| // Copyright 2015 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 COMPONENTS_EXO_SURFACE_OBSERVER_H_ |
| #define COMPONENTS_EXO_SURFACE_OBSERVER_H_ |
| |
| namespace exo { |
| class Surface; |
| |
| // Observers can listen to various events on the Surfaces. |
| class SurfaceObserver { |
| public: |
| // Called at the top of the surface's destructor, to give observers a |
| // chance to remove themselves. |
| virtual void OnSurfaceDestroying(Surface* surface) = 0; |
| |
| protected: |
| virtual ~SurfaceObserver() {} |
| }; |
| |
| } // namespace exo |
| |
| #endif // COMPONENTS_EXO_SURFACE_OBSERVER_H_ |