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// Copyright 2021 The Chromium Authors
// 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_SUB_SURFACE_OBSERVER_H_
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