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 #pragma once
  21
  22 #include <rtl/ref.hxx>
  23 #include <tools/link.hxx>
  24 #include <memory>
  25
  26 namespace sd
  27 {
  28 class SlideShow;
  29 }
  30 namespace sd
  31 {
  32 class ViewShellBase;
  33 }
  34 class SfxDispatcher;
  35 struct ImplSVEvent;
  36
  37 namespace sd
  38 {
  39 /** This class is used when a display is removed or added to restart the
  40     slide show.  This is necessary at least with DirectX because
  41     deactivating a display invalidates DirectX resources.  Accessing those
  42     leads to a crash.
  43
  44     During a restart a possibly installed presenter extension is given the
  45     opportunity to show or hide depending on the number of available displays.
  46 */
  47 class SlideShowRestarter : public std::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(::rtl::Reference<SlideShow> pSlideShow, ViewShellBase* pViewShellBase);
  59     virtual ~SlideShowRestarter();
  60
  61     /** Restarting the slide show is an asynchronous multi step process
  62         which is started by calling this method.
  63         @param bForce
  64            Used to force a re-start, even if the display count is unchanged.
  65     */
  66     void Restart(bool bForce);
  67
  68 private:
  69     ImplSVEvent* mnEventId;
  70     ::rtl::Reference<SlideShow> mpSlideShow;
  71     ViewShellBase* mpViewShellBase;
  72     ::std::shared_ptr<SlideShowRestarter> mpSelf;
  73     sal_Int32 mnDisplayCount;
  74     SfxDispatcher* mpDispatcher;
  75     sal_Int32 mnCurrentSlideNumber;
  76
  77     DECL_LINK(EndPresentation, void*, void);
  78
  79     /** Restart the presentation on the slide last shown before the restart
  80         was initiated.
  81     */
  82     void StartPresentation();
  83 };
  84
  85 } // end of namespace sd
  86
  87 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */