Case 2')), 

// and this receive it in your page
final orderId = QR.params['orderId'].toString()

Query Parameters

 QR.to('/home/items/details?itemName=${e.name}&numbers=[2,6,7]')

// and this receive it in your page
final itemName = QR.params['itemName'].toString()
final numbers = QR.params['numbers']

Params features

• keepAlive: by default, the param will be deleted when navigating to a new route that does not contain it, so if you don't what to delete it in this case set this property to true, and the package will not delete as long as this property is true
• onChange: set function to be called when this param will be changed it gives the current value and the new value
• onDelete: set function to be called when this param will be deleted
• asInt: Will return the value as int?
• asDouble: Will return the value as double
• valueAs: Will return the value as the given type
• cleanupAfter: set cleanupAfter so the package will clean up this param after X callas, where x is the number you set in cleanupAfter, a call could be push, replace, pop or to

Middleware

with middleware, you can set custom actions to run with the different event when you navigate to define them add QMiddlewareBuilder or a custom class that extends 'QMiddleware' them in your route, they will be called in the same order they are defined in.

 QRoute(
    path: '/home',
    builder: () {
      return HomePage();
    },
    middleware: [
      QMiddlewareBuilder(
          onEnterFunc: () => print('-- Enter Parent page --'),
          onExitFunc: () => print('-- Exit Parent page --'),
          onMatchFunc: () => print('-- Parent page Matched --')),
      AuthMiddleware(),
    ])

class AuthMiddleware extends QMiddleware{
  final dataStorage = // Get you Data storage
  @override
  bool canPop() => dataStorage.canLeave;
  @override
  Future<String?> redirectGuard(String path) async => dataStorage.isLoggedIn ? null: '/parent/child-2';
}

@startuml


[-> QRController : Navigation Request
collections OnMatch as OnMatch
collections Redirect as Redirect
collections OnEnter as OnEnter
QRController -> OnMatch: searching for\nthe matching route
OnMatch -> Redirect
Redirect -> OnEnter : Initializing the page
Redirect ->] : new navigation request to the redirect path

OnEnter -> Ready 
collections CanPop as CanPop
collections onExit as onExit
Ready -> CanPop: :on leaving the page
CanPop -> onExit : can leave the page
CanPop -> Ready : cannot leave the page
onExit->]: remove page

@enduml

redirectGuard

you can redirect to a new page whenever a page is called using the redirectGuard.

The redirectGuard gives the path as a parameter and takes the new path to redirect to. or it takes null so the page can be accessed.

canPop

can this route pop, called when trying to remove the page.

onMatch

This method will be called every time a path match it.

onEnter

This method will be called before adding the page to the stack and before the page building

onExit

This method will be called before removing the page from the stack

Observer

to observe every navigation in your app you could set QObserver to the QR.observer. QObserver can have :

• onNavigate: add listener to every new route that will be added to the tree
• onPop: Add listener to every route that will be deleted from the tree

Not found page

you can set your custom not found page to show it whenever a page was not found, or a default one will be set.

  QR.settings.notFoundPage = QRoute(path: '/404', builder: ()=> NotFoundPage())

Deferred loading

For web application you can split your compiled java script files to moe than one for helping with the page loading speed. read more about it here

Page Transition

To chose the Transition for your page set the QRoute.pageType to the of the types:

• QPlatformPage: This type will be set as QCupertinoPage on IOS devices otherwise it will be QMaterialPage.
• QMaterialPage: It will use the default MaterialRouteTransition
• QCupertinoPage: It will use the default CupertinoRouteTransition
• QCustomPage: to define a custom transition for your page.
• QSlidePage: a predefined slide transition
• QFadePage: a predefined fade transition

Mix it up

you can mix the transition animation by setting the property withType so if you want to show slide and fade transition you can do

QRoute(
      path: '/child',
      pageType: QFadePage(
          transitionDurationMilliseconds: 1000,
          withType: QSlidePage(transitionDurationMilliseconds: 5000), // set the type to mix with
          ),
      builder: () => TextPage('Hi child 4')),
]),

please note that when you mix transitions the only the first transition duration will be used in this case QFadePage.transitionDurationMilliseconds (1000) will be used and QSlidePage.transitionDurationMilliseconds (5000) will be ignored

QPlatformPage, QMaterialPage and QCupertinoPage CANNOT be mixed.

