_singleBufferScene(false),
_selectingItem(0),
_selectionStart(-1),
- _isSelecting(false)
+ _isSelecting(false),
+ _lastBacklogSize(0)
{
MessageFilter *filter = qobject_cast<MessageFilter*>(model);
if(filter) {
connect(this, SIGNAL(sceneRectChanged(const QRectF &)), this, SLOT(rectChanged(const QRectF &)));
- connect(model, SIGNAL(rowsInserted(const QModelIndex &, int, int)), this, SLOT(rowsInserted(const QModelIndex &, int, int)));
- connect(model, SIGNAL(modelAboutToBeReset()), this, SLOT(modelReset()));
+ connect(model, SIGNAL(rowsInserted(const QModelIndex &, int, int)),
+ this, SLOT(rowsInserted(const QModelIndex &, int, int)));
+ connect(model, SIGNAL(rowsAboutToBeRemoved(const QModelIndex &, int, int)),
+ this, SLOT(rowsAboutToBeRemoved(const QModelIndex &, int, int)));
+
for(int i = 0; i < model->rowCount(); i++) {
ChatLine *line = new ChatLine(i, model);
_lines.append(line);
}
ChatScene::~ChatScene() {
-
}
void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
// TODO bulk inserts, iterators
qreal h = 0;
qreal y = 0;
- if(_width && start > 0) y = _lines.value(start - 1)->y() + _lines.value(start - 1)->height();
+ if(_width && start > 0)
+ y = _lines.value(start - 1)->y() + _lines.value(start - 1)->height();
+
for(int i = start; i <= end; i++) {
ChatLine *line = new ChatLine(i, model());
_lines.insert(i, line);
if(h > 0) {
_height += h;
for(int i = end+1; i < _lines.count(); i++) {
- _lines.value(i)->moveBy(0, h);
+ _lines.at(i)->moveBy(0, h);
}
setSceneRect(QRectF(0, 0, _width, _height));
emit heightChanged(_height);
}
}
-void ChatScene::modelReset() {
- foreach(ChatLine *line, _lines) {
- removeItem(line);
- delete line;
+void ChatScene::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end) {
+ Q_UNUSED(parent);
+
+ qreal h = 0; // total height of removed items;
+
+ // 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;
+ }
+
+ // reposition remaining chatlines
+ if(h > 0) {
+ Q_ASSERT(_height >= h);
+ _height -= h;
+ for(int i = start; i < _lines.count(); i++) {
+ _lines.at(i)->moveBy(0, -h);
+ }
+ setSceneRect(QRectF(0, 0, _width, _height));
+ emit heightChanged(_height);
}
- _lines.clear();
- setSceneRect(QRectF(0, 0, _width, 0));
- emit heightChanged(0);
}
void ChatScene::setWidth(qreal w) {