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 43
