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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed 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.
*/
/* $Id$ */
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.FONode;
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();
FONode item = pInfo.getFO();
while (item != null && !(item instanceof ListItem)) {
item = item.getParent();
}
if (item == null) {
throw new PropertyException("label-end() called from outside an fo:list-item");
}
Length startIndent = ((ListItem)item).propertyList.get(Constants.PR_START_INDENT).getLength();
// Should be CONTAINING_REFAREA but that doesn't work
LengthBase base = new LengthBase((ListItem)item, pInfo.getPropertyList(),
LengthBase.CONTAINING_BOX);
PercentLength refWidth = new PercentLength(1.0, base);
Numeric labelEnd = refWidth;
labelEnd = NumericOp.addition(labelEnd, NumericOp.negate(distance));
labelEnd = NumericOp.addition(labelEnd, NumericOp.negate(startIndent));
labelEnd = NumericOp.addition(labelEnd, separation);
return (Property) labelEnd;
}
}
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