/*
extender-engraver.cc -- implement Extender_engraver
- (c) 1999 Glen Prideaux <glenprideaux@iname.com>,
- Han-Wen Nienhuys, Jan Nieuwenhuizen.
+ source file of the GNU LilyPond music typesetter
+ (c) 1999--2004 Glen Prideaux <glenprideaux@iname.com>,
+ Han-Wen Nienhuys <hanwen@cs.uu.nl>,
+ Jan Nieuwenhuizen <janneke@gnu.org>
*/
-#include "flower-proto.hh"
-#include "musical-request.hh"
+#include "warn.hh"
#include "lyric-extender.hh"
-#include "paper-column.hh"
#include "item.hh"
#include "engraver.hh"
-#include "drul-array.hh"
-#include "lyric-extender.hh"
-#include "pqueue.hh"
-
-
-/**
- Generate an centred extender. Should make a Extender_spanner that
- typesets a nice centred extender of varying length depending on the
- gap between syllables.
- We remember the last Item that come across. When we get a
- request, we create the spanner, and attach the left point to the
- last lyrics, and the right point to any lyrics we receive by
- then. */
class Extender_engraver : public Engraver
{
- Grob *last_lyric_;
- Grob *current_lyric_;
- Extender_req* req_;
+ Music* ev_;
Spanner* extender_;
+ Spanner * finished_extender_;
public:
TRANSLATOR_DECLARATIONS(Extender_engraver);
virtual void finalize ();
virtual bool try_music (Music*);
virtual void stop_translation_timestep ();
- virtual void start_translation_timestep ();
virtual void process_music ();
private:
Extender_engraver::Extender_engraver ()
{
- current_lyric_ = 0;
- last_lyric_ = 0;
extender_ = 0;
- req_ = 0;
+ finished_extender_ = 0;
+ ev_ = 0;
}
void
Extender_engraver::acknowledge_grob (Grob_info i)
{
+ Item * item = dynamic_cast<Item*> (i.grob_);
// -> text_item
- if (i.grob_->internal_has_interface (ly_symbol2scm ("lyric-syllable-interface")))
+ if (item && item->internal_has_interface (ly_symbol2scm ("lyric-syllable-interface")))
{
- current_lyric_ = i.grob_;
- if (extender_
- && !extender_->get_bound (RIGHT)
- )
- {
- Lyric_extender::set_textitem (extender_, RIGHT, dynamic_cast<Item*> (i.grob_));
- }
+ if (extender_)
+ extender_->set_bound (LEFT, item);
+
+ if (finished_extender_)
+ finished_extender_->set_bound (RIGHT, item);
}
}
bool
Extender_engraver::try_music (Music* r)
{
- if (Extender_req* p = dynamic_cast <Extender_req *> (r))
- {
- if (req_)
- return false;
+ if (ev_)
+ return false;
- req_ = p;
- return true;
+ ev_ = r;
+ return true;
+}
+
+void
+completize_extender (Spanner* sp)
+{
+ if (!sp->get_bound (RIGHT))
+ {
+ SCM heads = sp->get_grob_property ("heads");
+ if (gh_pair_p (heads))
+ {
+ Item* it = dynamic_cast<Item*> (unsmob_grob (gh_car (heads)));
+ if (it)
+ sp->set_bound (RIGHT, it);
+ }
}
- return false;
}
+
+
void
Extender_engraver::finalize ()
{
if (extender_)
{
- req_->origin ()->warning (_ ("unterminated extender"));
- extender_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
+ completize_extender (extender_);
+
+ if (!extender_->get_bound (RIGHT))
+ extender_->warning (_ ("unterminated extender"));
+ typeset_grob (extender_);
+ extender_ = 0;
+ }
+
+ if (finished_extender_)
+ {
+ completize_extender (finished_extender_);
+
+ if (!finished_extender_->get_bound (RIGHT))
+ finished_extender_->warning (_("unterminated extender"));
+ typeset_grob (finished_extender_);
+ finished_extender_ =0;
}
}
void
Extender_engraver::process_music ()
{
- if (req_ && ! extender_)
+ if (ev_)
{
- if (!last_lyric_)
- {
- req_->origin ()->warning (_ ("Nothing to connect extender to on the left. Ignoring extender request."));
- return;
- }
-
- extender_ = new Spanner (get_property ("LyricExtender"));
-
-
- Lyric_extender::set_textitem (extender_, LEFT, last_lyric_);
- announce_grob(extender_, req_->self_scm());
+ extender_ = make_spanner ("LyricExtender");
+ announce_grob (extender_, ev_->self_scm());
}
}
void
Extender_engraver::stop_translation_timestep ()
{
- if (extender_)
+ if (finished_extender_ && finished_extender_->get_bound (RIGHT))
{
- typeset_grob (extender_);
- extender_ = 0;
+ typeset_grob (finished_extender_);
+ finished_extender_ = 0;
}
- if (current_lyric_)
+ if (finished_extender_ && extender_)
{
- last_lyric_ = current_lyric_;
- current_lyric_ =0;
+ programming_error ("Haven't finished extender yet.");
+ typeset_grob (finished_extender_);
+ finished_extender_ =0;
}
-}
+
+ if (extender_)
+ finished_extender_ = extender_;
+ extender_ = 0;
-void
-Extender_engraver::start_translation_timestep ()
-{
- req_ = 0;
+ ev_ = 0;
}
+
ENTER_DESCRIPTION(Extender_engraver,
/* descr */ "Create lyric extenders",
/* creats*/ "LyricExtender",
+/* accepts */ "extender-event",
/* acks */ "lyric-syllable-interface",
/* reads */ "",
/* write */ "");