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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_ACCELERATORS_MODIFIER_KEY_COMBO_RECORDER_H_
#define ASH_ACCELERATORS_MODIFIER_KEY_COMBO_RECORDER_H_
#include <array>
#include "ash/ash_export.h"
#include "ash/events/prerewritten_event_forwarder.h"
#include "ui/events/event.h"
#include "ui/events/event_constants.h"
#include "ui/events/event_handler.h"
namespace ash {
// Emits a metric for what keys a user presses on their keyboard. It categorizes
// in broad categories like "Alphabetic" or "Numpad" including their modifiers
// within the computed metric hash.
class ASH_EXPORT ModifierKeyComboRecorder
: public PrerewrittenEventForwarder::Observer {
public:
enum class ModifierLocation { kLeft, kRight };
enum class Modifier {
kMeta,
kControl,
kAlt,
kShift,
kMaxValue = kShift,
};
enum class ModifierFlag : uint8_t {
kMetaLeft,
kMetaRight,
kControlLeft,
kControlRight,
kAltLeft,
kAltRight,
kShiftLeft,
kShiftRight,
kAltGr,
kFunction,
kMaxValue = kFunction,
};
ModifierKeyComboRecorder();
ModifierKeyComboRecorder(const ModifierKeyComboRecorder&) = delete;
ModifierKeyComboRecorder& operator=(const ModifierKeyComboRecorder&) = delete;
~ModifierKeyComboRecorder() override;
void Initialize();
// ui::PrerewrittenEventForwarder::Observer:
void OnPrerewriteKeyInputEvent(const ui::KeyEvent& event) override;
private:
uint32_t GenerateModifierFlagsFromKeyEvent(const ui::KeyEvent& event);
uint32_t GetModifierFlagFromModifier(Modifier modifier);
void UpdateModifierLocations(const ui::KeyEvent& event);
// Contains which location (left or right) for each modifier that was last
// pressed.
std::array<ModifierLocation, static_cast<uint32_t>(Modifier::kMaxValue) + 1>
modifier_locations_{ModifierLocation::kLeft};
bool initialized_ = false;
};
} // namespace ash
#endif // ASH_ACCELERATORS_MODIFIER_KEY_COMBO_RECORDER_H_
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