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/*
This file is part of LilyPond, the GNU music typesetter.
Copyright (C) 2004--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
LilyPond is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
LilyPond is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
#include "pointer-group-interface.hh"
#include "spanner.hh"
#include "engraver.hh"
#include "staff-symbol.hh"
#include "translator.icc"
class Ledger_line_engraver : public Engraver
{
Spanner *span_;
vector<Grob *> ledgered_grobs_;
public:
TRANSLATOR_DECLARATIONS (Ledger_line_engraver);
protected:
virtual void finalize ();
void process_music ();
void acknowledge_ledgered (Grob_info);
void acknowledge_staff_symbol (Grob_info);
void start_spanner ();
void stop_spanner ();
void stop_translation_timestep ();
};
Ledger_line_engraver::Ledger_line_engraver ()
{
span_ = 0;
}
void
Ledger_line_engraver::start_spanner ()
{
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_)
{
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_ = 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_ledgered (Grob_info s)
{
ledgered_grobs_.push_back (s.grob ());
}
void
Ledger_line_engraver::boot ()
{
ADD_ACKNOWLEDGER (Ledger_line_engraver, ledgered);
ADD_ACKNOWLEDGER (Ledger_line_engraver, staff_symbol);
}
ADD_TRANSLATOR (Ledger_line_engraver,
/* doc */
"Create the spanner to draw ledger lines, and notices"
" objects that need ledger lines.",
/* create */
"LedgerLineSpanner ",
/* read */
"",
/* write */
""
);
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