Method setDataSpan

pj_widgets/src/Timeline.cpp:433–437

Update only the tinted data span (display-ns), keeping the rest of the layout — used to track the band live during a bar drag without a rebuild.

  /// Update only the tinted data span (display-ns), keeping the rest of the
  /// layout — used to track the band live during a bar drag without a rebuild.
  void setDataSpan(qint64 data_min_ns, qint64 data_max_ns) {
    data_min_ns_ = data_min_ns;
    data_max_ns_ = data_max_ns;
    update();
  }

  [[nodiscard]] QRectF boundingRect() const override {
    return QRectF(0, 0, width_px_, kRulerHeight);