| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CHROME_BROWSER_CHROMEOS_DEVICE_HIERARCHY_OBSERVER_H_ |
| #define CHROME_BROWSER_CHROMEOS_DEVICE_HIERARCHY_OBSERVER_H_ |
| |
| namespace chromeos { |
| |
| // Observers receive notifications when a device has been added/removed. |
| class DeviceHierarchyObserver { |
| public: |
| virtual void DeviceHierarchyChanged() = 0; |
| |
| // Called when a new device (e.g. an external USB keyboard) is attached or |
| // detached. |
| virtual void DeviceAdded(int device_id) = 0; |
| virtual void DeviceRemoved(int device_id) = 0; |
| |
| protected: |
| virtual ~DeviceHierarchyObserver() {} |
| }; |
| |
| } // namespace chromeos |
| |
| #endif // CHROME_BROWSER_CHROMEOS_DEVICE_HIERARCHY_OBSERVER_H_ |