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: Observer()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; DeviceAdded(int device_id)41 virtual void DeviceAdded(int device_id) OVERRIDE {} DeviceRemoved(int device_id)42 virtual void DeviceRemoved(int device_id) OVERRIDE {} DeviceKeyPressedOrReleased(int device_id)43 virtual void DeviceKeyPressedOrReleased(int device_id) OVERRIDE {} 44 45 // Check for pointer devices. 46 void CheckTouchpadExists(); 47 void CheckMouseExists(); 48 49 // Callback for pointer device checks. 50 void OnTouchpadExists(bool exists); 51 void OnMouseExists(bool exists); 52 53 ObserverList<Observer> observers_; 54 55 base::WeakPtrFactory<PointerDeviceObserver> weak_factory_; 56 57 DISALLOW_COPY_AND_ASSIGN(PointerDeviceObserver); 58 }; 59 60 } // namespace system 61 } // namespace chromeos 62 63 #endif // CHROME_BROWSER_CHROMEOS_SYSTEM_POINTER_DEVICE_OBSERVER_H_ 64