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diff --git a/slideshow/source/engine/rehearsetimingsactivity.hxx b/slideshow/source/engine/rehearsetimingsactivity.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_REHEARSETIMINGSACTIVITY_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_ENGINE_REHEARSETIMINGSACTIVITY_HXX
+
+#include <activity.hxx>
+#include <activitiesqueue.hxx>
+#include <eventqueue.hxx>
+#include <vieweventhandler.hxx>
+
+#include <basegfx/range/b2drange.hxx>
+#include <vcl/font.hxx>
+
+#include <vector>
+#include <utility>
+#include <memory>
+
+namespace vcl { class Font; }
+namespace canvas::tools{ class ElapsedTime; }
+namespace cppcanvas{ class CustomSprite; }
+namespace basegfx
+{
+    class B2IVector;
+    class B2DRange;
+}
+
+namespace slideshow::internal {
+
+struct SlideShowContext;
+class EventMultiplexer;
+class ScreenUpdater;
+class RehearseTimingsActivity : public Activity,
+                                public ViewEventHandler
+{
+public:
+    /** Creates the activity.
+     */
+    static std::shared_ptr<RehearseTimingsActivity> create(
+        const SlideShowContext& rContext );
+
+    virtual ~RehearseTimingsActivity() override;
+    RehearseTimingsActivity(const RehearseTimingsActivity&) = delete;
+    RehearseTimingsActivity& operator=(const RehearseTimingsActivity&) = delete;
+
+    /** Starts and shows the timer; adds to activity queue.
+     */
+    void start();
+
+    /** Stops and hides the timer.
+        @return elapsed time
+     */
+    double stop();
+
+    /** Determines whether the timer button has been clicked.
+     */
+    bool hasBeenClicked() const;
+
+    // ViewEventHandler interface
+    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;
+
+    // Disposable:
+    virtual void dispose() override;
+    // Activity:
+    virtual double calcTimeLag() const override;
+    virtual bool perform() override;
+    virtual bool isActive() const override;
+    virtual void dequeued() override;
+    virtual void end() override;
+
+private:
+    class WakeupEvent;
+
+    explicit RehearseTimingsActivity( const SlideShowContext& rContext );
+
+    void paint( ::cppcanvas::CanvasSharedPtr const & canvas ) const;
+    void paintAllSprites() const;
+
+    class MouseHandler;
+    friend class MouseHandler;
+
+    typedef std::vector<
+        std::pair<UnoViewSharedPtr,
+                    std::shared_ptr<cppcanvas::CustomSprite> > > ViewsVecT;
+
+    template <typename func_type>
+    void for_each_sprite( func_type const & func ) const
+    {
+        ViewsVecT::const_iterator iPos( maViews.begin() );
+        const ViewsVecT::const_iterator iEnd( maViews.end() );
+        for ( ; iPos != iEnd; ++iPos )
+            func( iPos->second );
+    }
+
+    ::basegfx::B2DRange calcSpriteRectangle(
+        UnoViewSharedPtr const & rView ) const;
+
+    EventQueue&                     mrEventQueue;
+    ScreenUpdater&                  mrScreenUpdater;
+    EventMultiplexer&               mrEventMultiplexer;
+    ActivitiesQueue&                mrActivitiesQueue;
+    canvas::tools::ElapsedTime      maElapsedTime;
+
+    ViewsVecT                       maViews;
+
+    /// screen rect of sprite (in view coordinates!)
+    ::basegfx::B2DRange             maSpriteRectangle;
+
+    vcl::Font                       maFont;
+    std::shared_ptr<WakeupEvent>  mpWakeUpEvent;
+    std::shared_ptr<MouseHandler> mpMouseHandler;
+    ::basegfx::B2IVector            maSpriteSizePixel;
+    sal_Int32                       mnYOffset;
+    bool                            mbActive;
+    bool                            mbDrawPressed;
+};
+
+} // namespace presentation::internal
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_ENGINE_REHEARSETIMINGSACTIVITY_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */