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/*
* $Id: BlockStackingLayoutManager.java,v 1.18 2003/03/07 07:58:51 jeremias Exp $
* ============================================================================
* The Apache Software License, Version 1.1
* ============================================================================
*
* Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by the Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "FOP" and "Apache Software Foundation" must not be used to
* endorse or promote products derived from this software without prior
* written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache", nor may
* "Apache" appear in their name, without prior written permission of the
* Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
* DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ============================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of the Apache Software Foundation and was originally created by
* James Tauber <jtauber@jtauber.com>. For more information on the Apache
* Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.fop.layoutmgr;
import org.apache.fop.area.Area;
import org.apache.fop.area.BlockParent;
import org.apache.fop.area.Block;
import org.apache.fop.traits.*;
/**
* 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 LayoutProcessor curChildLM = null;
protected BlockParent parentArea = null;
public BlockStackingLayoutManager() {
}
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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