pv::widgets::SweepTimingWidget _sample_count;
pv::widgets::SweepTimingWidget _sample_rate;
bool _updating_sample_rate;
bool _updating_sample_count;
pv::widgets::SweepTimingWidget _sample_count;
pv::widgets::SweepTimingWidget _sample_rate;
bool _updating_sample_rate;
bool _updating_sample_count;