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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.
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/*
* Copyright (c) 2006 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.render;
import java.text.BreakIterator;
import org.w3c.dom.Element;
import com.openhtmltopdf.bidi.BidiSplitter;
import com.openhtmltopdf.css.constants.CSSName;
import com.openhtmltopdf.css.constants.IdentValue;
import com.openhtmltopdf.css.extend.ContentFunction;
import com.openhtmltopdf.css.parser.FSFunction;
import com.openhtmltopdf.css.style.CalculatedStyle;
import com.openhtmltopdf.extend.FSTextBreaker;
import com.openhtmltopdf.layout.Breaker;
import com.openhtmltopdf.layout.LayoutContext;
import com.openhtmltopdf.layout.Styleable;
import com.openhtmltopdf.layout.TextUtil;
import com.openhtmltopdf.layout.WhitespaceStripper;
/**
* A class which represents a portion of an inline element. If an inline element
* does not contain any nested elements, then a single InlineBox
* object will contain the content for the entire element. Otherwise multiple
* InlineBox objects will be created corresponding to each
* discrete chunk of text appearing in the element. It is not rendered directly
* (and hence does not extend from {@link Box}), but does play an important
* role in layout (for example, when calculating min/max widths). Note that it
* does not contain children. Inline content is stored as a flat list in the
* layout tree. However, InlineBox does contain enough
* information to reconstruct the original element nesting and this is, in fact,
* done during inline layout.
*
* @see InlineLayoutBox
*/
public class InlineBox implements Styleable {
private Element _element;
private String _originalText;
private String _text;
private boolean _removableWhitespace;
/**
* See {@link #isStartsHere()}
*/
private boolean _startsHere;
/**
* See {@link #isEndsHere()}
*/
private boolean _endsHere;
private CalculatedStyle _style;
private ContentFunction _contentFunction;
private FSFunction _function;
private boolean _minMaxCalculated;
private int _maxWidth;
private int _minWidth;
private int _firstLineWidth;
private String _pseudoElementOrClass;
public InlineBox(String text) {
_text = text;
_originalText = text;
}
private byte _textDirection;
private BlockBox _footnoteBody;
/**
* @param direction either LTR or RTL from {@link BidiSplitter} interface.
*/
public void setTextDirection(byte direction) {
this._textDirection = direction;
}
/**
* @return either LTR or RTL from {@link BidiSplitter} interface.
*/
public byte getTextDirection() {
return this._textDirection;
}
public String getText() {
return _text;
}
public void setText(String text) {
_text = text;
_originalText = text;
}
public void applyTextTransform() {
_text = _originalText;
_text = TextUtil.transformText(_text, getStyle());
}
public boolean isRemovableWhitespace() {
return _removableWhitespace;
}
public void setRemovableWhitespace(boolean removeableWhitespace) {
_removableWhitespace = removeableWhitespace;
}
/**
* The opposite of {@link #isStartsHere()}
*/
public boolean isEndsHere() {
return _endsHere;
}
/**
* See {@link #isEndsHere()}
*/
public void setEndsHere(boolean endsHere) {
_endsHere = endsHere;
}
/**
* Whether this is the first InlineBox for a box. For example:
*
* [b]one[i]two[/i]three[/b]
*
* will create three InlineBox objects and one and two will return
* true for isStartsHere.
*
* This is used for example to decide whether left margin needs to be applied.
