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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_EXPRESSIONNODE_HXX
#define INCLUDED_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 /* INCLUDED_SLIDESHOW_EXPRESSIONNODE_HXX */
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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