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 "ui/events/devices/input_device_event_observer.h"
  11
  12 namespace chromeos {
  13 namespace system {
  14
  15 class PointerDeviceObserver : public ui::InputDeviceEventObserver {
  16  public:
  17   PointerDeviceObserver();
  18   ~PointerDeviceObserver() override;
  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   // InputDeviceEventObserver:
  40   void OnMouseDeviceConfigurationChanged() override;
  41   void OnTouchpadDeviceConfigurationChanged() override;
  42
  43   // Check for pointer devices.
  44   void CheckTouchpadExists();
  45   void CheckMouseExists();
  46
  47   // Callback for pointer device checks.
  48   void OnTouchpadExists(bool exists);
  49   void OnMouseExists(bool exists);
  50
  51   base::ObserverList<Observer> observers_;
  52
  53   base::WeakPtrFactory<PointerDeviceObserver> weak_factory_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(PointerDeviceObserver);
  56 };
  57
  58 }  // namespace system
  59 }  // namespace chromeos
  60
  61 #endif  // CHROME_BROWSER_CHROMEOS_SYSTEM_POINTER_DEVICE_OBSERVER_H_