2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 2004--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 "pointer-group-interface.hh"
22 #include "engraver.hh"
23 #include "staff-symbol.hh"
25 #include "translator.icc"
27 class Ledger_line_engraver : public Engraver
30 vector<Grob *> ledgered_grobs_;
33 TRANSLATOR_DECLARATIONS (Ledger_line_engraver);
36 virtual void finalize ();
37 void process_music ();
39 void acknowledge_ledgered (Grob_info);
40 void acknowledge_staff_symbol (Grob_info);
42 void start_spanner ();
44 void stop_translation_timestep ();
47 Ledger_line_engraver::Ledger_line_engraver (Context *c)
54 Ledger_line_engraver::start_spanner ()
58 span_ = make_spanner ("LedgerLineSpanner", SCM_EOL);
59 span_->set_bound (LEFT, unsmob<Grob> (get_property ("currentCommandColumn")));
63 Ledger_line_engraver::stop_translation_timestep ()
67 for (vsize i = 0; i < ledgered_grobs_.size (); i++)
69 if (!to_boolean (ledgered_grobs_[i]->get_property ("no-ledgers")))
70 Pointer_group_interface::add_grob (span_,
71 ly_symbol2scm ("note-heads"),
76 ledgered_grobs_.clear ();
80 Ledger_line_engraver::process_music ()
83 Need to do this, otherwise the first note might miss ledgers.
90 Ledger_line_engraver::finalize ()
96 Ledger_line_engraver::stop_spanner ()
100 span_->set_bound (RIGHT, unsmob<Grob> (get_property ("currentCommandColumn")));
106 Ledger_line_engraver::acknowledge_staff_symbol (Grob_info s)
108 Spanner *sym = dynamic_cast<Spanner *> (s.grob ());
111 || (span_->get_bound (LEFT) != sym->get_bound (LEFT)))
119 Ledger_line_engraver::acknowledge_ledgered (Grob_info s)
121 ledgered_grobs_.push_back (s.grob ());
125 Ledger_line_engraver::boot ()
127 ADD_ACKNOWLEDGER (Ledger_line_engraver, ledgered);
128 ADD_ACKNOWLEDGER (Ledger_line_engraver, staff_symbol);
131 ADD_TRANSLATOR (Ledger_line_engraver,
133 "Create the spanner to draw ledger lines, and notices"
134 " objects that need ledger lines.",
137 "LedgerLineSpanner ",