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- /*
- * $Id$
- * Copyright (C) 2001 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.fo.flow;
-
- // FOP
- import org.apache.fop.fo.*;
- import org.apache.fop.fo.properties.*;
- import org.apache.fop.layout.*;
- import org.apache.fop.datatypes.*;
- import org.apache.fop.apps.FOPException;
- import org.apache.fop.layoutmgr.LayoutManager;
- import org.apache.fop.layoutmgr.BlockLayoutManager;
- import org.apache.fop.util.CharUtilities;
- import org.apache.fop.apps.StreamRenderer;
-
- import org.xml.sax.Attributes;
-
- import java.util.List;
-
- /*
- Modified by Mark Lillywhite mark-fop@inomial.com. The changes
- here are based on memory profiling and do not change functionality.
- Essentially, the Block object had a pointer to a BlockArea object
- that it created. The BlockArea was not referenced after the Block
- was finished except to determine the size of the BlockArea, however
- a reference to the BlockArea was maintained and this caused a lot of
- GC problems, and was a major reason for FOP memory leaks. So,
- the reference to BlockArea was made local, the required information
- is now stored (instead of a reference to the complex BlockArea object)
- and it appears that there are a lot of changes in this file, in fact
- there are only a few sematic changes; mostly I just got rid of
- "this." from blockArea since BlockArea is now local.
- */
-
- public class Block extends FObjMixed {
-
- int align;
- int alignLast;
- int breakAfter;
- int lineHeight;
- int startIndent;
- int endIndent;
- int spaceBefore;
- int spaceAfter;
- int textIndent;
- int keepWithNext;
- ColorType backgroundColor;
- int blockWidows;
- int blockOrphans;
-
- int areaHeight = 0;
- int contentWidth = 0;
-
- String id;
- int span;
- private int wsTreatment; //ENUMERATION
- private int lfTreatment; //ENUMERATION
- private boolean bWScollapse; //true if white-space-collapse=true
-
- // this may be helpful on other FOs too
- boolean anythingLaidOut = false;
-
- /**
- * Index of first inline-type FO seen in a sequence.
- * Used during FO tree building to do white-space handling.
- */
- private FONode firstInlineChild = null;
-
- public Block(FONode parent) {
- super(parent);
- }
-
- public void handleAttrs(Attributes attlist) throws FOPException {
- super.handleAttrs(attlist);
- this.span = this.properties.get("span").getEnum();
- this.wsTreatment =
- this.properties.get("white-space-treatment").getEnum();
- this.bWScollapse =
- (this.properties.get("white-space-collapse").getEnum()
- == Constants.TRUE);
- this.lfTreatment =
- this.properties.get("linefeed-treatment").getEnum();
- }
-
- public Status layout(Area area) throws FOPException {
- BlockArea blockArea;
-
- // log.error(" b:LAY[" + marker + "] ");
-
-
- if (this.marker == BREAK_AFTER) {
- return new Status(Status.OK);
- }
-
- if (this.marker == START) {
-
- // Common Accessibility Properties
- AccessibilityProps mAccProps = propMgr.getAccessibilityProps();
-
- // Common Aural Properties
- AuralProps mAurProps = propMgr.getAuralProps();
-
- // Common Border, Padding, and Background Properties
- BorderAndPadding bap = propMgr.getBorderAndPadding();
- BackgroundProps bProps = propMgr.getBackgroundProps();
-
- // Common Font Properties
- //this.fontState = propMgr.getFontState(area.getFontInfo());
-
- // Common Hyphenation Properties
- HyphenationProps mHyphProps = propMgr.getHyphenationProps();
-
- // Common Margin Properties-Block
- MarginProps mProps = propMgr.getMarginProps();
-
- // Common Relative Position Properties
- RelativePositionProps mRelProps =
