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/*
* $Id$
* 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.layoutmgr;
import org.apache.fop.fo.FObj;
import org.apache.fop.area.Area;
import org.apache.fop.area.BlockParent;
import org.apache.fop.area.Block;
import java.util.Iterator;
/**
* Base LayoutManager class for all areas which stack their child
* areas in the block-progression direction, such as Flow, Block, ListBlock.
*/
public abstract class BlockStackingLayoutManager extends AbstractLayoutManager {
/**
* Reference to FO whose areas it's managing or to the traits
* of the FO.
*/
protected LayoutManager curChildLM = null;
protected BlockParent parentArea = null;
public BlockStackingLayoutManager(FObj fobj) {
super(fobj);
}
private BreakCost evaluateBreakCost(Area parent, Area child) {
return new BreakCost(child, 0);
}
/** return current area being filled
*/
protected BlockParent getCurrentArea() {
return this.parentArea;
}
/**
* Set the current area being filled.
*/
protected void setCurrentArea(BlockParent parentArea) {
this.parentArea = parentArea;
}
protected MinOptMax resolveSpaceSpecifier(Area nextArea) {
SpaceSpecifier spaceSpec = new SpaceSpecifier(false);
// Area prevArea = getCurrentArea().getLast();
// if (prevArea != null) {
// spaceSpec.addSpace(prevArea.getSpaceAfter());
// }
// spaceSpec.addSpace(nextArea.getSpaceBefore());
return spaceSpec.resolve(false);
}
/**
* Add a block spacer for space before and space after a block.
* This adds an empty Block area that acts as a block space.
*
* @param adjust the adjustment value
* @param minoptmax the min/opt/max value of the spacing
*/
public void addBlockSpacing(double adjust, MinOptMax minoptmax) {
int sp = minoptmax.opt;
if(adjust > 0) {
sp = sp + (int)(adjust * (minoptmax.max - minoptmax.opt));
} else {
sp = sp + (int)(adjust * (minoptmax.opt - minoptmax.min));
}
if(sp != 0) {
Block spacer = new Block();
spacer.setHeight(sp);
parentLM.addChild(spacer);
}
}
/**
* Add the childArea to the passed area.
* Called by child LayoutManager when it has filled one of its areas.
* The LM should already have an Area in which to put the child.
* See if the area will fit in the current area.
* If so, add it. Otherwise initiate breaking.
* @param childArea the area to add: will be some block-stacked Area.
* @param parentArea the area in which to add the childArea
*/
protected void addChildToArea(Area childArea,
BlockParent parentArea) {
// This should be a block-level Area (Block in the generic sense)
if (!(childArea instanceof Block)) {
//log.error("Child not a Block in BlockStackingLM!");
}
MinOptMax spaceBefore = resolveSpaceSpecifier(childArea);
parentArea.addBlock((Block) childArea);
flush(); // hand off current area to parent
}
/**
* Add the childArea to the current area.
* Called by child LayoutManager when it has filled one of its areas.
* The LM should already have an Area in which to put the child.
* See if the area will fit in the current area.
* If so, add it. Otherwise initiate breaking.
* @param childArea the area to add: will be some block-stacked Area.
*/
public void addChild(Area childArea) {
addChildToArea(childArea, getCurrentArea());
}
/**
* Force current area to be added to parent area.
*/
protected void flush() {
if (getCurrentArea() != null) {
parentLM.addChild(getCurrentArea());
}
}
}
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