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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/accelerators/accelerator_encoding.h"
#include "base/check.h"
#include "ui/events/event_constants.h"
#include "ui/events/keycodes/keyboard_codes.h"
namespace ash {
// The encoding schema is as the following:
//
// - The low 16 bits represent the key code.
// - The modifiers are stored in the high 16 bits. Only the following 4 bits are
// being used:
// - The 31 bit: Command key
// - The 30 bit: Alt key
// - The 29 bit: Control key
// - The 28 bit: Shift key
//
// Examples:
// ctrl+Z: 0001'0000'0000'0000'0000'0000'0101'1010
// alt+shift+A: 0010'1000'0000'0000'0000'0000'0100'0001
int GetEncodedShortcut(const int modifiers, const ui::KeyboardCode key_code) {
// EF_SHIFT_DOWN: 28th bit.
const int kShiftDown = 1 << 27;
// EF_CONTROL_DOWN: 29th bit.
const int kControlDown = 1 << 28;
// EF_ALT_DOWN: 30th bit.
const int kAltDown = 1 << 29;
// EF_COMMAND_DOWN: 31th bit.
const int kCommandDown = 1 << 30;
int encoded_modifier = 0;
if ((modifiers & ui::EF_SHIFT_DOWN) != 0) {
encoded_modifier |= kShiftDown;
}
if ((modifiers & ui::EF_CONTROL_DOWN) != 0) {
encoded_modifier |= kControlDown;
}
if ((modifiers & ui::EF_ALT_DOWN) != 0) {
encoded_modifier |= kAltDown;
}
if ((modifiers & ui::EF_COMMAND_DOWN) != 0) {
encoded_modifier |= kCommandDown;
}
// Currently KeyboardCode only has 2^8 values. It will be a long time until we
// get to 2^16. But if KeyboardCode has 2^28+ values for some reason, the top
// 5 bits will be overwritten.
DCHECK((0xF800 & key_code) == 0);
return encoded_modifier | key_code;
}
} // namespace ash
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