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"
17 #include "staff-symbol.hh"
20 Create Volta spanners, by reading repeatCommands property, usually
21 set by Unfolded_repeat_iterator.
23 class Volta_engraver : public Engraver
26 TRANSLATOR_DECLARATIONS(Volta_engraver);
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 Volta_engraver::Volta_engraver ()
46 end_volta_span_p_ = 0;
51 Volta_engraver::process_music ()
53 if (unsmob_grob (staff_))
56 TODO: this does weird things when you open a piece with a
60 SCM staffs = get_property ("stavesFound");
63 only put a volta on the top staff.
65 May be this is a bit convoluted, and we should have a single
66 volta engraver in score context or somesuch.
69 if (ly_car (scm_last_pair (staffs)) != staff_)
74 SCM cs = get_property ("repeatCommands");
78 while (gh_pair_p (cs))
82 if (gh_pair_p (c) && ly_car (c) == ly_symbol2scm ("volta")
83 && gh_pair_p (ly_cdr (c)))
85 if (ly_cadr (c) == SCM_BOOL_F)
88 start_str_ = ly_cadr (c);
96 SCM l (get_property ("voltaSpannerDuration"));
97 Moment now = now_mom ();
99 bool early_stop = unsmob_moment (l)
100 && *unsmob_moment (l) <= now - started_mom_;
102 end = end || early_stop;
106 if (end && !volta_span_p_)
108 warning (_ ("No volta spanner to end")); // fixme: be more verbose.
112 end_volta_span_p_ = volta_span_p_;
116 maybe do typeset_grob () directly?
119 if (!gh_string_p (start_str_))
120 end_volta_span_p_->set_grob_property ("last-volta", SCM_BOOL_T);
123 if (gh_string_p (start_str_) && volta_span_p_)
125 warning (_ ("Already have a volta spanner. Stopping that one prematurely."));
127 if (end_volta_span_p_)
129 warning (_ ("Also have a stopped spanner. Giving up."));
133 end_volta_span_p_ = volta_span_p_;
139 this could just as well be done in process_music (), but what the hack.
142 Volta_engraver::create_grobs ()
144 if (!volta_span_p_ && gh_string_p (start_str_))
146 started_mom_ = now_mom () ;
148 volta_span_p_ = new Spanner (get_property ("VoltaBracket"));
149 Volta_spanner::set_interface (volta_span_p_);
150 announce_grob (volta_span_p_,0);
151 volta_span_p_->set_grob_property ("text", start_str_);
156 Volta_engraver::acknowledge_grob (Grob_info i)
158 if (Item* item = dynamic_cast<Item*> (i.grob_l_))
160 if (Note_column::has_interface (item))
163 Volta_spanner::add_column (volta_span_p_,item);
165 if (Bar::has_interface (item))
168 Volta_spanner::add_bar (volta_span_p_, item);
169 if (end_volta_span_p_)
170 Volta_spanner::add_bar (end_volta_span_p_ , item);
173 else if (Staff_symbol::has_interface (i.grob_l_))
176 We only want to know about a single staff: then we add to the
178 if (staff_ != SCM_EOL)
179 staff_ = SCM_UNDEFINED;
181 if (staff_ != SCM_UNDEFINED)
182 staff_ = i.grob_l_->self_scm();
187 Volta_engraver::finalize ()
191 typeset_grob (volta_span_p_);
193 if (end_volta_span_p_)
195 typeset_grob (end_volta_span_p_);
202 Volta_engraver::stop_translation_timestep ()
204 if (end_volta_span_p_)
206 typeset_grob (end_volta_span_p_);
207 end_volta_span_p_ =0;
212 TODO: should attach volta to paper-column if no bar is found.
215 ENTER_DESCRIPTION(Volta_engraver,
216 /* descr */ "Make volta brackets",
217 /* creats*/ "VoltaBracket",
218 /* acks */ "bar-line-interface staff-symbol-interface note-column-interface",
219 /* reads */ "repeatCommands voltaSpannerDuration stavesFound",