- propMgr.getRelativePositionProps();
-
- // this.properties.get("break-after");
- // this.properties.get("break-before");
- // this.properties.get("color");
- // this.properties.get("text-depth");
- // this.properties.get("text-altitude");
- // this.properties.get("hyphenation-keep");
- // this.properties.get("hyphenation-ladder-count");
- // this.properties.get("id");
- // this.properties.get("keep-together");
- // this.properties.get("keep-with-next");
- // this.properties.get("keep-with-previous");
- // this.properties.get("last-line-end-indent");
- // this.properties.get("linefeed-treatment");
- // this.properties.get("line-height");
- // this.properties.get("line-height-shift-adjustment");
- // this.properties.get("line-stacking-strategy");
- // this.properties.get("orphans");
- // this.properties.get("white-space-treatment");
- // this.properties.get("span");
- // this.properties.get("text-align");
- // this.properties.get("text-align-last");
- // this.properties.get("text-indent");
- // this.properties.get("visibility");
- // this.properties.get("white-space-collapse");
- // this.properties.get("widows");
- // this.properties.get("wrap-option");
- // this.properties.get("z-index");
-
- this.align = this.properties.get("text-align").getEnum();
- this.alignLast =
- this.properties.get("text-align-last").getEnum();
- this.breakAfter = this.properties.get("break-after").getEnum();
- this.lineHeight = this.properties.get(
- "line-height").getLength().mvalue();
- this.startIndent = this.properties.get(
- "start-indent").getLength().mvalue();
- this.endIndent = this.properties.get(
- "end-indent").getLength().mvalue();
- this.spaceBefore = this.properties.get(
- "space-before.optimum").getLength().mvalue();
- this.spaceAfter = this.properties.get(
- "space-after.optimum").getLength().mvalue();
- this.textIndent = this.properties.get(
- "text-indent").getLength().mvalue();
- this.keepWithNext =
- this.properties.get("keep-with-next").getEnum();
- this.backgroundColor = this.properties.get(
- "background-color").getColorType();
-
- this.blockWidows =
- this.properties.get("widows").getNumber().intValue();
- this.blockOrphans =
- this.properties.get("orphans").getNumber().intValue();
-
- this.id = this.properties.get("id").getString();
-
- if (area instanceof BlockArea) {
- area.end();
- }
-
- if (area.getIDReferences() != null)
- area.getIDReferences().createID(id);
-
- this.marker = 0;
-
- // no break if first in area tree, or leading in context
- // area
- int breakBeforeStatus = propMgr.checkBreakBefore(area);
- if (breakBeforeStatus != Status.OK) {
- return new Status(breakBeforeStatus);
- }
-
- int numChildren = this.children.size();
- for (int i = 0; i < numChildren; i++) {
- FONode fo = (FONode) children.get(i);
- if (fo instanceof FOText) {
- if (((FOText) fo).willCreateArea()) {
- //fo.setWidows(blockWidows);
- break;
- } else {
- children.remove(i);
- numChildren = this.children.size();
- i--;
- }
- } else {
- //fo.setWidows(blockWidows);
- break;
- }
- }
-
- for (int i = numChildren - 1; i >= 0; i--) {
- FONode fo = (FONode) children.get(i);
- if (fo instanceof FOText) {
- if (((FOText) fo).willCreateArea()) {
- //fo.setOrphans(blockOrphans);
- break;
- }
- } else {
- //fo.setOrphans(blockOrphans);
- break;
- }
- }
- }
-
- if ((spaceBefore != 0) && (this.marker == 0)) {
- area.addDisplaySpace(spaceBefore);
- }
-
- if (anythingLaidOut) {
- this.textIndent = 0;
- }
-
- if (marker == 0 && area.getIDReferences() != null) {
- area.getIDReferences().configureID(id, area);
- }
-
- int spaceLeft = area.spaceLeft();
- blockArea = new BlockArea( propMgr.getFontState(area.getFontInfo()),
