1 /*************************************************************************
2  *
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * Copyright 2000, 2010 Oracle and/or its affiliates.
6  *
7  * OpenOffice.org - a multi-platform office productivity suite
8  *
9  * This file is part of OpenOffice.org.
10  *
11  * OpenOffice.org is free software: you can redistribute it and/or modify
12  * it under the terms of the GNU Lesser General Public License version 3
13  * only, as published by the Free Software Foundation.
14  *
15  * OpenOffice.org is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU Lesser General Public License version 3 for more details
19  * (a copy is included in the LICENSE file that accompanied this code).
20  *
21  * You should have received a copy of the GNU Lesser General Public License
22  * version 3 along with OpenOffice.org.  If not, see
23  * <http://www.openoffice.org/license.html>
24  * for a copy of the LGPLv3 License.
25  *
26  ************************************************************************/
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
92