2 ledger-line-engraver.cc -- implement Ledger_line_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2004--2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "group-interface.hh"
11 #include "engraver.hh"
12 #include "staff-symbol.hh"
14 class Ledger_line_engraver : public Engraver
19 TRANSLATOR_DECLARATIONS (Ledger_line_engraver);
22 virtual void finalize ();
23 virtual void process_music ();
24 virtual void acknowledge_grob (Grob_info);
26 void start_spanner ();
30 Ledger_line_engraver::Ledger_line_engraver ()
36 Ledger_line_engraver::start_spanner ()
39 span_ = make_spanner ("LedgerLineSpanner", SCM_EOL);
41 span_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
45 Ledger_line_engraver::process_music ()
52 Ledger_line_engraver::finalize ()
58 Ledger_line_engraver::stop_spanner ()
62 span_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
68 Ledger_line_engraver::acknowledge_grob (Grob_info s)
70 if (Staff_symbol::has_interface (s.grob ()))
72 Spanner *sym = dynamic_cast<Spanner*> (s.grob ());
75 || span_->get_bound (LEFT) != sym->get_bound (LEFT))
83 if (!to_boolean (s.grob ()->get_property ("no-ledgers")))
84 Pointer_group_interface::add_grob (span_, ly_symbol2scm ("note-heads"),
89 ADD_TRANSLATOR (Ledger_line_engraver,
90 "Creates the spanner to draw ledger lines, and notices objects that need ledger lines",
91 /* creats*/ "LedgerLineSpanner",
93 /* acks */ "staff-symbol-interface ledgered-interface", // ledgered-interface?