void ChatLineModelItem::computeWrapList() const
{
QString text = _styledMsg.plainContents();
int length = text.length();
if (!length)
return;
QList<ChatLineModel::Word> wplist; // use a temp list which we'll later copy into a QVector for efficiency
QTextBoundaryFinder finder(QTextBoundaryFinder::Line, _styledMsg.plainContents().unicode(), length,
TextBoundaryFinderBuffer, TextBoundaryFinderBufferSize);
int idx;
int oldidx = 0;
ChatLineModel::Word word;
word.start = 0;
qreal wordstartx = 0;
QTextLayout layout(_styledMsg.plainContents());
QTextOption option;
option.setWrapMode(QTextOption::NoWrap);
layout.setTextOption(option);
layout.setAdditionalFormats(QtUi::style()->toTextLayoutList(_styledMsg.contentsFormatList(), length, messageLabel()));
layout.beginLayout();
QTextLine line = layout.createLine();
line.setNumColumns(length);
layout.endLayout();
while ((idx = finder.toNextBoundary()) >= 0 && idx <= length) {
// QTextBoundaryFinder has inconsistent behavior in Qt version up to and including 4.6.3 (at least).
// It doesn't point to the position we should break, but to the character before that.
// Unfortunately Qt decided to fix this by changing the behavior of QTBF, so now we have to add a version
// check. At the time of this writing, I'm still trying to get this reverted upstream...
//
// cf. https://bugs.webkit.org/show_bug.cgi?id=31076 and Qt commit e6ac173
static int needWorkaround = -1;
if (needWorkaround < 0) {
needWorkaround = 0;
QStringList versions = QString(qVersion()).split('.');
if (versions.count() == 3 && versions.at(0).toInt() == 4) {
if (versions.at(1).toInt() <= 6 && versions.at(2).toInt() <= 3)
needWorkaround = 1;
}
}
if (needWorkaround == 1) {
if (idx < length)
idx++;
}
if (idx == oldidx)
continue;
word.start = oldidx;
int wordend = idx;
for (; wordend > word.start; wordend--) {
if (!text.at(wordend-1).isSpace())
break;
}
qreal wordendx = line.cursorToX(wordend);
qreal trailingendx = line.cursorToX(idx);
word.endX = wordendx;
word.width = wordendx - wordstartx;
word.trailing = trailingendx - wordendx;
wordstartx = trailingendx;
wplist.append(word);
oldidx = idx;
}
// A QVector needs less space than a QList
_wrapList.resize(wplist.count());
for (int i = 0; i < wplist.count(); i++) {
_wrapList[i] = wplist.at(i);
}
}