CallbackShortcuts widget of the week example

main.dart

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

void main() => runApp(const MyApp());

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('CallbackShortcuts example')),
        body: const Center(
          child: CallbackShortcutsExample(),
        ),
      ),
    );
  }
}

class CallbackShortcutsExample extends StatefulWidget {
  const CallbackShortcutsExample({super.key});

  @override
  State<CallbackShortcutsExample> createState() =>
      _CallbackShortcutsExampleState();
}

class _CallbackShortcutsExampleState extends State<CallbackShortcutsExample> {
  int count = 0;

  @override
  Widget build(BuildContext context) {
    return CallbackShortcuts(
      bindings: <ShortcutActivator, VoidCallback>{
        const CharacterActivator('+'): () {
          setState(() => count = count + 1);
        },
        const CharacterActivator('-'): () {
          setState(() => count = count - 1);
        },
        const SingleActivator(LogicalKeyboardKey.arrowUp): () {
          setState(() => count = count + 1);
        },
        const SingleActivator(LogicalKeyboardKey.arrowDown): () {
          setState(() => count = count - 1);
        },
      },
      child: Focus(
        autofocus: true,
        child: Text('Counter: $count'),
      ),
    );
  }
}