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Open HTML to PDF is a CSS 2.1 renderer written in Java. This artifact contains the core rendering and layout code.
/*
* {{{ header & license
* Copyright (c) 2004, 2005 Joshua Marinacci, Torbjoern Gannholm
* Copyright (c) 2005 Wisconsin Court System
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* }}}
*/
package com.openhtmltopdf.layout;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.w3c.dom.Element;
import com.openhtmltopdf.bidi.ParagraphSplitter;
import com.openhtmltopdf.bidi.ParagraphSplitter.Paragraph;
import com.openhtmltopdf.css.constants.CSSName;
import com.openhtmltopdf.css.constants.IdentValue;
import com.openhtmltopdf.css.style.CalculatedStyle;
import com.openhtmltopdf.css.style.CssContext;
import com.openhtmltopdf.css.style.derived.BorderPropertySet;
import com.openhtmltopdf.css.style.derived.RectPropertySet;
import com.openhtmltopdf.render.AnonymousBlockBox;
import com.openhtmltopdf.render.BlockBox;
import com.openhtmltopdf.render.Box;
import com.openhtmltopdf.render.FSFontMetrics;
import com.openhtmltopdf.render.FloatDistances;
import com.openhtmltopdf.render.InlineBox;
import com.openhtmltopdf.render.InlineLayoutBox;
import com.openhtmltopdf.render.InlineText;
import com.openhtmltopdf.render.LineBox;
import com.openhtmltopdf.render.MarkerData;
import com.openhtmltopdf.render.StrutMetrics;
import com.openhtmltopdf.render.TextDecoration;
/**
* This class is responsible for flowing inline content into lines. Block
* content which participates in an inline formatting context is also handled
* here as well as floating and absolutely positioned content.
*/
public class InlineBoxing {
private InlineBoxing() {
}
public static void layoutContent(LayoutContext c, BlockBox box, int initialY, int breakAtLine) {
Element blockElement = box.getElement();
Paragraph para = c.getParagraphSplitter().lookupBlockElement(blockElement);
byte blockLayoutDirection = para.getActualDirection();
int maxAvailableWidth = box.getContentWidth();
int remainingWidth = maxAvailableWidth;
LineBox currentLine = newLine(c, initialY, box);
currentLine.setDirectionality(blockLayoutDirection);
LineBox previousLine = null;
InlineLayoutBox currentIB = null;
InlineLayoutBox previousIB = null;
int contentStart = 0;
List openInlineBoxes = null;
Map iBMap = new HashMap();
if (box instanceof AnonymousBlockBox) {
openInlineBoxes = ((AnonymousBlockBox)box).getOpenInlineBoxes();
if (openInlineBoxes != null) {
openInlineBoxes = new ArrayList(openInlineBoxes);
currentIB = addOpenInlineBoxes(
c, currentLine, openInlineBoxes, maxAvailableWidth, iBMap);
}
}
if (openInlineBoxes == null) {
openInlineBoxes = new ArrayList();
}
remainingWidth -= c.getBlockFormattingContext().getFloatDistance(c, currentLine, remainingWidth);
CalculatedStyle parentStyle = box.getStyle();
int minimumLineHeight = (int) parentStyle.getLineHeight(c);
int indent = (int) parentStyle.getFloatPropertyProportionalWidth(CSSName.TEXT_INDENT, maxAvailableWidth, c);
remainingWidth -= indent;
contentStart += indent;
MarkerData markerData = c.getCurrentMarkerData();
if (markerData != null && box.getStyle().isListMarkerInside()) {
remainingWidth -= markerData.getLayoutWidth();
contentStart += markerData.getLayoutWidth();
}
c.setCurrentMarkerData(null);
List pendingFloats = new ArrayList();
int pendingLeftMBP = 0;
int pendingRightMBP = 0;
boolean hasFirstLinePEs = false;
List pendingInlineLayers = new ArrayList();
if (c.getFirstLinesTracker().hasStyles()) {
box.styleText(c, c.getFirstLinesTracker().deriveAll(box.getStyle()));
hasFirstLinePEs = true;
}
boolean needFirstLetter = c.getFirstLettersTracker().hasStyles();
boolean zeroWidthInlineBlock = false;
int lineOffset = 0;
for (Iterator i = box.getInlineContent().iterator(); i.hasNext(); ) {
Styleable node = (Styleable)i.next();
if (node.getStyle().isInline()) {
InlineBox iB = (InlineBox)node;
CalculatedStyle style = iB.getStyle();
if (iB.isStartsHere()) {
previousIB = currentIB;
