package org.xmind.ui.richtext;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.DocumentEvent;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITypedRegion;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.TextPresentation;
import org.eclipse.jface.text.presentation.IPresentationDamager;
import org.eclipse.jface.text.presentation.IPresentationRepairer;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.ITokenScanner;
import org.eclipse.jface.text.rules.Token;
import org.eclipse.swt.custom.StyleRange;
public class RichTextDamagerRepairer implements IPresentationDamager,
IPresentationRepairer {
/** The document this object works on */
protected IDocument fDocument;
/** The scanner it uses */
protected ITokenScanner fScanner;
protected StyleRange defaultStyle;
/**
* Creates a damager/repairer that uses the given scanner. The scanner may
* not be <code>null</code> and is assumed to return only token that carry
* text attributes.
*
* @param scanner
* the token scanner to be used, may not be <code>null</code>
*/
public RichTextDamagerRepairer(ITokenScanner scanner) {
Assert.isNotNull(scanner);
fScanner = scanner;
defaultStyle = (StyleRange) RichTextUtils.DEFAULT_STYLE.clone();
}
/*
* @see IPresentationDamager#setDocument(IDocument)
*
* @see IPresentationRepairer#setDocument(IDocument)
*/
public void setDocument(IDocument document) {
fDocument = document;
}
//---- IPresentationDamager
/**
* Returns the end offset of the line that contains the specified offset or
* if the offset is inside a line delimiter, the end offset of the next
* line.
*
* @param offset
* the offset whose line end offset must be computed
* @return the line end offset for the given offset
* @exception BadLocationException
* if offset is invalid in the current document
*/
protected int endOfLineOf(int offset) throws BadLocationException {
IRegion info = fDocument.getLineInformationOfOffset(offset);
if (offset <= info.getOffset() + info.getLength())
return info.getOffset() + info.getLength();
int line = fDocument.getLineOfOffset(offset);
try {
info = fDocument.getLineInformation(line + 1);
return info.getOffset() + info.getLength();
} catch (BadLocationException x) {
return fDocument.getLength();
}
}
/*
* @see IPresentationDamager#getDamageRegion(ITypedRegion, DocumentEvent,
* boolean)
*/
public IRegion getDamageRegion(ITypedRegion partition, DocumentEvent e,
boolean documentPartitioningChanged) {
if (!documentPartitioningChanged) {
try {
IRegion info = fDocument.getLineInformationOfOffset(e
.getOffset());
int start = Math.max(partition.getOffset(), info.getOffset());
int end = e.getOffset()
+ (e.getText() == null ? e.getLength() : e.getText()
.length());
if (info.getOffset() <= end
&& end <= info.getOffset() + info.getLength()) {
// optimize the case of the same line
end = info.getOffset() + info.getLength();
} else
end = endOfLineOf(end);
end = Math.min(partition.getOffset() + partition.getLength(),
end);
return new Region(start, end - start);
} catch (BadLocationException x) {
}
}
return partition;
}
//---- IPresentationRepairer
/*
* @see IPresentationRepairer#createPresentation(TextPresentation,
* ITypedRegion)
*/
public void createPresentation(TextPresentation presentation,
ITypedRegion region) {
if (fScanner == null) {
// will be removed if deprecated constructor will be removed
addRange(presentation, region.getOffset(), region.getLength(),
defaultStyle);
return;
}
int lastStart = region.getOffset();
int length = 0;
boolean firstToken = true;
IToken lastToken = Token.UNDEFINED;
StyleRange lastAttribute = getTokenTextAttribute(lastToken);
fScanner.setRange(fDocument, lastStart, region.getLength());
while (true) {
IToken token = fScanner.nextToken();
if (token.isEOF())
break;
StyleRange attribute = getTokenTextAttribute(token);
if (lastAttribute != null
&& RichTextUtils.isSimilar(lastAttribute, attribute)) {
length += fScanner.getTokenLength();
firstToken = false;
} else {
if (!firstToken)
addRange(presentation, lastStart, length, lastAttribute);
firstToken = false;
lastToken = token;
lastAttribute = attribute;
lastStart = fScanner.getTokenOffset();
length = fScanner.getTokenLength();
}
}
addRange(presentation, lastStart, length, lastAttribute);
}
/**
* Returns a text attribute encoded in the given token. If the token's data
* is not <code>null</code> and a text attribute it is assumed that it is
* the encoded text attribute. It returns the default text attribute if
* there is no encoded text attribute found.
*
* @param token
* the token whose text attribute is to be determined
* @return the token's text attribute
*/
protected StyleRange getTokenTextAttribute(IToken token) {
Object data = token.getData();
if (data instanceof StyleRange)
return (StyleRange) data;
return defaultStyle;
}
/**
* Adds style information to the given text presentation.
*
* @param presentation
* the text presentation to be extended
* @param offset
* the offset of the range to be styled
* @param length
* the length of the range to be styled
* @param attr
* the attribute describing the style of the range to be styled
*/
protected void addRange(TextPresentation presentation, int offset,
int length, StyleRange attr) {
if (attr != null) {
// int fontStyle = attr.fontStyle;
// StyleRange styleRange = new StyleRange(offset, length, attr
// .getForeground(), attr.getBackground(), fontStyle);
// styleRange.strikeout = (fontStyle & TextAttribute.STRIKETHROUGH) != 0;
// styleRange.underline = (fontStyle & TextAttribute.UNDERLINE) != 0;
// styleRange.font = attr.getFont();
StyleRange styleRange = (StyleRange) attr.clone();
styleRange.start = offset;
styleRange.length = length;
presentation.addStyleRange(styleRange);
}
}
}
