cubes 0.3.4

Simple State Manager (Focusing on rebuilding only the necessary)

Cubes

Simple State Manager with dependency injection and no code generation required.

With Cubes, rebuilding only takes place where it is needed!

MVVM based architecture.

Install

To use this plugin, add cubes as a dependency in your pubspec.yaml file.

Usage

• Creating Cube:

class CounterCube extends Cube {
  final count = ObservableValue<int>(value: 0);

  // To List use `ObservableList`.
  // To others objects not primitive remember call `prop.notify();` after modification to notify listeners.

    @override
    void ready() {
      // do anything when view is ready
      super.ready();
    }

    void increment() {
      count.value++;
      if (count.value == 5) {
        onAction({'key': 'param'}); // Method to send anything to view
      }
      if (count.value == 10) {
        onSuccess('Value iguals 10'); // Method to send the success message
      }
      if (count.value == 50) {
        onError('You are clicking too much o.O'); // Method to send the failure message
      }

      // example apply debounce
       runDebounce(
        'increment', // identify
        ()  => print(count.value),
        duration: Duration(seconds: 1),
      );
    }
}

• Registering Cubes and or dependencies:

import 'package:cubes/cubes.dart';
import 'package:flutter/material.dart';

void main() {
  // register cube
  registerCube((i) => CounterCube());

  // Example register singleton Cube
  // registerCube((i) => CounterCube(),isSingleton: true);

  // Example register repositories or anything
  // registerSingletonDependency((i) => SingletonRepository(i.get());
  // registerDependency((i) => FactoryRepository(i.get());

  runApp(MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: Home(),
    ));
}

• Creating view with CubeBuilder:

class Home extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return CubeBuilder<CounterCube>(
      onSuccess: (cube, text) {
        print('onSuccess: $text');
      },
      onError: (cube, text) {
        print('onError: $text');
      },
      onAction: (cube, data) {
        print('onAction: $data');
      },
      builder: (context, cube) {
        return Scaffold(
          appBar: AppBar(
            title: Text('Home'),
          ),
          body: Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Text(
                  'You have pushed the button this many times:',
                ),
                cube.count.build<int>((value) {
                  return Text(value.toString());
                }),
              ],
            ),
          ),
          floatingActionButton: FloatingActionButton(
            onPressed: cube.increment,
            tooltip: 'Increment',
            child: Icon(Icons.add),
          ), // This trailing comma makes auto-formatting nicer for build methods.
        );
      },
    );
  }
}

or use CubeWidget

class Home extends CubeWidget<CounterCube> {

  @override
  Widget buildView(BuildContext context, CounterCube cube) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            cube.count.build<int>((value) {
              return Text(value.toString());
            }),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: cube.increment,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }

  @override
  void onError(BuildContext context, PokemonCube cube, String text) {
    // TODO: implement onError
    super.onError(context, cube, text);
  }

  @override
  void onSuccess(BuildContext context, PokemonCube cube, String text) {
    // TODO: implement onSuccess
    super.onSuccess(context, cube, text);
  }

  @override
  void onAction(BuildContext context, PokemonCube cube, data) {
    // TODO: implement onAction
    super.onAction(context, cube, data);
  }
}

Cube and its dependencies are injected into CubeBuilder and CubeWidget without the need for any extra configuration.

By doing this:

  cube.count.build<int>((value) {
    return Text(value.toString());
  }),

we register by listening to the Observer count, and every time this variable is changed, the View is notified by running the code block again:

  return Text(value.toString());

This guarantees that in the whole widget tree of your screen, only the necessary is rebuilt.

Testing

import 'package:flutter_test/flutter_test.dart';

void main() {
  CounterCube cube;
  setUp(() {
    cube = CounterCube();
  });

  tearDown(() {
    cube?.dispose();
  });
  test('initial value', () {
    expect(cube.count.value, 0);
  });

  test('increment value', () {
    cube.increment();
    expect(cube.count.value, 1);
  });

  test('increment value 3 times', () {
    cube.increment();
    cube.increment();
    cube.increment();
    expect(cube.count.value, 3);
  });
}

Example with asynchronous call here

Useful extensions

    // BuildContextExtensions

    context.goTo(Widget());
    context.goToReplacement(Widget());
    context.goToAndRemoveUntil(Widget(),RoutePredicate);

    context.mediaQuery; // MediaQuery.of(context);
    context.padding; // MediaQuery.of(context).padding;
    context.viewInsets; // MediaQuery.of(context).viewInsets;

    context.sizeScreen; // MediaQuery.of(context).size;
    context.widthScreen; // MediaQuery.of(context).size.width;
    context.heightScreen; // MediaQuery.of(context).size.height;

    context.theme;
    context.scaffold;

Useful Widgets

AnimatedListCube

This is a version of AnimatedList that simplifies its use for the Cube context.

  AnimatedListCube<String>(
    itemList: cube.todoList,
    itemBuilder: (context, item, animation, type) {
      return ScaleTransition(
        scale: animation,
        child: _buildItem(item),
      );
    },
  )

Full usage example here.

Internationalization support

With Cubes you can configure internationalization in your application. in a simple way using .json files.

Using

Create a folder named lang and put your files with name location. This way:

Add path in your pubspec.yaml:

  # To add assets to your application, add an assets section, like this:
  assets:
   - lang/

In your MaterialApp you can configure the CubesLocalizationDelegate:

    final cubeLocation = CubesLocalizationDelegate(
      [
        Locale('en', 'US'),
        Locale('pt', 'BR'),
      ],
    );

    @override
    Widget build(BuildContext context) {
      return MaterialApp(
        title: 'My app',
        theme: ThemeData(
          primarySwatch: Colors.blue,
          visualDensity: VisualDensity.adaptivePlatformDensity,
        ),
        localizationsDelegates: cubeLocation.delegates, // see here
        supportedLocales: cubeLocation.supportedLocations, // see here
        home: Home(),
      );
    }

Ready!!! Your application already supports internationalization. Bas get the strings as follows:

  String text = getString('welcome');

Any questions see our example.