*/
public boolean isStartsHere() {
return _startsHere;
}
/**
* See {@link #isStartsHere()}
*/
public void setStartsHere(boolean startsHere) {
_startsHere = startsHere;
}
@Override
public CalculatedStyle getStyle() {
return _style;
}
@Override
public void setStyle(CalculatedStyle style) {
_style = style;
}
@Override
public Element getElement() {
return _element;
}
@Override
public void setElement(Element element) {
_element = element;
}
public ContentFunction getContentFunction() {
return _contentFunction;
}
public void setContentFunction(ContentFunction contentFunction) {
_contentFunction = contentFunction;
}
public boolean isDynamicFunction() {
return _contentFunction != null;
}
private int getTextWidth(LayoutContext c, String s) {
return c.getTextRenderer().getWidth(
c.getFontContext(),
c.getFont(getStyle().getFont(c)),
s);
}
private int getMaxCharWidth(LayoutContext c, String s) {
char[] chars = s.toCharArray();
int result = 0;
for (int i = 0; i < chars.length; i++) {
int width = getTextWidth(c, Character.toString(chars[i]));
if (width > result) {
result = width;
}
}
return result;
}
private void calcMaxWidthFromLineLength(LayoutContext c, int cbWidth, boolean trim) {
int last = 0;
int current = 0;
while ( (current = _text.indexOf(WhitespaceStripper.EOL, last)) != -1) {
String target = _text.substring(last, current);
if (trim) {
target = target.trim();
}
int length = getTextWidth(c, target);
if (last == 0) {
length += getStyle().getMarginBorderPadding(c, cbWidth, CalculatedStyle.LEFT);
}
if (length > _maxWidth) {
_maxWidth = length;
}
if (last == 0) {
_firstLineWidth = length;
}
last = current + 1;
}
String target = _text.substring(last);
if (trim) {
target = target.trim();
}
int length = getTextWidth(c, target);
length += getStyle().getMarginBorderPadding(c, cbWidth, CalculatedStyle.RIGHT);
if (length > _maxWidth) {
_maxWidth = length;
}
if (last == 0) {
_firstLineWidth = length;
}
}
public int getSpaceWidth(LayoutContext c) {
return c.getTextRenderer().getWidth(
c.getFontContext(),
getStyle().getFSFont(c),
WhitespaceStripper.SPACE);
}
public int getTrailingSpaceWidth(LayoutContext c) {
if (_text.length() > 0 && _text.charAt(_text.length()-1) == ' ') {
return getSpaceWidth(c);
} else {
return 0;
}
}
private int calcMinWidthFromWordLength(
LayoutContext c, int cbWidth, boolean trimLeadingSpace, boolean includeWS) {
int spaceWidth = -1;
int last = 0;
int current = 0;
int maxWidth = 0;
int spaceCount = 0;
boolean haveFirstWord = false;
int firstWord = 0;
int lastWord = 0;
CalculatedStyle style = getStyle();
float letterSpacing = style.hasLetterSpacing()
? style.getFloatPropertyProportionalWidth(CSSName.LETTER_SPACING, 0, c)
: 0f;
String text = getText(trimLeadingSpace);
FSTextBreaker breakIterator = Breaker.getLineBreakStream(text, c.getSharedContext());
// Breaker should be used
while ( (current = breakIterator.next()) != BreakIterator.DONE) {
String currentWord = text.substring(last, current);
if (currentWord.length() > 0 && currentWord.charAt(currentWord.length() - 1) == Breaker.SOFT_HYPHEN) {
currentWord += '-';
}
int wordWidth = getTextWidth(c, currentWord);
int minWordWidth;
if (getStyle().getWordWrap() == IdentValue.BREAK_WORD) {
minWordWidth = getMaxCharWidth(c, currentWord);
} else {
minWordWidth = (int) (wordWidth + (letterSpacing * currentWord.length()));
}
if (spaceCount > 0) {
if (includeWS) {
for (int i = 0; i < spaceCount; i++) {
wordWidth += spaceWidth;
minWordWidth += spaceWidth;
}
} else {
maxWidth += spaceWidth;
}
spaceCount = 0;
}
if (minWordWidth > 0) {
if (! haveFirstWord) {
firstWord = minWordWidth;
}
lastWord = minWordWidth;
}
if (minWordWidth > _minWidth) {
_minWidth = minWordWidth;
}
maxWidth += wordWidth;
last = current;
for (int i = current; i < text.length(); i++) {
if (text.charAt(i) == ' ') {
spaceCount++;
last++;
} else {
break;
}
}
if (spaceCount > 0 && spaceWidth == -1) {
spaceWidth = getSpaceWidth(c);
}
}
String currentWord = text.substring(last);
int wordWidth = getTextWidth(c, currentWord);
int minWordWidth;
if (getStyle().getWordWrap() == IdentValue.BREAK_WORD) {
minWordWidth = getMaxCharWidth(c, currentWord);
} else {
minWordWidth = (int) (wordWidth + (letterSpacing * currentWord.length()));
}
