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- /*
- * $Id: ListItemLayoutManager.java,v 1.12 2003/03/07 07:58:52 jeremias Exp $
- * ============================================================================
- * The Apache Software License, Version 1.1
- * ============================================================================
- *
- * Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modifica-
- * tion, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- *
- * 3. The end-user documentation included with the redistribution, if any, must
- * include the following acknowledgment: "This product includes software
- * developed by the Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself, if
- * and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "FOP" and "Apache Software Foundation" must not be used to
- * endorse or promote products derived from this software without prior
- * written permission. For written permission, please contact
- * apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache", nor may
- * "Apache" appear in their name, without prior written permission of the
- * Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
- * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
- * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
- * DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- * ============================================================================
- *
- * This software consists of voluntary contributions made by many individuals
- * on behalf of the Apache Software Foundation and was originally created by
- * James Tauber <jtauber@jtauber.com>. For more information on the Apache
- * Software Foundation, please see <http://www.apache.org/>.
- */
- package org.apache.fop.layoutmgr.list;
-
- import org.apache.fop.fo.PropertyManager;
- import org.apache.fop.layoutmgr.BlockStackingLayoutManager;
- import org.apache.fop.layoutmgr.LayoutProcessor;
- 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 org.apache.fop.fo.properties.CommonBorderAndPadding;
- import org.apache.fop.fo.properties.CommonBackground;
-
- import java.util.Iterator;
- import java.util.ArrayList;
- import java.util.List;
-
- /**
- * LayoutManager for a list-item FO.
- * The list item contains a list item label and a list item body.
- */
- public class ListItemLayoutManager extends BlockStackingLayoutManager {
- private Item label;
- private Item body;
-
- private Block curBlockArea = null;
-
- private List cellList = null;
- private int listItemHeight;
- private CommonBorderAndPadding borderProps = null;
- private CommonBackground backgroundProps;
-
- private class ItemPosition extends LeafPosition {
- protected List cellBreaks;
- protected ItemPosition(LayoutProcessor lm, int pos, List l) {
- super(lm, pos);
- cellBreaks = l;
- }
- }
-
- /**
- * Create a new list item layout manager.
- *
- */
- public ListItemLayoutManager() {
- }
-
- /**
- * @see org.apache.fop.layoutmgr.AbstractLayoutManager#initProperties(PropertyManager)
- */
- protected void initProperties(PropertyManager propMgr) {
- borderProps = propMgr.getBorderAndPadding();
- backgroundProps = propMgr.getBackgroundProps();
- }
-
- /**
- * Sets the label of the list item
- * @param item the label item
- */
- public void setLabel(Item item) {
- label = item;
- label.setParent(this);
- }
-
- /**
- * Sets the body of the list item
- * @param item the body item
- */
- public void setBody(Item item) {
- body = item;
- body.setParent(this);
- }
-
- /**
- * Get the next break possibility.
- *
- * @param context the layout context for getting breaks
- * @return the next break possibility
- */
- public BreakPoss getNextBreakPoss(LayoutContext context) {
- // currently active LM
- Item curLM;
-
- label.setUserAgent(getUserAgent());
- body.setUserAgent(getUserAgent());
-
- BreakPoss lastPos = null;
- List breakList = new ArrayList();
-
- int min = 0;
- int opt = 0;
- int max = 0;
-
- int stage = 0;
- boolean over = false;
- while (true) {
- if (stage == 0) {
- curLM = label;
- } else if (stage == 1) {
- curLM = body;
- } else {
- break;
- }
- List childBreaks = new ArrayList();
- MinOptMax stackSize = new MinOptMax();
-
- // Set up a LayoutContext
- // the ipd is from the current column
- int ipd = context.getRefIPD();
- BreakPoss bp;
-
- LayoutContext childLC = new LayoutContext(0);
- childLC.setStackLimit(
- MinOptMax.subtract(context.getStackLimit(),
- stackSize));
- if (stage == 0) {
- childLC.setRefIPD(24000);
- } else if (stage == 1) {
- childLC.setRefIPD(context.getRefIPD() - 24000);
- }
- stage++;
- 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) {
- LayoutProcessor lm = lastPos.getLayoutManager();
- lm.resetPosition(lastPos.getPosition());
- if (lm != curLM) {
- curLM.resetPosition(null);
- }
- } else {
- curLM.resetPosition(null);
- }
- over = true;
- break;
- } else {
- lastPos = bp;
- }
- stackSize.add(bp.getStackingSize());
- childBreaks.add(bp);
-
- if (bp.nextBreakOverflows()) {
- over = true;
- break;
- }
-
- childLC.setStackLimit(MinOptMax.subtract(
- context.getStackLimit(), stackSize));
- }
- }
- // the min is the maximum min of the label and body
- if (stackSize.min > min) {
- min = stackSize.min;
- }
- // the optimum is the minimum of all optimums
- if (stackSize.opt > opt) {
- opt = stackSize.opt;
- }
- // the maximum is the largest maximum
- if (stackSize.max > max) {
- max = stackSize.max;
- }
-
- breakList.add(childBreaks);
- }
- listItemHeight = opt;
-
- MinOptMax itemSize = new MinOptMax(min, opt, max);
-
- if (label.isFinished() && body.isFinished()) {
- setFinished(true);
- }
-
- ItemPosition rp = new ItemPosition(this, breakList.size() - 1, breakList);
- BreakPoss breakPoss = new BreakPoss(rp);
- if (over) {
- breakPoss.setFlag(BreakPoss.NEXT_OVERFLOWS, true);
- }
- breakPoss.setStackingSize(itemSize);
- return breakPoss;
- }
-
- /**
- * Add the areas for the break points.
- * This sets the offset of each cell 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();
-
- Item childLM;
- LayoutContext lc = new LayoutContext(0);
- while (parentIter.hasNext()) {
- ItemPosition lfp = (ItemPosition) parentIter.next();
- // Add the block areas to Area
-
- for (Iterator iter = lfp.cellBreaks.iterator(); iter.hasNext();) {
- List cellsbr = (List)iter.next();
- PositionIterator breakPosIter;
- breakPosIter = new BreakPossPosIter(cellsbr, 0, cellsbr.size());
-
- while ((childLM = (Item)breakPosIter.getNextChildLM()) != null) {
- if (childLM == body) {
- childLM.setXOffset(24000);
- }
- childLM.addAreas(breakPosIter, lc);
- }
- }
- }
-
- curBlockArea.setHeight(listItemHeight);
-
- flush();
-
- curBlockArea = null;
- }
-
- /**
- * Get the height of the list item after adjusting.
- * Should only be called after adding the list item areas.
- *
- * @return the height of this list item after adjustment
- */
- public int getListItemHeight() {
- return listItemHeight;
- }
-
- /**
- * 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 for the child
- */
- public Area getParentArea(Area childArea) {
- if (curBlockArea == null) {
- curBlockArea = new Block();
-
- // Set up dimensions
- Area parentArea = parentLM.getParentArea(curBlockArea);
- int referenceIPD = parentArea.getIPD();
- curBlockArea.setIPD(referenceIPD);
- curBlockArea.setWidth(referenceIPD);
- // Get reference IPD from parentArea
- setCurrentArea(curBlockArea); // ??? for generic operations
- }
- return curBlockArea;
- }
-
- /**
- * Add the child.
- * Rows return the areas returned by the child elements.
- * This simply adds the area to the parent layout manager.
- *
- * @param childArea the child area
- */
- public void addChild(Area childArea) {
- if (curBlockArea != null) {
- curBlockArea.addBlock((Block) childArea);
- }
- }
-
- /**
- * 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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