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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.table;
import org.apache.fop.layoutmgr.BlockStackingLayoutManager;
import org.apache.fop.layoutmgr.LeafPosition;
import org.apache.fop.layoutmgr.BreakPoss;
import org.apache.fop.layoutmgr.LayoutContext;
import org.apache.fop.layoutmgr.PositionIterator;
import org.apache.fop.layoutmgr.BreakPossPosIter;
import org.apache.fop.layoutmgr.Position;
import org.apache.fop.fo.FObj;
import org.apache.fop.area.Area;
import org.apache.fop.area.Block;
import org.apache.fop.area.MinOptMax;
import java.util.ArrayList;
import java.util.List;
/**
* LayoutManager for a table-header, table-footer and table body FO.
* These fo objects have either rows or cells underneath.
* Cells are organised into rows.
*/
public class Body extends BlockStackingLayoutManager {
private boolean rows = true;
private List columns;
private int yoffset;
private int bodyHeight;
private Block curBlockArea;
private ArrayList childBreaks = new ArrayList();
/**
* Create a new body layout manager.
*
* @param fobj the formatting object that created this manager
*/
public Body(FObj fobj) {
super(fobj);
}
/**
* Set the columns from the table.
*
* @param cols the list of columns used for this body
*/
public void setColumns(List cols) {
columns = cols;
}
/**
* Breaks for this layout manager are of the form of before
* or after a row and inside a row.
*
* @param context the layout context for finding the breaks
* @return the next break possibility
*/
public BreakPoss getNextBreakPoss(LayoutContext context) {
Row curLM; // currently active LM
MinOptMax stackSize = new MinOptMax();
BreakPoss lastPos = null;
while ((curLM = (Row)getChildLM()) != null) {
// Make break positions
// Set up a LayoutContext
int ipd = context.getRefIPD();
BreakPoss bp;
LayoutContext childLC = new LayoutContext(0);
childLC.setStackLimit(
MinOptMax.subtract(context.getStackLimit(),
stackSize));
childLC.setRefIPD(ipd);
curLM.setColumns(columns);
while (!curLM.isFinished()) {
if ((bp = curLM.getNextBreakPoss(childLC)) != null) {
stackSize.add(bp.getStackingSize());
if (stackSize.min > context.getStackLimit().max) {
// reset to last break
if (lastPos != null) {
reset(lastPos.getPosition());
} else {
curLM.resetPosition(null);
}
break;
}
lastPos = bp;
childBreaks.add(bp);
childLC.setStackLimit(MinOptMax.subtract(
context.getStackLimit(), stackSize));
}
}
BreakPoss breakPoss = new BreakPoss(
new LeafPosition(this, childBreaks.size() - 1));
breakPoss.setStackingSize(stackSize);
return breakPoss;
}
setFinished(true);
return null;
}
/**
* Set the y offset of this body within the table.
* This is used to set the row offsets.
*
* @param off the y offset position
*/
public void setYOffset(int off) {
yoffset = off;
}
/**
* Add the areas for the break points.
* This sets the offset of each row as it is added.
*
* @param parentIter the position iterator
* @param layoutContext the layout context for adding areas
*/
public void addAreas(PositionIterator parentIter,
LayoutContext layoutContext) {
getParentArea(null);
addID();
Row childLM;
int iStartPos = 0;
LayoutContext lc = new LayoutContext(0);
int rowoffset = 0;
while (parentIter.hasNext()) {
LeafPosition lfp = (LeafPosition) parentIter.next();
// Add the block areas to Area
PositionIterator breakPosIter =
new BreakPossPosIter(childBreaks, iStartPos,
lfp.getLeafPos() + 1);
iStartPos = lfp.getLeafPos() + 1;
while ((childLM = (Row)breakPosIter.getNextChildLM()) != null) {
childLM.setYOffset(yoffset + rowoffset);
childLM.addAreas(breakPosIter, lc);
rowoffset += childLM.getRowHeight();
}
}
bodyHeight = rowoffset;
flush();
childBreaks.clear();
curBlockArea = null;
}
/**
* Get the body height of the body after adjusting.
* Should only be called after adding the body areas.
*
* @return the body height of this body
*/
public int getBodyHeight() {
return bodyHeight;
}
/**
* Return an Area which can contain the passed childArea. The childArea
* may not yet have any content, but it has essential traits set.
* In general, if the LayoutManager already has an Area it simply returns
* it. Otherwise, it makes a new Area of the appropriate class.
* It gets a parent area for its area by calling its parent LM.
* Finally, based on the dimensions of the parent area, it initializes
* its own area. This includes setting the content IPD and the maximum
* BPD.
*
* @param childArea the child area
* @return the parent are of the child
*/
public Area getParentArea(Area childArea) {
return parentLM.getParentArea(childArea);
}
/**
* Add the child area.
* The table-header, table-footer and table-body areas return
* the areas return by the children.
*
* @param childArea the child area to add
* @return unused
*/
public boolean addChild(Area childArea) {
return parentLM.addChild(childArea);
}
/**
* Reset the position of the layout manager.
*
* @param resetPos the position to reset to
*/
public void resetPosition(Position resetPos) {
if (resetPos == null) {
reset(null);
}
}
}
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