2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 1998--2010 Jan Nieuwenhuizen <janneke@gnu.org>
6 LilyPond is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 LilyPond is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
23 #include "engraver.hh"
26 #include "duration.hh"
27 #include "grob-array.hh"
29 #include "stream-event.hh"
30 #include "text-interface.hh"
31 #include "time-signature.hh"
33 #include "translator.icc"
35 class Metronome_mark_engraver : public Engraver
38 TRANSLATOR_DECLARATIONS (Metronome_mark_engraver);
48 DECLARE_ACKNOWLEDGER (break_aligned);
51 virtual void derived_mark () const;
52 void stop_translation_timestep ();
53 void process_music ();
56 Metronome_mark_engraver::Metronome_mark_engraver ()
60 last_duration_ = SCM_EOL;
61 last_count_ = SCM_EOL;
66 Metronome_mark_engraver::derived_mark () const
68 scm_gc_mark (last_count_);
69 scm_gc_mark (last_duration_);
70 scm_gc_mark (last_text_);
74 Metronome_mark_engraver::acknowledge_break_aligned (Grob_info inf)
76 Grob *s = inf.grob ();
77 if (text_ && Time_signature::has_interface (s))
82 Metronome_mark_engraver::stop_translation_timestep ()
89 Gardner Read "Music Notation", p.278
91 Align the metronome mark over the time signature (or the
92 first notational element of the measure if no time
93 signature is present in that measure).
95 Grob *mc = unsmob_grob (get_property ("currentMusicalColumn"));
96 text_->set_parent (mc, X_AXIS);
98 text_->set_object ("side-support-elements",
99 grob_list_to_grob_array (get_property ("stavesFound")));
106 Metronome_mark_engraver::process_music ()
108 SCM count = get_property ("tempoUnitCount");
109 SCM duration = get_property ("tempoUnitDuration");
110 SCM text = get_property ("tempoText");
112 if ( ( (unsmob_duration (duration) && scm_is_number (count))
113 || Text_interface::is_markup (text) )
114 && !(ly_is_equal (count, last_count_)
115 && ly_is_equal (duration, last_duration_)
116 && ly_is_equal (text, last_text_)))
118 text_ = make_item ("MetronomeMark", SCM_EOL);
120 SCM proc = get_property ("metronomeMarkFormatter");
121 SCM result = scm_call_4 (proc,
125 context ()->self_scm ());
127 text_->set_property ("text", result);
130 last_duration_ = duration;
137 ADD_ACKNOWLEDGER (Metronome_mark_engraver, break_aligned);
139 ADD_TRANSLATOR (Metronome_mark_engraver,
141 "Engrave metronome marking. This delegates the formatting"
142 " work to the function in the @code{metronomeMarkFormatter}"
143 " property. The mark is put over all staves. The staves are"
144 " taken from the @code{stavesFound} property, which is"
145 " maintained by @ref{Staff_collecting_engraver}.",
152 "metronomeMarkFormatter "