/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
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#ifndef INCLUDED_SVX_E3DSCENEUPDATER_HXX
#define INCLUDED_SVX_E3DSCENEUPDATER_HXX

#include <svx/svxdllapi.h>

class SdrObject;
class E3dScene;

namespace drawinglayer { namespace 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 SVX_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
    drawinglayer::geometry::ViewInformation3D*  mpViewInformation3D;

public:
    // the constructor evaluates and sets the members at construction time
    E3DModifySceneSnapRectUpdater(const SdrObject* pObject);

    // the destructor will take action if mpScene is not zero and modify the
    // 2D geomeztry of the target scene
    ~E3DModifySceneSnapRectUpdater();
};

#endif // INCLUDED_SVX_E3DSCENEUPDATER_HXX

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