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/*
* $Id$
* Copyright (C) 2001-2002 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.FOUserAgent;
import org.apache.fop.area.Area;
import org.apache.fop.area.MinOptMax;
import org.apache.fop.area.Resolveable;
import org.apache.fop.area.PageViewport;
import org.apache.avalon.framework.logger.Logger;
import java.util.List;
import java.util.ArrayList;
/**
* Content Layout Manager.
* For use with objects that contain inline areas such as
* leader use-content and title.
*/
public class ContentLayoutManager implements LayoutManager {
private FOUserAgent userAgent;
private Area holder;
private int stackSize;
private LayoutManager parentLM;
/**
* Constructs a new ContentLayoutManager
*
* @param area The parent area
*/
public ContentLayoutManager(Area area) {
holder = area;
}
public void fillArea(LayoutManager curLM) {
List childBreaks = new ArrayList();
MinOptMax stack = new MinOptMax();
int ipd = 1000000;
BreakPoss bp;
LayoutContext childLC = new LayoutContext(LayoutContext.NEW_AREA);
childLC.setLeadingSpace(new SpaceSpecifier(false));
childLC.setTrailingSpace(new SpaceSpecifier(false));
// set stackLimit for lines
childLC.setStackLimit(new MinOptMax(ipd));
childLC.setRefIPD(ipd);
int lineHeight = 14000;
int lead = 12000;
int follow = 2000;
int halfLeading = (lineHeight - lead - follow) / 2;
// height before baseline
int lineLead = lead + halfLeading;
// maximum size of top and bottom alignment
int maxtb = follow + halfLeading;
// max size of middle alignment below baseline
int middlefollow = maxtb;
while (!curLM.isFinished()) {
MinOptMax lastSize = null;
if ((bp = curLM.getNextBreakPoss(childLC)) != null) {
lastSize = bp.getStackingSize();
childBreaks.add(bp);
if (bp.getLead() > lineLead) {
lineLead = bp.getLead();
}
if (bp.getTotal() > maxtb) {
maxtb = bp.getTotal();
}
if (bp.getMiddle() > middlefollow) {
middlefollow = bp.getMiddle();
}
}
if(lastSize != null) {
stack.add(lastSize);
}
}
if (maxtb - lineLead > middlefollow) {
middlefollow = maxtb - lineLead;
}
//if(holder instanceof InlineParent) {
// ((InlineParent)holder).setHeight(lineHeight);
//}
LayoutContext lc = new LayoutContext(0);
lc.setBaseline(lineLead);
lc.setLineHeight(lineHeight);
lc.setFlags(LayoutContext.RESOLVE_LEADING_SPACE, true);
lc.setLeadingSpace(new SpaceSpecifier(false));
lc.setTrailingSpace(new SpaceSpecifier(false));
PositionIterator breakPosIter =
new BreakPossPosIter(childBreaks, 0, childBreaks.size());
curLM.addAreas(breakPosIter, lc);
stackSize = stack.opt;
}
public int getStackingSize() {
return stackSize;
}
/** @see org.apache.fop.layoutmgr.LayoutManager */
public boolean generatesInlineAreas() {
return true;
}
/** @see org.apache.fop.layoutmgr.LayoutManager */
public Area getParentArea(Area childArea) {
return holder;
}
/** @see org.apache.fop.layoutmgr.LayoutManager */
public void addChild(Area childArea) {
holder.addChild(childArea);
}
/**
* Set the user agent.
*
* @param ua the user agent
*/
public void setUserAgent(FOUserAgent ua) {
userAgent = ua;
}
public FOUserAgent getUserAgent() {
return userAgent;
}
protected Logger getLogger() {
return userAgent.getLogger();
}
/** @see org.apache.fop.layoutmgr.LayoutManager */
public void setParentLM(LayoutManager lm) {
parentLM = lm;
}
/** @see org.apache.fop.layoutmgr.LayoutManager */
public boolean canBreakBefore(LayoutContext lc) {
return false;
}
/** @see org.apache.fop.layoutmgr.LayoutManager */
public BreakPoss getNextBreakPoss(LayoutContext context) {
return null;
}
/** @see org.apache.fop.layoutmgr.LayoutManager */
public boolean isFinished() {
return false;
}
/** @see org.apache.fop.layoutmgr.LayoutManager */
public void setFinished(boolean isFinished) {
//to be done
}
/** @see org.apache.fop.layoutmgr.LayoutManager */
public void addAreas(PositionIterator posIter, LayoutContext context) { }
/** @see org.apache.fop.layoutmgr.LayoutManager */
public void init() {
//to be done
}
/** @see org.apache.fop.layoutmgr.LayoutManager */
public void resetPosition(Position position) {
//to be done
}
/** @see org.apache.fop.layoutmgr.LayoutManager */
public void getWordChars(StringBuffer sbChars, Position bp1,
Position bp2) { }
/** @see org.apache.fop.layoutmgr.LayoutManager */
public String getCurrentPageNumber() {
return parentLM.getCurrentPageNumber();
}
/** @see org.apache.fop.layoutmgr.LayoutManager */
public PageViewport resolveRefID(String ref) {
return parentLM.resolveRefID(ref);
}
/** @see org.apache.fop.layoutmgr.LayoutManager */
public void addIDToPage(String id) {
parentLM.addIDToPage(id);
}
/** @see org.apache.fop.layoutmgr.LayoutManager */
public void addUnresolvedArea(String id, Resolveable res) {
parentLM.addUnresolvedArea(id, res);
}
/** @see org.apache.fop.layoutmgr.LayoutManager */
public void addMarker(String name, LayoutManager lm, boolean start) {
parentLM.addMarker(name, lm, start);
}
/** @see org.apache.fop.layoutmgr.LayoutManager */
public LayoutManager retrieveMarker(String name, int pos, int boundary) {
return parentLM.retrieveMarker(name, pos, boundary);
}
}
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