/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id: LabelEndFunction.java 495371 2007-01-11 21:03:07Z adelmelle $ */
package org.apache.fop.fo.expr;
import org.apache.fop.datatypes.Numeric;
import org.apache.fop.datatypes.Length;
import org.apache.fop.datatypes.LengthBase;
import org.apache.fop.fo.Constants;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.flow.ListItem;
import org.apache.fop.fo.properties.PercentLength;
import org.apache.fop.fo.properties.Property;
/**
* Class modelling the label-end Property Value function. See Sec. 5.10.4 of the
* XSL-FO spec.
*/
public class LabelEndFunction extends FunctionBase {
/**
* @return 0 (the number of arguments required for the label-end function)
*/
public int nbArgs() {
return 0;
}
/**
*
* @param args array of arguments for the function (none are needed, but
* required for the Function interface)
* @param pInfo PropertyInfo object for the function
* @return the calculated label-end value for the list
* @throws PropertyException if called from outside of an fo:list-item
*/
public Property eval(Property[] args,
PropertyInfo pInfo) throws PropertyException {
Length distance = pInfo.getPropertyList().get(
Constants.PR_PROVISIONAL_DISTANCE_BETWEEN_STARTS).getLength();
Length separation = pInfo.getPropertyList().getNearestSpecified(
Constants.PR_PROVISIONAL_LABEL_SEPARATION).getLength();
PropertyList pList = pInfo.getPropertyList();
while (pList != null && !(pList.getFObj() instanceof ListItem)) {
pList = pList.getParentPropertyList();
}
if (pList == null) {
throw new PropertyException("label-end() called from outside an fo:list-item");
}
Length startIndent = pList.get(Constants.PR_START_INDENT).getLength();
LengthBase base = new LengthBase(pInfo.getPropertyList(),
LengthBase.CONTAINING_REFAREA_WIDTH);
PercentLength refWidth = new PercentLength(1.0, base);
Numeric labelEnd = distance;
labelEnd = NumericOp.addition(labelEnd, startIndent);
//TODO add start-intrusion-adjustment
labelEnd = NumericOp.subtraction(labelEnd, separation);
labelEnd = NumericOp.subtraction(refWidth, labelEnd);
return (Property) labelEnd;
}
}