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diff --git a/slideshow/source/engine/waitsymbol.hxx b/slideshow/source/engine/waitsymbol.hxx
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+++ b/slideshow/source/engine/waitsymbol.hxx
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+/* -*- 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 .
+ */
+
+#ifndef INCLUDED_SLIDESHOW_SOURCE_ENGINE_WAITSYMBOL_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_ENGINE_WAITSYMBOL_HXX
+
+#include <com/sun/star/rendering/XBitmap.hpp>
+#include <cppcanvas/sprite.hxx>
+
+#include <vieweventhandler.hxx>
+#include <screenupdater.hxx>
+#include <eventmultiplexer.hxx>
+#include <unoview.hxx>
+
+#include <memory>
+#include <vector>
+
+namespace slideshow {
+namespace internal {
+
+class EventMultiplexer;
+typedef std::shared_ptr<class WaitSymbol> WaitSymbolSharedPtr;
+
+/// On-screen 'hour glass' for when slideshow is unresponsive
+class WaitSymbol : public ViewEventHandler
+{
+public:
+    WaitSymbol(const WaitSymbol&) = delete;
+    WaitSymbol& operator=(const WaitSymbol&) = delete;
+
+    static WaitSymbolSharedPtr create( const css::uno::Reference<css::rendering::XBitmap>& xBitmap,
+                                       ScreenUpdater&                               rScreenUpdater,
+                                       EventMultiplexer&                            rEventMultiplexer,
+                                       const UnoViewContainer&                      rViewContainer );
+
+    /** Shows the wait symbol.
+     */
+    void show() { setVisible(true); }
+
+    /** Hides the wait symbol.
+     */
+    void hide() { setVisible(false); }
+
+private:
+    WaitSymbol( const css::uno::Reference<css::rendering::XBitmap>& xBitmap,
+                ScreenUpdater&                               rScreenUpdater,
+                const UnoViewContainer&                      rViewContainer );
+
+    // ViewEventHandler
+    virtual void viewAdded( const UnoViewSharedPtr& rView ) override;
+    virtual void viewRemoved( const UnoViewSharedPtr& rView ) override;
+    virtual void viewChanged( const UnoViewSharedPtr& rView ) override;
+    virtual void viewsChanged() override;
+
+    void setVisible( const bool bVisible );
+    ::basegfx::B2DPoint calcSpritePos( UnoViewSharedPtr const & rView ) const;
+
+    typedef ::std::vector<
+        ::std::pair<UnoViewSharedPtr,
+                    cppcanvas::CustomSpriteSharedPtr> > ViewsVecT;
+
+    css::uno::Reference<css::rendering::XBitmap>  mxBitmap;
+
+    ViewsVecT                                  maViews;
+    ScreenUpdater&                             mrScreenUpdater;
+    bool                                       mbVisible;
+};
+
+} // namespace internal
+} // namespace presentation
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */