bolter 3.6.0

Most simple and stable ui update instrument

example/lib/main.dart

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

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

class MyPresenter extends Presenter<MyPresenter> {
  MyPresenter() {
    print('kek');
  }

  @override
  void init() {
    super.init();
    print('init');
  }

  void incr() {
    perform(action: () => i++);
  }

  @override
  void dispose() {
    print('dispose');
    super.dispose();
  }

  var i = 0;
}

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

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    final h = MediaQuery.of(context).size.height;
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // TRY THIS: Try running your application with "flutter run". You'll see
        // the application has a blue toolbar. Then, without quitting the app,
        // try changing the seedColor in the colorScheme below to Colors.green
        // and then invoke "hot reload" (save your changes or press the "hot
        // reload" button in a Flutter-supported IDE, or press "r" if you used
        // the command line to start the app).
        //
        // Notice that the counter didn't reset back to zero; the application
        // state is not lost during the reload. To reset the state, use hot
        // restart instead.
        //
        // This works for code too, not just values: Most code changes can be
        // tested with just a hot reload.
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: PresenterProvider(
        child: const MyHomePage(title: 'Flutter Demo Home Page'),
        presenter: () => MyPresenter(),
      ),
    );
  }
}

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

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  late final presenter = context.presenter<MyPresenter>();

  void _incrementCounter() {
    presenter.incr();
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return BolterBuilder<int>(
        getter: () => presenter.i,
        builder: (context, val) {
          return Scaffold(
            appBar: AppBar(
              // TRY THIS: Try changing the color here to a specific color (to
              // Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
              // change color while the other colors stay the same.
              backgroundColor: Theme.of(context).colorScheme.inversePrimary,
              // Here we take the value from the MyHomePage object that was created by
              // the App.build method, and use it to set our appbar title.
              title: Text(widget.title),
            ),
            body: Center(
              // Center is a layout widget. It takes a single child and positions it
              // in the middle of the parent.
              child: Column(
                // Column is also a layout widget. It takes a list of children and
                // arranges them vertically. By default, it sizes itself to fit its
                // children horizontally, and tries to be as tall as its parent.
                //
                // Column has various properties to control how it sizes itself and
                // how it positions its children. Here we use mainAxisAlignment to
                // center the children vertically; the main axis here is the vertical
                // axis because Columns are vertical (the cross axis would be
                // horizontal).
                //
                // TRY THIS: Invoke "debug painting" (choose the "Toggle Debug Paint"
                // action in the IDE, or press "p" in the console), to see the
                // wireframe for each widget.
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  const Text(
                    'You have pushed the button this many times:',
                  ),
                  Text(
                    '$val',
                    style: Theme.of(context).textTheme.headlineMedium,
                  ),
                ],
              ),
            ),
            floatingActionButton: FloatingActionButton(
              onPressed: _incrementCounter,
              tooltip: 'Increment',
              child: const Icon(Icons.add),
            ), // This trailing comma makes auto-formatting nicer for build methods.
          );
        });
  }
}