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"
14 TODO: should sync with Staff_symbol_engraver.
16 class Ledger_line_engraver : public Engraver
21 TRANSLATOR_DECLARATIONS (Ledger_line_engraver);
24 virtual void finalize ();
25 virtual void process_music ();
26 virtual void acknowledge_grob (Grob_info);
29 Ledger_line_engraver::Ledger_line_engraver ()
35 Ledger_line_engraver::process_music ()
39 span_ = make_spanner ("LedgerLineSpanner", SCM_EOL);
41 span_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
46 Ledger_line_engraver::finalize ()
49 span_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
53 Ledger_line_engraver::acknowledge_grob (Grob_info s)
55 if (!to_boolean (s.grob_->get_property ("no-ledgers")))
56 Pointer_group_interface::add_grob (span_, ly_symbol2scm ("note-heads"),
59 ADD_TRANSLATOR (Ledger_line_engraver,
60 "Creates the spanner to draw ledger lines, and notices objects that need ledger lines",
61 /* creats*/ "LedgerLineSpanner",
63 /* acks */ "ledgered-interface", // ledgered-interface?