| // 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/foundation.dart'; |
| import 'package:flutter/material.dart'; |
| import 'package:flutter/services.dart'; |
| |
| void main() { |
| runApp(MaterialApp( |
| title: 'Hardware Key Demo', |
| home: Scaffold( |
| appBar: AppBar( |
| title: const Text('Hardware Key Demo'), |
| ), |
| body: const Center( |
| child: RawKeyboardDemo(), |
| ), |
| ), |
| )); |
| } |
| |
| class RawKeyboardDemo extends StatefulWidget { |
| const RawKeyboardDemo({Key key}) : super(key: key); |
| |
| @override |
| _HardwareKeyDemoState createState() => _HardwareKeyDemoState(); |
| } |
| |
| class _HardwareKeyDemoState extends State<RawKeyboardDemo> { |
| final FocusNode _focusNode = FocusNode(); |
| RawKeyEvent _event; |
| |
| @override |
| void dispose() { |
| _focusNode.dispose(); |
| super.dispose(); |
| } |
| |
| bool _handleKeyEvent(FocusNode node, RawKeyEvent event) { |
| setState(() { |
| _event = event; |
| }); |
| return false; |
| } |
| |
| String _asHex(int value) => value != null ? '0x${value.toRadixString(16)}' : 'null'; |
| |
| String _getEnumName(dynamic enumItem) { |
| final String name = '$enumItem'; |
| final int index = name.indexOf('.'); |
| return index == -1 ? name : name.substring(index + 1); |
| } |
| |
| @override |
| Widget build(BuildContext context) { |
| final TextTheme textTheme = Theme.of(context).textTheme; |
| return Focus( |
| focusNode: _focusNode, |
| onKey: _handleKeyEvent, |
| autofocus: true, |
| child: AnimatedBuilder( |
| animation: _focusNode, |
| builder: (BuildContext context, Widget child) { |
| if (!_focusNode.hasFocus) { |
| return GestureDetector( |
| onTap: () { |
| _focusNode.requestFocus(); |
| }, |
| child: Text('Tap to focus', style: textTheme.headline4), |
| ); |
| } |
| |
| if (_event == null) { |
| return Text('Press a key', style: textTheme.headline4); |
| } |
| |
| final RawKeyEventData data = _event.data; |
| final String modifierList = data.modifiersPressed.keys.map<String>(_getEnumName).join(', ').replaceAll('Modifier', ''); |
| final List<Widget> dataText = <Widget>[ |
| Text('${_event.runtimeType}'), |
| Text('modifiers set: $modifierList'), |
| ]; |
| if (data is RawKeyEventDataAndroid) { |
| const int combiningCharacterMask = 0x7fffffff; |
| final String codePointChar = String.fromCharCode(combiningCharacterMask & data.codePoint); |
| dataText.add(Text('codePoint: ${data.codePoint} (${_asHex(data.codePoint)}: $codePointChar)')); |
| final String plainCodePointChar = String.fromCharCode(combiningCharacterMask & data.plainCodePoint); |
| dataText.add(Text('plainCodePoint: ${data.plainCodePoint} (${_asHex(data.plainCodePoint)}: $plainCodePointChar)')); |
| dataText.add(Text('keyCode: ${data.keyCode} (${_asHex(data.keyCode)})')); |
| dataText.add(Text('scanCode: ${data.scanCode} (${_asHex(data.scanCode)})')); |
| dataText.add(Text('metaState: ${data.metaState} (${_asHex(data.metaState)})')); |
| dataText.add(Text('source: ${data.eventSource} (${_asHex(data.eventSource)})')); |
| dataText.add(Text('vendorId: ${data.vendorId} (${_asHex(data.vendorId)})')); |
| dataText.add(Text('productId: ${data.productId} (${_asHex(data.productId)})')); |
| dataText.add(Text('flags: ${data.flags} (${_asHex(data.flags)})')); |
| dataText.add(Text('repeatCount: ${data.repeatCount} (${_asHex(data.repeatCount)})')); |
| } else if (data is RawKeyEventDataFuchsia) { |
| dataText.add(Text('codePoint: ${data.codePoint} (${_asHex(data.codePoint)})')); |
| dataText.add(Text('hidUsage: ${data.hidUsage} (${_asHex(data.hidUsage)})')); |
| dataText.add(Text('modifiers: ${data.modifiers} (${_asHex(data.modifiers)})')); |
| } else if (data is RawKeyEventDataMacOs) { |
| dataText.add(Text('keyCode: ${data.keyCode} (${_asHex(data.keyCode)})')); |
| dataText.add(Text('characters: ${data.characters}')); |
| dataText.add(Text('charactersIgnoringModifiers: ${data.charactersIgnoringModifiers}')); |
| dataText.add(Text('modifiers: ${data.modifiers} (${_asHex(data.modifiers)})')); |
| } else if (data is RawKeyEventDataLinux) { |
| dataText.add(Text('keyCode: ${data.keyCode} (${_asHex(data.keyCode)})')); |
| dataText.add(Text('scanCode: ${data.scanCode}')); |
| dataText.add(Text('unicodeScalarValues: ${data.unicodeScalarValues}')); |
| dataText.add(Text('modifiers: ${data.modifiers} (${_asHex(data.modifiers)})')); |
| } else if (data is RawKeyEventDataWindows) { |
| dataText.add(Text('keyCode: ${data.keyCode} (${_asHex(data.keyCode)})')); |
| dataText.add(Text('scanCode: ${data.scanCode}')); |
| dataText.add(Text('characterCodePoint: ${data.characterCodePoint}')); |
| dataText.add(Text('modifiers: ${data.modifiers} (${_asHex(data.modifiers)})')); |
| } |
| dataText.add(Text('logical: ${_event.logicalKey}')); |
| dataText.add(Text('physical: ${_event.physicalKey}')); |
| if (_event.character != null) { |
| dataText.add(Text('character: ${_event.character}')); |
| } |
| for (final ModifierKey modifier in data.modifiersPressed.keys) { |
| for (final KeyboardSide side in KeyboardSide.values) { |
| if (data.isModifierPressed(modifier, side: side)) { |
| dataText.add( |
| Text('${_getEnumName(side)} ${_getEnumName(modifier).replaceAll('Modifier', '')} pressed'), |
| ); |
| } |
| } |
| } |
| final List<String> pressed = <String>['Pressed:']; |
| for (final LogicalKeyboardKey key in RawKeyboard.instance.keysPressed) { |
| pressed.add(key.debugName); |
| } |
| dataText.add(Text(pressed.join(' '))); |
| return DefaultTextStyle( |
| style: textTheme.subtitle1, |
| child: Column( |
| mainAxisAlignment: MainAxisAlignment.center, |
| children: dataText, |
| ), |
| ); |
| }, |
| ), |
| ); |
| } |
| } |