Created
July 21, 2020 23:01
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| import 'package:flutter/material.dart'; | |
| import 'package:flutter/widgets.dart'; | |
| final Color darkBlue = Color.fromARGB(255, 18, 32, 47); | |
| void main() { | |
| runApp(MyApp()); | |
| } | |
| class MyApp extends StatelessWidget { | |
| @override | |
| Widget build(BuildContext context) { | |
| return MaterialApp( | |
| debugShowCheckedModeBanner: false, | |
| home: Scaffold( | |
| body: Center( | |
| child: MyWidget(), | |
| ), | |
| ), | |
| ); | |
| } | |
| } | |
| class MyWidget extends StatefulWidget { | |
| @override | |
| State<StatefulWidget> createState() => _MyWidgetState(); | |
| } | |
| class _MyWidgetState extends State<MyWidget> { | |
| List<RawKeyEvent> events = <RawKeyEvent>[]; | |
| bool _handleKey(FocusNode node, RawKeyEvent event) { | |
| setState(() { | |
| if (events.length > 4) | |
| events.removeRange(0, 1); | |
| events.add(event); | |
| }); | |
| return true; | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| return Directionality( | |
| textDirection: TextDirection.ltr, | |
| child: Column( | |
| children: <Widget>[ | |
| ...events.expand((RawKeyEvent event) => | |
| <Widget>[ | |
| Text('${event?.runtimeType}'), | |
| Text('${event?.logicalKey}'), | |
| Text('${event?.physicalKey}'), | |
| ], | |
| ), | |
| Focus( | |
| child: Center( | |
| child: SizedBox( | |
| width: 100, | |
| height: 100, | |
| child: FocusableArea( | |
| onKey: _handleKey, | |
| ), | |
| ), | |
| ), | |
| ), | |
| ], | |
| ) | |
| ); | |
| } | |
| } | |
| class FocusableArea extends StatefulWidget { | |
| FocusableArea({this.onKey}); | |
| final FocusOnKeyCallback onKey; | |
| @override | |
| State<StatefulWidget> createState() => _FocusableAreaState(); | |
| } | |
| class _FocusableAreaState extends State<FocusableArea> { | |
| final FocusNode node = FocusNode(); | |
| bool _isFocused = false; | |
| @override | |
| Widget build(BuildContext context) { | |
| return Focus( | |
| onKey: widget.onKey, | |
| onFocusChange: (bool value) { | |
| setState(() { | |
| _isFocused = value; | |
| }); | |
| }, | |
| focusNode: node, | |
| child: ColoredBox( | |
| color: _isFocused ? Colors.blue : Colors.grey, | |
| child: GestureDetector( | |
| onTap: () { | |
| if (_isFocused) | |
| node.unfocus(); | |
| else | |
| node.requestFocus(); | |
| }, | |
| ), | |
| ), | |
| ); | |
| } | |
| } |
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