// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Flutter code sample for Shortcuts

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);

  static const String _title = 'Flutter Code Sample';

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

class IncrementIntent extends Intent {
  const IncrementIntent();
}

class DecrementIntent extends Intent {
  const DecrementIntent();
}

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

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  int count = 0;

  @override
  Widget build(BuildContext context) {
    return Shortcuts(
      shortcuts: <ShortcutActivator, Intent>{
        LogicalKeySet(LogicalKeyboardKey.arrowUp): const IncrementIntent(),
        LogicalKeySet(LogicalKeyboardKey.arrowDown): const DecrementIntent(),
      },
      child: Actions(
        actions: <Type, Action<Intent>>{
          IncrementIntent: CallbackAction<IncrementIntent>(
            onInvoke: (IncrementIntent intent) => setState(() {
              count = count + 1;
            }),
          ),
          DecrementIntent: CallbackAction<DecrementIntent>(
            onInvoke: (DecrementIntent intent) => setState(() {
              count = count - 1;
            }),
          ),
        },
        child: Focus(
          autofocus: true,
          child: Column(
            children: <Widget>[
              const Text('Add to the counter by pressing the up arrow key'),
              const Text(
                  'Subtract from the counter by pressing the down arrow key'),
              Text('count: $count'),
            ],
          ),
        ),
      ),
    );
  }
}