1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 21 22 #include "precompiled_sd.hxx" 23 24 #include "slideshow.hxx" 25 #include "ViewShellBase.hxx" 26 #include <rtl/ref.hxx> 27 #include <tools/link.hxx> 28 #include <boost/enable_shared_from_this.hpp> 29 30 namespace sd { 31 32 /** This class is used when a display is removed or added to restart the 33 slide show. This is necessary at least with DirectX because 34 deactivating a display invalidates DirectX resources. Accessing those 35 leads to a crash. 36 37 During a restart a possibly installed presenter extension is given the 38 opportunity to show or hide depending on the number of available displays. 39 */ 40 class SlideShowRestarter 41 : public boost::enable_shared_from_this<SlideShowRestarter> 42 { 43 public: 44 /** Create a new SlideShowRestarter object. 45 @param rpSlideShow 46 The slide show is used to determine the current slide, which is 47 restored after the restart, and of course to stop and start the 48 slide show. 49 @param pViewShellBase 50 Used to get access to a slot dispatcher. 51 */ 52 SlideShowRestarter ( 53 const ::rtl::Reference<SlideShow>& rpSlideShow, 54 ViewShellBase* pViewShellBase); 55 virtual ~SlideShowRestarter (void); 56 57 /** Restarting the slide show is an asynchronous multi step process 58 which is started by calling this method. 59 */ 60 void Restart (void); 61 62 private: 63 sal_Int32 mnEventId; 64 ::rtl::Reference<SlideShow> mpSlideShow; 65 ViewShellBase* mpViewShellBase; 66 ::boost::shared_ptr<SlideShowRestarter> mpSelf; 67 sal_Int32 mnDisplayCount; 68 SfxDispatcher* mpDispatcher; 69 sal_Int32 mnCurrentSlideNumber; 70 71 /** The display count is used to determine whether the number of 72 displays has changed and thus whether restarting the slide show is 73 really necessary. 74 */ 75 sal_Int32 GetDisplayCount (void); 76 77 DECL_LINK(EndPresentation, void*); 78 79 /** Restart the presentation on the slide last shown before the restart 80 was initiated. 81 */ 82 void StartPresentation (void); 83 }; 84 85 } // end of namespace sd 86 87 /* vim: set noet sw=4 ts=4: */ 88