/**
* Sets a styler to use for the given source range. The range must be subrange of actual string of
* this {@link StyledString}. Stylers previously set for that range will be overwritten.
*
* @param offset the start offset of the range
* @param length the length of the range
* @param styler the styler to set
* @throws StringIndexOutOfBoundsException if <code>start</code> is less than zero, or if offset
* plus length is greater than the length of this object.
*/
public void setStyle(int offset, int length, Styler styler)
throws StringIndexOutOfBoundsException {
if (offset < 0 || offset + length > fBuffer.length()) {
throw new StringIndexOutOfBoundsException(
"Invalid offset ("
+ offset
+ ") or length ("
+ length
+ ")"); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$
}
if (length == 0) {
return;
}
final StyleRun lastRun = getLastRun();
if (lastRun == null || lastRun.offset <= offset) {
Styler lastStyler = lastRun == null ? null : lastRun.style;
appendStyleRun(styler, offset);
if (offset + length != fBuffer.length()) {
appendStyleRun(lastStyler, offset + length);
}
return;
}
int endRun = findRun(offset + length);
if (endRun >= 0) {
// run with the same end index, nothing to change
} else {
endRun = -(endRun + 1);
if (offset + length < fBuffer.length()) {
Styler prevStyle = endRun > 0 ? fStyleRuns.getRun(endRun - 1).style : null;
fStyleRuns.add(endRun, new StyleRun(offset + length, prevStyle));
}
}
int startRun = findRun(offset);
if (startRun >= 0) {
// run with the same start index
StyleRun styleRun = fStyleRuns.getRun(startRun);
styleRun.style = styler;
} else {
startRun = -(startRun + 1);
Styler prevStyle = startRun > 0 ? fStyleRuns.getRun(startRun - 1).style : null;
if (isDifferentStyle(prevStyle, styler) || (startRun == 0 && styler != null)) {
fStyleRuns.add(startRun, new StyleRun(offset, styler));
endRun++; // endrun is moved one back
} else {
startRun--; // we use the previous
}
}
if (startRun + 1 < endRun) {
fStyleRuns.removeRange(startRun + 1, endRun);
}
}
private void appendStyleRun(Styler style, int offset) {
StyleRun lastRun = getLastRun();
if (lastRun != null && lastRun.offset == offset) {
lastRun.style = style;
return;
}
if (lastRun == null && style != null
|| lastRun != null && isDifferentStyle(style, lastRun.style)) {
getStyleRuns().add(new StyleRun(offset, style));
}
}
