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diff --git a/slideshow/source/engine/activities/activitybase.hxx b/slideshow/source/engine/activities/activitybase.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef INCLUDED_SLIDESHOW_ACTIVITYBASE_HXX
+#define INCLUDED_SLIDESHOW_ACTIVITYBASE_HXX
+
+#include "animationactivity.hxx"
+#include "activityparameters.hxx"
+#include "animatableshape.hxx"
+#include "shapeattributelayer.hxx"
+
+namespace slideshow {
+namespace internal {
+
+/** Base class for animation activities.
+
+    This whole class hierarchy is only for code sharing
+    between the various specializations (with or without
+    key times, fully discrete, etc.).
+*/
+class ActivityBase : public AnimationActivity
+{
+public:
+    ActivityBase( const ActivityParameters& rParms );
+
+    /// From Disposable interface
+    virtual void dispose();
+
+protected:
+    /** From Activity interface
+
+        Derived classes should override, call this first
+        and then perform their work.
+    */
+    virtual bool perform();
+    virtual double calcTimeLag() const;
+    virtual bool isActive() const;
+
+private:
+    virtual void dequeued();
+
+    // From AnimationActivity interface
+    virtual void setTargets(
+        const AnimatableShapeSharedPtr&        rShape,
+        const ShapeAttributeLayerSharedPtr&    rAttrLayer );
+
+private:
+    /** Hook for derived classes
+
+        This method will be called from the first
+        perform() invocation, to signal the start of the
+        activity.
+    */
+    virtual void startAnimation() = 0;
+
+    /** Hook for derived classes
+
+        This method will be called after the last perform()
+        invocation, and after the potential changes of that
+        perform() call are committed to screen. That is, in
+        endAnimation(), the animation objects (sprites,
+        animation) can safely be destroyed, without causing
+        visible artifacts on screen.
+    */
+    virtual void endAnimation() = 0;
+
+protected:
+
+    /** End this activity, in a regular way.
+
+        This method is for derived classes needing to signal a
+        regular activity end (i.e. because the regular
+        duration is over)
+    */
+    void endActivity();
+
+    /** Modify fractional time.
+
+        This method modifies the fractional time (total
+        duration mapped to the [0,1] range) to the
+        effective simple time, but only according to
+        acceleration/deceleration.
+    */
+    double calcAcceleratedTime( double nT ) const;
+
+    bool isDisposed() const {
+        return (!mbIsActive && !mpEndEvent && !mpShape &&
+                !mpAttributeLayer);
+    }
+
+    EventQueue& getEventQueue() const { return mrEventQueue; }
+
+    AnimatableShapeSharedPtr getShape() const { return mpShape; }
+
+    ShapeAttributeLayerSharedPtr getShapeAttributeLayer() const
+        { return mpAttributeLayer; }
+
+    bool isRepeatCountValid() const { return maRepeats; }
+    double getRepeatCount() const { return *maRepeats; }
+    bool isAutoReverse() const { return mbAutoReverse; }
+
+private:
+    /// Activity:
+    virtual void end();
+    virtual void performEnd() = 0;
+
+private:
+    EventSharedPtr                  mpEndEvent;
+    EventQueue&                     mrEventQueue;
+    AnimatableShapeSharedPtr        mpShape; // only to pass on to animation
+    ShapeAttributeLayerSharedPtr    mpAttributeLayer; // only to pass on to anim
+
+    ::boost::optional<double> const maRepeats;
+    const double                    mnAccelerationFraction;
+    const double                    mnDecelerationFraction;
+
+    const bool                      mbAutoReverse;
+
+    // true, if perform() has not yet been called:
+    mutable bool                    mbFirstPerformCall;
+    bool                            mbIsActive;
+};
+
+} // namespace internal
+} // namespace presentation
+
+#endif /* INCLUDED_SLIDESHOW_ACTIVITYBASE_HXX */
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */