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);
50 virtual void derived_mark () const;
51 void stop_translation_timestep ();
52 void process_music ();
55 Metronome_mark_engraver::Metronome_mark_engraver ()
59 last_duration_ = SCM_EOL;
60 last_count_ = SCM_EOL;
65 Metronome_mark_engraver::derived_mark () const
67 scm_gc_mark (last_count_);
68 scm_gc_mark (last_duration_);
69 scm_gc_mark (last_text_);
73 Metronome_mark_engraver::acknowledge_break_aligned (Grob_info inf)
75 Grob *s = inf.grob ();
77 && (s->get_property_data ("break-align-symbol")
78 == text_->get_property_data ("break-align-symbol")))
85 Metronome_mark_engraver::stop_translation_timestep ()
92 Gardner Read "Music Notation", p.278
94 Align the metronome mark over the time signature (or the
95 first notational element of the measure if no time
96 signature is present in that measure).
98 Grob *mc = unsmob_grob (get_property ("currentMusicalColumn"));
99 text_->set_parent (mc, X_AXIS);
101 text_->set_object ("side-support-elements",
102 grob_list_to_grob_array (get_property ("stavesFound")));
109 Metronome_mark_engraver::process_music ()
111 SCM count = get_property ("tempoUnitCount");
112 SCM duration = get_property ("tempoUnitDuration");
113 SCM text = get_property ("tempoText");
115 if ( ( (unsmob_duration (duration) && scm_is_number (count))
116 || Text_interface::is_markup (text) )
117 && !(ly_is_equal (count, last_count_)
118 && ly_is_equal (duration, last_duration_)
119 && ly_is_equal (text, last_text_)))
121 text_ = make_item ("MetronomeMark", SCM_EOL);
123 SCM proc = get_property ("metronomeMarkFormatter");
124 SCM result = scm_call_4 (proc,
128 context ()->self_scm ());
130 text_->set_property ("text", result);
133 last_duration_ = duration;
140 ADD_ACKNOWLEDGER (Metronome_mark_engraver, break_aligned);
142 ADD_TRANSLATOR (Metronome_mark_engraver,
144 "Engrave metronome marking. This delegates the formatting"
145 " work to the function in the @code{metronomeMarkFormatter}"
146 " property. The mark is put over all staves. The staves are"
147 " taken from the @code{stavesFound} property, which is"
148 " maintained by @ref{Staff_collecting_engraver}.",
155 "metronomeMarkFormatter "