+void ChatView::lastLineChanged(QGraphicsItem* chatLine, qreal offset)
+{
+ Q_UNUSED(chatLine)
+ // disabled until further testing/discussion
+ // if(!scene()->isScrollingAllowed())
+ // return;
+
+ QAbstractSlider* vbar = verticalScrollBar();
+ Q_ASSERT(vbar);
+ if (vbar->maximum() - vbar->value() <= (offset + 5) * _currentScaleFactor) { // 5px grace area
+ vbar->setValue(vbar->maximum());
+ }
+}
+
+void ChatView::verticalScrollbarChanged(int newPos)
+{
+ QAbstractSlider* vbar = verticalScrollBar();
+ Q_ASSERT(vbar);
+
+ // check for backlog request
+ if (newPos < _lastScrollbarPos) {
+ int relativePos = 100;
+ if (vbar->maximum() - vbar->minimum() != 0)
+ relativePos = (newPos - vbar->minimum()) * 100 / (vbar->maximum() - vbar->minimum());
+
+ if (relativePos < 20) {
+ scene()->requestBacklog();
+ }
+ }
+ _lastScrollbarPos = newPos;
+
+ // FIXME: Fugly workaround for the ChatView scrolling up 1px on buffer switch
+ if (vbar->maximum() - newPos <= 2)
+ vbar->setValue(vbar->maximum());
+}
+
+MsgId ChatView::lastMsgId() const
+{
+ if (!scene())
+ return {};
+
+ QAbstractItemModel* model = scene()->model();
+ if (!model || model->rowCount() == 0)
+ return {};
+
+ 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 {};
+}
+
+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)) {
+ auto* 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).values();
+ std::sort(result.begin(), result.end(), chatLinePtrLessThan);
+ return result;
+}
+
+ChatLine* ChatView::lastVisibleChatLine(bool ignoreDayChange) const
+{
+ if (!scene())
+ return nullptr;
+
+ QAbstractItemModel* model = scene()->model();
+ if (!model || model->rowCount() == 0)
+ return nullptr;
+
+ int row = -1;
+
+ QSet<ChatLine*> visibleLines = visibleChatLines(Qt::ContainsItemBoundingRect);
+ foreach (ChatLine* line, visibleLines) {
+ if (line->row() > row && (ignoreDayChange ? line->msgType() != Message::DayChange : true))
+ row = line->row();
+ }
+
+ if (row >= 0)
+ return scene()->chatLine(row);
+
+ return nullptr;
+}
+
+void ChatView::setMarkerLineVisible(bool visible)
+{
+ scene()->setMarkerLineVisible(visible);
+}
+
+void ChatView::setMarkerLine(MsgId msgId)
+{
+ if (!scene()->isSingleBufferScene())
+ return;
+
+ BufferId bufId = scene()->singleBufferId();
+ Client::setMarkerLine(bufId, msgId);
+}
+
+void ChatView::markerLineSet(BufferId buffer, MsgId msgId)
+{
+ if (!scene()->isSingleBufferScene() || scene()->singleBufferId() != buffer)
+ return;
+
+ scene()->setMarkerLine(msgId);
+ scene()->setMarkerLineVisible(true);
+}
+
+void ChatView::jumpToMarkerLine(bool requestBacklog)
+{
+ scene()->jumpToMarkerLine(requestBacklog);
+}
+
+void ChatView::addActionsToMenu(QMenu* menu, const QPointF& pos)
+{
+ // zoom actions
+ auto* bw = qobject_cast<BufferWidget*>(bufferContainer());
+ if (bw) {
+ bw->addActionsToMenu(menu, pos);
+ menu->addSeparator();
+ }
+}
+
+void ChatView::zoomIn()
+{