- area.getAllocationWidth(), area.spaceLeft(),
- startIndent, endIndent, textIndent, align, alignLast,
- lineHeight);
- blockArea.setGeneratedBy(this);
- this.areasGenerated++;
- if (this.areasGenerated == 1)
- blockArea.isFirst(true);
- // for normal areas this should be the only pair
- blockArea.addLineagePair(this, this.areasGenerated);
-
- // markers
- //if (this.hasMarkers())
- //blockArea.addMarkers(this.getMarkers());
-
- blockArea.setParent(area); // BasicLink needs it
- blockArea.setPage(area.getPage());
- blockArea.setBackgroundColor(backgroundColor);
- blockArea.setBorderAndPadding(propMgr.getBorderAndPadding());
- blockArea.setHyphenation(propMgr.getHyphenationProps());
- blockArea.start();
-
- blockArea.setAbsoluteHeight(area.getAbsoluteHeight());
- blockArea.setIDReferences(area.getIDReferences());
-
- blockArea.setTableCellXOffset(area.getTableCellXOffset());
-
- int numChildren = this.children.size();
- for (int i = this.marker; i < numChildren; i++) {
- FONode fo = (FONode) children.get(i);
- Status status;
- if ((status = fo.layout(blockArea)).isIncomplete()) {
- this.marker = i;
- // this block was modified by
- // Hani Elabed 11/27/2000
- // if ((i != 0) && (status.getCode() == Status.AREA_FULL_NONE))
- // {
- // status = new Status(Status.AREA_FULL_SOME);
- // }
-
- // new block to replace the one above
- // Hani Elabed 11/27/2000
- if (status.getCode() == Status.AREA_FULL_NONE) {
- // something has already been laid out
- if ((i != 0)) {
- status = new Status(Status.AREA_FULL_SOME);
- area.addChild(blockArea);
- area.setMaxHeight(area.getMaxHeight() -
- spaceLeft + blockArea.getMaxHeight());
- area.increaseHeight(blockArea.getHeight());
- area.setAbsoluteHeight(
- blockArea.getAbsoluteHeight());
- anythingLaidOut = true;
-
- return status;
- } else // i == 0 nothing was laid out..
- {
- anythingLaidOut = false;
- return status;
- }
- }
-
- // blockArea.end();
- area.addChild(blockArea);
- area.setMaxHeight(area.getMaxHeight() - spaceLeft +
- blockArea.getMaxHeight());
- area.increaseHeight(blockArea.getHeight());
- area.setAbsoluteHeight(blockArea.getAbsoluteHeight());
- anythingLaidOut = true;
- return status;
- }
- anythingLaidOut = true;
- }
-
- blockArea.end();
-
- area.setMaxHeight(area.getMaxHeight() - spaceLeft +
- blockArea.getMaxHeight());
-
- area.addChild(blockArea);
-
- /* should this be combined into above? */
- area.increaseHeight(blockArea.getHeight());
-
- area.setAbsoluteHeight(blockArea.getAbsoluteHeight());
-
- if (spaceAfter != 0) {
- area.addDisplaySpace(spaceAfter);
- }
-
- if (area instanceof BlockArea) {
- area.start();
- }
- // This is not needed any more and it consumes a LOT
- // of memory. So we release it for the GC.
- areaHeight = blockArea.getHeight();
- contentWidth = blockArea.getContentWidth();
-
- // no break if last in area tree, or trailing in context
- // area
- int breakAfterStatus = propMgr.checkBreakAfter(area);
- if (breakAfterStatus != Status.OK) {
- this.marker = BREAK_AFTER;
- blockArea = null; //Faster GC - BlockArea is big
- return new Status(breakAfterStatus);
- }
-
- if (keepWithNext != 0) {
- blockArea = null; // Faster GC - BlockArea is big
- return new Status(Status.KEEP_WITH_NEXT);
- }
-
- // log.error(" b:OK" + marker + " ");
- blockArea.isLast(true);
- blockArea = null; // Faster GC - BlockArea is big
- return new Status(Status.OK);
- }
-
- public int getAreaHeight() {
- return areaHeight;
- }
-
-
- /**
- * Return the content width of the boxes generated by this FO.
- */
- public int getContentWidth() {
- return contentWidth; // getAllocationWidth()??
