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/*
text-spanner-engraver.cc -- implement Text_spanner_engraver
source file of the GNU LilyPond music typesetter
(c) 2000--2006 Jan Nieuwenhuizen <janneke@gnu.org>
*/
#include "engraver.hh"
#include "international.hh"
#include "note-column.hh"
#include "side-position-interface.hh"
#include "stream-event.hh"
#include "translator.icc"
class Text_spanner_engraver : public Engraver
{
public:
TRANSLATOR_DECLARATIONS (Text_spanner_engraver);
protected:
virtual void finalize ();
DECLARE_ACKNOWLEDGER (note_column);
DECLARE_TRANSLATOR_LISTENER (text_span);
void stop_translation_timestep ();
void process_music ();
private:
Spanner *span_;
Spanner *finished_;
Stream_event *current_event_;
Drul_array<Stream_event *> event_drul_;
void typeset_all ();
};
Text_spanner_engraver::Text_spanner_engraver ()
{
finished_ = 0;
current_event_ = 0;
span_ = 0;
event_drul_[START] = 0;
event_drul_[STOP] = 0;
}
IMPLEMENT_TRANSLATOR_LISTENER (Text_spanner_engraver, text_span);
void
Text_spanner_engraver::listen_text_span (Stream_event *ev)
{
Direction d = to_dir (ev->get_property ("span-direction"));
event_drul_[d] = ev;
}
void
Text_spanner_engraver::process_music ()
{
if (event_drul_[STOP])
{
if (!span_)
event_drul_[STOP]->origin ()->warning (_ ("can't find start of text spanner"));
else
{
finished_ = span_;
span_ = 0;
current_event_ = 0;
}
}
if (event_drul_[START])
{
if (current_event_)
event_drul_[START]->origin ()->warning (_ ("already have a text spanner"));
else
{
current_event_ = event_drul_[START];
span_ = make_spanner ("TextSpanner", event_drul_[START]->self_scm ());
Side_position_interface::set_axis (span_, Y_AXIS);
event_drul_[START] = 0;
}
}
}
void
Text_spanner_engraver::acknowledge_note_column (Grob_info info)
{
Spanner *spans[2] ={span_, finished_};
for (int i = 0; i < 2; i++)
{
if (spans[i])
{
Side_position_interface::add_support (spans[i], info.grob ());
add_bound_item (spans[i], dynamic_cast<Item *> (info.grob ()));
}
}
}
void
Text_spanner_engraver::typeset_all ()
{
if (finished_)
{
if (!finished_->get_bound (RIGHT))
{
Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
finished_->set_bound (RIGHT, e);
}
finished_ = 0;
}
}
void
Text_spanner_engraver::stop_translation_timestep ()
{
if (span_ && !span_->get_bound (LEFT))
{
Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
span_->set_bound (LEFT, e);
}
typeset_all ();
event_drul_[START] = 0;
event_drul_[STOP] = 0;
}
void
Text_spanner_engraver::finalize ()
{
typeset_all ();
if (span_)
{
current_event_->origin ()->warning (_ ("unterminated text spanner"));
span_->suicide ();
span_ = 0;
}
}
ADD_ACKNOWLEDGER (Text_spanner_engraver, note_column);
ADD_TRANSLATOR (Text_spanner_engraver,
/* doc */ "Create text spanner from a Music.",
/* create */ "TextSpanner",
/* accept */ "text-span-event",
/* read */ "",
/* write */ "");
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