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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.pagination;
// Java
import java.awt.Rectangle;
import org.apache.fop.apps.FOPException;
import org.apache.fop.datatypes.PercentBaseContext;
import org.apache.fop.fo.FONode;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.traits.WritingMode;
/**
* Abstract base class for <a href="http://www.w3.org/TR/xsl/#fo_region-before">
* <code>fo:region-before</code></a> and <a href="http://www.w3.org/TR/xsl/#fo_region-after">
* <code>fo:region-after</code></a>.
*/
public abstract class RegionBA extends SideRegion {
// The value of properties relevant for fo:region-[before|after].
private int precedence;
// End of property values
/**
* Create a RegionBA instance that is a child of the
* given parent {@link FONode}.
* @param parent the {@link FONode} that is to be the parent
*/
protected RegionBA(FONode parent) {
super(parent);
}
/** {@inheritDoc} */
public void bind(PropertyList pList) throws FOPException {
super.bind(pList);
precedence = pList.get(PR_PRECEDENCE).getEnum();
}
/**
* Get the value of the <code>precedence</code> property.
* @return the "precedence" property
*/
public int getPrecedence() {
return precedence;
}
/**
* Adjust the viewport reference rectangle for a region as a function
* of precedence.
* If precedence is false on a before or after region, its
* inline-progression-dimension is limited by the extent of the start
* and end regions if they are present.
* @param vpRefRect viewport reference rectangle
* @param wm writing mode
* @param siblingContext the context to use to resolve extent on siblings
*/
protected void adjustIPD
( Rectangle vpRefRect, WritingMode wm, PercentBaseContext siblingContext ) {
int offset = 0;
RegionStart start = (RegionStart) getSiblingRegion(FO_REGION_START);
if (start != null) {
offset = start.getExtent().getValue(siblingContext);
vpRefRect.translate(offset, 0); // move (x, y) units
}
RegionEnd end = (RegionEnd) getSiblingRegion(FO_REGION_END);
if (end != null) {
offset += end.getExtent().getValue(siblingContext);
}
// [TBD] WRITING MODE ALERT
if (offset > 0) {
if (wm == WritingMode.LR_TB || wm == WritingMode.RL_TB) {
vpRefRect.width -= offset;
} else {
vpRefRect.height -= offset;
}
}
}
}
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