device/core/device_monitor_win.h

   1 // Copyright 2014 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 #ifndef DEVICE_CORE_DEVICE_MONITOR_WIN_H_
   6 #define DEVICE_CORE_DEVICE_MONITOR_WIN_H_
   7
   8 #include <windows.h>
   9
  10 #include "base/observer_list.h"
  11
  12 namespace device {
  13
  14 // Use an instance of this class to observe devices being added and removed
  15 // from the system, matched by device interface GUID.
  16 class DeviceMonitorWin {
  17  public:
  18   class Observer {
  19    public:
  20     virtual void OnDeviceAdded(const std::string& device_path);
  21     virtual void OnDeviceRemoved(const std::string& device_path);
  22   };
  23
  24   ~DeviceMonitorWin();
  25
  26   static DeviceMonitorWin* GetForDeviceInterface(const GUID& guid);
  27
  28   void AddObserver(Observer* observer);
  29   void RemoveObserver(Observer* observer);
  30
  31  private:
  32   friend class DeviceMonitorMessageWindow;
  33
  34   DeviceMonitorWin(HDEVNOTIFY notify_handle);
  35
  36   void NotifyDeviceAdded(const std::string& device_path);
  37   void NotifyDeviceRemoved(const std::string& device_path);
  38
  39   ObserverList<Observer> observer_list_;
  40   HDEVNOTIFY notify_handle_;
  41 };
  42 }
  43
  44 #endif  // DEVICE_CORE_DEVICE_MONITOR_WIN_H_