media/base/user_input_monitor.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/user_input_monitor.h"
   6
   7 #include "base/logging.h"
   8
   9 namespace media {
  10
  11 #ifdef DISABLE_USER_INPUT_MONITOR
  12 scoped_ptr<UserInputMonitor> UserInputMonitor::Create(
  13     const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner,
  14     const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner) {
  15   return scoped_ptr<UserInputMonitor>();
  16 }
  17 #endif  // DISABLE_USER_INPUT_MONITOR
  18
  19 UserInputMonitor::UserInputMonitor()
  20     : key_press_counter_references_(0),
  21       mouse_listeners_count_(0),
  22       mouse_listeners_(new MouseListenerList()) {}
  23
  24 UserInputMonitor::~UserInputMonitor() {
  25   DCHECK_EQ(0u, key_press_counter_references_);
  26   mouse_listeners_->AssertEmpty();
  27 }
  28
  29 void UserInputMonitor::AddMouseListener(MouseEventListener* listener) {
  30   mouse_listeners_->AddObserver(listener);
  31   {
  32     base::AutoLock auto_lock(lock_);
  33     mouse_listeners_count_++;
  34     if (mouse_listeners_count_ == 1) {
  35       StartMouseMonitoring();
  36       DVLOG(2) << "Started mouse monitoring.";
  37     }
  38   }
  39 }
  40
  41 void UserInputMonitor::RemoveMouseListener(MouseEventListener* listener) {
  42   mouse_listeners_->RemoveObserver(listener);
  43   {
  44     base::AutoLock auto_lock(lock_);
  45     DCHECK_NE(mouse_listeners_count_, 0u);
  46     mouse_listeners_count_--;
  47     if (mouse_listeners_count_ == 0) {
  48       StopMouseMonitoring();
  49       DVLOG(2) << "Stopped mouse monitoring.";
  50     }
  51   }
  52 }
  53
  54 void UserInputMonitor::EnableKeyPressMonitoring() {
  55   base::AutoLock auto_lock(lock_);
  56   ++key_press_counter_references_;
  57   if (key_press_counter_references_ == 1) {
  58     StartKeyboardMonitoring();
  59     DVLOG(2) << "Started keyboard monitoring.";
  60   }
  61 }
  62
  63 void UserInputMonitor::DisableKeyPressMonitoring() {
  64   base::AutoLock auto_lock(lock_);
  65   DCHECK_NE(key_press_counter_references_, 0u);
  66   --key_press_counter_references_;
  67   if (key_press_counter_references_ == 0) {
  68     StopKeyboardMonitoring();
  69     DVLOG(2) << "Stopped keyboard monitoring.";
  70   }
  71 }
  72
  73 }  // namespace media