currentIB = new InlineLayoutBox(c, iB.getElement(), style, maxAvailableWidth);
openInlineBoxes.add(iB);
iBMap.put(iB, currentIB);
if (previousIB == null) {
currentLine.addChildForLayout(c, currentIB);
} else {
previousIB.addInlineChild(c, currentIB);
}
if (currentIB.getElement() != null) {
String name = c.getNamespaceHandler().getAnchorName(currentIB.getElement());
if (name != null) {
c.addBoxId(name, currentIB);
}
String id = c.getNamespaceHandler().getID(currentIB.getElement());
if (id != null) {
c.addBoxId(id, currentIB);
}
}
//To break the line well, assume we don't just want to paint padding on next line
pendingLeftMBP += style.getMarginBorderPadding(
c, maxAvailableWidth, CalculatedStyle.LEFT);
pendingRightMBP += style.getMarginBorderPadding(
c, maxAvailableWidth, CalculatedStyle.RIGHT);
}
LineBreakContext lbContext = new LineBreakContext();
lbContext.setMaster(iB.getText());
lbContext.setTextNode(iB.getTextNode());
if (iB.isDynamicFunction()) {
lbContext.setMaster(iB.getContentFunction().getLayoutReplacementText());
}
do {
lbContext.reset();
int fit = 0;
if (lbContext.getStart() == 0) {
fit += pendingLeftMBP + pendingRightMBP;
}
boolean trimmedLeadingSpace = false;
if (hasTrimmableLeadingSpace(
currentLine, style, lbContext, zeroWidthInlineBlock)) {
trimmedLeadingSpace = true;
trimLeadingSpace(lbContext);
}
lbContext.setEndsOnNL(false);
zeroWidthInlineBlock = false;
if (lbContext.getStartSubstring().length() == 0) {
break;
}
if (needFirstLetter && !lbContext.isFinished()) {
InlineLayoutBox firstLetter =
addFirstLetterBox(c, currentLine, currentIB, lbContext,
maxAvailableWidth, remainingWidth, iB.getTextDirection());
remainingWidth -= firstLetter.getInlineWidth();
if (currentIB.isStartsHere()) {
pendingLeftMBP -= currentIB.getStyle().getMarginBorderPadding(
c, maxAvailableWidth, CalculatedStyle.LEFT);
}
needFirstLetter = false;
} else {
lbContext.saveEnd();
InlineText inlineText = layoutText(
c, iB.getStyle(), remainingWidth - fit, lbContext, false, iB.getTextDirection());
if (iB.getStyle().hasLetterSpacing()) {
inlineText.setLetterSpacing(iB.getStyle().getFloatPropertyProportionalWidth(CSSName.LETTER_SPACING, 0, c));
}
if (lbContext.isUnbreakable() && ! currentLine.isContainsContent()) {
int delta = c.getBlockFormattingContext().getNextLineBoxDelta(c, currentLine, maxAvailableWidth);
if (delta > 0) {
currentLine.setY(currentLine.getY() + delta);
currentLine.calcCanvasLocation();
remainingWidth = maxAvailableWidth;
remainingWidth -= c.getBlockFormattingContext().getFloatDistance(c, currentLine, maxAvailableWidth);
lbContext.resetEnd();
continue;
}
}
if (!lbContext.isUnbreakable() ||
(lbContext.isUnbreakable() && ! currentLine.isContainsContent())) {
if (iB.isDynamicFunction()) {
inlineText.setFunctionData(new FunctionData(
iB.getContentFunction(), iB.getFunction()));
}
inlineText.setTrimmedLeadingSpace(trimmedLeadingSpace);
currentLine.setContainsDynamicFunction(inlineText.isDynamicFunction());
currentIB.addInlineChild(c, inlineText);
currentLine.setContainsContent(true);
lbContext.setStart(lbContext.getEnd());
remainingWidth -= inlineText.getWidth();
if (currentIB.isStartsHere()) {
int marginBorderPadding =
currentIB.getStyle().getMarginBorderPadding(
c, maxAvailableWidth, CalculatedStyle.LEFT);
pendingLeftMBP -= marginBorderPadding;
remainingWidth -= marginBorderPadding;
}
} else {
lbContext.resetEnd();
}
}
if (lbContext.isNeedsNewLine()) {
saveLine(currentLine, c, box, minimumLineHeight,
maxAvailableWidth, pendingFloats,
hasFirstLinePEs, pendingInlineLayers, markerData,
contentStart, isAlwaysBreak(c, box, breakAtLine, lineOffset));
lineOffset++;
markerData = null;
contentStart = 0;
if (currentLine.isFirstLine() && hasFirstLinePEs) {
lbContext.setMaster(TextUtil.transformText(iB.getText(), iB.getStyle()));
}
previousLine = currentLine;
currentLine = newLine(c, previousLine, box);
currentLine.setDirectionality(blockLayoutDirection);
currentIB = addOpenInlineBoxes(
c, currentLine, openInlineBoxes, maxAvailableWidth, iBMap);
previousIB = currentIB.getParent() instanceof LineBox ?
