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/*
* Copyright 2005 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.layoutmgr;
import org.apache.fop.datatypes.PercentBaseContext;
import org.apache.fop.fo.Constants;
import org.apache.fop.fo.properties.LengthRangeProperty;
import org.apache.fop.traits.MinOptMax;
/**
* Utilities for MinOptMax and LengthRangeProperty.
*/
public class MinOptMaxUtil {
/**
* Restricts a MinOptMax using the values from a LengthRangeProperty.
* @param mom MinOptMax to restrict
* @param lr restricting source
* @param context Percentage evaluation context
*/
public static void restrict(MinOptMax mom, LengthRangeProperty lr,
PercentBaseContext context) {
if (lr.getEnum() != Constants.EN_AUTO) {
if (lr.getMinimum(context).getEnum() != Constants.EN_AUTO) {
int min = lr.getMinimum(context).getLength().getValue(context);
if (min > mom.min) {
mom.min = min;
fixAfterMinChanged(mom);
}
}
if (lr.getMaximum(context).getEnum() != Constants.EN_AUTO) {
int max = lr.getMaximum(context).getLength().getValue(context);
if (max < mom.max) {
mom.max = max;
if (mom.max < mom.opt) {
mom.opt = mom.max;
mom.min = mom.opt;
}
}
}
if (lr.getOptimum(context).getEnum() != Constants.EN_AUTO) {
int opt = lr.getOptimum(context).getLength().getValue(context);
if (opt > mom.min) {
mom.opt = opt;
if (mom.opt > mom.max) {
mom.max = mom.opt;
}
}
}
}
}
/**
* Extend the minimum length to the given length.
* @param mom the min/opt/max trait
* @param len the new minimum length
* @param optToLen if set adjusts the optimum length to be the smaller of the
* minimum length and the given length
*/
public static void extendMinimum(MinOptMax mom, int len, boolean optToLen) {
if (mom.min < len) {
mom.min = len;
mom.opt = Math.max(mom.min, mom.opt);
if (optToLen) {
mom.opt = Math.min(mom.min, len);
}
mom.max = Math.max(mom.opt, mom.max);
}
}
/**
* After a calculation on a MinOptMax, this can be called to set opt to
* a new effective value.
* @param mom MinOptMax to adjust
*/
public static void fixAfterMinChanged(MinOptMax mom) {
if (mom.min > mom.opt) {
mom.opt = mom.min;
if (mom.opt > mom.max) {
mom.max = mom.opt;
}
}
}
/**
* Converts a LengthRangeProperty to a MinOptMax.
* @param prop LengthRangeProperty
* @param context Percentage evaluation context
* @return the requested MinOptMax instance
*/
public static MinOptMax toMinOptMax(LengthRangeProperty prop, PercentBaseContext context) {
MinOptMax mom = new MinOptMax(
(prop.getMinimum(context).isAuto()
? 0 : prop.getMinimum(context).getLength().getValue(context)),
(prop.getOptimum(context).isAuto()
? 0 : prop.getOptimum(context).getLength().getValue(context)),
(prop.getMinimum(context).isAuto()
? Integer.MAX_VALUE
: prop.getMaximum(context).getLength().getValue(context)));
return mom;
}
}
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