2 volta-engraver.cc -- implement Volta_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "engraver.hh"
11 #include "translator-group.hh"
12 #include "volta-spanner.hh"
14 #include "note-column.hh"
16 #include "side-position-interface.hh"
19 Create Volta spanners, by reading repeatCommands property, usually
20 set by Unfolded_repeat_iterator.
22 class Volta_engraver : public Engraver
26 VIRTUAL_COPY_CONS (Translator);
29 virtual void acknowledge_grob (Grob_info);
30 virtual void finalize ();
31 virtual void stop_translation_timestep ();
32 virtual void process_music ();
33 virtual void create_grobs ();
36 Spanner *volta_span_p_;
37 Spanner *end_volta_span_p_;
42 ADD_THIS_TRANSLATOR (Volta_engraver);
44 Volta_engraver::Volta_engraver ()
47 end_volta_span_p_ = 0;
52 Volta_engraver::process_music ()
54 SCM cs = get_property ("repeatCommands");
58 while (gh_pair_p (cs))
62 if (gh_pair_p (c) && gh_car (c) == ly_symbol2scm ("volta")
63 && gh_pair_p (gh_cdr (c)))
65 if (gh_cadr (c) == SCM_BOOL_F)
68 start_str_ = gh_cadr (c);
76 SCM l (get_property ("voltaSpannerDuration"));
77 Moment now = now_mom ();
79 bool early_stop = unsmob_moment (l)
80 && *unsmob_moment (l) <= now - started_mom_;
82 end = end || early_stop;
86 if (end && !volta_span_p_)
88 warning (_ ("No volta spanner to end")); // fixme: be more verbose.
92 end_volta_span_p_ = volta_span_p_;
96 maybe do typeset_grob () directly?
99 if (!gh_string_p (start_str_))
100 end_volta_span_p_->set_grob_property ("last-volta", SCM_BOOL_T);
103 if (gh_string_p (start_str_) && volta_span_p_)
105 warning (_ ("Already have a volta spanner. Stopping that one prematurely."));
107 if (end_volta_span_p_)
109 warning (_ ("Also have a stopped spanner. Giving up."));
113 end_volta_span_p_ = volta_span_p_;
119 this could just as well be done in process_music (), but what the hack.
122 Volta_engraver::create_grobs ()
124 if (!volta_span_p_ && gh_string_p (start_str_))
126 started_mom_ = now_mom () ;
128 volta_span_p_ = new Spanner (get_property ("VoltaBracket"));
129 Volta_spanner::set_interface (volta_span_p_);
130 announce_grob (volta_span_p_,0);
131 volta_span_p_->set_grob_property ("text", start_str_);
136 Volta_engraver::acknowledge_grob (Grob_info i)
138 if (Item* item = dynamic_cast<Item*> (i.elem_l_))
140 if (Note_column::has_interface (item))
143 Volta_spanner::add_column (volta_span_p_,item);
144 if (end_volta_span_p_)
145 Volta_spanner::add_column (end_volta_span_p_,item);
147 if (Bar::has_interface (item))
150 Volta_spanner::add_bar (volta_span_p_, item);
151 if (end_volta_span_p_)
152 Volta_spanner::add_bar (end_volta_span_p_ , item);
158 Volta_engraver::finalize ()
162 typeset_grob (volta_span_p_);
164 if (end_volta_span_p_)
166 typeset_grob (end_volta_span_p_);
173 Volta_engraver::stop_translation_timestep ()
175 if (end_volta_span_p_)
177 Side_position_interface::add_staff_support (end_volta_span_p_);
179 typeset_grob (end_volta_span_p_);
180 end_volta_span_p_ =0;
185 TODO: should attach volta to paper-column if no bar is found.