sd/source/ui/slideshow/SlideShowRestarter.hxx

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  27
  28 #include "precompiled_sd.hxx"
  29
  30 #include "slideshow.hxx"
  31 #include "ViewShellBase.hxx"
  32 #include <rtl/ref.hxx>
  33 #include <tools/link.hxx>
  34 #include <boost/enable_shared_from_this.hpp>
  35
  36 namespace sd {
  37
  38 /** This class is used when a display is removed or added to restart the
  39     slide show.  This is necessary at least with DirectX because
  40     deactivating a display invalidates DirectX resources.  Accessing those
  41     leads to a crash.
  42
  43     During a restart a possibly installed presenter extension is given the
  44     oportunity to show or hide depending on the number of available displays.
  45 */
  46 class SlideShowRestarter
  47     : public boost::enable_shared_from_this<SlideShowRestarter>
  48 {
  49 public:
  50     /** Create a new SlideShowRestarter object.
  51         @param rpSlideShow
  52             The slide show is used to determine the current slide, which is
  53             restored after the restart, and of course to stop and start the
  54             slide show.
  55         @param pViewShellBase
  56             Used to get access to a slot dispatcher.
  57     */
  58     SlideShowRestarter (
  59         const ::rtl::Reference<SlideShow>& rpSlideShow,
  60         ViewShellBase* pViewShellBase);
  61     virtual ~SlideShowRestarter (void);
  62
  63     /** Restarting the slide show is an asynchronous multi step process
  64         which is started by calling this method.
  65     */
  66     void Restart (void);
  67
  68 private:
  69     sal_Int32 mnEventId;
  70     ::rtl::Reference<SlideShow> mpSlideShow;
  71     ViewShellBase* mpViewShellBase;
  72     ::boost::shared_ptr<SlideShowRestarter> mpSelf;
  73     sal_Int32 mnDisplayCount;
  74     SfxDispatcher* mpDispatcher;
  75     sal_Int32 mnCurrentSlideNumber;
  76
  77     /** The display count is used to determine whether the number of
  78         displays has changed and thus whether restarting the slide show is
  79         really necessary.
  80     */
  81     sal_Int32 GetDisplayCount (void);
  82
  83     DECL_LINK(EndPresentation, void*);
  84
  85     /** Restart the presentation on the slide last shown before the restart
  86         was initiated.
  87     */
  88     void StartPresentation (void);
  89 };
  90
  91 } // end of namespace sd