state_controller 1.0.0

A new Flutter package.

state_controller

https://pub.dartlang.org/packages/state_controller

A new Flutter package.

About

This library is aimed at separating the logic of drawing a widget and changing its state. Please look at the example in the project.

Example

class App extends StatelessWidget {
// This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return ControllerProviderConfig(
      child: MaterialApp(
        title: 'Flutter Demo',
        theme: ThemeData(
          primarySwatch: Colors.blue,
        ),
        home: MyHomePage(title: 'Flutter Demo Home Page'),
      ),
      configurations: [
        Configuration(
          type: CounterController,
          creator: () => CounterController(),
          singleton: true,
        ),
      ],
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState
    extends StateWithController<MyHomePage, CounterController> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            StreamBuilder(
              initialData: 0,
              stream: controller.counterStream,
              builder: (context, snapshot) {
                return Text(
                  '${snapshot.data}',
                  style: Theme.of(context).textTheme.display1,
                );
              },
            ),
          ],
        ),
      ),
      floatingActionButton: IncrementFab(),
    );
  }
}

class IncrementFab extends StatefulWidget {
  @override
  _IncrementFabState createState() => _IncrementFabState();
}

class _IncrementFabState
    extends StateWithController<IncrementFab, CounterController> {
  @override
  Widget build(BuildContext context) {
    return FloatingActionButton(
      onPressed: controller.increment,
      tooltip: 'Increment',
      child: Icon(Icons.add),
    );
  }
}

class CounterController extends StateController {
  int _count = 0;
  final StreamController<int> _counterStreamController = StreamController();

  Stream<int> get counterStream => _counterStreamController.stream;

  @override
  void init() {
    // TODO: implement init
  }

  @override
  void onConfigurationChanged() {
    // TODO: implement onConfigurationChanged
  }

  void increment() {
    _counterStreamController.add(++_count);
  }

  @override
  void dispose() {
    _counterStreamController.close();
    super.dispose();
  }
}

Docs

ControllerProviderConfig

Used to configure the 'ControllerProvider' and support hot reload.

ControllerProvider

method 'addControllerConfiguration(Configuration configuration)' allows you to add a configuration at run time.

method 'provide

StateController

method get 'context' returns 'BuildContext' from the last updated 'Widget' (use carefully).

mixin ControllerInjector<W extends StatefulWidget, T extends StateController> on State

This class is used to create and provide 'StateController' in your 'State'.

abstract StateWithController extends State with ControllerInjector

Only be used for a short record if you are not inheriting from your 'State'.