| // Copyright 2021 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_SUB_SURFACE_OBSERVER_H_ |
| #define COMPONENTS_EXO_SUB_SURFACE_OBSERVER_H_ |
| |
| #include "base/observer_list_types.h" |
| |
| namespace exo { |
| class SubSurface; |
| |
| // Observers can listen to various events on the SubSurfaces. |
| class SubSurfaceObserver : public base::CheckedObserver { |
| public: |
| // Called at the top of the sub-surface's destructor, to give observers a |
| // chance to remove themselves. |
| virtual void OnSubSurfaceDestroying(SubSurface* sub_surface) = 0; |
| |
| protected: |
| ~SubSurfaceObserver() override = default; |
| }; |
| |
| } // namespace exo |
| |
| #endif // COMPONENTS_EXO_SURFACE_OBSERVER_H_ |