/*
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--2005 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 "lyric-extender.hh"
-#include "paper-column.hh"
-#include "item.hh"
+#include "context.hh"
#include "engraver.hh"
-#include "drul-array.hh"
+#include "group-interface.hh"
+#include "item.hh"
#include "lyric-extender.hh"
-#include "pqueue.hh"
+#include "note-head.hh"
+#include "warn.hh"
+void completize_extender (Spanner *sp);
-/**
- 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_l_;
- Grob *current_lyric_l_;
- Extender_req* req_l_;
- Spanner* extender_p_;
+ Music *ev_;
+ Spanner *extender_;
+ Spanner *pending_extender_;
+
public:
- Extender_engraver ();
- VIRTUAL_COPY_CONS (Translator);
+ TRANSLATOR_DECLARATIONS (Extender_engraver);
protected:
virtual void acknowledge_grob (Grob_info);
virtual void finalize ();
virtual bool try_music (Music*);
virtual void stop_translation_timestep ();
- virtual void start_translation_timestep ();
virtual void process_music ();
-private:
-
};
-ADD_THIS_TRANSLATOR (Extender_engraver);
-
Extender_engraver::Extender_engraver ()
{
- current_lyric_l_ = 0;
- last_lyric_l_ = 0;
- extender_p_ = 0;
- req_l_ = 0;
+ extender_ = 0;
+ pending_extender_ = 0;
+ ev_ = 0;
}
-void
-Extender_engraver::acknowledge_grob (Grob_info i)
+bool
+Extender_engraver::try_music (Music *r)
{
- // -> text_item
- if (i.elem_l_->has_interface (ly_symbol2scm ("lyric-syllable-interface")))
+ if (!ev_)
{
- current_lyric_l_ = i.elem_l_;
- if (extender_p_
- && !extender_p_->get_bound (RIGHT)
- )
- {
- Lyric_extender::set_textitem (extender_p_, RIGHT, dynamic_cast<Item*> (i.elem_l_));
- }
+ ev_ = r;
+ return true;
}
+ return false;
}
+void
+Extender_engraver::process_music ()
+{
+ if (ev_)
+ extender_ = make_spanner ("LyricExtender", ev_->self_scm ());
+}
-bool
-Extender_engraver::try_music (Music* r)
+void
+Extender_engraver::acknowledge_grob (Grob_info i)
{
- if (Extender_req* p = dynamic_cast <Extender_req *> (r))
+ Item *item = dynamic_cast<Item*> (i.grob_);
+
+ if (item
+ && item->internal_has_interface (ly_symbol2scm ("lyric-syllable-interface")))
{
- if (req_l_)
- return false;
+ if (extender_)
+ extender_->set_bound (LEFT, item);
- req_l_ = p;
- return true;
+ if (pending_extender_)
+ {
+ pending_extender_->set_property ("next", item->self_scm ());
+ completize_extender (pending_extender_);
+ pending_extender_ = 0;
+ }
}
- return false;
}
void
-Extender_engraver::finalize ()
+Extender_engraver::stop_translation_timestep ()
{
- if (extender_p_)
+ if (extender_ || pending_extender_)
{
- req_l_->origin ()->warning (_ ("unterminated extender"));
- extender_p_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
+ Context *voice = get_voice_to_lyrics (context ());
+ Grob *h = voice ? get_current_note_head (voice) : 0;
+
+ if (h)
+ {
+ if (extender_)
+ {
+ Pointer_group_interface::add_grob (extender_,
+ ly_symbol2scm ("heads"), h);
+ }
+
+ if (pending_extender_)
+ {
+ Pointer_group_interface::add_grob (pending_extender_,
+ ly_symbol2scm ("heads"), h);
+ }
+ }
+
+ if (extender_)
+ {
+ pending_extender_ = extender_;
+ extender_ = 0;
+ }
}
+
+ ev_ = 0;
}
void
-Extender_engraver::process_music ()
+completize_extender (Spanner *sp)
{
- if (req_l_ && ! extender_p_)
+ if (!sp->get_bound (RIGHT))
{
- if (!last_lyric_l_)
+ SCM heads = sp->get_property ("heads");
+ if (scm_is_pair (heads))
{
- req_l_->origin ()->warning (_ ("Nothing to connect extender to on the left. Ignoring extender request."));
- return;
+ Item *it = dynamic_cast<Item*> (unsmob_grob (scm_car (heads)));
+ if (it)
+ sp->set_bound (RIGHT, it);
}
-
- extender_p_ = new Spanner (get_property ("LyricExtender"));
-
-
- Lyric_extender::set_textitem (extender_p_, LEFT, last_lyric_l_);
- announce_grob (extender_p_, req_l_);
}
}
-
void
-Extender_engraver::stop_translation_timestep ()
+Extender_engraver::finalize ()
{
- if (extender_p_)
+ if (extender_)
{
- typeset_grob (extender_p_);
- extender_p_ = 0;
+ completize_extender (extender_);
+
+ if (!extender_->get_bound (RIGHT))
+ extender_->warning (_ ("unterminated extender"));
+ extender_ = 0;
}
- if (current_lyric_l_)
+ if (pending_extender_)
{
- last_lyric_l_ = current_lyric_l_;
- current_lyric_l_ =0;
- }
-}
+ completize_extender (pending_extender_);
-void
-Extender_engraver::start_translation_timestep ()
-{
- req_l_ = 0;
+ if (!pending_extender_->get_bound (RIGHT))
+ pending_extender_->warning (_ ("unterminated extender"));
+ pending_extender_ = 0;
+ }
}
+ADD_TRANSLATOR (Extender_engraver,
+/* descr */ "Create lyric extenders",
+/* creats*/ "LyricExtender",
+/* accepts */ "extender-event",
+/* acks */ "lyric-syllable-interface",
+/* reads */ "",
+/* write */ "");