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"
32 #include "translator.icc"
34 class Metronome_mark_engraver : public Engraver
37 TRANSLATOR_DECLARATIONS (Metronome_mark_engraver);
47 DECLARE_ACKNOWLEDGER (break_aligned);
48 DECLARE_ACKNOWLEDGER (grob);
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 info)
76 Grob *g = info.grob ();
79 && (g->get_property_data ("break-align-symbol")
80 == text_->get_property_data ("break-align-symbol")))
83 text_->set_parent (g, X_AXIS);
88 Metronome_mark_engraver::acknowledge_grob (Grob_info info)
90 Grob *g = info.grob ();
94 && scm_member (g->get_property_data ("break-align-symbol"),
95 text_->get_property_data ("break-align-symbols"))
98 text_->set_parent (g, X_AXIS);
103 Metronome_mark_engraver::stop_translation_timestep ()
110 Gardner Read "Music Notation", p.278
112 Align the metronome mark over the time signature (or the
113 first notational element of the measure if no time
114 signature is present in that measure).
116 if (Grob *mc = unsmob_grob (get_property ("currentMusicalColumn")))
117 text_->set_parent (mc, X_AXIS);
118 else if (Grob *cc = unsmob_grob (get_property ("currentCommandColumn")))
119 text_->set_parent (cc, X_AXIS);
121 text_->set_object ("side-support-elements",
122 grob_list_to_grob_array (get_property ("stavesFound")));
129 Metronome_mark_engraver::process_music ()
131 SCM count = get_property ("tempoUnitCount");
132 SCM duration = get_property ("tempoUnitDuration");
133 SCM text = get_property ("tempoText");
135 if ( ( (unsmob_duration (duration) && scm_is_number (count))
136 || Text_interface::is_markup (text) )
137 && !(ly_is_equal (count, last_count_)
138 && ly_is_equal (duration, last_duration_)
139 && ly_is_equal (text, last_text_)))
141 text_ = make_item ("MetronomeMark", SCM_EOL);
143 SCM proc = get_property ("metronomeMarkFormatter");
144 SCM result = scm_call_4 (proc,
148 context ()->self_scm ());
150 text_->set_property ("text", result);
153 last_duration_ = duration;
160 ADD_ACKNOWLEDGER (Metronome_mark_engraver, break_aligned);
161 ADD_ACKNOWLEDGER (Metronome_mark_engraver, grob);
163 ADD_TRANSLATOR (Metronome_mark_engraver,
165 "Engrave metronome marking. This delegates the formatting"
166 " work to the function in the @code{metronomeMarkFormatter}"
167 " property. The mark is put over all staves. The staves are"
168 " taken from the @code{stavesFound} property, which is"
169 " maintained by @ref{Staff_collecting_engraver}.",
176 "metronomeMarkFormatter "