2 key-engraver.cc -- implement Key_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
13 #include "bar-line.hh"
14 #include "staff-symbol-referencer.hh"
15 #include "translator-group.hh"
16 #include "engraver.hh"
18 #include "protected-scm.hh"
22 TODO: The representation of key sigs is all fucked.
26 Make the key signature.
28 class Key_engraver : public Engraver
30 void create_key (bool);
31 void read_ev (Key_change_ev const * r);
32 Key_change_ev * key_ev_;
36 TRANSLATOR_DECLARATIONS(Key_engraver);
39 virtual void initialize ();
40 virtual void finalize ();
41 virtual bool try_music (Music *ev);
42 virtual void stop_translation_timestep ();
43 virtual void start_translation_timestep ();
44 virtual void process_music ();
45 virtual void acknowledge_grob (Grob_info);
50 Key_engraver::finalize ()
55 Key_engraver::Key_engraver ()
63 Key_engraver::create_key (bool def)
67 item_ = make_item ("KeySignature");
69 item_->set_grob_property ("c0-position",
70 get_property ("centralCPosition"));
72 // todo: put this in basic props.
73 item_->set_grob_property ("old-accidentals", get_property ("lastKeySignature"));
74 item_->set_grob_property ("new-accidentals", get_property ("keySignature"));
76 announce_grob(item_, key_ev_ ? key_ev_->self_scm() : SCM_EOL);
81 SCM vis = get_property ("explicitKeySignatureVisibility");
82 if (gh_procedure_p (vis))
83 item_->set_grob_property ("break-visibility",vis);
89 Key_engraver::try_music (Music * ev)
91 // if (Key_change_ev *kc = dynamic_cast <Key_change_ev *> (ev))
92 if (ev->is_mus_type ("key-change-event"))
97 do this only once, just to be on the safe side.
99 key_ev_ = dynamic_cast<Key_change_ev*> (ev); // UGH.
110 Key_engraver::acknowledge_grob (Grob_info info)
112 if (Clef::has_interface (info.grob_))
114 SCM c = get_property ("createKeyOnClefChange");
120 else if (Bar_line::has_interface (info.grob_)
121 && gh_pair_p (get_property ("keySignature")))
129 Key_engraver::process_music ()
132 get_property ("lastKeySignature") != get_property ("keySignature"))
138 Key_engraver::stop_translation_timestep ()
142 typeset_grob (item_);
149 Key_engraver::read_ev (Key_change_ev const * r)
151 SCM p = r->get_mus_property ("pitch-alist");
155 SCM n = scm_list_copy (p);
157 for (SCM s = get_property ("keyAccidentalOrder");
158 gh_pair_p (s); s = ly_cdr (s))
160 if (gh_pair_p (scm_member (ly_car (s), n)))
162 accs = gh_cons (ly_car (s), accs);
163 n = scm_delete_x (ly_car (s), n);
167 for (SCM s = n ; gh_pair_p (s); s = ly_cdr (s))
168 if (gh_scm2int (ly_cdar (s)))
169 accs = gh_cons (ly_car (s), accs);
171 daddy_trans_->set_property ("keySignature", accs);
172 daddy_trans_->set_property ("tonic" ,
173 r->get_mus_property ("tonic"));
178 Key_engraver::start_translation_timestep ()
181 daddy_trans_->set_property ("lastKeySignature", get_property ("keySignature"));
186 Key_engraver::initialize ()
188 daddy_trans_->set_property ("keySignature", SCM_EOL);
189 daddy_trans_->set_property ("lastKeySignature", SCM_EOL);
192 daddy_trans_->set_property ("tonic", p.smobbed_copy ());
197 ENTER_DESCRIPTION(Key_engraver,
199 /* creats*/ "KeySignature",
200 /* accepts */ "key-change-event",
201 /* acks */ "bar-line-interface clef-interface",
202 /* reads */ "keySignature lastKeySignature explicitKeySignatureVisibility createKeyOnClefChange keyAccidentalOrder keySignature",
203 /* write */ "lastKeySignature tonic keySignature");