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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_SVX_E3DSCENEUPDATER_HXX
+#define INCLUDED_SVX_E3DSCENEUPDATER_HXX
+
+#include <svx/svxdllapi.h>
+#include <memory>
+
+class SdrObject;
+class E3dScene;
+
+namespace drawinglayer::geometry {
+ class ViewInformation3D;
+}
+
+/** Helper for 3d object changes affecting 2d geometry
+
+ This class is a helper to encapsulate 3D object changes which shall
+ change the scene's 2D geometry. E.g. when moving one 3D object in a
+ scene, the visualisation would not change since the scene's 2D
+ attributes are defined by its 2D object transformation and the
+ changed content would be projected to the same 2D bounds as
+ before. To reflect the fact that the 2D positions may 'change' for
+ the user's imagination, it is necessary to calculate a new 2D
+ object transformation of the scene (the SnapRect) using the old 3D
+ transformation stack and the possibly modified 3D content and to
+ use it. This is only desirable if changes to the scene's content
+ are intended to change the scene's 2D geometry attributes
+*/
+class SVXCORE_DLLPUBLIC E3DModifySceneSnapRectUpdater
+{
+ // the scene which may be changed. This gets set to the outmost scene
+ // of the to-be-changed 3D object when the scene has a 3d transformation
+ // stack at construction time. In all other cases it's set to zero and
+ // no action needs to be taken
+ E3dScene* mpScene;
+
+ // the 3d transformation stack at the time of construction, valid when
+ // mpScene is not zero
+ std::unique_ptr<drawinglayer::geometry::ViewInformation3D> mpViewInformation3D;
+
+public:
+ // the constructor evaluates and sets the members at construction time
+ E3DModifySceneSnapRectUpdater(const SdrObject* mpObject);
+
+ // the destructor will take action if mpScene is not zero and modify the
+ // 2D geometry of the target scene
+ ~E3DModifySceneSnapRectUpdater();
+};
+
+#endif // INCLUDED_SVX_E3DSCENEUPDATER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */