media/base/keyboard_event_counter.cc

   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
  10 namespace media {
  11
  12 KeyboardEventCounter::KeyboardEventCounter() : total_key_presses_(0) {}
  13
  14 KeyboardEventCounter::~KeyboardEventCounter() {}
  15
  16 void KeyboardEventCounter::Reset() {
  17   pressed_keys_.clear();
  18   base::subtle::NoBarrier_Store(
  19       reinterpret_cast<base::subtle::AtomicWord*>(&total_key_presses_), 0);
  20 }
  21
  22 void 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
  37 size_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