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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.layoutmgr.table;
import org.apache.fop.fo.flow.TableCaption;
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.area.Area;
import org.apache.fop.area.Block;
import org.apache.fop.traits.MinOptMax;
import java.util.ArrayList;
import java.util.List;
/**
* LayoutManager for a table-caption FO.
* The table caption contains blocks that are placed beside the
* table.
*/
public class Caption extends BlockStackingLayoutManager {
private TableCaption fobj;
private Block curBlockArea;
private List childBreaks = new ArrayList();
/**
* Create a new Caption layout manager.
*
*/
public Caption(TableCaption node) {
super(node);
fobj = node;
}
/**
* Get the next break position for the caption.
*
* @param context the layout context for finding breaks
* @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;
// if there is a caption then get the side and work out when
// to handle it
while ((curLM = getChildLM()) != null) {
// Make break positions and return blocks!
// Set up a LayoutContext
int ipd = context.getRefIPD();
BreakPoss bp;
LayoutContext childLC = new LayoutContext(0);
// if line layout manager then set stack limit to ipd
// line LM actually generates a LineArea which is a block
childLC.setStackLimit(
MinOptMax.subtract(context.getStackLimit(),
stackSize));
childLC.setRefIPD(ipd);
boolean over = false;
while (!curLM.isFinished()) {
if ((bp = curLM.getNextBreakPoss(childLC)) != null) {
if (stackSize.opt + bp.getStackingSize().opt > context.getStackLimit().max) {
// reset to last break
if (lastPos != null) {
LayoutManager lm = lastPos.getLayoutManager();
lm.resetPosition(lastPos.getPosition());
if (lm != curLM) {
curLM.resetPosition(null);
}
} else {
curLM.resetPosition(null);
}
over = true;
break;
}
stackSize.add(bp.getStackingSize());
lastPos = bp;
childBreaks.add(bp);
if (bp.nextBreakOverflows()) {
over = true;
break;
}
childLC.setStackLimit(MinOptMax.subtract(
context.getStackLimit(), stackSize));
}
}
BreakPoss breakPoss = new BreakPoss(
new LeafPosition(this, childBreaks.size() - 1));
if (over) {
breakPoss.setFlag(BreakPoss.NEXT_OVERFLOWS, true);
}
breakPoss.setStackingSize(stackSize);
return breakPoss;
}
setFinished(true);
return null;
}
/**
* Add the areas to the parent.
*
* @param parentIter the position iterator of the breaks
* @param layoutContext the layout context for adding areas
*/
public void addAreas(PositionIterator parentIter,
LayoutContext layoutContext) {
getParentArea(null);
addID(fobj.getId());
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);
}
}
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
* @return the parent area from this caption
*/
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 to the caption area.
*
* @param childArea the child area to add
*/
public void addChild(Area childArea) {
if (curBlockArea != null) {
curBlockArea.addBlock((Block) childArea);
}
}
/**
* Reset the layout position.
*
* @param resetPos the position to reset to
*/
public void resetPosition(Position resetPos) {
if (resetPos == null) {
reset(null);
}
}
}
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