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// 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;
// Called when the occlusion of the aura window corresponding to |surface|
// changes.
virtual void OnWindowOcclusionChanged(Surface* surface) {}
// Called on each commit.
virtual void OnCommit(Surface* surface) {}
protected:
virtual ~SurfaceObserver() {}
};
} // namespace exo
#endif // COMPONENTS_EXO_SURFACE_OBSERVER_H_
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