-/*
- ledger-line-engraver.cc -- implement Ledger_line_engraver=
-
+/*
+ ledger-line-engraver.cc -- implement Ledger_line_engraver
+
source file of the GNU LilyPond music typesetter
-
- (c) 2004 Han-Wen Nienhuys <hanwen@xs4all.nl>
-
-*/
+ (c) 2004--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
+*/
-#include "group-interface.hh"
+#include "pointer-group-interface.hh"
#include "spanner.hh"
#include "engraver.hh"
-#include "ambitus.hh"
+#include "staff-symbol.hh"
class Ledger_line_engraver : public Engraver
{
- Spanner * span_;
-
+ Spanner *span_;
+ vector<Grob*> ledgered_grobs_;
+
public:
TRANSLATOR_DECLARATIONS (Ledger_line_engraver);
protected:
virtual void finalize ();
- virtual void process_music ();
- virtual void acknowledge_grob (Grob_info);
+ void process_music ();
+
+ DECLARE_ACKNOWLEDGER (ledgered);
+ DECLARE_ACKNOWLEDGER (staff_symbol);
+
+ void start_spanner ();
+ void stop_spanner ();
+ void stop_translation_timestep ();
};
-Ledger_line_engraver::Ledger_line_engraver()
+Ledger_line_engraver::Ledger_line_engraver ()
{
span_ = 0;
}
void
-Ledger_line_engraver::process_music ()
+Ledger_line_engraver::start_spanner ()
{
- if (!span_)
+ assert (!span_);
+
+ span_ = make_spanner ("LedgerLineSpanner", SCM_EOL);
+ span_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
+}
+
+void
+Ledger_line_engraver::stop_translation_timestep ()
+{
+ if (span_)
{
- span_ = make_spanner("LedgerLineSpanner", SCM_EOL);
-
- span_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
+ for (vsize i = 0; i < ledgered_grobs_.size (); i++)
+ {
+ if (!to_boolean (ledgered_grobs_[i]->get_property ("no-ledgers")))
+ Pointer_group_interface::add_grob (span_,
+ ly_symbol2scm ("note-heads"),
+ ledgered_grobs_[i]);
+ }
}
+
+ ledgered_grobs_.clear ();
+}
+
+void
+Ledger_line_engraver::process_music ()
+{
+ /*
+ Need to do this, otherwise the first note might miss ledgers.
+ */
+ if (!span_)
+ start_spanner ();
}
void
Ledger_line_engraver::finalize ()
+{
+ stop_spanner ();
+}
+
+void
+Ledger_line_engraver::stop_spanner ()
{
if (span_)
- span_->set_bound (RIGHT,unsmob_grob (get_property ("currentCommandColumn")));
+ {
+ span_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
+ Pointer_group_interface::set_ordered (span_, ly_symbol2scm ("elements"), false);
+ span_ = 0;
+ }
}
+void
+Ledger_line_engraver::acknowledge_staff_symbol (Grob_info s)
+{
+ Spanner *sym = dynamic_cast<Spanner *> (s.grob ());
+
+ if (!span_
+ || (span_->get_bound (LEFT) != sym->get_bound (LEFT)))
+ {
+ stop_spanner ();
+ start_spanner ();
+ }
+}
void
-Ledger_line_engraver::acknowledge_grob (Grob_info s)
+Ledger_line_engraver::acknowledge_ledgered (Grob_info s)
{
- Pointer_group_interface::add_grob (span_, ly_symbol2scm ("note-heads"),
- s.grob_);
+ ledgered_grobs_.push_back (s.grob ());
}
-ENTER_DESCRIPTION (Ledger_line_engraver,
- "Creates spanner to draw ledger lines",
- /* creats*/ "LedgerLineSpanner",
- /* accepts */ "",
- /* acks */ "custos-interface note-head-interface", // ledgered-interface?
- /* reads */ "",
- /* write */ "")
+
+#include "translator.icc"
+
+ADD_ACKNOWLEDGER (Ledger_line_engraver, ledgered);
+ADD_ACKNOWLEDGER (Ledger_line_engraver, staff_symbol);
+ADD_TRANSLATOR (Ledger_line_engraver,
+ "Creates the spanner to draw ledger lines, and notices objects that need ledger lines",
+ /* create */ "LedgerLineSpanner",
+ /* read */ "",
+ /* write */ "")