get 2.0.3-dev

Navigate between screens, display snackbars, dialogs and bottomSheets, from anywhere in your code without context with Get.

Get

Get is an extra-light and powerful library for Flutter that will give you superpowers and increase your productivity. Navigate without context, open dialogs, snackbars or bottomsheets from anywhere in your code in an easy and practical way! Get is secure, stable, up-to-date, and offers a huge range of APIs that are not present on default framework.

// Default Flutter navigator
Navigator.of(context).push(
        context,
        MaterialPageRoute(
           builder: (BuildContext context) { 
            return HomePage();
          },
        ),
      );

// Get sintax 
Get.to(Home());

Languages: English, Brazilian Portuguese.

Getting Started

Flutter's conventional navigation has a lot of unnecessary boilerplate, requires context to navigate between screens, open dialogs, and use snackbars on framework is really boring. In addition, when a route is pushed, the entire MaterialApp can be rebuilt causing freezes, this does not happen with Get. This library that will change the way you work with the Framework and save your life from cliche code, increasing your productivity, and eliminating the rebuild bugs of your application.

How to use?

• Flutter Master/Dev/Beta: version 2.0.3-dev
• Flutter Stable branch: version 2.0.1

Add this to your package's pubspec.yaml file:

dependencies:
  get: ^2.0.1 // ^2.0.3-dev on beta/dev/master

Exchange your MaterialApp for GetMaterialApp and enjoy!

import 'package:get/get.dart';
GetMaterialApp( // Before: MaterialApp(
  home: MyHome(),
)

Navigating without named routes

To navigate to a new screen:

Get.to(NextScreen());

To return to previous screen

Get.back();

To go to the next screen and no option to go back to the previous screen (for use in SplashScreens, login screens and etc.)

Get.off(NextScreen());

To go to the next screen and cancel all previous routes (useful in shopping carts, polls, and tests)

Get.offAll(NextScreen());

To navigate to the next route, and receive or update data as soon as you return from it:

var data = await Get.to(Payment());

on other screen, send a data for previous route:

Get.back(result: 'sucess');

And use it:

ex:

if(data == 'sucess') madeAnything();

Don't you want to learn our syntax? Just change the Navigator (uppercase) to navigator (lowercase), and you will have all the functions of the standard navigation, without having to use context Example:

// Default Flutter navigator
Navigator.of(context).push(
        context,
        MaterialPageRoute(
           builder: (BuildContext context) { 
            return HomePage();
          },
        ),
      );

// Get using Flutter syntax without needing context
navigator.push(
        MaterialPageRoute(
           builder: (_) { 
            return HomePage();
          },
        ),
      );

// Get sintax (It is much better, but you have the right to disagree)
Get.to(HomePage());

SnackBars

To have a simple SnackBar with Flutter, you must get the context of Scaffold, or you must use a GlobalKey attached to your Scaffold,

final snackBar = SnackBar(
      content: Text('Hi!'),
      action: SnackBarAction(
              label: 'I am a old and ugly snackbar :(',
              onPressed: (){}
            ),
          // Find the Scaffold in the widget tree and use
          // it to show a SnackBar.
          Scaffold.of(context).showSnackBar(snackBar);

With Get:

Get.snackbar('Hi', 'i am a modern snackbar');

With Get, all you have to do is call your Get.snackbar from anywhere in your code or customize it however you want!

  Get.snackbar(
               "Hey i'm a Get SnackBar!", // title
               "It's unbelievable! I'm using SnackBar without context, without boilerplate, without Scaffold, it is something truly amazing!", // message
              icon: Icon(Icons.alarm), 
              shouldIconPulse: true,
              onTap:(){},
              barBlur: 20,
              isDismissible: true,
              duration: Duration(seconds: 3),
            );


  ////////// ALL FEATURES //////////
  //     Color colorText,
  //     Duration duration,
  //     SnackPosition snackPosition,
  //     Widget titleText,
  //     Widget messageText,
  //     Widget icon,
  //     bool shouldIconPulse,
  //     double maxWidth,
  //     EdgeInsets margin,
  //     EdgeInsets padding,
  //     double borderRadius,
  //     Color borderColor,
  //     double borderWidth,
  //     Color backgroundColor,
  //     Color leftBarIndicatorColor,
  //     List<BoxShadow> boxShadows,
  //     Gradient backgroundGradient,
  //     FlatButton mainButton,
  //     OnTap onTap,
  //     bool isDismissible,
  //     bool showProgressIndicator,
  //     AnimationController progressIndicatorController,
  //     Color progressIndicatorBackgroundColor,
  //     Animation<Color> progressIndicatorValueColor,
  //     SnackStyle snackStyle,
  //     Curve forwardAnimationCurve,
  //     Curve reverseAnimationCurve,
  //     Duration animationDuration,
  //     double barBlur,
  //     double overlayBlur,
  //     Color overlayColor,
  //     Form userInputForm
  ///////////////////////////////////

