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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: expressionnode.hxx,v $
*
* $Revision: 1.4 $
*
* last change: $Author: kz $ $Date: 2006-12-13 15:56:54 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 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
*
************************************************************************/
#ifndef _SLIDESHOW_EXPRESSIONNODE_HXX
#define _SLIDESHOW_EXPRESSIONNODE_HXX
#include <animationfunction.hxx>
/* Definition of ExpressionNode interface */
namespace slideshow
{
namespace internal
{
/** Refinement of AnimationFunction
This interface is used by the SMIL function parser, to
collapse constant values into precalculated, single nodes.
*/
class ExpressionNode : public AnimationFunction
{
public:
/** Predicate whether this node is constant.
This predicate returns true, if this node is
neither time- nor ViewInfo dependent. This allows
for certain obtimizations, i.e. not the full
expression tree needs be represented by
ExpressionNodes.
@returns true, if this node is neither time- nor
ViewInfo dependent
*/
virtual bool isConstant() const = 0;
};
typedef ::boost::shared_ptr< ExpressionNode > ExpressionNodeSharedPtr;
}
}
#endif /* _SLIDESHOW_EXPRESSIONNODE_HXX */
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