state_groups 0.4.0

state_groups: ^0.4.0 copied to clipboard

example/lib/main.dart

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

StateGroup<void> exampleStateGroup = StateGroup<void>();

void main() {
	runApp(const MyApp());
}

class MyApp extends StatelessWidget {
	const MyApp({super.key});

	@override
	Widget build(BuildContext context) {
		return MaterialApp(
			title: 'Flutter Demo',
			theme: ThemeData(
				primarySwatch: Colors.blue,
			),
			home: const MyHomePage(title: 'Flutter Demo Home Page'),
		);
	}
}

class MyHomePage extends StatefulWidget {
	const MyHomePage({required this.title, super.key});

	final String title;

	@override
	State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends SyncState<void, MyHomePage> {

	_MyHomePageState() : super(exampleStateGroup);

	int _counter = 0;

	// Normally we would use a setState() call here but because we're using state
  // groups we don't have to
	void _incrementCounter() {
    _counter++;

    exampleStateGroup.notifyAll();
	}

	@override
	Widget build(BuildContext context) {
		return Scaffold(
			appBar: AppBar(
				title: Text(widget.title),
			),
			body: Center(
				child: Column(
					mainAxisAlignment: MainAxisAlignment.center,
					children: <Widget>[
						const Text(
							'You have pushed the button this many times:',
						),
						Text(
							'$_counter',
							style: Theme.of(context).textTheme.headlineMedium,
						),
					],
				),
			),
			floatingActionButton: FloatingActionButton(
				onPressed: _incrementCounter,
				tooltip: 'Increment',
				child: const Icon(Icons.add),
			),
		);
	}
}