| // Copyright 2013 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. |
| |
| #ifndef FLUTTER_SHELL_PLATFORM_WINDOWS_KEYBOARD_WIN32_COMMON_H_ |
| #define FLUTTER_SHELL_PLATFORM_WINDOWS_KEYBOARD_WIN32_COMMON_H_ |
| |
| #include <stdint.h> |
| |
| namespace flutter { |
| |
| // The bit of a mapped character in a WM_KEYDOWN message that indicates the |
| // character is a dead key. |
| // |
| // When a dead key is pressed, the WM_KEYDOWN's lParam is mapped to a special |
| // value: the "normal character" | 0x80000000. For example, when pressing |
| // "dead key caret" (one that makes the following e into ê), its mapped |
| // character is 0x8000005E. "Reverting" it gives 0x5E, which is character '^'. |
| constexpr int kDeadKeyCharMask = 0x80000000; |
| |
| // Revert the "character" for a dead key to its normal value, or the argument |
| // unchanged otherwise. |
| inline uint32_t UndeadChar(uint32_t ch) { |
| return ch & ~kDeadKeyCharMask; |
| } |
| |
| } // namespace flutter |
| |
| #endif // FLUTTER_SHELL_PLATFORM_WINDOWS_KEYBOARD_WIN32_COMMON_H_ |
