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+/*************************************************************************
+ *
+ *  $RCSfile: pairanimation.hxx,v $
+ *
+ *  $Revision: 1.2 $
+ *
+ *  last change: $Author: rt $ $Date: 2004-11-26 19:18:44 $
+ *
+ *  The Contents of this file are made available subject to the terms of
+ *  either of the following licenses
+ *
+ *         - GNU Lesser General Public License Version 2.1
+ *         - Sun Industry Standards Source License Version 1.1
+ *
+ *  Sun Microsystems Inc., October, 2000
+ *
+ *  GNU Lesser General Public License Version 2.1
+ *  =============================================
+ *  Copyright 2000 by Sun Microsystems, Inc.
+ *  901 San Antonio Road, Palo Alto, CA 94303, USA
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License version 2.1, as published by the Free Software Foundation.
+ *
+ *  This library 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 for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ *  MA  02111-1307  USA
+ *
+ *
+ *  Sun Industry Standards Source License Version 1.1
+ *  =================================================
+ *  The contents of this file are subject to the Sun Industry Standards
+ *  Source License Version 1.1 (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.openoffice.org/license.html.
+ *
+ *  Software provided under this License is provided on an "AS IS" basis,
+ *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
+ *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
+ *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
+ *  See the License for the specific provisions governing your rights and
+ *  obligations concerning the Software.
+ *
+ *  The Initial Developer of the Original Code is: Sun Microsystems, Inc.
+ *
+ *  Copyright: 2000 by Sun Microsystems, Inc.
+ *
+ *  All Rights Reserved.
+ *
+ *  Contributor(s): _______________________________________
+ *
+ *
+ ************************************************************************/
+
+#ifndef _SLIDESHOW_PAIRANIMATION_HXX
+#define _SLIDESHOW_PAIRANIMATION_HXX
+
+#include <animation.hxx>
+
+#ifndef _BGFX_TUPLE_B2DTUPLE_HXX
+#include <basegfx/tuple/b2dtuple.hxx>
+#endif
+
+
+/* Definition of PairAnimation interface */
+
+namespace presentation
+{
+    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 /* _SLIDESHOW_PAIRANIMATION_HXX */