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/*
* 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.
*/
/* $Id$ */
package org.apache.fop.fo.properties;
import org.apache.fop.datatypes.Length;
import org.apache.fop.datatypes.LengthBase;
import org.apache.fop.datatypes.Numeric;
import org.apache.fop.fo.Constants;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.expr.PropertyException;
/**
* A maker which calculates the line-height property.
* This property maker is special because line-height inherits the specified
* value, instead of the computed value.
* So when a line-height is create based on an 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 SpaceProperty.Maker {
/**
* Create a maker for line-height.
* @param propId the is for linehight.
*/
public LineHeightPropertyMaker(int propId) {
super(propId);
}
/**
* {@inheritDoc}
*/
public Property make(PropertyList propertyList, String value, FObj fo)
throws PropertyException {
/* if value was specified as a number/length/percentage then
* conditionality and precedence components are overridden
*/
Property p = super.make(propertyList, value, fo);
p.getSpace().setConditionality(
EnumProperty.getInstance(Constants.EN_RETAIN, "RETAIN"), true);
p.getSpace().setPrecedence(
EnumProperty.getInstance(Constants.EN_FORCE, "FORCE"), true);
return p;
}
/**
* Recalculate the line-height value based on the nearest specified
* value.
* {@inheritDoc}
*/
protected Property compute(PropertyList propertyList) throws PropertyException {
// 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) {
return make(propertyList, specVal,
propertyList.getParentFObj());
}
}
return null;
}
/**
* {@inheritDoc}
*/
public Property convertProperty(Property p,
PropertyList propertyList,
FObj fo) throws PropertyException {
Numeric numval = p.getNumeric();
if (numval != null && numval.getDimension() == 0) {
if (getPercentBase(propertyList) instanceof LengthBase) {
Length base = ((LengthBase)getPercentBase(propertyList)).getBaseLength();
if (base != null && base.isAbsolute()) {
p = FixedLength.getInstance(
numval.getNumericValue() * base.getNumericValue());
} else {
p = new PercentLength(
numval.getNumericValue(), getPercentBase(propertyList));
}
}
Property spaceProp = super.convertProperty(p, propertyList, fo);
spaceProp.setSpecifiedValue(String.valueOf(numval.getNumericValue()));
return spaceProp;
}
return super.convertProperty(p, propertyList, fo);
}
}
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