null : (InlineLayoutBox) currentIB.getParent();
remainingWidth = maxAvailableWidth;
remainingWidth -= c.getBlockFormattingContext().getFloatDistance(c, currentLine, remainingWidth);
}
} while (!lbContext.isFinished());
if (iB.isEndsHere()) {
int rightMBP = style.getMarginBorderPadding(
c, maxAvailableWidth, CalculatedStyle.RIGHT);
pendingRightMBP -= rightMBP;
remainingWidth -= rightMBP;
openInlineBoxes.remove(openInlineBoxes.size() - 1);
if (currentIB.isPending()) {
currentIB.unmarkPending(c);
// Reset to correct value
currentIB.setStartsHere(iB.isStartsHere());
}
currentIB.setEndsHere(true);
if (currentIB.getStyle().requiresLayer()) {
if (! currentIB.isPending() && (currentIB.getElement() == null ||
currentIB.getElement() != c.getLayer().getMaster().getElement())) {
throw new RuntimeException("internal error");
}
if (! currentIB.isPending()) {
c.getLayer().setEnd(currentIB);
c.popLayer();
pendingInlineLayers.add(currentIB.getContainingLayer());
}
}
previousIB = currentIB;
currentIB = currentIB.getParent() instanceof LineBox ?
null : (InlineLayoutBox) currentIB.getParent();
}
} else {
BlockBox child = (BlockBox)node;
if (child.getStyle().isNonFlowContent()) {
remainingWidth -= processOutOfFlowContent(
c, currentLine, child, remainingWidth, pendingFloats);
} else if (child.getStyle().isInlineBlock() || child.getStyle().isInlineTable()) {
layoutInlineBlockContent(c, box, child, initialY);
if (child.getWidth() > remainingWidth && currentLine.isContainsContent()) {
saveLine(currentLine, c, box, minimumLineHeight,
maxAvailableWidth, pendingFloats, hasFirstLinePEs,
pendingInlineLayers, markerData, contentStart,
isAlwaysBreak(c, box, breakAtLine, lineOffset));
lineOffset++;
markerData = null;
contentStart = 0;
previousLine = currentLine;
currentLine = newLine(c, previousLine, box);
currentLine.setDirectionality(blockLayoutDirection);
currentIB = addOpenInlineBoxes(
c, currentLine, openInlineBoxes, maxAvailableWidth, iBMap);
previousIB = currentIB == null || currentIB.getParent() instanceof LineBox ?
null : (InlineLayoutBox) currentIB.getParent();
remainingWidth = maxAvailableWidth;
remainingWidth -= c.getBlockFormattingContext().getFloatDistance(c, currentLine, remainingWidth);
child.reset(c);
layoutInlineBlockContent(c, box, child, initialY);
}
if (currentIB == null) {
currentLine.addChildForLayout(c, child);
} else {
currentIB.addInlineChild(c, child);
}
currentLine.setContainsContent(true);
currentLine.setContainsBlockLevelContent(true);
remainingWidth -= child.getWidth();
if (currentIB != null && currentIB.isStartsHere()) {
pendingLeftMBP -= currentIB.getStyle().getMarginBorderPadding(
c, maxAvailableWidth, CalculatedStyle.LEFT);
}
needFirstLetter = false;
if (child.getWidth() == 0) {
zeroWidthInlineBlock = true;
}
}
}
}
currentLine.trimTrailingSpace(c);
saveLine(currentLine, c, box, minimumLineHeight,
maxAvailableWidth, pendingFloats, hasFirstLinePEs,
pendingInlineLayers, markerData, contentStart,
isAlwaysBreak(c, box, breakAtLine, lineOffset));
if (currentLine.isFirstLine() && currentLine.getHeight() == 0 && markerData != null) {
c.setCurrentMarkerData(markerData);
}
markerData = null;
box.setContentWidth(maxAvailableWidth);
box.setHeight(currentLine.getY() + currentLine.getHeight());
}
private static boolean isAlwaysBreak(LayoutContext c, BlockBox parent, int breakAtLine, int lineOffset) {
if (parent.isCurrentBreakAtLineContext(c)) {
return lineOffset == breakAtLine;
} else {
return breakAtLine > 0 && lineOffset == breakAtLine;
}
}
private static InlineLayoutBox addFirstLetterBox(LayoutContext c, LineBox current,
InlineLayoutBox currentIB, LineBreakContext lbContext, int maxAvailableWidth,
int remainingWidth, byte textDirection) {
CalculatedStyle previous = currentIB.getStyle();
currentIB.setStyle(c.getFirstLettersTracker().deriveAll(currentIB.getStyle()));
InlineLayoutBox iB = new InlineLayoutBox(c, null, currentIB.getStyle(), maxAvailableWidth);
iB.setStartsHere(true);
iB.setEndsHere(true);
currentIB.addInlineChild(c, iB);
current.setContainsContent(true);
InlineText text = layoutText(c, iB.getStyle(), remainingWidth, lbContext, true, textDirection);
if (iB.getStyle().hasLetterSpacing()) {
text.setLetterSpacing(iB.getStyle().getFloatPropertyProportionalWidth(CSSName.LETTER_SPACING, 0, c));
}
iB.addInlineChild(c, text);
iB.setInlineWidth(text.getWidth());
lbContext.setStart(lbContext.getEnd());
c.getFirstLettersTracker().clearStyles();
currentIB.setStyle(previous);
return iB;
}
private static void layoutInlineBlockContent(
LayoutContext c, BlockBox containingBlock, BlockBox inlineBlock, int initialY) {
inlineBlock.setContainingBlock(containingBlock);
inlineBlock.setContainingLayer(c.getLayer());
inlineBlock.initStaticPos(c, containingBlock, initialY);
inlineBlock.calcCanvasLocation();
inlineBlock.layout(c);
}
/**
* Attempts to layout inline boxes from right to left.