App Page Transition

you can define the Transition for all pages in the app with setting the page type in QR.settings.pagesType

Add or remove routes in run Time

You can add new routes or delete the existing route from the route tree dynamically while the app is running. Just chose which navigator you want to add the routes to and then call

final navigator = QR.rootNavigator; // to add routes to the root navigator
final navigator = QR.navigatorOf('/dashboard') // or add the routes to the dashboard navigator
navigator.addRoutes([QRoute(path: '/payrolls', builder:()=> PayrollsPage()]);
// now the use can navigate to the payrolls page
navigator.removeRoutes(['/payrolls']);
// now if the use navigate to the payrolls page he will get not found page

Clean Structure

You can split your route definition into multiple files so the route tree doesn't get too messy, or if you work with multiple Teams so each team can have his tree definition.

class StoreRoutes {
  static const store = 'Store';
  static const orders = 'Orders';
  static const items = 'Items';

  QRoute routes() => QRoute.withChild(
          name: store,
          path: '/store',
          builderChild: (child) => StorePage(child),
          initRoute: '/orders',
          children: [
            QRoute(name: items, path: '/items', builder: () => ItemsPage()),
            QRoute(name: orders, path: '/orders', builder: () => OrderPage()),
          ]);
}

class HomeRoutes {
  static const home = 'Home';
  static const info = 'Info';
  static const settings = 'Settings';

  QRoute routes() => QRoute.withChild(
          name: home,
          path: '/store',
          builderChild: (child) => StorePage(child),
          initRoute: '/info',
          children: [
            QRoute(name: info, path: '/info', builder: () => InfoPage()),
            QRoute(
                name: settings,
                path: '/settings',
                builder: () => SettingsPage()),
          ]);
}

class AppRoutes {
  static const app = 'App';
  List<QRoute> routes() => [
        QRoute.withChild(
            name: app,
            path: '/',
            builderChild: (child) => AppPage(child),
            initRoute: '/store',
            children: [
              StoreRoutes().routes(), // Add the Store routes to the app
              HomeRoutes().routes(), // Add the Home routes to the app
            ]),
      ];
}

Declarative routing

if you want to change a page automatically according to an object state with having to check the object every time and then send the user to the right page. you can do so with the declarative routing. just link the object to QDeclarative and define the route to go to with every object change a let the rest toQDeclarative.

This is very useful when you have an object with a lot of properties that users need to fill. instead of one page with a lot of TextInputs (what is boring), you can split your object properties through multiple pages. and the user can fill them as flow one page at a time.

Note: you don't need to define these routes in the AppRoute routes.

First you need to define the parent root of the declarative route as declarative. and here you will get a key you need to pass it to QDeclarative.

   QRoute.declarative(path: '/declarative',declarativeBuilder: (k) => DeclarativePage(k)),

Then in the DeclarativePage in the build function give as widget a QDeclarative

The QDeclarative required tow parameters

• routeKey: key you got from QRoute
• builder: List of type List<QDRoute> of the route to return based on the state See QDRoute

QDeclarative(
      routeKey: widget.dKey, // give the key you got from QRoute
      builder: () => [ 
               name: 'Hungry',
              builder: () =>getQuestion((v) => state.loveCoffee = v, 'Do you love Coffee?'),
              when: () => state.loveCoffee == null,
              // when this route pop, if you want to get out of the declarative
              // router give false as result so the router know that this
              // function didn't processed the pop and process it
              onPop: () => false,
            ),
            QDRoute(
                name: 'Burger',
                builder: () => getQuestion((v) => state.loveBurger = v, 'Do you love burger?'),
                onPop: () => state.loveCoffee = null,
                when: () => state.loveBurger == null),
            QDRoute(
                name: 'Pizza',
                builder: () => getQuestion((v) => state.lovePizza = v, 'Do you love Pizza?'),
                onPop: () => state.loveBurger = null,
                when: () => state.lovePizza == null,
                pageType: QSlidePage(offset: Offset(-1, 1))),
            QDRoute(
                name: 'Result',
                builder: result,
                onPop: () => state.lovePizza = null,
                when: () => state.allSet)
          ]));

QDRoute

This route is used with QDeclarative to define the pages to show according to the object state:

• name: this name will be used as a key to define the route.
• builder: here you give the widget to show.
• when: when should the page be shown. here you can set the condition that defines if the page should be added to the page list.
• onPop: this function will be called when the user what to go back, this will be trigger with QR.back, android back button, and browser back button. if you want on a page to get out of the QDeclarative to the previews page in the normal router give this function a false as a result so the router knows that this page has not been processed and the router needs to process it.
• pageType: The page Transition

How Declarative router works

On every rebuild on the page the QDeclarative will call QDeclarative.builder and get the ** the First page* the returns true from QDRoute.when and then checks if the page exists in the page list, if yes all pages above it will be removed so the page will be on the top and be shown. If no will add it on the top and the page will be shown.

Remove Url Hashtag

If you what to remove the hashtag from the URL place it in your main method

void main() {
  QR.setUrlStrategy();
  runApp(MyApp());
}

Note: sometimes in release mode you could get an error when you remove the hashtag, to fix it please see this

Web hot reload

According to This the hot reload feature could take some time unit it is ready. So I took this idea and I made a fake BrowserAddressBar. so we can develop our application on Windows or Linux or Android and still having the BrowserAddressBar. This bar will only appear on debug mode and when the platform is not web.

To activate it.

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) => MaterialApp.router(
      routeInformationParser: QRouteInformationParser(),
      routerDelegate: QRouterDelegate(AppRoutes().routes, withWebBar: true));
}

Contribute

Any Contributing is welcome, You could help with writing test. More example, or any new ideas to the package