/*
 * 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: RegionSE.java 1479969 2013-05-07 16:23:13Z vhennebert $ */

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 
fo:region-start and 
fo:region-end.
/**
 * 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 FONode. 
Params:
parent –  the FONode that is to be the parent/**
     * 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} /** {@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.
Params:
vpRefRect – viewport reference rectangle
wm – writing mode
siblingContext – the context to use to resolve extent on siblings/**
     * 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;
            }
        }
    }
}