1*b1cdbd2cSJim Jagielski /************************************************************** 2*b1cdbd2cSJim Jagielski * 3*b1cdbd2cSJim Jagielski * Licensed to the Apache Software Foundation (ASF) under one 4*b1cdbd2cSJim Jagielski * or more contributor license agreements. See the NOTICE file 5*b1cdbd2cSJim Jagielski * distributed with this work for additional information 6*b1cdbd2cSJim Jagielski * regarding copyright ownership. The ASF licenses this file 7*b1cdbd2cSJim Jagielski * to you under the Apache License, Version 2.0 (the 8*b1cdbd2cSJim Jagielski * "License"); you may not use this file except in compliance 9*b1cdbd2cSJim Jagielski * with the License. You may obtain a copy of the License at 10*b1cdbd2cSJim Jagielski * 11*b1cdbd2cSJim Jagielski * http://www.apache.org/licenses/LICENSE-2.0 12*b1cdbd2cSJim Jagielski * 13*b1cdbd2cSJim Jagielski * Unless required by applicable law or agreed to in writing, 14*b1cdbd2cSJim Jagielski * software distributed under the License is distributed on an 15*b1cdbd2cSJim Jagielski * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16*b1cdbd2cSJim Jagielski * KIND, either express or implied. See the License for the 17*b1cdbd2cSJim Jagielski * specific language governing permissions and limitations 18*b1cdbd2cSJim Jagielski * under the License. 19*b1cdbd2cSJim Jagielski * 20*b1cdbd2cSJim Jagielski *************************************************************/ 21*b1cdbd2cSJim Jagielski 22*b1cdbd2cSJim Jagielski 23*b1cdbd2cSJim Jagielski 24*b1cdbd2cSJim Jagielski #ifndef INCLUDED_SLIDESHOW_EXPRESSIONNODE_HXX 25*b1cdbd2cSJim Jagielski #define INCLUDED_SLIDESHOW_EXPRESSIONNODE_HXX 26*b1cdbd2cSJim Jagielski 27*b1cdbd2cSJim Jagielski #include "animationfunction.hxx" 28*b1cdbd2cSJim Jagielski 29*b1cdbd2cSJim Jagielski 30*b1cdbd2cSJim Jagielski /* Definition of ExpressionNode interface */ 31*b1cdbd2cSJim Jagielski 32*b1cdbd2cSJim Jagielski namespace slideshow 33*b1cdbd2cSJim Jagielski { 34*b1cdbd2cSJim Jagielski namespace internal 35*b1cdbd2cSJim Jagielski { 36*b1cdbd2cSJim Jagielski /** Refinement of AnimationFunction 37*b1cdbd2cSJim Jagielski 38*b1cdbd2cSJim Jagielski This interface is used by the SMIL function parser, to 39*b1cdbd2cSJim Jagielski collapse constant values into precalculated, single nodes. 40*b1cdbd2cSJim Jagielski */ 41*b1cdbd2cSJim Jagielski class ExpressionNode : public AnimationFunction 42*b1cdbd2cSJim Jagielski { 43*b1cdbd2cSJim Jagielski public: 44*b1cdbd2cSJim Jagielski /** Predicate whether this node is constant. 45*b1cdbd2cSJim Jagielski 46*b1cdbd2cSJim Jagielski This predicate returns true, if this node is 47*b1cdbd2cSJim Jagielski neither time- nor ViewInfo dependent. This allows 48*b1cdbd2cSJim Jagielski for certain obtimizations, i.e. not the full 49*b1cdbd2cSJim Jagielski expression tree needs be represented by 50*b1cdbd2cSJim Jagielski ExpressionNodes. 51*b1cdbd2cSJim Jagielski 52*b1cdbd2cSJim Jagielski @returns true, if this node is neither time- nor 53*b1cdbd2cSJim Jagielski ViewInfo dependent 54*b1cdbd2cSJim Jagielski */ 55*b1cdbd2cSJim Jagielski virtual bool isConstant() const = 0; 56*b1cdbd2cSJim Jagielski }; 57*b1cdbd2cSJim Jagielski 58*b1cdbd2cSJim Jagielski typedef ::boost::shared_ptr< ExpressionNode > ExpressionNodeSharedPtr; 59*b1cdbd2cSJim Jagielski } 60*b1cdbd2cSJim Jagielski } 61*b1cdbd2cSJim Jagielski 62*b1cdbd2cSJim Jagielski #endif /* INCLUDED_SLIDESHOW_EXPRESSIONNODE_HXX */ 63