2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
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/>.
20 #include "engraver.hh"
21 #include "international.hh"
23 #include "stream-event.hh"
26 #include "translator.icc"
28 class Staff_symbol_engraver : public Engraver
31 TRANSLATOR_DECLARATIONS (Staff_symbol_engraver);
34 Drul_array<Stream_event *> span_events_;
36 Spanner *finished_span_;
40 virtual void start_spanner ();
41 virtual void stop_spanner ();
43 void stop_translation_timestep ();
44 virtual ~Staff_symbol_engraver ();
45 void acknowledge_grob (Grob_info);
46 void listen_staff_span (Stream_event *);
47 virtual void finalize ();
48 void process_music ();
49 virtual void derived_mark () const;
53 Staff_symbol_engraver::derived_mark () const
55 for (LEFT_and_RIGHT (d))
58 scm_gc_mark (span_events_[d]->self_scm ());
62 Staff_symbol_engraver::~Staff_symbol_engraver ()
66 // Somehow finalize() was not called?
67 programming_error ("Have a pending spanner in destructor.");
71 Staff_symbol_engraver::Staff_symbol_engraver (Context *c)
77 span_events_.set (0, 0);
81 Staff_symbol_engraver::listen_staff_span (Stream_event *ev)
83 Direction d = to_dir (ev->get_property ("span-direction"));
85 ASSIGN_EVENT_ONCE (span_events_[d], ev);
87 programming_error ("staff-span event has no direction");
91 Staff_symbol_engraver::process_music ()
93 if (span_events_[STOP])
95 finished_span_ = span_;
101 if (span_events_[START]
102 || (first_start_ && !span_events_[STOP]))
107 Staff_symbol_engraver::start_spanner ()
111 span_ = make_spanner ("StaffSymbol", SCM_EOL);
112 span_->set_bound (LEFT,
113 unsmob<Grob> (get_property ("currentCommandColumn")));
118 Staff_symbol_engraver::stop_spanner ()
123 if (!finished_span_->get_bound (RIGHT))
124 finished_span_->set_bound (RIGHT, unsmob<Grob> (get_property ("currentCommandColumn")));
126 announce_end_grob (finished_span_,
128 ? span_events_[STOP]->self_scm ()
135 Staff_symbol_engraver::stop_translation_timestep ()
137 if ((span_events_[START] || first_start_)
139 first_start_ = false;
141 span_events_.set (0, 0);
146 Staff_symbol_engraver::finalize ()
148 finished_span_ = span_;
154 Todo: staff-symbol-referencer iface.
157 Staff_symbol_engraver::acknowledge_grob (Grob_info s)
159 if (span_ || finished_span_)
161 Spanner *my = span_ ? span_ : finished_span_;
162 s.grob ()->set_object ("staff-symbol", my->self_scm ());
168 Staff_symbol_engraver::boot ()
170 ADD_LISTENER (Staff_symbol_engraver, staff_span);
171 ADD_ACKNOWLEDGER (Staff_symbol_engraver, grob);
174 ADD_TRANSLATOR (Staff_symbol_engraver,
176 "Create the constellation of five (default) staff lines.",