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9956a35a5a
Rewrites tools/gen_keycodes, the script that generates key mappings across the framework and the engine.
76 lines
3.0 KiB
Dart
76 lines
3.0 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:path/path.dart' as path;
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import 'base_code_gen.dart';
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import 'logical_key_data.dart';
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import 'physical_key_data.dart';
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import 'utils.dart';
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/// Generates the key mapping for Windows, based on the information in the key
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/// data structure given to it.
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class WindowsCodeGenerator extends PlatformCodeGenerator {
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WindowsCodeGenerator(
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PhysicalKeyData keyData,
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LogicalKeyData logicalData,
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String scancodeToLogical,
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) : _scancodeToLogical = parseMapOfString(scancodeToLogical),
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super(keyData, logicalData);
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/// This generates the map of Windows scan codes to physical keys.
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String get _windowsScanCodeMap {
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final StringBuffer windowsScanCodeMap = StringBuffer();
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for (final PhysicalKeyEntry entry in keyData.entries) {
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if (entry.windowsScanCode != null) {
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windowsScanCodeMap.writeln(' {${toHex(entry.windowsScanCode)}, ${toHex(entry.usbHidCode)}}, // ${entry.constantName}');
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}
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}
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return windowsScanCodeMap.toString().trimRight();
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}
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/// This generates the map of Windows key codes to logical keys.
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String get _windowsLogicalKeyCodeMap {
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final StringBuffer result = StringBuffer();
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for (final LogicalKeyEntry entry in logicalData.entries) {
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zipStrict(entry.windowsValues, entry.windowsNames, (int windowsValue, String windowsName) {
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result.writeln(' {${toHex(windowsValue)}, ${toHex(entry.value, digits: 11)}}, // $windowsName');
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});
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}
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return result.toString().trimRight();
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}
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/// This generates the map from scan code to logical keys.
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///
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/// Normally logical keys should only be derived from key codes, but since some
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/// key codes are either 0 or ambiguous (multiple keys using the same key
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/// code), these keys are resolved by scan codes.
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String get _scanCodeToLogicalMap {
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final StringBuffer result = StringBuffer();
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_scancodeToLogical.forEach((String scanCodeName, String logicalName) {
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final PhysicalKeyEntry physicalEntry = keyData.entryByName(scanCodeName);
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final int logicalValue = logicalData.entryByName(logicalName).value;
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result.writeln(' {${toHex(physicalEntry.windowsScanCode)}, ${toHex(logicalValue, digits: 10)}}, // ${physicalEntry.name}');
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});
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return result.toString().trimRight();
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}
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final Map<String, String> _scancodeToLogical;
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@override
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String get templatePath => path.join(dataRoot, 'windows_flutter_key_map_cc.tmpl');
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@override
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String outputPath(String platform) => path.join(PlatformCodeGenerator.engineRoot,
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'shell', 'platform', 'windows', 'flutter_key_map.cc');
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@override
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Map<String, String> mappings() {
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return <String, String>{
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'WINDOWS_SCAN_CODE_MAP': _windowsScanCodeMap,
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'WINDOWS_SCAN_CODE_TO_LOGICAL_MAP': _scanCodeToLogicalMap,
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'WINDOWS_KEY_CODE_MAP': _windowsLogicalKeyCodeMap,
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};
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}
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}
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