-Beam_engraver::acknowledge_element (Score_element_info info)
-{
- if (beam_p_)
- {
- Stem* stem_l = dynamic_cast<Stem *> (info.elem_l_);
- if (!stem_l)
- return;
-
-
- Rhythmic_req *rhythmic_req = dynamic_cast <Rhythmic_req *> (info.req_l_);
- if (!rhythmic_req)
- {
- String s=_("Stem must have Rhythmic structure.");
- if (info.req_l_)
- info.req_l_->warning(s);
- else
- ::warning (s);
-
- return;
- }
-
-
- if (rhythmic_req->duration_.durlog_i_<= 2)
- {
- rhythmic_req->warning (_ ("stem doesn't fit in beam"));
- reqs_drul_[LEFT]->warning (_("beam was started here"));
- return;
- }
-
- /*
- TODO: do something sensible if it doesn't fit in the beam.
- */
- Moment start = get_staff_info().time_C_->whole_in_measure_;
-
- if (!grouping_p_->child_fit_b (start))
- {
- String s (_("please fix me") + ": "
- + _f ("stem at %s doesn't fit in beam", now_moment ().str ()));
-
- if (info.req_l_)
- info.req_l_->warning(s);
- else
- warning (s);
- }
- else
- {
- grouping_p_->add_child (start, rhythmic_req->duration ());
- stem_l->flag_i_ = rhythmic_req->duration_.durlog_i_;
- beam_p_->add_stem (stem_l);
- }
- }
-}
-
-
-
-ADD_THIS_TRANSLATOR(Beam_engraver);
+Beam_engraver::acknowledge_rest (Grob_info info)
+{
+ if (beam_
+ && !scm_is_number (info.grob ()->get_property_data ("staff-position")))
+ chain_offset_callback (info.grob (),
+ Beam::rest_collision_callback_proc, Y_AXIS);
+}
+
+void
+Beam_engraver::acknowledge_stem (Grob_info info)
+{
+ if (!beam_)
+ return;
+
+ Moment now = now_mom ();
+ if (!valid_start_point ())
+ return;
+
+ Item *stem = dynamic_cast<Item *> (info.grob ());
+ if (Stem::get_beam (stem))
+ return;
+
+ Stream_event *ev = info.ultimate_event_cause ();
+ if (!ev->in_event_class ("rhythmic-event"))
+ {
+ info.grob ()->warning (_ ("stem must have Rhythmic structure"));
+ return;
+ }
+
+ last_stem_added_at_ = now;
+
+ Duration *stem_duration = unsmob_duration (ev->get_property ("duration"));
+ int durlog = stem_duration->duration_log ();
+ //int durlog = unsmob_duration (ev->get_property ("duration"))->duration_log ();
+ if (durlog <= 2)
+ {
+ ev->origin ()->warning (_ ("stem does not fit in beam"));
+ prev_start_ev_->origin ()->warning (_ ("beam was started here"));
+ /*
+ don't return, since
+
+ [r4 c8] can just as well be modern notation.
+ */
+ }
+
+ if (forced_direction_)
+ set_grob_direction (stem, forced_direction_);
+
+ stem->set_property ("duration-log", scm_from_int (durlog));
+ Moment stem_location = now - beam_start_mom_ + beam_start_location_;
+ beam_info_->add_stem (stem_location,
+ max (durlog - 2, 0),
+ Stem::is_invisible (stem),
+ stem_duration->factor (),
+ (stem->get_property ("tuplet-start") == SCM_BOOL_T));
+ Beam::add_stem (beam_, stem);
+}
+
+ADD_ACKNOWLEDGER (Beam_engraver, stem);
+ADD_ACKNOWLEDGER (Beam_engraver, rest);
+
+ADD_TRANSLATOR (Beam_engraver,
+ /* doc */
+ "Handle @code{Beam} events by engraving beams. If omitted,"
+ " then notes are printed with flags instead of beams.",
+
+ /* create */
+ "Beam ",
+
+ /* read */
+ "baseMoment "
+ "beamMelismaBusy "
+ "beatStructure "
+ "subdivideBeams ",
+
+ /* write */
+ "forbidBreak"
+ );
+
+class Grace_beam_engraver : public Beam_engraver
+{
+public:
+ TRANSLATOR_DECLARATIONS (Grace_beam_engraver);
+
+ DECLARE_TRANSLATOR_LISTENER (beam);
+
+protected:
+ virtual bool valid_start_point ();
+ virtual bool valid_end_point ();
+};
+
+Grace_beam_engraver::Grace_beam_engraver ()
+{
+}
+
+bool
+Grace_beam_engraver::valid_start_point ()
+{
+ Moment n = now_mom ();
+
+ return n.grace_part_ != Rational (0);
+}
+
+bool
+Grace_beam_engraver::valid_end_point ()
+{
+ return beam_ && valid_start_point ();
+}
+
+/*
+ Ugh, C&P code.
+ */
+IMPLEMENT_TRANSLATOR_LISTENER (Grace_beam_engraver, beam);
+void
+Grace_beam_engraver::listen_beam (Stream_event *ev)
+{
+ Direction d = to_dir (ev->get_property ("span-direction"));
+
+ if (d == START && valid_start_point ())
+ start_ev_ = ev;
+ else if (d == STOP && valid_end_point ())
+ stop_ev_ = ev;
+}
+
+ADD_ACKNOWLEDGER (Grace_beam_engraver, stem);
+ADD_ACKNOWLEDGER (Grace_beam_engraver, rest);
+
+ADD_TRANSLATOR (Grace_beam_engraver,
+ /* doc */
+ "Handle @code{Beam} events by engraving beams. If omitted,"
+ " then notes are printed with flags instead of beams. Only"
+ " engraves beams when we are at grace points in time.",
+
+ /* create */
+ "Beam ",
+
+ /* read */
+ "baseMoment "
+ "beamMelismaBusy "
+ "beatStructure "
+ "subdivideBeams ",
+
+ /* write */
+ ""
+ );
+