* @param start should be the right edge of the line
* @param current should be the line box.
* @return width of line.
*/
public static int positionHorizontallyRTL(CssContext c, Box current, int start, int width) {
int x = start;
InlineLayoutBox currentIB = null;
if (current instanceof InlineLayoutBox) {
currentIB = (InlineLayoutBox) current;
x -= currentIB.getRightMarginPaddingBorder(c);
}
for (int i = 0; i < current.getChildCount(); i++) {
Box b = current.getChild(i);
if (b instanceof InlineLayoutBox) {
InlineLayoutBox iB = (InlineLayoutBox) b;
int w = positionHorizontallyILBRTL(c, iB, x, width);
positionHorizontallyILBRTL(c, iB, x, w);
x -= w;
iB.setX(x);
}
else {
x -= b.getWidth();
b.setX(x);
}
}
if (currentIB != null) {
x -= currentIB.getLeftMarginBorderPadding(c);
currentIB.setInlineWidth((start - x));
}
return (start - x);
}
private static int positionHorizontallyILBRTL(CssContext c, InlineLayoutBox current, int start, int width) {
// WARNING: This function was created mostly by trial and error!
int xAbs = start;
int xRel = width;
int w;
w = current.getRightMarginPaddingBorder(c);
xAbs -= w;
xRel -= w;
for (int i = 0; i < current.getInlineChildCount(); i++) {
Object child = current.getInlineChild(i);
if (child instanceof InlineLayoutBox) {
InlineLayoutBox iB = (InlineLayoutBox) child;
// FIXME: Inefficient, but we need to call once to get the width and then the
// second time to do the actual layout.
w = positionHorizontallyILBRTL(c, iB, xAbs, width);
w = positionHorizontallyILBRTL(c, iB, xAbs, w);
iB.setX(xAbs - w);
xAbs -= w;
xRel -= w;
} else if (child instanceof InlineText) {
InlineText iT = (InlineText) child;
xAbs -= iT.getWidth();
xRel -= iT.getWidth();
iT.setX(xRel);
} else if (child instanceof Box) {
Box b = (Box) child;
xAbs -= b.getWidth();
xRel -= b.getWidth();
b.setX(xAbs);
}
}
w = current.getLeftMarginBorderPadding(c);
xAbs -= w;
xRel -= w;
current.setInlineWidth(start - xAbs);
return start - xAbs;
}
public static int positionHorizontally(CssContext c, Box current, int start) {
int x = start;
InlineLayoutBox currentIB = null;
if (current instanceof InlineLayoutBox) {
currentIB = (InlineLayoutBox)current;
x += currentIB.getLeftMarginBorderPadding(c);
}
for (int i = 0; i < current.getChildCount(); i++) {
Box b = current.getChild(i);
if (b instanceof InlineLayoutBox) {
InlineLayoutBox iB = (InlineLayoutBox) current.getChild(i);
iB.setX(x);
x += positionHorizontally(c, iB, x);
} else {
b.setX(x);
x += b.getWidth();
}
}
if (currentIB != null) {
x += currentIB.getRightMarginPaddingBorder(c);
currentIB.setInlineWidth(x - start);
}
return x - start;
}
private static int positionHorizontally(CssContext c, InlineLayoutBox current, int start) {
int x = start;
x += current.getLeftMarginBorderPadding(c);
for (int i = 0; i < current.getInlineChildCount(); i++) {
Object child = current.getInlineChild(i);
if (child instanceof InlineLayoutBox) {
InlineLayoutBox iB = (InlineLayoutBox) child;
iB.setX(x);
x += positionHorizontally(c, iB, x);
} else if (child instanceof InlineText) {
InlineText iT = (InlineText) child;
iT.setX(x - start);
x += iT.getWidth();
} else if (child instanceof Box) {
Box b = (Box) child;
b.setX(x);
x += b.getWidth();
}
}
x += current.getRightMarginPaddingBorder(c);
current.setInlineWidth(x - start);
return x - start;
}
public static StrutMetrics createDefaultStrutMetrics(LayoutContext c, Box container) {
FSFontMetrics strutM = container.getStyle().getFSFontMetrics(c);
InlineBoxMeasurements measurements = getInitialMeasurements(c, container, strutM);
return new StrutMetrics(
strutM.getAscent(), measurements.getBaseline(), strutM.getDescent());
}
private static void positionVertically(
LayoutContext c, Box container, LineBox current, MarkerData markerData) {
if (current.getChildCount() == 0 || ! current.isContainsVisibleContent()) {
current.setHeight(0);
} else {
FSFontMetrics strutM = container.getStyle().getFSFontMetrics(c);
