sd/source/ui/slideshow/SlideShowRestarter.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20
  21 #include "slideshow.hxx"
  22 #include "ViewShellBase.hxx"
  23 #include <rtl/ref.hxx>
  24 #include <tools/link.hxx>
  25 #include <boost/enable_shared_from_this.hpp>
  26
  27 namespace sd {
  28
  29 /** This class is used when a display is removed or added to restart the
  30     slide show.  This is necessary at least with DirectX because
  31     deactivating a display invalidates DirectX resources.  Accessing those
  32     leads to a crash.
  33
  34     During a restart a possibly installed presenter extension is given the
  35     oportunity to show or hide depending on the number of available displays.
  36 */
  37 class SlideShowRestarter
  38     : public boost::enable_shared_from_this<SlideShowRestarter>
  39 {
  40 public:
  41     /** Create a new SlideShowRestarter object.
  42         @param rpSlideShow
  43             The slide show is used to determine the current slide, which is
  44             restored after the restart, and of course to stop and start the
  45             slide show.
  46         @param pViewShellBase
  47             Used to get access to a slot dispatcher.
  48     */
  49     SlideShowRestarter (
  50         const ::rtl::Reference<SlideShow>& rpSlideShow,
  51         ViewShellBase* pViewShellBase);
  52     virtual ~SlideShowRestarter (void);
  53
  54     /** Restarting the slide show is an asynchronous multi step process
  55         which is started by calling this method.
  56         @param bForce
  57            Used to force a re-start, even if the display count is unchanged.
  58     */
  59     void Restart (bool bForce);
  60
  61 private:
  62     sal_Int32 mnEventId;
  63     ::rtl::Reference<SlideShow> mpSlideShow;
  64     ViewShellBase* mpViewShellBase;
  65     ::boost::shared_ptr<SlideShowRestarter> mpSelf;
  66     sal_Int32 mnDisplayCount;
  67     SfxDispatcher* mpDispatcher;
  68     sal_Int32 mnCurrentSlideNumber;
  69
  70     /** The display count is used to determine whether the number of
  71         displays has changed and thus whether restarting the slide show is
  72         really necessary.
  73     */
  74     sal_Int32 GetDisplayCount (void);
  75
  76     DECL_LINK(EndPresentation, void*);
  77
  78     /** Restart the presentation on the slide last shown before the restart
  79         was initiated.
  80     */
  81     void StartPresentation (void);
  82 };
  83
  84 } // end of namespace sd
  85
  86 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */