// 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 UI_AURA_CLIENT_VISIBILITY_CLIENT_H_
#define UI_AURA_CLIENT_VISIBILITY_CLIENT_H_
#include "ui/aura/aura_export.h"
namespace aura {
class Window;
namespace client {
// An interface implemented by an object that manages the visibility of Windows'
// layers as Window visibility changes.
class AURA_EXPORT VisibilityClient {
public:
// Called when |window|'s visibility is changing to |visible|. The implementor
// can decide whether or not to pass on the visibility to the underlying
// layer.
virtual void UpdateLayerVisibility(Window* window, bool visible) = 0;
protected:
virtual ~VisibilityClient() {}
};
// Sets the VisibilityClient on the Window.
AURA_EXPORT void SetVisibilityClient(Window* window, VisibilityClient* client);
// Gets the VisibilityClient for the window. This will crawl up |window|'s
// hierarchy until it finds one.
AURA_EXPORT VisibilityClient* GetVisibilityClient(Window* window);
} // namespace clients
} // namespace aura
#endif // UI_AURA_CLIENT_VISIBILITY_CLIENT_H_