/*
 * $Id$
 * Copyright (C) 2002 The Apache Software Foundation. All rights reserved.
 * For details on use and redistribution please refer to the
 * LICENSE file included with these sources.
 */

package org.apache.fop.traits;

import org.apache.fop.datatypes.Length;
import org.apache.fop.fo.properties.Constants;

/**
 * Store properties affecting layout: break-before, break-after, keeps, span.
 * for a block level FO.
 * Public "structure" allows direct member access.
 */
public class LayoutProps {
    public int breakBefore; // enum constant BreakBefore.xxx
    public int breakAfter; // enum constant BreakAfter.xxx
    public boolean bIsSpan;
    public SpaceVal spaceBefore;
    public SpaceVal spaceAfter;

    private static final int[] s_breakPriorities =
        new int[]{ Constants.AUTO, Constants.COLUMN, Constants.PAGE };


    public LayoutProps() {
        breakBefore = breakAfter = Constants.AUTO;
        bIsSpan = false;
    }

    //     public static int higherBreak(int brkParent, int brkChild) {
    // if (brkParent == brkChild) return brkChild;
    // for (int i=0; i < s_breakPriorities.length; i++) {
    //     int bp = s_breakPriorities[i];
    //     if (bp == brkParent) return brkChild;
    //     else if (bp == brkChild) return brkParent;
    // }
    // return brkChild;
    //     }

    public void combineWithParent(LayoutProps parentLP) {
        if (parentLP.breakBefore != breakBefore) {
            for (int i = 0; i < s_breakPriorities.length; i++) {
                int bp = s_breakPriorities[i];
                if (bp == breakBefore) {
                    breakBefore = parentLP.breakBefore;
                    break;
                } else if (bp == parentLP.breakBefore) {
                    break;
                }
            }
        }
        // Parent span always overrides child span
        bIsSpan = parentLP.bIsSpan;
    }
}