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