2 key-engraver.cc -- implement Key_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "bar-line.hh"
11 #include "staff-symbol-referencer.hh"
13 #include "engraver.hh"
14 #include "protected-scm.hh"
19 TODO: The representation of key sigs is all fucked.
23 Make the key signature.
25 class Key_engraver : public Engraver
27 void create_key (bool);
28 void read_ev (Music const *r);
34 TRANSLATOR_DECLARATIONS (Key_engraver);
37 virtual void initialize ();
38 virtual void finalize ();
39 virtual bool try_music (Music *ev);
40 PRECOMPUTED_VIRTUAL void stop_translation_timestep ();
41 PRECOMPUTED_VIRTUAL void process_music ();
42 virtual void acknowledge_grob (Grob_info);
46 Key_engraver::finalize ()
50 Key_engraver::Key_engraver ()
58 Key_engraver::create_key (bool def)
62 item_ = make_item ("KeySignature", key_ev_ ? key_ev_->self_scm () : SCM_EOL);
64 item_->set_property ("c0-position",
65 get_property ("middleCPosition"));
67 SCM last = get_property ("lastKeySignature");
68 SCM key = get_property ("keySignature");
69 if (to_boolean (get_property ("printKeyCancellation"))
70 && !scm_is_eq (last, key))
72 cancellation_ = make_item ("KeyCancellation", key_ev_ ? key_ev_->self_scm () : SCM_EOL);
73 cancellation_->set_property ("old-accidentals", last);
74 cancellation_->set_property ("c0-position",
75 get_property ("middleCPosition"));
77 item_->set_property ("new-accidentals", key);
82 SCM vis = get_property ("explicitKeySignatureVisibility");
83 if (ly_is_procedure (vis))
84 item_->set_property ("break-visibility", vis);
89 Key_engraver::try_music (Music *ev)
91 if (ev->is_mus_type ("key-change-event"))
93 /* do this only once, just to be on the safe side. */
105 Key_engraver::acknowledge_grob (Grob_info info)
107 if (Clef::has_interface (info.grob ()))
109 SCM c = get_property ("createKeyOnClefChange");
115 else if (Bar_line::has_interface (info.grob ())
116 && scm_is_pair (get_property ("keySignature")))
123 Key_engraver::process_music ()
126 || get_property ("lastKeySignature") != get_property ("keySignature"))
131 Key_engraver::stop_translation_timestep ()
134 context ()->set_property ("lastKeySignature", get_property ("keySignature"));
140 Key_engraver::read_ev (Music const *r)
142 SCM p = r->get_property ("pitch-alist");
143 if (!scm_is_pair (p))
146 SCM n = scm_list_copy (p);
148 for (SCM s = get_property ("keyAccidentalOrder");
149 scm_is_pair (s); s = scm_cdr (s))
151 if (scm_is_pair (scm_member (scm_car (s), n)))
153 accs = scm_cons (scm_car (s), accs);
154 n = scm_delete_x (scm_car (s), n);
158 for (SCM s = n; scm_is_pair (s); s = scm_cdr (s))
159 if (scm_to_int (scm_cdar (s)))
160 accs = scm_cons (scm_car (s), accs);
162 context ()->set_property ("keySignature", accs);
163 context ()->set_property ("tonic",
164 r->get_property ("tonic"));
168 Key_engraver::initialize ()
170 context ()->set_property ("keySignature", SCM_EOL);
171 context ()->set_property ("lastKeySignature", SCM_EOL);
174 context ()->set_property ("tonic", p.smobbed_copy ());
177 #include "translator.icc"
179 ADD_TRANSLATOR (Key_engraver,
181 /* creats*/ "KeySignature",
182 /* accepts */ "key-change-event",
183 /* acks */ "bar-line-interface clef-interface",
184 /* reads */ "keySignature printKeyCancellation lastKeySignature explicitKeySignatureVisibility createKeyOnClefChange keyAccidentalOrder keySignature",
185 /* write */ "lastKeySignature tonic keySignature");