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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_EVENTS_KEYBOARD_EVENT_COUNTER_H_
#define UI_EVENTS_KEYBOARD_EVENT_COUNTER_H_
#include <stddef.h>
#include <atomic>
#include <set>
#include "ui/events/events_export.h"
#include "ui/events/keycodes/keyboard_codes.h"
#include "ui/events/types/event_type.h"
namespace ui {
// This class tracks the total number of keypresses based on the OnKeyboardEvent
// calls it receives from the client.
// Multiple key down events for the same key are counted as one keypress until
// the same key is released.
class EVENTS_EXPORT KeyboardEventCounter {
public:
KeyboardEventCounter();
KeyboardEventCounter(const KeyboardEventCounter&) = delete;
KeyboardEventCounter& operator=(const KeyboardEventCounter&) = delete;
~KeyboardEventCounter();
// Returns the total number of keypresses since its creation.
// Can be called on any thread.
uint32_t GetKeyPressCount() const;
// The client should call this method on key down or key up events.
// Must be called on a single thread.
void OnKeyboardEvent(EventType event, KeyboardCode key_code);
private:
// The set of keys currently held down.
std::set<KeyboardCode> pressed_keys_;
std::atomic<uint32_t> total_key_presses_;
};
} // namespace ui
#endif // UI_EVENTS_KEYBOARD_EVENT_COUNTER_H_
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