If you prefer the traditional snackbar, or want to customize it from scratch, including adding just one line (Get.snackbar makes use of a mandatory title and message), you can use GetBar().show(); which provides the RAW API on which Get.snackbar was built.

Dialogs

To open dialog:

Get.dialog(YourDialogWidget());

To open default dialog:

 Get.defaultDialog(
                title: "My Title",
                content: Text("Hi, it's my dialog"),
                confirm: FlatButton(
                  child: Text("Ok"),
                  onPressed: () => print("OK pressed"),
                ),
                cancel: FlatButton(
                  child: Text("Cancel"),
                  onPressed: () => Get.back(),
                ));

BottomSheets

Get.bottomSheet is like showModalBottomSheet, but don't need of context.

Get.bottomSheet(
     Container(
            child: Wrap(
            children: <Widget>[
            ListTile(
            leading: Icon(Icons.music_note),
            title: Text('Music'),
            onTap: () => {}          
          ),
            ListTile(
            leading: Icon(Icons.videocam),
            title: Text('Video'),
            onTap: () => {},          
          ),
            ],
          ),
       );
      }
    );

Simple State Manager

There are currently several state managers for Flutter. However, most of them involve using an inheritedWidget to access your data through context and use ChangeNotifier to update widgets (like the Provider), or are too complex for beginners (like BLoC), others are easy and reactive (like MobX) however they need to use a code generator. So I created in just 95 lines of code this easy and light state manager, which does not use ChangeNotifier (ChangeNotifier is bad for performance, and which will supply the need especially for those who are new to Flutter. Get is omniscient, this means that it has access to any Flutter API, whether inside or outside the widget tree. The Get state manager updates only the necessary Widget, uses the widgets' own memory status to update, making it more efficient than ChangeNotifier, and does not use InheritedWidget, giving you full control of the state of your application. This does not mean that it is the best state manager, but it is an ideal solution for certain types of users.

Get's state manager is perfect for the MVC standard, and you can use it like this:

// Create controller class and extends GetController
class Controller extends GetController {
  int counter = 0;
  void increment() {
    counter++;
    update(this); // use update(this) to update counter variable um UI when increment be called
  }
}
// On your Stateless/Stateful class, use GetBuilder to update Text when increment be called 
GetBuilder<Controller>(
    init: Controller(), // INIT IT ONLY THE FIRST TIME
    builder: (_) => Text(
              '${_.counter}',
              )),
//Initialize your controller only the first time. The second time you are using ReBuilder for the same controller, do not use it again. Your controller will be automatically removed from memory as soon as the widget that marked it as 'init' is deployed. You don't have to worry about that, Get will do it automatically, just make sure you don't start the same controller twice.

Done!

• You have already learned how to manage states with Get.

Global State manager

If you navigate many routes and need data that was in your previously used controller, you just need to use GetBuilder Again (with no init):

class OtherClasse extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: GetBuilder<Controller>(
          builder: (s) => Text('${s.counter}'),
        ),
      ),
    );
  }

If you need to use your controller in many other places, and outside of ReBuilder, just create a get in your controller and have it easily. You can copy this code and just change the name of your controller.

class Controller extends GetController {
  static Controller get to => Get.find(); // add this line 
  int counter = 0;
  void increment() {
    counter++;
    update(this); 
  }
}

And then you can access your controller directly, that way:

FloatingActionButton(
        onPressed:(){
         Controller.to.increment(), 
        } // This is incredibly simple!
        child: Text("${Controller.to.counter}"),
      ),

When you press FloatingActionButton, all widgets that are listening to the 'counter' variable will be updated automatically.

