| // 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 CharacterActivator |
| |
| import 'package:flutter/material.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 HelpMenuIntent extends Intent { |
| const HelpMenuIntent(); |
| } |
| |
| class MyStatefulWidget extends StatefulWidget { |
| const MyStatefulWidget({Key? key}) : super(key: key); |
| |
| @override |
| State<MyStatefulWidget> createState() => _MyStatefulWidgetState(); |
| } |
| |
| class _MyStatefulWidgetState extends State<MyStatefulWidget> { |
| @override |
| Widget build(BuildContext context) { |
| return Shortcuts( |
| shortcuts: const <ShortcutActivator, Intent>{ |
| CharacterActivator('?'): HelpMenuIntent(), |
| }, |
| child: Actions( |
| actions: <Type, Action<Intent>>{ |
| HelpMenuIntent: CallbackAction<HelpMenuIntent>( |
| onInvoke: (HelpMenuIntent intent) { |
| ScaffoldMessenger.of(context).showSnackBar( |
| const SnackBar(content: Text('Keep calm and carry on!')), |
| ); |
| return null; |
| }, |
| ), |
| }, |
| child: Focus( |
| autofocus: true, |
| child: Column( |
| children: const <Widget>[ |
| Text('Press question mark for help'), |
| ], |
| ), |
| ), |
| ), |
| ); |
| } |
| } |