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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.properties;
import org.apache.fop.apps.FOPException;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.PropertyList;
/**
* A maker which calculates the line-height property.
* This property maker is special because line-height inherit the specified
* value, instead of the computed value.
* So when a line-height is create based on a attribute, the specified value
* is stored in the property and in compute() the stored specified value of
* the nearest specified is used to recalculate the line-height.
*/
public class LineHeightPropertyMaker extends LengthProperty.Maker {
/**
* Create a maker for line-height.
* @param propId the is for linehight.
*/
public LineHeightPropertyMaker(int propId) {
super(propId);
}
/**
* Make a property as normal, and save the specified value.
* @see PropertyMaker#make(PropertyList, String, FObj)
*/
public Property make(PropertyList propertyList, String value,
FObj fo) throws FOPException {
Property p = super.make(propertyList, value, fo);
p.setSpecifiedValue(checkValueKeywords(value));
return p;
}
/**
* Recalculate the line-height value based on the nearest specified
* value.
* @see PropertyMaker#compute(PropertyList)
*/
protected Property compute(PropertyList propertyList) throws FOPException {
// recalculate based on last specified value
// Climb up propertylist and find last spec'd value
Property specProp = propertyList.getNearestSpecified(propId);
if (specProp != null) {
String specVal = specProp.getSpecifiedValue();
if (specVal != null) {
try {
return make(propertyList, specVal,
propertyList.getParentFObj());
} catch (FOPException e) {
//getLogger()error("Error computing property value for "
// + propName + " from "
// + specVal);
return null;
}
}
}
return null;
}
protected Property convertPropertyDatatype(Property p,
PropertyList propertyList,
FObj fo) {
Number numval = p.getNumber();
if (numval != null) {
return new PercentLength(numval.doubleValue(), getPercentBase(fo,propertyList));
}
return super.convertPropertyDatatype(p, propertyList, fo);
}
}
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