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// Copyright 2013 The Chromium 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 MEDIA_BASE_KEYBOARD_EVENT_COUNTER_H_
#define MEDIA_BASE_KEYBOARD_EVENT_COUNTER_H_
#include <stddef.h>
#include <set>
#include "base/macros.h"
#include "base/synchronization/lock.h"
#include "media/base/media_export.h"
#include "ui/events/event_constants.h"
#include "ui/events/keycodes/keyboard_codes.h"
namespace media {
// 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 MEDIA_EXPORT KeyboardEventCounter {
public:
KeyboardEventCounter();
~KeyboardEventCounter();
// Resets the count to 0. Must be called on the same thread as
// OnKeyboardEvent.
void Reset();
// Returns the total number of keypresses since its creation or last Reset()
// call. Can be called on any thread.
size_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(ui::EventType event, ui::KeyboardCode key_code);
private:
// The set of keys currently held down.
std::set<ui::KeyboardCode> pressed_keys_;
size_t total_key_presses_;
DISALLOW_COPY_AND_ASSIGN(KeyboardEventCounter);
};
} // namespace media
#endif // MEDIA_BASE_KEYBOARD_EVENT_COUNTER_H_
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