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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;
-
- import java.util.ListIterator;
- import java.util.ArrayList;
- import java.util.List;
-
- import org.apache.fop.datatypes.PercentBase;
- import org.apache.fop.fo.FObj;
- import org.apache.fop.fo.TextInfo;
- import org.apache.fop.fo.PropertyManager;
- import org.apache.fop.area.Area;
- import org.apache.fop.area.Block;
- import org.apache.fop.area.LineArea;
- import org.apache.fop.traits.LayoutProps;
- import org.apache.fop.fo.properties.CommonBorderAndPadding;
- import org.apache.fop.fo.properties.CommonBackground;
- import org.apache.fop.fo.properties.CommonMarginBlock;
- import org.apache.fop.traits.MinOptMax;
-
- /**
- * LayoutManager for a block FO.
- */
- public class BlockLayoutManager extends BlockStackingLayoutManager {
-
- private Block curBlockArea;
-
- private LayoutProps layoutProps;
- private CommonBorderAndPadding borderProps;
- private CommonBackground backgroundProps;
- private CommonMarginBlock marginProps;
-
- /* holds the (one-time use) fo:block space-before
- and -after properties. Large fo:blocks are split
- into multiple Area.Blocks to accomodate the subsequent
- regions (pages) they are placed on. space-before
- is applied at the beginning of the first
- Block and space-after at the end of the last Block
- used in rendering the fo:block.
- */
- private MinOptMax foBlockSpaceBefore = null;
- // need to retain foBlockSpaceAfter from previous instantiation
- private static MinOptMax foBlockSpaceAfter = null;
- private MinOptMax prevFoBlockSpaceAfter = null;
-
- private int lead = 12000;
- private int lineHeight = 14000;
- private int follow = 2000;
-
- private int iStartPos = 0;
-
- protected List childBreaks = new java.util.ArrayList();
-
- /**
- * Iterator for Block layout.
- * This iterator combines consecutive inline areas and
- * creates a line layout manager.
- * The use of this iterator means that it can be reset properly.
- */
- protected class BlockLMiter extends LMiter {
-
- private ListIterator proxy;
-
- public BlockLMiter(LayoutProcessor lp, ListIterator pr) {
- super(lp, null);
- proxy = pr;
- }
-
- protected boolean preLoadNext() {
- while (proxy.hasNext()) {
- LayoutProcessor lm = (LayoutProcessor) proxy.next();
- lm.setParent(BlockLayoutManager.this);
- if (lm.generatesInlineAreas()) {
- LineLayoutManager lineLM = createLineManager(lm);
- listLMs.add(lineLM);
- } else {
- listLMs.add(lm);
- }
- if (curPos < listLMs.size()) {
- return true;
- }
- }
- return false;
- }
-
- protected LineLayoutManager createLineManager(
- LayoutManager firstlm) {
- LayoutProcessor lm;
- List inlines = new ArrayList();
- inlines.add(firstlm);
- while (proxy.hasNext()) {
- lm = (LayoutProcessor) proxy.next();
- lm.setParent(BlockLayoutManager.this);
- if (lm.generatesInlineAreas()) {
- inlines.add(lm);
- } else {
- proxy.previous();
- break;
- }
- }
- LineLayoutManager child;
- child = new LineLayoutManager(lineHeight,
- lead, follow);
- child.setUserAgent(getUserAgent());
- child.setFObj(fobj);
- child.setLMiter(inlines.listIterator());
- return child;
-
- }
- }
-
- public BlockLayoutManager() {
- }
-
- /**
- * Set the FO object for this layout manager
- *
- * @param fo the fo for this layout manager
- */
- public void setFObj(FObj fo) {
- super.setFObj(fo);
- childLMiter = new BlockLMiter(this, childLMiter);
- }
-
- public void setBlockTextInfo(TextInfo ti) {
- lead = ti.fs.getAscender();
- follow = -ti.fs.getDescender();
- lineHeight = ti.lineHeight;
- }
-
- /**
- * This method provides a hook for a LayoutManager to intialize traits
- * for the areas it will create, based on Properties set on its FO.
