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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.table;
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;
/**
* LayoutManager for a table-cell FO.
* A cell contains blocks. These blocks fill the cell.
*/
public class Cell extends BlockStackingLayoutManager {
private BorderAndPadding borderProps = null;
private BackgroundProps backgroundProps;
private Block curBlockArea;
private ArrayList childBreaks = new ArrayList();
private int xoffset;
private int yoffset;
private int cellIPD;
/**
* Create a new Cell layout manager.
* @param fobj the formatting object for the cell
*/
public Cell(FObj fobj) {
super(fobj);
}
protected void initProperties(PropertyManager propMgr) {
borderProps = propMgr.getBorderAndPadding();
backgroundProps = propMgr.getBackgroundProps();
}
/**
* Get the next break possibility for this cell.
* A cell contains blocks so there are breaks around the blocks
* and inside the blocks.
*
* @param context the layout context
* @return the next break possibility
*/
public BreakPoss getNextBreakPoss(LayoutContext context) {
LayoutManager curLM; // currently active LM
MinOptMax stackSize = new MinOptMax();
// if starting add space before
// stackSize.add(spaceBefore);
BreakPoss lastPos = null;
cellIPD = context.getRefIPD();
while ((curLM = getChildLM()) != null) {
if(curLM.generatesInlineAreas()) {
// error
curLM.setFinished(true);
continue;
}
// 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.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 cell.
* This offset is used to set the absolute position of the cell.
*
* @param off the y direction offset
*/
public void setYOffset(int off) {
yoffset = off;
}
/**
* Set the x offset of this cell.
* This offset is used to set the absolute position of the cell.
*
* @param off the x offset
*/
public void setXOffset(int off) {
xoffset = off;
}
/**
* Add the areas for the break points.
* The cell contains block stacking layout managers
* that add block areas.
*
* @param parentIter the iterator of the break positions
* @param layoutContext the layout context for adding the areas
*/
public void addAreas(PositionIterator parentIter,
LayoutContext layoutContext) {
getParentArea(null);
addID();
LayoutManager 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(childBreaks, iStartPos,
lfp.getLeafPos() + 1);
iStartPos = lfp.getLeafPos() + 1;
while ((childLM = breakPosIter.getNextChildLM()) != null) {
childLM.addAreas(breakPosIter, lc);
}
}
if(borderProps != null) {
addBorders(curBlockArea, borderProps);
}
if(backgroundProps != null) {
addBackground(curBlockArea, backgroundProps);
}
flush();
childBreaks.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 to get the parent for
* @return the parent area
*/
public Area getParentArea(Area childArea) {
if (curBlockArea == null) {
curBlockArea = new Block();
curBlockArea.setPositioning(Block.ABSOLUTE);
// set position
curBlockArea.setXOffset(xoffset);
curBlockArea.setYOffset(yoffset);
curBlockArea.setWidth(cellIPD);
//curBlockArea.setHeight();
// Set up dimensions
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 to the cell block area.
*
* @param childArea the child to add to the cell
* @return unused
*/
public boolean addChild(Area childArea) {
if (curBlockArea != null) {
curBlockArea.addBlock((Block) childArea);
return false;
}
return false;
}
/**
* Reset the position of the layout.
*
* @param resetPos the position to reset to
*/
public void resetPosition(Position resetPos) {
if (resetPos == null) {
reset(null);
}
}
}
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