Different forms of use:

You can use controlador instance directly on GetBuilder:

GetBuilder<Controller>(  //here
    init: Controller(),
    builder: (value) => Text(
              '${value.counter}', //here
              )),

Or use controller instance:

Controller controller = Controller();
[...]
GetBuilder( // you dont need to type on this way
    init: controller, //here
    builder: (_) => Text(
              '${controller.counter}', // here
              )),

Recommended:

class Controller extends GetController {
  static Controller get to => Get.find(); 
[...]
}
// on stateful/stateless class
GetBuilder<Controller>(  
    init: Controller(), // use it only first time on each controller
    builder: (_) => Text(
              '${Controller.to.counter}', //here
              )),

Simple Instance Manager

Are you already using Get and want to make your project as lean as possible? Now Get has a simple instance manager that allows you to retrieve the same class as your Bloc or Controller with just 1 lines of code.

Controller controller = Get.put(Controller()); // Rather Controller controller = Controller();

Instead of instantiating your class within the class you are using, you are instantiating it within the Get instance, which will make it available throughout your App. So you can use your controller (or class Bloc) normally

controller.fetchApi();// Rather Controller controller = Controller();

Imagine that you have navigated through numerous routes, and you need a data that was left behind in your controller, you would need a state manager combined with the Provider or Get_it, correct? Not with Get. You just need to ask Get to "find" for your controller, you don't need any additional dependencies:

Controller controller = Get.find();
//Yes, it looks like Magic, Get will find your controller, and will deliver it to you. You can have 1 million controllers instantiated, Get will always give you the right controller.

And then you will be able to recover your controller data that was obtained back there:

Text(controller.textFromApi);

To remove a instance of Get:

Get.delete(Controller());

Navigate with named routes:

• If you prefer to navigate by namedRoutes, Get also supports this.

To navigate to nextScreen

Get.toNamed("/NextScreen");

To navigate and remove the previous screen from the tree.

Get.offNamed("/NextScreen");

To navigate and remove all previous screens from the tree.

Get.offAllNamed("/NextScreen");

To define routes, use GetMaterialApp:

void main() {
  runApp(GetMaterialApp(
    initialRoute: '/',
    namedRoutes: {
      '/': GetRoute(page: MyHomePage()),
      '/second': GetRoute(page: Second()),
      '/third': GetRoute(page: Third(),transition: Transition.cupertino);
    },
  ));
}

Send data to named Routes:

Just send what you want for arguments. Get accepts anything here, whether it is a String, a Map, a List, or even a class instance.

Get.toNamed("/NextScreen", arguments: 'Get is the best');

on your class or controller:

print(Get.arguments);
//print out: Get is the best

Dynamic urls links

Get is the first and only package to offer advanced dynamic urls just like on the Web. Web developers have probably already wanted this feature on Flutter, and most likely have seen a package promise this feature and deliver a totally different syntax than a URL would have on web, but Get also solves that.

Get.offAllNamed("/NextScreen?device=phone&id=354&name=Enzo");

on your controller/bloc/stateful/stateless class:

print(Get.parameters['id']);
// out: 354
print(Get.parameters['name']);
// out: Enzo

You can also receive NamedParameters with Get easily:

void main() {
  runApp(GetMaterialApp(
    initialRoute: '/',
    namedRoutes: {
      '/': GetRoute(page: MyHomePage()),
      '/second/:user': GetRoute(page: Second()), // receive ID
      '/third': GetRoute(page: Third(),transition: Transition.cupertino);
    },
  ));
}

Send data on route name

Get.toNamed("/second/34954");

On second screen take the data by parameter

print(Get.parameters['user']);
// out: 34954

And now, all you need to do is use Get.toNamed() to navigate your named routes, without any context (you can call your routes directly from your BLoC or Controller class), and when your app is compiled to the web, your routes will appear in the url <3

Middleware

If you want listen Get events to trigger actions, you can to use routingCallback to it

GetMaterialApp(
  routingCallback: (route){
    if(routing.current == '/second'){
      openAds();
    }
  }

If you are not using GetMaterialApp, you can use the manual API to attach Middleware observer.

void main() {
  runApp(MaterialApp(
    onGenerateRoute: Router.generateRoute,
    initialRoute: "/",
    navigatorKey: Get.key,
    navigatorObservers: [
        GetObserver(MiddleWare.observer), // HERE !!!
    ],
  ));
}

Create a MiddleWare class

class MiddleWare {
  static observer(Routing routing) {
    /// You can listen in addition to the routes, the snackbars, dialogs and bottomsheets on each screen. 
    ///If you need to enter any of these 3 events directly here, 
    ///you must specify that the event is != Than you are trying to do.
    if (routing.current == '/second' && !routing.isSnackbar) {
      Get.snackbar("Hi", "You are on second route");
    } else if (routing.current =='/third'){
      print('last route called');
    }
  }
}