- */
- protected void initProperties(PropertyManager pm) {
- layoutProps = pm.getLayoutProps();
- borderProps = pm.getBorderAndPadding();
- backgroundProps = pm.getBackgroundProps();
- marginProps = pm.getMarginProps();
- foBlockSpaceBefore = layoutProps.spaceBefore.getSpace();
- prevFoBlockSpaceAfter = foBlockSpaceAfter;
- }
-
- public BreakPoss getNextBreakPoss(LayoutContext context) {
- LayoutProcessor curLM; // currently active LM
-
- int ipd = context.getRefIPD();
- int iIndents = marginProps.startIndent + marginProps.endIndent;
- int bIndents = borderProps.getBPPaddingAndBorder(false);
- ipd -= iIndents;
-
- MinOptMax stackSize = new MinOptMax();
-
- if (prevFoBlockSpaceAfter != null) {
- stackSize.add(prevFoBlockSpaceAfter);
- prevFoBlockSpaceAfter = null;
- }
-
- if (foBlockSpaceBefore != null) {
- // this function called before addAreas(), so
- // resetting foBlockSpaceBefore = null in addAreas()
- stackSize.add(foBlockSpaceBefore);
- }
-
- BreakPoss lastPos = null;
-
- // Set context for percentage property values.
- fobj.setLayoutDimension(PercentBase.BLOCK_IPD, ipd);
- fobj.setLayoutDimension(PercentBase.BLOCK_BPD, -1);
-
- while ((curLM = getChildLM()) != null) {
- // Make break positions and return blocks!
- // Set up a LayoutContext
- 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
- if (curLM.generatesInlineAreas()) {
- // set stackLimit for lines
- childLC.setStackLimit(new MinOptMax(ipd/* - iIndents - iTextIndent*/));
- childLC.setRefIPD(ipd);
- } else {
- 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) {
- LayoutProcessor 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;
- }
-
- if (curLM.generatesInlineAreas()) {
- // Reset stackLimit for non-first lines
- childLC.setStackLimit(new MinOptMax(ipd/* - iIndents*/));
- } else {
- childLC.setStackLimit(MinOptMax.subtract(
- context.getStackLimit(), stackSize));
- }
- }
- }
- if (getChildLM() == null || over) {
- if (getChildLM() == null) {
- setFinished(true);
- stackSize.add(layoutProps.spaceAfter.getSpace());
- }
- 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);
- BreakPoss breakPoss = new BreakPoss(new LeafPosition(this, -2));
- breakPoss.setStackingSize(stackSize);
- return breakPoss;
- }
-
- public void addAreas(PositionIterator parentIter,
- LayoutContext layoutContext) {
- getParentArea(null);
-
- // if adjusted space before
- double adjust = layoutContext.getSpaceAdjust();
- addBlockSpacing(adjust, foBlockSpaceBefore);
- foBlockSpaceBefore = null;
-
- addID();
- addMarkers(true, true);
-
- LayoutProcessor childLM;
- LayoutContext lc = new LayoutContext(0);
- while (parentIter.hasNext()) {
- LeafPosition lfp = (LeafPosition) parentIter.next();
- if (lfp.getLeafPos() == -2) {
- curBlockArea = null;
- flush();
- return;
- }
- // 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);
- }
- }
-
- int bIndents = borderProps.getBPPaddingAndBorder(false);
- curBlockArea.setHeight(curBlockArea.getHeight() + bIndents);
-
- addMarkers(false, true);
-
- flush();
-
- // if adjusted space after
- foBlockSpaceAfter = layoutProps.spaceAfter.getSpace();
- addBlockSpacing(adjust, foBlockSpaceAfter);
-
- 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.
- */
- public Area getParentArea(Area childArea) {
- if (curBlockArea == null) {
- curBlockArea = new Block();
-
- // set traits
- TraitSetter.addBorders(curBlockArea, borderProps);
- TraitSetter.addBackground(curBlockArea, backgroundProps);
- TraitSetter.addMargins(curBlockArea, borderProps, marginProps);
-
- // Set up dimensions
- // Must get dimensions from parent area
- 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;
- }
-
- public void addChild(Area childArea) {
- if (curBlockArea != null) {
- if (childArea instanceof LineArea) {
- curBlockArea.addLineArea((LineArea) childArea);
- } else {
- curBlockArea.addBlock((Block) childArea);
- }
- }
- }
-
- public void resetPosition(Position resetPos) {
- if (resetPos == null) {
- reset(null);
- childBreaks.clear();
- iStartPos = 0;
- } else {
- //reset(resetPos);
- LayoutManager lm = resetPos.getLM();
- }
- }
- }
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