+ return model->index(model->rowCount() - 1, 0).data(MessageModel::MsgIdRole).value<MsgId>();
+}
+
+MsgId ChatView::lastVisibleMsgId() const {
+ ChatLine *line = lastVisibleChatLine();
+
+ if(line)
+ return line->msgId();
+
+ return MsgId();
+}
+
+bool chatLinePtrLessThan(ChatLine *one, ChatLine *other) {
+ return one->row() < other->row();
+}
+
+// TODO: figure out if it's cheaper to use a cached list (that we'd need to keep updated)
+QSet<ChatLine *> ChatView::visibleChatLines(Qt::ItemSelectionMode mode) const {
+ QSet<ChatLine *> result;
+ foreach(QGraphicsItem *item, items(viewport()->rect().adjusted(-1, -1, 1, 1), mode)) {
+ ChatLine *line = qgraphicsitem_cast<ChatLine *>(item);
+ if(line)
+ result.insert(line);
+ }
+ return result;
+}
+
+QList<ChatLine *> ChatView::visibleChatLinesSorted(Qt::ItemSelectionMode mode) const {
+ QList<ChatLine *> result = visibleChatLines(mode).toList();
+ qSort(result.begin(), result.end(), chatLinePtrLessThan);
+ return result;
+}
+
+ChatLine *ChatView::lastVisibleChatLine() const {
+ if(!scene())
+ return 0;
+
+ QAbstractItemModel *model = scene()->model();
+ if(!model || model->rowCount() == 0)
+ return 0;
+
+ int row = -1;
+
+ QSet<ChatLine *> visibleLines = visibleChatLines(Qt::ContainsItemBoundingRect);
+ foreach(ChatLine *line, visibleLines) {
+ if(line->row() > row)
+ row = line->row();
+ }
+
+ if(row >= 0)
+ return scene()->chatLine(row);
+
+ return 0;
+}
+
+void ChatView::setMarkerLineVisible(bool visible) {
+ if(visible != _markerLineVisible) {
+ _markerLineVisible = visible;
+ }
+}
+
+void ChatView::setMarkedLine(ChatLine *line) {
+ if(_markedLine == line)
+ return;
+
+ if(!scene()->isSingleBufferScene())
+ return;
+
+ if(line) {
+ BufferId bufId = scene()->singleBufferId();
+ Client::setMarkerLine(bufId, line->msgId());
+ }
+}
+
+void ChatView::markerLineSet(BufferId buffer, MsgId msg) {
+ if(!scene()->isSingleBufferScene() || scene()->singleBufferId() != buffer)
+ return;
+
+ ChatLine *newLine = scene()->chatLine(msg);
+ if(_markedLine == newLine)
+ return;
+
+ ChatLine *oldLine = _markedLine;
+ _markedLine = newLine;
+
+ if(oldLine)
+ oldLine->update();
+
+ if(newLine) {
+ setMarkerLineVisible(true);
+ newLine->update();
+ }