2 custos-engraver.cc -- implement Custos_engraver
4 source file of the GNU LilyPond music typesetter
6 (C) 2000 Juergen Reuter <reuter@ipd.uka.de>,
8 Han-Wen Nienhuys <hanwen@cs.uu.nl>
12 #include "engraver.hh"
13 #include "bar-line.hh"
15 #include "note-head.hh"
16 #include "staff-symbol-referencer.hh"
21 * This class implements an engraver for custos symbols.
23 * FIXME: note heads inside of ligatures (i.e. ligature heads) are
24 * sometimes not recognized by this engraver. --jr
26 class Custos_engraver : public Engraver
29 TRANSLATOR_DECLARATIONS( Custos_engraver);
30 virtual void start_translation_timestep ();
31 virtual void acknowledge_grob (Grob_info);
32 virtual void process_acknowledged_grobs ();
33 virtual void stop_translation_timestep ();
34 virtual void finalize ();
38 Item * create_custos ();
39 bool custos_permitted;
40 Link_array<Grob> custodes_;
41 Array<Pitch> pitches_;
44 Custos_engraver::Custos_engraver ()
46 custos_permitted = false;
51 Custos_engraver::stop_translation_timestep ()
54 delay typeset until we're at the next moment, so we can silence custodes at the end of the piece.
59 Custos_engraver::start_translation_timestep ()
61 for (int i = custodes_.size (); i--;)
63 typeset_grob (custodes_[i]);
68 custos_permitted = false;
73 Custos_engraver::acknowledge_grob (Grob_info info)
75 Item *item = dynamic_cast <Item *> (info.grob_);
78 Music * m = info.music_cause();
79 if (Bar_line::has_interface (info.grob_))
80 custos_permitted = true;
81 else if (Note_head::has_interface (info.grob_)
83 && m->is_mus_type ("note-event"))
87 ideally, we'd do custos->set_parent (Y_AXIS, notehead),
88 but since the note head lives on the other system, we can't
90 So we copy the position from the note head pitch. We
91 don't look at the staff-position, since we can't be sure
92 whether Clef_engraver already applied a vertical shift.
94 pitches_.push (*unsmob_pitch (m->get_mus_property ("pitch")));
100 Custos_engraver::process_acknowledged_grobs ()
102 if (gh_string_p (get_property ("whichBar")))
103 custos_permitted = true;
105 if (custos_permitted)
107 for (int i = pitches_.size (); i--;)
109 Item *c = create_custos ();
111 int p = pitches_[i].steps ();
112 SCM c0 = get_property ("centralCPosition");
113 if (gh_number_p (c0))
114 p += gh_scm2int (c0);
117 c->set_grob_property ("staff-position",
127 Custos_engraver::create_custos ()
129 SCM basicProperties = get_property ("Custos");
130 Item* custos = new Item (basicProperties);
132 announce_grob(custos, SCM_EOL);
133 custodes_.push (custos);
139 Custos_engraver::finalize ()
141 for (int i = custodes_.size (); i--;)
143 custodes_[i]->suicide ();
144 typeset_grob (custodes_[i]);
151 ENTER_DESCRIPTION(Custos_engraver,
153 /* creats*/ "Custos",
155 /* acks */ "bar-line-interface note-head-interface",