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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-start">
* <code>fo:region-start</code></a> and <a href="http://www.w3.org/TR/xsl/#fo_region-end">
* <code>fo:region-end</code></a>.
*/
public abstract class RegionSE extends SideRegion {
// The value of properties relevant for fo:region-[start|end].
// End of property values
/**
* Create a RegionSE instance that is a child of the
* given parent {@link FONode}.
* @param parent the {@link FONode} that is to be the parent
*/
protected RegionSE(FONode parent) {
super(parent);
}
/** {@inheritDoc} */
public void bind(PropertyList pList) throws FOPException {
super.bind(pList);
}
/**
* Adjust the viewport reference rectangle for a region as a function
* of precedence.
* If before and after have precedence = true, the start and end
* regions only go to the limits of their extents, otherwise
* they extend in the BPD to the page reference rectangle
* diminish by extend of start and end if 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;
RegionBefore before = (RegionBefore) getSiblingRegion(FO_REGION_BEFORE);
if (before != null && before.getPrecedence() == EN_TRUE) {
offset = before.getExtent().getValue(siblingContext);
vpRefRect.translate(0, offset);
}
RegionAfter after = (RegionAfter) getSiblingRegion(FO_REGION_AFTER);
if (after != null && after.getPrecedence() == EN_TRUE) {
offset += after.getExtent().getValue(siblingContext);
}
// [TBD] WRITING MODE ALERT
if (offset > 0) {
if (wm == WritingMode.LR_TB || wm == WritingMode.RL_TB) {
vpRefRect.height -= offset;
} else {
vpRefRect.width -= offset;
}
}
}
}
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