+ // neither pre- or append means we have to do dirty work: move items...
+ int moveStart = 0;
+ int moveEnd = _lines.count() - 1;
+ qreal offset = h;
+ if(!(atTop || atBottom)) {
+ // move top means: moving 0 to end (aka: end + 1)
+ // move top means: moving end + 1 to _lines.count() - 1 (aka: _lines.count() - (end + 1)
+ if(end + 1 < _lines.count() - end - 1) {
+ // move top part
+ moveTop = true;
+ offset = -offset;
+ moveEnd = end;
+ } else {
+ // move bottom part
+ moveStart = end + 1;
+ }
+ ChatLine *line = 0;
+ for(int i = moveStart; i <= moveEnd; i++) {
+ line = _lines.at(i);
+ line->setPos(0, line->pos().y() + offset);
+ }
+ }
+
+ // check if all went right
+ Q_ASSERT(start == 0 || _lines.at(start - 1)->pos().y() + _lines.at(start - 1)->height() == _lines.at(start)->pos().y());
+// if(start != 0) {
+// if(_lines.at(start - 1)->pos().y() + _lines.at(start - 1)->height() != _lines.at(start)->pos().y()) {
+// qDebug() << "lines:" << _lines.count() << "start:" << start << "end:" << end;
+// qDebug() << "line[start - 1]:" << _lines.at(start - 1)->pos().y() << "+" << _lines.at(start - 1)->height() << "=" << _lines.at(start - 1)->pos().y() + _lines.at(start - 1)->height();
+// qDebug() << "line[start]" << _lines.at(start)->pos().y();
+// qDebug() << "needed moving:" << !(atTop || atBottom) << moveTop << moveStart << moveEnd << offset;
+// Q_ASSERT(false)
+// }
+// }
+ Q_ASSERT(end + 1 == _lines.count() || _lines.at(end)->pos().y() + _lines.at(end)->height() == _lines.at(end + 1)->pos().y());
+// if(end + 1 < _lines.count()) {
+// if(_lines.at(end)->pos().y() + _lines.at(end)->height() != _lines.at(end + 1)->pos().y()) {
+// qDebug() << "lines:" << _lines.count() << "start:" << start << "end:" << end;
+// qDebug() << "line[end]:" << _lines.at(end)->pos().y() << "+" << _lines.at(end)->height() << "=" << _lines.at(end)->pos().y() + _lines.at(end)->height();
+// qDebug() << "line[end+1]" << _lines.at(end + 1)->pos().y();
+// qDebug() << "needed moving:" << !(atTop || atBottom) << moveTop << moveStart << moveEnd << offset;
+// Q_ASSERT(false);
+// }
+// }
+
+ if(!atBottom) {
+ if(start < _firstLineRow) {
+ int prevFirstLineRow = _firstLineRow + (end - start + 1);
+ for(int i = end + 1; i < prevFirstLineRow; i++) {
+ _lines.at(i)->show();
+ }
+ }
+ // force new search for first proper line
+ _firstLineRow = -1;
+ }
+ updateSceneRect();
+ if(atBottom || (!atTop && !moveTop)) {
+ emit lastLineChanged(_lines.last(), h);
+ }
+}
+
+void ChatScene::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end) {
+ Q_UNUSED(parent);
+
+ qreal h = 0; // total height of removed items;
+
+ bool atTop = (start == 0);
+ bool atBottom = (end == _lines.count() - 1);
+ bool moveTop = false;
+
+ // remove items from scene
+ QList<ChatLine *>::iterator lineIter = _lines.begin() + start;
+ int lineCount = start;
+ while(lineIter != _lines.end() && lineCount <= end) {
+ h += (*lineIter)->height();
+ delete *lineIter;
+ lineIter = _lines.erase(lineIter);
+ lineCount++;
+ }
+
+ // update rows of remaining chatlines
+ for(int i = start; i < _lines.count(); i++) {
+ _lines.at(i)->setRow(i);
+ }
+
+ // update selection
+ if(_selectionStart >= 0) {
+ int offset = end - start + 1;
+ if(_selectionStart >= start)
+ _selectionStart -= offset;
+ if(_selectionEnd >= start)
+ _selectionEnd -= offset;
+ if(_firstSelectionRow >= start)
+ _firstSelectionRow -= offset;
+ if(_lastSelectionRow >= start)
+ _lastSelectionRow -= offset;
+ }
+
+ // neither removing at bottom or top means we have to move items...
+ if(!(atTop || atBottom)) {
+ qreal offset = h;
+ int moveStart = 0;
+ int moveEnd = _lines.count() - 1;
+ if(start < _lines.count() - start) {
+ // move top part
+ moveTop = true;
+ moveEnd = start - 1;
+ } else {
+ // move bottom part
+ moveStart = start;
+ offset = -offset;
+ }
+ ChatLine *line = 0;
+ for(int i = moveStart; i <= moveEnd; i++) {
+ line = _lines.at(i);
+ line->setPos(0, line->pos().y() + offset);