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diff --git a/slideshow/source/inc/pairanimation.hxx b/slideshow/source/inc/pairanimation.hxx
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+/*************************************************************************
+ *
+ * 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_PAIRANIMATION_HXX
+#define INCLUDED_SLIDESHOW_PAIRANIMATION_HXX
+
+#include "animation.hxx"
+#include <basegfx/tuple/b2dtuple.hxx>
+
+
+/* Definition of PairAnimation interface */
+
+namespace slideshow
+{
+    namespace internal
+    {
+        /** Interface defining a pair of numbers animation.
+
+            This interface is a specialization of the Animation
+            interface, and is used to animate attributes representable
+            by a pair of floating point values (e.g. a position or a
+            size).
+         */
+        class PairAnimation : public Animation
+        {
+        public:
+            typedef ::basegfx::B2DTuple ValueType;
+
+            /** Set the animation to the given value
+
+                @param rValue
+                Current animation value.
+             */
+            virtual bool operator()( const ValueType& rValue ) = 0;
+
+            /** Request the underlying value for this animation.
+
+                This is necessary for pure To or By animations, as the
+                Activity cannot determine a sensible start value
+                otherwise.
+
+                @attention Note that you are only permitted to query
+                for the underlying value, if the animation has actually
+                been started (via start() call).
+             */
+            virtual ValueType getUnderlyingValue() const = 0;
+        };
+
+        typedef ::boost::shared_ptr< PairAnimation > PairAnimationSharedPtr;
+
+    }
+}
+
+#endif /* INCLUDED_SLIDESHOW_PAIRANIMATION_HXX */