1 files changed, 87 insertions, 0 deletions
diff --git a/sd/source/ui/slideshow/SlideShowRestarter.hxx b/sd/source/ui/slideshow/SlideShowRestarter.hxx
new file mode 100644
index 0000000000..f8cf95c33a
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+++ b/sd/source/ui/slideshow/SlideShowRestarter.hxx
@@ -0,0 +1,87 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <rtl/ref.hxx>
+#include <tools/link.hxx>
+#include <memory>
+
+namespace sd
+{
+class SlideShow;
+}
+namespace sd
+{
+class ViewShellBase;
+}
+class SfxDispatcher;
+struct ImplSVEvent;
+
+namespace sd
+{
+/** This class is used when a display is removed or added to restart the
+    slide show.  This is necessary at least with DirectX because
+    deactivating a display invalidates DirectX resources.  Accessing those
+    leads to a crash.
+
+    During a restart a possibly installed presenter extension is given the
+    opportunity to show or hide depending on the number of available displays.
+*/
+class SlideShowRestarter : public std::enable_shared_from_this<SlideShowRestarter>
+{
+public:
+    /** Create a new SlideShowRestarter object.
+        @param rpSlideShow
+            The slide show is used to determine the current slide, which is
+            restored after the restart, and of course to stop and start the
+            slide show.
+        @param pViewShellBase
+            Used to get access to a slot dispatcher.
+    */
+    SlideShowRestarter(::rtl::Reference<SlideShow> pSlideShow, ViewShellBase* pViewShellBase);
+    virtual ~SlideShowRestarter();
+
+    /** Restarting the slide show is an asynchronous multi step process
+        which is started by calling this method.
+        @param bForce
+           Used to force a re-start, even if the display count is unchanged.
+    */
+    void Restart(bool bForce);
+
+private:
+    ImplSVEvent* mnEventId;
+    ::rtl::Reference<SlideShow> mpSlideShow;
+    ViewShellBase* mpViewShellBase;
+    ::std::shared_ptr<SlideShowRestarter> mpSelf;
+    sal_Int32 mnDisplayCount;
+    SfxDispatcher* mpDispatcher;
+    sal_Int32 mnCurrentSlideNumber;
+
+    DECL_LINK(EndPresentation, void*, void);
+
+    /** Restart the presentation on the slide last shown before the restart
+        was initiated.
+    */
+    void StartPresentation();
+};
+
+} // end of namespace sd
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */