commandy 0.1.1

A modern Flutter package for managing asynchronous commands and state effectively.

example/lib/main.dart

import 'dart:developer';

import 'package:commandy/commandy.dart';
import 'package:example/main_viewmodel.dart';
import 'package:example/ticker.dart';
import 'package:example/timer_screen.dart';
import 'package:example/timer_viewmodel.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.lightBlue),
        useMaterial3: true,
      ),
      home: MyHomePage(
        viewModel: MainViewModel(),
      ),
    );
  }
}

class MyHomePage extends StatelessWidget {
  const MyHomePage({super.key, required this.viewModel});

  final MainViewModel viewModel;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: const Text('Commandy example'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            ValueListenableBuilder(
              valueListenable: viewModel.incrementCommand.result,
              builder: (context, result, child) {
                final counter = result?.fold(
                  (value) => value,
                  (failure) {
                    log(failure.message, name: 'Main');
                  },
                );
                return Text(
                  '${counter ?? viewModel.counter}',
                  style: Theme.of(context).textTheme.headlineMedium,
                );
              },
            ),
            const SizedBox(height: 10),
            FilledButton(
              onPressed: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(
                    builder: (context) => TimerScreen(
                      timerViewModel: TimerViewModel(
                        ticker: const Ticker(),
                      ),
                    ),
                  ),
                );
              },
              child: const Text('Timer example'),
            )
          ],
        ),
      ),
      floatingActionButton: ValueListenableBuilder(
        valueListenable: viewModel.incrementCommand.isExecuting,
        builder: (context, loading, child) => FloatingActionButton(
          onPressed: loading
              ? null
              : () => viewModel.incrementCommand.execute(const NoParams()),
          tooltip: 'Increment',
          child: loading
              ? const CircularProgressIndicator()
              : const Icon(Icons.add),
        ),
      ),
    );
  }
}