- }
-
-
- public int getSpan() {
- return this.span;
- }
-
- public void addLayoutManager(List list) {
- BlockLayoutManager blm = new BlockLayoutManager(this);
- TextInfo ti = propMgr.getTextLayoutProps(fontInfo);
- blm.setBlockTextInfo(ti);
- list.add(blm);
- }
-
- public boolean generatesInlineAreas() {
- return false;
- }
-
- public void addChild(FONode child) {
- // Handle whitespace based on values of properties
- // Handle a sequence of inline-producing children in
- // one pass
- if (((FObj) child).generatesInlineAreas()) {
- if (firstInlineChild == null) {
- firstInlineChild = child;
- }
- // lastInlineChild = children.size();
- } else {
- // Handle whitespace in preceeding inline areas if any
- handleWhiteSpace();
- }
- super.addChild(child);
- }
-
- public void end() {
- handleWhiteSpace();
- }
-
- private void handleWhiteSpace() {
- log.debug("fo:block: handleWhiteSpace");
- if (firstInlineChild != null) {
- boolean bInWS = false;
- boolean bPrevWasLF = false;
- RecursiveCharIterator charIter =
- new RecursiveCharIterator(this, firstInlineChild);
- LFchecker lfCheck = new LFchecker(charIter);
-
- while (charIter.hasNext()) {
- switch (CharUtilities.classOf(charIter.nextChar())) {
- case CharUtilities.XMLWHITESPACE:
- /* Some kind of whitespace character, except linefeed. */
- boolean bIgnore = false;
-
- switch (wsTreatment) {
- case Constants.IGNORE:
- bIgnore = true;
- break;
- case Constants.IGNORE_IF_BEFORE_LINEFEED:
- bIgnore = lfCheck.nextIsLF();
- break;
- case Constants.IGNORE_IF_SURROUNDING_LINEFEED:
- bIgnore = (bPrevWasLF ||
- lfCheck.nextIsLF());
- break;
- case Constants.IGNORE_IF_AFTER_LINEFEED:
- bIgnore = bPrevWasLF;
- break;
- }
- // Handle ignore
- if (bIgnore) {
- charIter.remove();
- } else if (bWScollapse) {
- if (bInWS || (lfTreatment ==
- Constants.PRESERVE &&
- (bPrevWasLF || lfCheck.nextIsLF()))) {
- charIter.remove();
- } else {
- bInWS = true;
- }
- }
- break;
-
- case CharUtilities.LINEFEED:
- /* A linefeed */
- lfCheck.reset();
- bPrevWasLF = true; // for following whitespace
-
- switch (lfTreatment) {
- case Constants.IGNORE:
- charIter.remove();
- break;
- case Constants.TREAT_AS_SPACE:
- if (bInWS) {
- // only if bWScollapse=true
- charIter.remove();
- } else {
- if (bWScollapse)
- bInWS = true;
- charIter.replaceChar('\u0020');
- }
- break;
- case Constants.TREAT_AS_ZERO_WIDTH_SPACE:
- charIter.replaceChar('\u200b');
- // Fall through: this isn't XML whitespace
- case Constants.PRESERVE:
- bInWS = false;
- break;
- }
- break;
-
- case CharUtilities.EOT:
- // A "boundary" objects such as non-character inline
- // or nested block object was encountered.
- // If any whitespace run in progress, finish it.
- // FALL THROUGH
-
- case CharUtilities.UCWHITESPACE: // Non XML-whitespace
- case CharUtilities.NONWHITESPACE:
- /* Any other character */
- bInWS = bPrevWasLF = false;
- lfCheck.reset();
- break;
- }
- }
- firstInlineChild = null;
- }
- }
-
- private static class LFchecker {
- private boolean bNextIsLF = false;
- private RecursiveCharIterator charIter;
-
- LFchecker(RecursiveCharIterator charIter) {
- this.charIter = charIter;
- }
-
- boolean nextIsLF() {
- if (bNextIsLF == false) {
- CharIterator lfIter = charIter.mark();
- while (lfIter.hasNext()) {
- char c = lfIter.nextChar();
- if (c == '\n') {
- bNextIsLF = true;
- break;
- } else if (CharUtilities.classOf(c) !=
- CharUtilities.XMLWHITESPACE) {
- break;
- }
- }
- }
- return bNextIsLF;
- }
-
- void reset() {
- bNextIsLF = false;
- }
- }
- }
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