(event->type() == QEvent::ToolTip)) {
auto sec = pv::util::Timestamp(sample_count_.value()) / sample_rate_.value();
QHelpEvent *help_event = static_cast<QHelpEvent*>(event);
(event->type() == QEvent::ToolTip)) {
auto sec = pv::util::Timestamp(sample_count_.value()) / sample_rate_.value();
QHelpEvent *help_event = static_cast<QHelpEvent*>(event);