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      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
     75