state_controller 0.2.0

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.

Docs

LifecycleCallback

'onInitState' called when creating a controller in 'initState()' of your state.

'onUpdateWidget' called after changing the widget and before the method 'build()' of your state.

'onDispose' called when the 'dispose()' of your state.

mixin LifecycleSubject

'subscribe(LifecycleCallback callback)' subscribe to change lifecycle in this state.

StateController implements LifecycleCallback

'context' get BuildContext from ControllerCreator

'changeState' this method calls 'setState()' in itself, and therefore requires the same parameters.

abstract class ControllerCreator<W extends StatefulWidget, T extends StateController> extends State

This class is used to create and provide StateController

ControllerInjector

This class injected your StateController.

Custom provide controller

Use ControllerProvider.provide

Example

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

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

class _MyHomePageState extends ControllerCreator<MyHomePage, _MyHomePageController> {

  @override
  Widget buildWidget(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:',
            ),
            Text(
              '${controller.counter}',
              style: Theme.of(context).textTheme.display1,
            ),
          ],
        ),
      ),
      floatingActionButton: IncrementFab(),
    );
  }

  @override
  _MyHomePageController createController() => _MyHomePageController();
}

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

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


class _MyHomePageController extends StateController {
  int _counter = 0;

  int get counter => _counter;
  
  void increment() {
    changeState(() {
      _counter++;
    });
  }
}