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/*
staff-symbol-engraver.cc -- implement Staff_symbol_engraver
source file of the GNU LilyPond music typesetter
(c) 1997--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
*/
#include "spanner.hh"
#include "engraver.hh"
class Staff_symbol_engraver : public Engraver
{
public:
TRANSLATOR_DECLARATIONS (Staff_symbol_engraver);
protected:
Drul_array<Music *> span_events_;
Spanner *span_;
Spanner *finished_span_;
bool first_start_;
protected:
virtual void start_spanner ();
virtual void stop_spanner ();
void stop_translation_timestep ();
virtual bool try_music (Music *);
virtual ~Staff_symbol_engraver ();
DECLARE_ACKNOWLEDGER (grob);
virtual void finalize ();
void process_music ();
};
Staff_symbol_engraver::~Staff_symbol_engraver ()
{
assert (!span_);
}
Staff_symbol_engraver::Staff_symbol_engraver ()
{
finished_span_ = 0;
first_start_ = true;
span_ = 0;
span_events_[LEFT] = 0;
span_events_[RIGHT] = 0;
}
bool
Staff_symbol_engraver::try_music (Music *music)
{
Direction d = to_dir (music->get_property ("span-direction"));
if (d)
{
span_events_[d] = music;
return true;
}
return false;
}
void
Staff_symbol_engraver::process_music ()
{
if (span_events_[STOP])
{
finished_span_ = span_;
span_ = 0;
if (first_start_)
first_start_ = false;
}
if (span_events_[START]
|| (first_start_ && !span_events_[STOP]))
start_spanner ();
}
void
Staff_symbol_engraver::start_spanner ()
{
if (!span_)
{
span_ = make_spanner ("StaffSymbol", SCM_EOL);
span_->set_bound (LEFT,
unsmob_grob (get_property ("currentCommandColumn")));
}
}
void
Staff_symbol_engraver::stop_spanner ()
{
if (!finished_span_)
return;
if (!finished_span_->get_bound (RIGHT))
finished_span_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
announce_end_grob (finished_span_,
span_events_[STOP]
? span_events_[STOP]->self_scm ()
: SCM_EOL);
finished_span_ = 0;
}
void
Staff_symbol_engraver::stop_translation_timestep ()
{
if ((span_events_[START] || first_start_)
&& span_)
{
first_start_ = false;
}
span_events_[START] = 0;
span_events_[STOP] = 0;
stop_spanner ();
}
void
Staff_symbol_engraver::finalize ()
{
finished_span_ = span_;
span_ = 0;
stop_spanner ();
}
/*
Todo: staff-symbol-referencer iface.
*/
void
Staff_symbol_engraver::acknowledge_grob (Grob_info s)
{
/*
Perhaps should try to take SeparationItem as bound of the staff
symbol?
*/
if (span_ || finished_span_)
{
Spanner *my = span_ ? span_ : finished_span_;
s.grob ()->set_object ("staff-symbol", my->self_scm ());
}
}
#include "translator.icc"
ADD_ACKNOWLEDGER (Staff_symbol_engraver, grob);
ADD_TRANSLATOR (Staff_symbol_engraver,
/* doc */ "Create the constellation of five (default) "
"staff lines.",
/* create */ "StaffSymbol",
/* accept */ "staff-span-event",
/* read */ "",
/* write */ "");
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