if (spaceCount > 0) {
if (includeWS) {
for (int i = 0; i < spaceCount; i++) {
wordWidth += spaceWidth;
minWordWidth += spaceWidth;
}
} else {
maxWidth += spaceWidth;
}
spaceCount = 0;
}
if (minWordWidth > 0) {
if (! haveFirstWord) {
firstWord = minWordWidth;
}
lastWord = minWordWidth;
}
if (minWordWidth > _minWidth) {
_minWidth = minWordWidth;
}
maxWidth += wordWidth;
if (isStartsHere()) {
int leftMBP = getStyle().getMarginBorderPadding(c, cbWidth, CalculatedStyle.LEFT);
if (firstWord + leftMBP > _minWidth) {
_minWidth = firstWord + leftMBP;
}
maxWidth += leftMBP;
}
if (isEndsHere()) {
int rightMBP = getStyle().getMarginBorderPadding(c, cbWidth, CalculatedStyle.RIGHT);
if (lastWord + rightMBP > _minWidth) {
_minWidth = lastWord + rightMBP;
}
maxWidth += rightMBP;
}
return maxWidth;
}
private String getText(boolean trimLeadingSpace) {
if (! trimLeadingSpace) {
return getText();
} else {
if (_text.length() > 0 && _text.charAt(0) == ' ') {
return _text.substring(1);
} else {
return _text;
}
}
}
private int getInlineMBP(LayoutContext c, int cbWidth) {
return getStyle().getMarginBorderPadding(c, cbWidth, CalculatedStyle.LEFT) +
getStyle().getMarginBorderPadding(c, cbWidth, CalculatedStyle.RIGHT);
}
public void calcMinMaxWidth(LayoutContext c, int cbWidth, boolean trimLeadingSpace) {
if (! _minMaxCalculated) {
IdentValue whitespace = getStyle().getWhitespace();
if (whitespace == IdentValue.NOWRAP) {
_minWidth = _maxWidth = getInlineMBP(c, cbWidth) + getTextWidth(c, getText(trimLeadingSpace));
} else if (whitespace == IdentValue.PRE) {
calcMaxWidthFromLineLength(c, cbWidth, false);
_minWidth = _maxWidth;
} else if (whitespace == IdentValue.PRE_WRAP) {
calcMinWidthFromWordLength(c, cbWidth, false, true);
calcMaxWidthFromLineLength(c, cbWidth, false);
} else if (whitespace == IdentValue.PRE_LINE) {
calcMinWidthFromWordLength(c, cbWidth, trimLeadingSpace, false);
calcMaxWidthFromLineLength(c, cbWidth, true);
} else /* if (whitespace == IdentValue.NORMAL) */ {
_maxWidth = calcMinWidthFromWordLength(c, cbWidth, trimLeadingSpace, false);
}
_minWidth = Math.min(_maxWidth, _minWidth);
_minMaxCalculated = true;
}
}
public int getMaxWidth() {
return _maxWidth;
}
public int getMinWidth() {
return _minWidth;
}
public int getFirstLineWidth() {
return _firstLineWidth;
}
@Override
public String getPseudoElementOrClass() {
return _pseudoElementOrClass;
}
public void setPseudoElementOrClass(String pseudoElementOrClass) {
_pseudoElementOrClass = pseudoElementOrClass;
}
@Override
public String toString() {
StringBuilder result = new StringBuilder();
result.append("InlineBox: ");
if (getElement() != null) {
result.append("<");
result.append(getElement().getNodeName());
result.append("> ");
} else {
result.append("(anonymous) ");
}
if (getPseudoElementOrClass() != null) {
result.append(':');
result.append(getPseudoElementOrClass());
result.append(' ');
}
if (isStartsHere() || isEndsHere()) {
result.append("(");
if (isStartsHere()) {
result.append("S");
}
if (isEndsHere()) {
result.append("E");
}
result.append(") ");
}
appendPositioningInfo(result);
result.append("(");
result.append(shortText());
result.append(") ");
return result.toString();
}
protected void appendPositioningInfo(StringBuilder result) {
if (getStyle().isRelative()) {
result.append("(relative) ");
}
if (getStyle().isFixed()) {
result.append("(fixed) ");
}
if (getStyle().isAbsolute()) {
result.append("(absolute) ");
}
if (getStyle().isFloated()) {
result.append("(floated) ");
}
}
private String shortText() {
if (_text == null) {
return null;
} else {
StringBuilder result = new StringBuilder();
for (int i = 0; i < _text.length() && i < 40; i++) {
char c = _text.charAt(i);
if (c == '\n') {
result.append(' ');
} else {
result.append(c);
}
}
if (result.length() == 40) {
result.append("...");
}
return result.toString();
}
}
public FSFunction getFunction() {
return _function;
}
public void setFunction(FSFunction function) {
_function = function;
}
public void truncateText() {
_text = "";
_originalText = "";
}
public void setFootnote(BlockBox footnoteBody) {
_footnoteBody = footnoteBody;
}
public boolean hasFootnote() {
return getFootnoteBody() != null;
}
public BlockBox getFootnoteBody() {
return _footnoteBody;
}
}