VerticalAlignContext vaContext = new VerticalAlignContext();
InlineBoxMeasurements measurements = getInitialMeasurements(c, container, strutM);
vaContext.setInitialMeasurements(measurements);
List lBDecorations = calculateTextDecorations(
container, measurements.getBaseline(), strutM);
if (lBDecorations != null) {
current.setTextDecorations(lBDecorations);
}
for (int i = 0; i < current.getChildCount(); i++) {
Box child = current.getChild(i);
positionInlineContentVertically(c, vaContext, child);
}
vaContext.alignChildren();
current.setHeight(vaContext.getLineBoxHeight());
int paintingTop = vaContext.getPaintingTop();
int paintingBottom = vaContext.getPaintingBottom();
if (vaContext.getInlineTop() < 0) {
moveLineContents(current, -vaContext.getInlineTop());
if (lBDecorations != null) {
for (Iterator i = lBDecorations.iterator(); i.hasNext(); ) {
TextDecoration lBDecoration = (TextDecoration)i.next();
lBDecoration.setOffset(lBDecoration.getOffset() - vaContext.getInlineTop());
}
}
paintingTop -= vaContext.getInlineTop();
paintingBottom -= vaContext.getInlineTop();
}
if (markerData != null) {
StrutMetrics strutMetrics = markerData.getStructMetrics();
strutMetrics.setBaseline(measurements.getBaseline() - vaContext.getInlineTop());
markerData.setReferenceLine(current);
current.setMarkerData(markerData);
}
current.setBaseline(measurements.getBaseline() - vaContext.getInlineTop());
current.setPaintingTop(paintingTop);
current.setPaintingHeight(paintingBottom - paintingTop);
}
}
private static void positionInlineVertically(LayoutContext c,
VerticalAlignContext vaContext, InlineLayoutBox iB) {
InlineBoxMeasurements iBMeasurements = calculateInlineMeasurements(c, iB, vaContext);
vaContext.pushMeasurements(iBMeasurements);
positionInlineChildrenVertically(c, iB, vaContext);
vaContext.popMeasurements();
}
private static void positionInlineBlockVertically(
LayoutContext c, VerticalAlignContext vaContext, BlockBox inlineBlock) {
int baseline = inlineBlock.calcInlineBaseline(c);
int ascent = baseline;
int descent = inlineBlock.getHeight() - baseline;
alignInlineContent(c, inlineBlock, ascent, descent, vaContext);
vaContext.updateInlineTop(inlineBlock.getY());
vaContext.updatePaintingTop(inlineBlock.getY());
vaContext.updateInlineBottom(inlineBlock.getY() + inlineBlock.getHeight());
vaContext.updatePaintingBottom(inlineBlock.getY() + inlineBlock.getHeight());
}
private static void moveLineContents(LineBox current, int ty) {
for (int i = 0; i < current.getChildCount(); i++) {
Box child = current.getChild(i);
child.setY(child.getY() + ty);
if (child instanceof InlineLayoutBox) {
moveInlineContents((InlineLayoutBox) child, ty);
}
}
}
private static void moveInlineContents(InlineLayoutBox box, int ty) {
for (int i = 0; i < box.getInlineChildCount(); i++) {
Object obj = box.getInlineChild(i);
if (obj instanceof Box) {
((Box) obj).setY(((Box) obj).getY() + ty);
if (obj instanceof InlineLayoutBox) {
moveInlineContents((InlineLayoutBox) obj, ty);
}
}
}
}
private static InlineBoxMeasurements calculateInlineMeasurements(LayoutContext c, InlineLayoutBox iB,
VerticalAlignContext vaContext) {
FSFontMetrics fm = iB.getStyle().getFSFontMetrics(c);
CalculatedStyle style = iB.getStyle();
float lineHeight = style.getLineHeight(c);
int halfLeading = Math.round((lineHeight - iB.getStyle().getFont(c).size) / 2);
if (halfLeading > 0) {
halfLeading = Math.round((lineHeight -
(fm.getDescent() + fm.getAscent())) / 2);
}
iB.setBaseline(Math.round(fm.getAscent()));
alignInlineContent(c, iB, fm.getAscent(), fm.getDescent(), vaContext);
List decorations = calculateTextDecorations(iB, iB.getBaseline(), fm);
if (decorations != null) {
iB.setTextDecorations(decorations);
}
InlineBoxMeasurements result = new InlineBoxMeasurements();
result.setBaseline(iB.getY() + iB.getBaseline());
result.setInlineTop(iB.getY() - halfLeading);
result.setInlineBottom(Math.round(result.getInlineTop() + lineHeight));
result.setTextTop(iB.getY());
result.setTextBottom((int) (result.getBaseline() + fm.getDescent()));
RectPropertySet padding = iB.getPadding(c);
BorderPropertySet border = iB.getBorder(c);
result.setPaintingTop((int)Math.floor(iB.getY() - border.top() - padding.top()));
result.setPaintingBottom((int)Math.ceil(iB.getY() +
fm.getAscent() + fm.getDescent() +
border.bottom() + padding.bottom()));
return result;
}
public static List calculateTextDecorations(Box box, int baseline,
FSFontMetrics fm) {
List result = null;
CalculatedStyle style = box.getStyle();
List idents = style.getTextDecorations();
if (idents != null) {
result = new ArrayList(idents.size());
if (idents.contains(IdentValue.UNDERLINE)) {
TextDecoration decoration = new TextDecoration(IdentValue.UNDERLINE);
// JDK returns zero so create additional space equal to one
// "underlineThickness"
if (fm.getUnderlineOffset() == 0) {
decoration.setOffset(Math.round((baseline + fm.getUnderlineThickness())));
} else {
decoration.setOffset(Math.round((baseline + fm.getUnderlineOffset())));
}
decoration.setThickness(Math.round(fm.getUnderlineThickness()));
// JDK on Linux returns some goofy values for
// LineMetrics.getUnderlineOffset(). Compensate by always
// making sure underline fits inside the descender
if (fm.getUnderlineOffset() == 0) { // HACK, are we running under the JDK
int maxOffset =
baseline + (int)fm.getDescent() - decoration.getThickness();
if (decoration.getOffset() > maxOffset) {
decoration.setOffset(maxOffset);
}
}
result.add(decoration);
}
if (idents.contains(IdentValue.LINE_THROUGH)) {
TextDecoration decoration = new TextDecoration(IdentValue.LINE_THROUGH);
decoration.setOffset(Math.round(baseline + fm.getStrikethroughOffset()));
decoration.setThickness(Math.round(fm.getStrikethroughThickness()));
result.add(decoration);
}
if (idents.contains(IdentValue.OVERLINE)) {
TextDecoration decoration = new TextDecoration(IdentValue.OVERLINE);
decoration.setOffset(0);
decoration.setThickness(Math.round(fm.getUnderlineThickness()));
result.add(decoration);
}
}
return result;
}
// XXX vertical-align: super/middle/sub could be improved (in particular,
// super and sub should be sized by the measurements of our inline parent
// not us)
private static void alignInlineContent(LayoutContext c, Box box,
float ascent, float descent, VerticalAlignContext vaContext) {
InlineBoxMeasurements measurements = vaContext.getParentMeasurements();
CalculatedStyle style = box.getStyle();
if (style.isLength(CSSName.VERTICAL_ALIGN)) {
box.setY((int) (measurements.getBaseline() - ascent -
style.getFloatPropertyProportionalTo(CSSName.VERTICAL_ALIGN, style.getLineHeight(c), c)));
} else {
IdentValue vAlign = style.getIdent(CSSName.VERTICAL_ALIGN);
if (vAlign == IdentValue.BASELINE) {
box.setY(Math.round(measurements.getBaseline() - ascent));
} else if (vAlign == IdentValue.TEXT_TOP) {
box.setY(measurements.getTextTop());
} else if (vAlign == IdentValue.TEXT_BOTTOM) {
box.setY(Math.round(measurements.getTextBottom() - descent - ascent));
} else if (vAlign == IdentValue.MIDDLE) {
// FIXME: findbugs, loss of precision, try / (float)2
box.setY(Math.round((measurements.getBaseline() - measurements.getTextTop()) / 2
- (ascent + descent) / 2));
} else if (vAlign == IdentValue.SUPER) {
box.setY(Math.round(measurements.getBaseline() - (3*ascent/2)));
} else if (vAlign == IdentValue.SUB) {
box.setY(Math.round(measurements.getBaseline() - ascent / 2));
} else {
box.setY(Math.round(measurements.getBaseline() - ascent));
}
}
}
private static InlineBoxMeasurements getInitialMeasurements(
LayoutContext c, Box container, FSFontMetrics strutM) {
float lineHeight = container.getStyle().getLineHeight(c);
int halfLeading = Math.round((lineHeight -
container.getStyle().getFont(c).size) / 2);
if (halfLeading > 0) {
halfLeading = Math.round((lineHeight -
(strutM.getDescent() + strutM.getAscent())) / 2);
}
