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/*
* $Id$
* Copyright (C) 2001 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.layoutmgr;
import org.apache.fop.apps.FOPException;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.properties.Constants;
import org.apache.fop.area.*;
/**
* LayoutManager for an fo:flow object.
* Its parent LM is the PageLayoutManager.
* This LM is responsible for getting columns of the appropriate size
* and filling them with block-level areas generated by its children.
*/
public class FlowLayoutManager extends BlockStackingLayoutManager {
/** Array of areas currently being filled stored by area class */
private BlockParent[] currentAreas = new BlockParent[Area.CLASS_MAX];
/**
* This is the top level layout manager.
* It is created by the PageSequence FO.
*/
public FlowLayoutManager(FObj fobj) {
super(fobj);
}
/**
* Add child area to a the correct container, depending on its
* area class. A Flow can fill at most one area container of any class
* at any one time. The actual work is done by BlockStackingLM.
*/
public void addChild(Area childArea) {
addChildToArea(childArea,
this.currentAreas[childArea.getAreaClass()]);
}
public Area getParentArea(Area childArea) {
// Get an area from the Page
BlockParent parentArea =
(BlockParent) parentLM.getParentArea(childArea);
this.currentAreas[parentArea.getAreaClass()] = parentArea;
setCurrentArea(parentArea);
return parentArea;
}
}
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