sd/source/ui/slideshow/SlideShowRestarter.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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   9  * This file incorporates work covered by the following license notice:
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  12  *   contributor license agreements. See the NOTICE file distributed
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  18  */
  19
  20 #ifndef INCLUDED_SD_SOURCE_UI_SLIDESHOW_SLIDESHOWRESTARTER_HXX
  21 #define INCLUDED_SD_SOURCE_UI_SLIDESHOW_SLIDESHOWRESTARTER_HXX
  22
  23 #include "slideshow.hxx"
  24 #include "ViewShellBase.hxx"
  25 #include <rtl/ref.hxx>
  26 #include <tools/link.hxx>
  27 #include <boost/enable_shared_from_this.hpp>
  28
  29 namespace sd {
  30
  31 /** This class is used when a display is removed or added to restart the
  32     slide show.  This is necessary at least with DirectX because
  33     deactivating a display invalidates DirectX resources.  Accessing those
  34     leads to a crash.
  35
  36     During a restart a possibly installed presenter extension is given the
  37     opportunity to show or hide depending on the number of available displays.
  38 */
  39 class SlideShowRestarter
  40     : public boost::enable_shared_from_this<SlideShowRestarter>
  41 {
  42 public:
  43     /** Create a new SlideShowRestarter object.
  44         @param rpSlideShow
  45             The slide show is used to determine the current slide, which is
  46             restored after the restart, and of course to stop and start the
  47             slide show.
  48         @param pViewShellBase
  49             Used to get access to a slot dispatcher.
  50     */
  51     SlideShowRestarter (
  52         const ::rtl::Reference<SlideShow>& rpSlideShow,
  53         ViewShellBase* pViewShellBase);
  54     virtual ~SlideShowRestarter();
  55
  56     /** Restarting the slide show is an asynchronous multi step process
  57         which is started by calling this method.
  58         @param bForce
  59            Used to force a re-start, even if the display count is unchanged.
  60     */
  61     void Restart (bool bForce);
  62
  63 private:
  64     ImplSVEvent * mnEventId;
  65     ::rtl::Reference<SlideShow> mpSlideShow;
  66     ViewShellBase* mpViewShellBase;
  67     ::boost::shared_ptr<SlideShowRestarter> mpSelf;
  68     sal_Int32 mnDisplayCount;
  69     SfxDispatcher* mpDispatcher;
  70     sal_Int32 mnCurrentSlideNumber;
  71
  72     /** The display count is used to determine whether the number of
  73         displays has changed and thus whether restarting the slide show is
  74         really necessary.
  75     */
  76     sal_Int32 GetDisplayCount();
  77
  78     DECL_LINK(EndPresentation, void*);
  79
  80     /** Restart the presentation on the slide last shown before the restart
  81         was initiated.
  82     */
  83     void StartPresentation();
  84 };
  85
  86 } // end of namespace sd
  87
  88 #endif // INCLUDED_SD_SOURCE_UI_SLIDESHOW_SLIDESHOWRESTARTER_HXX
  89
  90 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */