include/svx/e3dsceneupdater.hxx

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  19
  20 #ifndef INCLUDED_SVX_E3DSCENEUPDATER_HXX
  21 #define INCLUDED_SVX_E3DSCENEUPDATER_HXX
  22
  23 #include <svx/svxdllapi.h>
  24 #include <memory>
  25
  26 class SdrObject;
  27 class E3dScene;
  28
  29 namespace drawinglayer { namespace geometry {
  30     class ViewInformation3D;
  31 }}
  32
  33 /** Helper for 3d object changes affecting 2d geometry
  34
  35    This class is a helper to encapsulate 3D object changes which shall
  36    change the scene's 2D geometry. E.g. when moving one 3D object in a
  37    scene, the visualisation would not change since the scene's 2D
  38    attributes are defined by its 2D object transformation and the
  39    changed content would be projected to the same 2D bounds as
  40    before. To reflect the fact that the 2D positions may 'change' for
  41    the user's imagination, it is necessary to calculate a new 2D
  42    object transformation of the scene (the SnapRect) using the old 3D
  43    transformation stack and the possibly modified 3D content and to
  44    use it. This is only desirable if changes to the scene's content
  45    are intended to change the scene's 2D geometry attributes
  46 */
  47 class SVX_DLLPUBLIC E3DModifySceneSnapRectUpdater
  48 {
  49     // the scene which may be changed. This gets set to the outmost scene
  50     // of the to-be-changed 3D object when the scene has a 3d transformation
  51     // stack at construction time. In all other cases it's set to zero and
  52     // no action needs to be taken
  53     E3dScene*       mpScene;
  54
  55     // the 3d transformation stack at the time of construction, valid when
  56     // mpScene is not zero
  57     std::unique_ptr<drawinglayer::geometry::ViewInformation3D>  mpViewInformation3D;
  58
  59 public:
  60     // the constructor evaluates and sets the members at construction time
  61     E3DModifySceneSnapRectUpdater(const SdrObject* mpObject);
  62
  63     // the destructor will take action if mpScene is not zero and modify the
  64     // 2D geometry of the target scene
  65     ~E3DModifySceneSnapRectUpdater();
  66 };
  67
  68 #endif // INCLUDED_SVX_E3DSCENEUPDATER_HXX
  69
  70 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */