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// 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.
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
/// Flutter code sample for [Shortcuts].
void main() => runApp(const ShortcutsExampleApp());
class ShortcutsExampleApp extends StatelessWidget {
const ShortcutsExampleApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: const Text('Shortcuts Sample')),
body: const Center(
child: ShortcutsExample(),
),
),
);
}
}
class Model with ChangeNotifier {
int count = 0;
void incrementBy(int amount) {
count += amount;
notifyListeners();
}
void decrementBy(int amount) {
count -= amount;
notifyListeners();
}
}
class IncrementIntent extends Intent {
const IncrementIntent(this.amount);
final int amount;
}
class DecrementIntent extends Intent {
const DecrementIntent(this.amount);
final int amount;
}
class IncrementAction extends Action<IncrementIntent> {
IncrementAction(this.model);
final Model model;
@override
void invoke(covariant IncrementIntent intent) {
model.incrementBy(intent.amount);
}
}
class DecrementAction extends Action<DecrementIntent> {
DecrementAction(this.model);
final Model model;
@override
void invoke(covariant DecrementIntent intent) {
model.decrementBy(intent.amount);
}
}
class ShortcutsExample extends StatefulWidget {
const ShortcutsExample({super.key});
@override
State<ShortcutsExample> createState() => _ShortcutsExampleState();
}
class _ShortcutsExampleState extends State<ShortcutsExample> {
Model model = Model();
@override
Widget build(BuildContext context) {
return Shortcuts(
shortcuts: <ShortcutActivator, Intent>{
LogicalKeySet(LogicalKeyboardKey.arrowUp): const IncrementIntent(2),
LogicalKeySet(LogicalKeyboardKey.arrowDown): const DecrementIntent(2),
},
child: Actions(
actions: <Type, Action<Intent>>{
IncrementIntent: IncrementAction(model),
DecrementIntent: DecrementAction(model),
},
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'),
ListenableBuilder(
listenable: model,
builder: (BuildContext context, Widget? child) {
return Text('count: ${model.count}');
},
),
],
),
),
),
);
}
}