Keyboard shortcut example with / without TextField

main.dart

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

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

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

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return CounterShortcuts(
      onEscDetected: _incrementCounter,
      child: Scaffold(
        appBar: AppBar(
          title: const Text('Demo'),
        ),
        body: Center(
          child: Row(
            children: <Widget>[
              const Spacer(),
              // TODO: Uncomment the below. With a TextField, 
              // if you click into the TextField and out of it
              // then clicking ESC no longer works.
              // 
              // const Expanded(
              //   child: TextField(),
              // ),
              const Spacer(),
              const Text(
                'You have pushed ESC this many times:',
              ),
              Text('$_counter'),
              const Spacer(),
            ],
          ),
        ),
      ),
    );
  }
}

final incrementKeySet = LogicalKeySet(LogicalKeyboardKey.escape);

class IncrementIntent extends Intent {}

class CounterShortcuts extends StatelessWidget {
  const CounterShortcuts({
    Key? key,
    required this.child,
    required this.onEscDetected,
  }) : super(key: key);
  final Widget child;
  final VoidCallback onEscDetected;

  @override
  Widget build(BuildContext context) {
    return FocusableActionDetector(
      autofocus: true,
      shortcuts: {
        incrementKeySet: IncrementIntent(),
      },
      actions: {
        IncrementIntent: CallbackAction(onInvoke: (e) => onEscDetected.call()),
      },
      child: child,
    );
  }
}