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);
46 DECLARE_ACKNOWLEDGER (break_aligned);
47 DECLARE_ACKNOWLEDGER (break_alignment);
50 virtual void derived_mark () const;
51 void stop_translation_timestep ();
52 void process_music ();
55 Metronome_mark_engraver::Metronome_mark_engraver ()
58 last_duration_ = SCM_EOL;
59 last_count_ = SCM_EOL;
64 Metronome_mark_engraver::derived_mark () const
66 scm_gc_mark (last_count_);
67 scm_gc_mark (last_duration_);
68 scm_gc_mark (last_text_);
72 Metronome_mark_engraver::acknowledge_break_aligned (Grob_info inf)
74 Grob *s = inf.grob ();
76 && !text_->get_parent (X_AXIS)
77 && dynamic_cast<Item *> (s)
78 && (s->get_property_data ("break-align-symbol")
79 == text_->get_property_data ("break-align-symbol")))
80 text_->set_parent (s, X_AXIS);
84 Metronome_mark_engraver::acknowledge_break_alignment (Grob_info inf)
86 Grob *s = inf.grob ();
88 && dynamic_cast<Item *> (s))
90 text_->set_parent (s, X_AXIS);
96 Metronome_mark_engraver::stop_translation_timestep ()
101 Problem: how to set musical columns as parent
102 when there's no breakable object of interest nearby?
103 We don't want metronome marks aligned to paper columns.
105 Grob *mc = unsmob_grob (get_property ("currentMusicalColumn"));
106 text_->set_parent (mc, X_AXIS);
108 text_->set_object ("side-support-elements",
109 grob_list_to_grob_array (get_property ("stavesFound")));
115 Metronome_mark_engraver::process_music ()
117 SCM count = get_property ("tempoUnitCount");
118 SCM duration = get_property ("tempoUnitDuration");
119 SCM text = get_property ("tempoText");
121 if ( ( (unsmob_duration (duration) && scm_is_number (count))
122 || Text_interface::is_markup (text) )
123 && !(ly_is_equal (count, last_count_)
124 && ly_is_equal (duration, last_duration_)
125 && ly_is_equal (text, last_text_)))
127 text_ = make_item ("MetronomeMark", SCM_EOL);
129 SCM proc = get_property ("metronomeMarkFormatter");
130 SCM result = scm_call_4 (proc,
134 context ()->self_scm ());
136 text_->set_property ("text", result);
139 last_duration_ = duration;
146 ADD_ACKNOWLEDGER (Metronome_mark_engraver, break_aligned);
147 ADD_ACKNOWLEDGER (Metronome_mark_engraver, break_alignment);
149 ADD_TRANSLATOR (Metronome_mark_engraver,
151 "Engrave metronome marking. This delegates the formatting"
152 " work to the function in the @code{metronomeMarkFormatter}"
153 " property. The mark is put over all staves. The staves are"
154 " taken from the @code{stavesFound} property, which is"
155 " maintained by @ref{Staff_collecting_engraver}.",
162 "metronomeMarkFormatter "