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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.list;
import org.apache.fop.fo.PropertyManager;
import org.apache.fop.layoutmgr.BlockStackingLayoutManager;
import org.apache.fop.layoutmgr.LayoutManager;
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 org.apache.fop.layout.BorderAndPadding;
import org.apache.fop.layout.BackgroundProps;
import java.util.ArrayList;
import java.util.List;
/**
* LayoutManager for a table FO.
* A table consists of columns, table header, table footer and multiple
* table bodies.
* The header, footer and body add the areas created from the table cells.
* The table then creates areas for the columns, bodies and rows
* the render background.
*/
public class ListBlockLayoutManager extends BlockStackingLayoutManager {
private List columns = null;
private BorderAndPadding borderProps = null;
private BackgroundProps backgroundProps;
private Block curBlockArea;
private ArrayList bodyBreaks = new ArrayList();
private class SectionPosition extends LeafPosition {
protected List list;
protected SectionPosition(LayoutManager lm, int pos, List l) {
super(lm, pos);
list = l;
}
}
/**
* Create a new table layout manager.
*
* @param fobj the table formatting object
*/
public ListBlockLayoutManager(FObj fobj) {
super(fobj);
}
protected void initProperties(PropertyManager propMgr) {
borderProps = propMgr.getBorderAndPadding();
backgroundProps = propMgr.getBackgroundProps();
}
/**
* Get the next break possibility.
* The break possibility depends on the height of the header and footer
* and possible breaks inside the table body.
*
* @param context the layout context for finding breaks
* @return the next break possibility
*/
public BreakPoss getNextBreakPoss(LayoutContext context) {
ListItemLayoutManager curLM; // currently active LM
MinOptMax stackSize = new MinOptMax();
// if starting add space before
// stackSize.add(spaceBefore);
BreakPoss lastPos = null;
while ((curLM = (ListItemLayoutManager)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);
while (!curLM.isFinished()) {
if ((bp = curLM.getNextBreakPoss(childLC)) != null) {
stackSize.add(bp.getStackingSize());
if (stackSize.opt > context.getStackLimit().max) {
// reset to last break
if (lastPos != null) {
reset(lastPos.getPosition());
} else {
curLM.resetPosition(null);
}
break;
}
lastPos = bp;
bodyBreaks.add(bp);
childLC.setStackLimit(MinOptMax.subtract(
context.getStackLimit(), stackSize));
}
}
BreakPoss breakPoss = new BreakPoss(
new LeafPosition(this, bodyBreaks.size() - 1));
breakPoss.setStackingSize(stackSize);
return breakPoss;
}
setFinished(true);
return null;
}
/**
* The table area is a reference area that contains areas for
* columns, bodies, rows and the contents are in cells.
*
* @param parentIter the position iterator
* @param layoutContext the layout context for adding areas
*/
public void addAreas(PositionIterator parentIter,
LayoutContext layoutContext) {
getParentArea(null);
addID();
// add column, body then row areas
// add table header areas
int tableHeight = 0;
ListItemLayoutManager childLM;
int iStartPos = 0;
LayoutContext lc = new LayoutContext(0);
while (parentIter.hasNext()) {
LeafPosition lfp = (LeafPosition) parentIter.next();
// Add the block areas to Area
PositionIterator breakPosIter =
new BreakPossPosIter(bodyBreaks, iStartPos,
lfp.getLeafPos() + 1);
iStartPos = lfp.getLeafPos() + 1;
while ((childLM = (ListItemLayoutManager)breakPosIter.getNextChildLM()) != null) {
childLM.addAreas(breakPosIter, lc);
tableHeight += childLM.getListItemHeight();
}
}
// add footer areas
curBlockArea.setHeight(tableHeight);
if(borderProps != null) {
addBorders(curBlockArea, borderProps);
}
if(backgroundProps != null) {
addBackground(curBlockArea, backgroundProps);
}
flush();
bodyBreaks.clear();
curBlockArea = null;
}
/**
* 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 area of the child
*/
public Area getParentArea(Area childArea) {
if (curBlockArea == null) {
curBlockArea = new Block();
// Set up dimensions
// Must get dimensions from parent area
Area parentArea = parentLM.getParentArea(curBlockArea);
int referenceIPD = parentArea.getIPD();
curBlockArea.setIPD(referenceIPD);
// Get reference IPD from parentArea
setCurrentArea(curBlockArea); // ??? for generic operations
}
return curBlockArea;
}
/**
* Add the child area to this layout manager.
*
* @param childArea the child area to add
* @return unused
*/
public boolean addChild(Area childArea) {
if (curBlockArea != null) {
curBlockArea.addBlock((Block) childArea);
return false;
}
return false;
}
/**
* Reset the position of this layout manager.
*
* @param resetPos the position to reset to
*/
public void resetPosition(Position resetPos) {
if (resetPos == null) {
reset(null);
}
}
}
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