InlineBoxMeasurements measurements = new InlineBoxMeasurements();
measurements.setBaseline((int) (halfLeading + strutM.getAscent()));
measurements.setTextTop(halfLeading);
measurements.setTextBottom((int) (measurements.getBaseline() + strutM.getDescent()));
measurements.setInlineTop(halfLeading);
measurements.setInlineBottom((int) (halfLeading + lineHeight));
return measurements;
}
private static void positionInlineChildrenVertically(LayoutContext c, InlineLayoutBox current,
VerticalAlignContext vaContext) {
for (int i = 0; i < current.getInlineChildCount(); i++) {
Object child = current.getInlineChild(i);
if (child instanceof Box) {
positionInlineContentVertically(c, vaContext, (Box)child);
}
}
}
private static void positionInlineContentVertically(LayoutContext c,
VerticalAlignContext vaContext, Box child) {
VerticalAlignContext vaTarget = vaContext;
if (! child.getStyle().isLength(CSSName.VERTICAL_ALIGN)) {
IdentValue vAlign = child.getStyle().getIdent(
CSSName.VERTICAL_ALIGN);
if (vAlign == IdentValue.TOP || vAlign == IdentValue.BOTTOM) {
vaTarget = vaContext.createChild(child);
}
}
if (child instanceof InlineLayoutBox) {
InlineLayoutBox iB = (InlineLayoutBox) child;
positionInlineVertically(c, vaTarget, iB);
} else { // any other Box class
positionInlineBlockVertically(c, vaTarget, (BlockBox)child);
}
}
private static void saveLine(LineBox current, LayoutContext c,
BlockBox block, int minHeight,
int maxAvailableWidth, List pendingFloats,
boolean hasFirstLinePCs, List pendingInlineLayers,
MarkerData markerData, int contentStart, boolean alwaysBreak) {
current.setContentStart(contentStart);
current.prunePendingInlineBoxes();
int totalLineWidth;
if (current.isLayedOutRTL()) {
totalLineWidth = positionHorizontallyRTL(c, current, 0, 0);
positionHorizontallyRTL(c, current, totalLineWidth, totalLineWidth);
}
else {
totalLineWidth = positionHorizontally(c, current, 0);
}
current.setContentWidth(totalLineWidth);
positionVertically(c, block, current, markerData);
// XXX Revisit this. Do we need this when dealing with unbreakable
// text? Is a line required to always have a minimum height?
if (current.getHeight() != 0 &&
current.getHeight() < minHeight &&
! current.isContainsOnlyBlockLevelContent()) {
current.setHeight(minHeight);
}
if (c.isPrint()) {
current.checkPagePosition(c, alwaysBreak);
}
alignLine(c, current, maxAvailableWidth);
current.calcChildLocations();
block.addChildForLayout(c, current);
if (pendingInlineLayers.size() > 0) {
finishPendingInlineLayers(c, pendingInlineLayers);
pendingInlineLayers.clear();
}
if (hasFirstLinePCs && current.isFirstLine()) {
c.getFirstLinesTracker().clearStyles();
block.styleText(c);
}
if (pendingFloats.size() > 0) {
for (Iterator i = pendingFloats.iterator(); i.hasNext(); ) {
FloatLayoutResult layoutResult = (FloatLayoutResult)i.next();
LayoutUtil.layoutFloated(c, current, layoutResult.getBlock(), maxAvailableWidth, null);
current.addNonFlowContent(layoutResult.getBlock());
}
pendingFloats.clear();
}
}
private static void alignLine(final LayoutContext c, final LineBox current, final int maxAvailableWidth) {
if (! current.isContainsDynamicFunction() && ! current.getParent().getStyle().isTextJustify()) {
current.setFloatDistances(new FloatDistances() {
public int getLeftFloatDistance() {
return c.getBlockFormattingContext().getLeftFloatDistance(c, current, maxAvailableWidth);
}
public int getRightFloatDistance() {
return c.getBlockFormattingContext().getRightFloatDistance(c, current, maxAvailableWidth);
}
});
} else {
FloatDistances distances = new FloatDistances();
distances.setLeftFloatDistance(
c.getBlockFormattingContext().getLeftFloatDistance(
c, current, maxAvailableWidth));
distances.setRightFloatDistance(
c.getBlockFormattingContext().getRightFloatDistance(
c, current, maxAvailableWidth));
current.setFloatDistances(distances);
}
current.align(false, c);
