public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("StyledText with underline and strike through");
shell.setLayout(new FillLayout());
StyledText text = new StyledText(shell, SWT.BORDER);
text.setText("0123456789 ABCDEFGHIJKLM NOPQRSTUVWXYZ");
// make 0123456789 appear underlined
StyleRange style1 = new StyleRange();
style1.start = 0;
style1.length = 10;
style1.underline = true;
text.setStyleRange(style1);
// make ABCDEFGHIJKLM have a strike through
StyleRange style2 = new StyleRange();
style2.start = 11;
style2.length = 13;
style2.strikeout = true;
text.setStyleRange(style2);
// make NOPQRSTUVWXYZ appear underlined and have a strike through
StyleRange style3 = new StyleRange();
style3.start = 25;
style3.length = 13;
style3.underline = true;
style3.strikeout = true;
text.setStyleRange(style3);
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}
/**
* 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, TextAttribute attr) {
if (attr != null) {
int style = attr.getStyle();
int fontStyle = style & (SWT.ITALIC | SWT.BOLD | SWT.NORMAL);
StyleRange styleRange =
new StyleRange(offset, length, attr.getForeground(), attr.getBackground(), fontStyle);
styleRange.strikeout = (style & TextAttribute.STRIKETHROUGH) != 0;
styleRange.underline = (style & TextAttribute.UNDERLINE) != 0;
styleRange.font = attr.getFont();
presentation.addStyleRange(styleRange);
}
}
/** @return Returns a corresponding style range. */
public StyleRange createStyleRange() {
int len = 0;
if (fStyle.isEnabled()) len = getLength();
TextAttribute textAttribute = fStyle.getTextAttribute();
int style = textAttribute.getStyle();
int fontStyle = style & (SWT.ITALIC | SWT.BOLD | SWT.NORMAL);
StyleRange styleRange =
new StyleRange(
getOffset(),
len,
textAttribute.getForeground(),
textAttribute.getBackground(),
fontStyle);
styleRange.strikeout = (style & TextAttribute.STRIKETHROUGH) != 0;
styleRange.underline = (style & TextAttribute.UNDERLINE) != 0;
return styleRange;
}
private void updateStyle(ITextViewer viewer) {
StyledText text = viewer.getTextWidget();
int widgetOffset = getWidgetOffset(viewer, fRememberedStyleRange.start);
StyleRange range = new StyleRange(fRememberedStyleRange);
range.start = widgetOffset;
range.length = fRememberedStyleRange.length;
StyleRange currentRange = text.getStyleRangeAtOffset(widgetOffset);
if (currentRange != null) {
range.strikeout = currentRange.strikeout;
range.underline = currentRange.underline;
range.fontStyle = currentRange.fontStyle;
}
// http://dev.eclipse.org/bugs/show_bug.cgi?id=34754
try {
text.setStyleRange(range);
} catch (IllegalArgumentException x) {
// catching exception as offset + length might be outside of the text widget
fRememberedStyleRange = null;
}
}
private boolean prepareTwigRegions(
Collection<StyleRange> holdResults,
ITwigScriptRegion region,
int regionStart,
int partitionStartOffset,
int partitionLength) {
assert (region.getType() == TwigRegionContext.TWIG_CONTENT
|| region.getType() == TwigRegionContext.TWIG_COMMENT);
StyleRange styleRange = null;
TextAttribute attr;
TextAttribute previousAttr = null;
ITextRegion[] twigTokens = null;
try {
int from;
int length;
if (partitionStartOffset < regionStart) {
from = 0;
length = partitionLength - (regionStart - partitionStartOffset);
} else {
from = partitionStartOffset - regionStart;
length = partitionLength;
}
twigTokens = region.getTwigTokens(from, Math.min(length, region.getLength()));
ITextRegion prevElement = null;
for (int i = 0; i < twigTokens.length; i++) {
ITextRegion element = twigTokens[i];
attr = getAttributeFor(element);
// Check that the elements are different - otherwise the
// coloring is not valid
if (prevElement == element || attr == null) {
continue;
}
if ((styleRange != null)
&& (previousAttr != null)
&& (previousAttr.equals(attr))
&& prevElement != null
&& prevElement.getLength() == prevElement.getLength()) {
// extends the prev styleRange with the current element
// length
styleRange.length += element.getLength();
if (styleRange.start + styleRange.length > partitionStartOffset + partitionLength) {
styleRange.length -=
(styleRange.start + styleRange.length) - (partitionStartOffset + partitionLength);
}
} else {
// create new styleRange
int styleStart = regionStart + element.getStart();
int styleLength = element.getLength();
if (styleStart + styleLength < partitionStartOffset) { // if
// the
// range
// ends
// before
// the
// requested
// starting
// position
// -
// ignoring
// it
continue;
}
if (styleStart < partitionStartOffset) { // if the region
// starts before
// the requested
// starting
// position -
// adjusting the
// style start
// position
styleLength -= (partitionStartOffset - styleStart);
styleStart = partitionStartOffset;
}
if (styleStart > partitionStartOffset + partitionLength) {
// if the region ends after the requested end position -
// making it shorter
styleLength -= styleStart - (partitionStartOffset + partitionLength);
}
if (attr.getBackground() != null && element.getTextEnd() != element.getEnd()) { // in
// case
// of
// background
// color
// make
// sure
// the
// highlighting
// will
// not
// paint
// the
// whitespaces
// applying style to the region w/o the whitespace
styleRange =
new StyleRange(
styleStart,
styleLength - (element.getEnd() - element.getTextEnd()),
attr.getForeground(),
attr.getBackground(),
attr.getStyle());
if ((attr.getStyle() & TextAttribute.UNDERLINE) != 0) {
styleRange.underline = true;
styleRange.fontStyle &= ~TextAttribute.UNDERLINE;
}
if ((attr.getStyle() & TextAttribute.STRIKETHROUGH) != 0) {
styleRange.strikeout = true;
styleRange.fontStyle &= ~TextAttribute.STRIKETHROUGH;
}
holdResults.add(styleRange);
// applying style to the whitespace (important for the
// refresh of the specific range
styleRange =
new StyleRange(
regionStart + element.getTextEnd(),
element.getEnd() - element.getTextEnd(),
attr.getForeground(),
null,
attr.getStyle());
holdResults.add(styleRange);
previousAttr = null;
} else {
styleRange =
new StyleRange(
styleStart,
styleLength,
attr.getForeground(),
attr.getBackground(),
attr.getStyle());
if ((attr.getStyle() & TextAttribute.UNDERLINE) != 0) {
styleRange.underline = true;
styleRange.fontStyle &= ~TextAttribute.UNDERLINE;
}
if ((attr.getStyle() & TextAttribute.STRIKETHROUGH) != 0) {
styleRange.strikeout = true;
styleRange.fontStyle &= ~TextAttribute.STRIKETHROUGH;
}
holdResults.add(styleRange);
// technically speaking, we don't need to update
// previousAttr
// in the other case, because the other case is when
// it hasn't changed
previousAttr = attr;
}
}
prevElement = element;
}
return true;
} catch (BadLocationException e) {
Logger.logException(e);
return false;
}
}