1// Copyright 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "media/base/keyboard_event_counter.h"
6
7#include "base/atomicops.h"
8#include "base/logging.h"
9
10namespace media {
11
12KeyboardEventCounter::KeyboardEventCounter() : total_key_presses_(0) {}
13
14KeyboardEventCounter::~KeyboardEventCounter() {}
15
16void KeyboardEventCounter::Reset() {
17  pressed_keys_.clear();
18  base::subtle::NoBarrier_Store(
19      reinterpret_cast<base::subtle::AtomicWord*>(&total_key_presses_), 0);
20}
21
22void KeyboardEventCounter::OnKeyboardEvent(ui::EventType event,
23                                           ui::KeyboardCode key_code) {
24  // Updates the pressed keys and the total count of key presses.
25  if (event == ui::ET_KEY_PRESSED) {
26    if (pressed_keys_.find(key_code) != pressed_keys_.end())
27      return;
28    pressed_keys_.insert(key_code);
29    base::subtle::NoBarrier_AtomicIncrement(
30        reinterpret_cast<base::subtle::AtomicWord*>(&total_key_presses_), 1);
31  } else {
32    DCHECK_EQ(ui::ET_KEY_RELEASED, event);
33    pressed_keys_.erase(key_code);
34  }
35}
36
37size_t KeyboardEventCounter::GetKeyPressCount() const {
38  return base::subtle::NoBarrier_Load(
39      reinterpret_cast<const base::subtle::AtomicWord*>(&total_key_presses_));
40}
41
42}  // namespace media
43