if (! current.isContainsDynamicFunction() && ! current.getParent().getStyle().isTextJustify()) {
current.setFloatDistances(null);
}
}
private static void finishPendingInlineLayers(LayoutContext c, List layers) {
for (int i = 0; i < layers.size(); i++) {
Layer l = (Layer)layers.get(i);
l.positionChildren(c);
}
}
private static InlineText layoutText(LayoutContext c, CalculatedStyle style, int remainingWidth,
LineBreakContext lbContext, boolean needFirstLetter, byte textDirection) {
InlineText result = new InlineText();
String masterText = lbContext.getMaster();
if (needFirstLetter) {
masterText = TextUtil.transformFirstLetterText(masterText, style);
lbContext.setMaster(masterText);
Breaker.breakFirstLetter(c, lbContext, remainingWidth, style);
} else {
Breaker.breakText(c, lbContext, remainingWidth, style);
}
result.setMasterText(masterText);
result.setTextNode(lbContext.getTextNode());
result.setSubstring(lbContext.getStart(), lbContext.getEnd());
result.setWidth(lbContext.getWidth());
result.setTextDirection(textDirection);
return result;
}
private static int processOutOfFlowContent(
LayoutContext c, LineBox current, BlockBox block,
int available, List pendingFloats) {
int result = 0;
CalculatedStyle style = block.getStyle();
if (style.isAbsolute() || style.isFixed()) {
LayoutUtil.layoutAbsolute(c, current, block);
current.addNonFlowContent(block);
} else if (style.isFloated()) {
FloatLayoutResult layoutResult = LayoutUtil.layoutFloated(
c, current, block, available, pendingFloats);
if (layoutResult.isPending()) {
pendingFloats.add(layoutResult);
} else {
result = layoutResult.getBlock().getWidth();
current.addNonFlowContent(layoutResult.getBlock());
}
} else if (style.isRunning()) {
block.setStaticEquivalent(current);
c.getRootLayer().addRunningBlock(block);
}
return result;
}
private static boolean hasTrimmableLeadingSpace(
LineBox line, CalculatedStyle style, LineBreakContext lbContext,
boolean zeroWidthInlineBlock) {
if ((! line.isContainsContent() || zeroWidthInlineBlock) &&
lbContext.getStartSubstring().startsWith(WhitespaceStripper.SPACE)) {
IdentValue whitespace = style.getWhitespace();
if (whitespace == IdentValue.NORMAL
|| whitespace == IdentValue.NOWRAP
|| whitespace == IdentValue.PRE_LINE
|| (whitespace == IdentValue.PRE_WRAP
&& lbContext.getStart() > 0
&& (lbContext.getMaster().length() > lbContext.getStart() - 1)
&& lbContext.getMaster().charAt(lbContext.getStart() - 1) != WhitespaceStripper.EOLC)) {
return true;
}
}
return false;
}
private static void trimLeadingSpace(LineBreakContext lbContext) {
String s = lbContext.getStartSubstring();
int i = 0;
while (i < s.length() && s.charAt(i) == ' ') {
i++;
}
lbContext.setStart(lbContext.getStart() + i);
}
private static LineBox newLine(LayoutContext c, LineBox previousLine, Box box) {
int y = 0;
if (previousLine != null) {
y = previousLine.getY() + previousLine.getHeight();
}
return newLine(c, y, box);
}
private static LineBox newLine(LayoutContext c, int y, Box box) {
LineBox result = new LineBox();
result.setStyle(box.getStyle().createAnonymousStyle(IdentValue.BLOCK));
result.setParent(box);
result.initContainingLayer(c);
result.setY(y);
result.calcCanvasLocation();
return result;
}
private static InlineLayoutBox addOpenInlineBoxes(
LayoutContext c, LineBox line, List openParents, int cbWidth, Map iBMap) {
ArrayList result = new ArrayList();
InlineLayoutBox currentIB = null;
InlineLayoutBox previousIB = null;
boolean first = true;
for (Iterator i = openParents.iterator(); i.hasNext();) {
InlineBox iB = (InlineBox)i.next();
currentIB = new InlineLayoutBox(
c, iB.getElement(), iB.getStyle(), cbWidth);
InlineLayoutBox prev = (InlineLayoutBox)iBMap.get(iB);
if (prev != null) {
currentIB.setPending(prev.isPending());
}
iBMap.put(iB, currentIB);
result.add(iB);
if (first) {
line.addChildForLayout(c, currentIB);
first = false;
} else {
previousIB.addInlineChild(c, currentIB, false);
}
previousIB = currentIB;
}
return currentIB;
}
}