+void
+Staff_symbol_engraver::start_spanner ()
+{
+ if (!span_)
+ {
+ span_ = make_spanner ("StaffSymbol", SCM_EOL);
+ span_->set_bound (LEFT,
+ unsmob_grob (get_property ("currentCommandColumn")));
+ }
+}
+
+void
+Staff_symbol_engraver::stop_spanner ()
+{
+ if (!finished_span_)
+ return;
+
+ if (!finished_span_->get_bound (RIGHT))
+ finished_span_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
+
+ announce_end_grob (finished_span_,
+ span_events_[STOP]
+ ? span_events_[STOP]->self_scm ()
+ : SCM_EOL);
+
+ finished_span_ = 0;
+}
+
+void
+Staff_symbol_engraver::stop_translation_timestep ()
+{
+ if ((span_events_[START] || first_start_)
+ && span_)
+ first_start_ = false;
+
+ span_events_.set (0, 0);
+ stop_spanner ();