Now, use Get on your code:

class First extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: IconButton(
          icon: Icon(Icons.add),
          onPressed: () {
            Get.snackbar("hi", "i am a modern snackbar");
          },
        ),
        title: Text('First Route'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('Open route'),
          onPressed: () {
            Get.toNamed("/second");
          },
        ),
      ),
    );
  }
}

class Second extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: IconButton(
          icon: Icon(Icons.add),
          onPressed: () {
            Get.snackbar("hi", "i am a modern snackbar");
          },
        ),
        title: Text('second Route'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('Open route'),
          onPressed: () {
            Get.toNamed("/third");
          },
        ),
      ),
    );
  }
}

class Third extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Third Route"),
      ),
      body: Center(
        child: RaisedButton(
          onPressed: () {
            Get.back();
          },
          child: Text('Go back!'),
        ),
      ),
    );
  }
}

Optional Global Settings

You can create Global settings for Get. Just add Get.config to your code before pushing any route or do it directly in your GetMaterialApp

GetMaterialApp(
      enableLog: true,
      defaultTransition: Transitions.fade,
      defaultOpaqueRoute: Get.isOpaqueRouteDefault,
      defaultPopGesture: Get.isPopGestureEnable,
      defaultDurationTransition: Get.defaultDurationTransition,
      defaultGlobalState: Get.defaultGlobalState,
    );

Get.config(
      enableLog = true,
      defaultPopGesture = true,
      defaultTransition = Transitions.cupertino}

Other Advanced APIs and Manual configurations

GetMaterialApp configures everything for you, but if you are using any package like Modular, you may want to configure Get Manually using advanced APIs.

MaterialApp(
      navigatorKey: Get.key,
      navigatorObservers: [GetObserver()],
    );

You will also be able to use your own Middleware within GetObserver, this will not influence anything.

MaterialApp(
      navigatorKey: Get.key,
      navigatorObservers: [GetObserver(MiddleWare.observer)], // Here
    );

Get.arguments // give the current args from currentScreen

Get.previousArguments // give arguments of previous route

Get.previousRoute // give name of previous route

Get.rawRoute // give the raw route to access for example, rawRoute.isFirst()

Get.routing // give access to Rounting API from GetObserver

Get.isSnackbarOpen // check if snackbar is open

Get.isDialogOpen // check if dialog is open

Get.isBottomSheetOpen // check if bottomsheet is open

Get.removeRoute() // remove one route.

Get.until() // back repeatedly until the predicate returns true.

Get.offUntil() // go to next route and remove all the previous routes until the predicate returns true.

Get.offNamedUntil() // go to next named route and remove all the previous routes until the predicate returns true.

GetPlatform.isAndroid/isIOS/isWeb... //(This method is completely compatible with FlutterWeb, unlike the framework. "Platform.isAndroid")

Get.height / Get.width // Equivalent to the method: MediaQuery.of(context).size.height

Get.context // Gives the context of the screen in the foreground anywhere in your code.

Get.contextOverlay // Gives the context of the snackbar/dialog/bottomsheet in the foreground anywhere in your code.

Nested Navigators

Get made Flutter's nested navigation even easier. You don't need the context, and you will find your navigation stack by Id.

See how simple it is:

             Navigator(
                key: nestedKey(1), // create a key by index
                initialRoute: '/',
                onGenerateRoute: (settings) {
                  if (settings.name == '/') {
                    return GetRoute(
                      page: Scaffold(
                        appBar: AppBar(
                          title: Text("Main"),
                        ),
                        body: Center(
                          child: FlatButton(
                              color: Colors.blue,
                              onPressed: () {
                                Get.toNamed('/second', 1); // navigate by your nested route by index
                              },
                              child: Text("Go to second")),
                        ),
                      ),
                    );
                  } else if (settings.name == '/second') {
                    return GetRoute(
                      page: Center(
                        child: Scaffold(
                          appBar: AppBar(
                            title: Text("Main"),
                          ),
                          body: Center(
                            child:  Text("second")
                          ),
                        ),
                      ),
                    );
                  }
                }),

This library will always be updated and implementing new features. Feel free to offer PRs and contribute to them.