bon_notifiers 2.0.0

bon_notifiers: ^2.0.0 copied to clipboard

example/lib/main.dart

import 'dart:async';

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

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(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

///The default counter app rewritten to work with async notifier
///
///This will show a counter, that counts up with a delay of two seconds between calls.
class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  final _counter = AsyncValueNotifier<int>(data: 0);

  void _incrementCounter() {
    _counter.update((value) async {
      await Future.delayed(Duration(seconds: 2));
      if (value == 10) throw Exception('Value was 10');
      return value + 1;
    });
  }

  @override
  void dispose() {
    _counter.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,

        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text('You have pushed the button this many times:'),
            AsyncValueListenableBuilder(
              asyncListenable: _counter,
              resultBuilder: (context, count, _) {
                return Text(
                  '$count',
                  style: Theme.of(context).textTheme.headlineMedium,
                );
              },
              errorBuilder: (context, error, _) {
                return Text('An error occured: $error');
              },
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}