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27*cdf0e10cSrcweir 
28*cdf0e10cSrcweir #ifndef INCLUDED_SLIDESHOW_EXPRESSIONNODE_HXX
29*cdf0e10cSrcweir #define INCLUDED_SLIDESHOW_EXPRESSIONNODE_HXX
30*cdf0e10cSrcweir 
31*cdf0e10cSrcweir #include "animationfunction.hxx"
32*cdf0e10cSrcweir 
33*cdf0e10cSrcweir 
34*cdf0e10cSrcweir /* Definition of ExpressionNode interface */
35*cdf0e10cSrcweir 
36*cdf0e10cSrcweir namespace slideshow
37*cdf0e10cSrcweir {
38*cdf0e10cSrcweir     namespace internal
39*cdf0e10cSrcweir     {
40*cdf0e10cSrcweir         /** Refinement of AnimationFunction
41*cdf0e10cSrcweir 
42*cdf0e10cSrcweir 	        This interface is used by the SMIL function parser, to
43*cdf0e10cSrcweir 	        collapse constant values into precalculated, single nodes.
44*cdf0e10cSrcweir         */
45*cdf0e10cSrcweir         class ExpressionNode : public AnimationFunction
46*cdf0e10cSrcweir         {
47*cdf0e10cSrcweir         public:
48*cdf0e10cSrcweir             /** Predicate whether this node is constant.
49*cdf0e10cSrcweir 
50*cdf0e10cSrcweir         	    This predicate returns true, if this node is
51*cdf0e10cSrcweir                 neither time- nor ViewInfo dependent. This allows
52*cdf0e10cSrcweir                 for certain obtimizations, i.e. not the full
53*cdf0e10cSrcweir                 expression tree needs be represented by
54*cdf0e10cSrcweir                 ExpressionNodes.
55*cdf0e10cSrcweir 
56*cdf0e10cSrcweir                 @returns true, if this node is neither time- nor
57*cdf0e10cSrcweir                 ViewInfo dependent
58*cdf0e10cSrcweir             */
59*cdf0e10cSrcweir             virtual bool isConstant() const = 0;
60*cdf0e10cSrcweir         };
61*cdf0e10cSrcweir 
62*cdf0e10cSrcweir         typedef ::boost::shared_ptr< ExpressionNode > ExpressionNodeSharedPtr;
63*cdf0e10cSrcweir     }
64*cdf0e10cSrcweir }
65*cdf0e10cSrcweir 
66*cdf0e10cSrcweir #endif /* INCLUDED_SLIDESHOW_EXPRESSIONNODE_HXX */
67