chrome/browser/chromeos/system/pointer_device_observer.h

   1 // Copyright (c) 2012 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 CHROME_BROWSER_CHROMEOS_SYSTEM_POINTER_DEVICE_OBSERVER_H_
   6 #define CHROME_BROWSER_CHROMEOS_SYSTEM_POINTER_DEVICE_OBSERVER_H_
   7
   8 #include "base/memory/weak_ptr.h"
   9 #include "base/observer_list.h"
  10 #include "chrome/browser/chromeos/device_hierarchy_observer.h"
  11
  12 namespace chromeos {
  13 namespace system {
  14
  15 class PointerDeviceObserver : public DeviceHierarchyObserver {
  16  public:
  17   PointerDeviceObserver();
  18   virtual ~PointerDeviceObserver();
  19
  20   // Start observing device hierarchy.
  21   void Init();
  22
  23   // Check for presence of devices.
  24   void CheckDevices();
  25
  26   class Observer {
  27    public:
  28     virtual void TouchpadExists(bool exists) = 0;
  29     virtual void MouseExists(bool exists) = 0;
  30
  31    protected:
  32     Observer() {}
  33     virtual ~Observer();
  34   };
  35   void AddObserver(Observer* observer);
  36   void RemoveObserver(Observer* observer);
  37
  38  private:
  39   // DeviceHierarchyObserver implementation.
  40   virtual void DeviceHierarchyChanged() OVERRIDE;
  41   virtual void DeviceAdded(int device_id) OVERRIDE {}
  42   virtual void DeviceRemoved(int device_id) OVERRIDE {}
  43
  44   // Check for pointer devices.
  45   void CheckTouchpadExists();
  46   void CheckMouseExists();
  47
  48   // Callback for pointer device checks.
  49   void OnTouchpadExists(bool exists);
  50   void OnMouseExists(bool exists);
  51
  52   ObserverList<Observer> observers_;
  53
  54   base::WeakPtrFactory<PointerDeviceObserver> weak_factory_;
  55
  56   DISALLOW_COPY_AND_ASSIGN(PointerDeviceObserver);
  57 };
  58
  59 }  // namespace system
  60 }  // namespace chromeos
  61
  62 #endif  // CHROME_BROWSER_CHROMEOS_SYSTEM_POINTER_DEVICE_OBSERVER_H_