/*
extender-engraver.cc -- implement Extender_engraver
- (c) 1998--1999 Jan Nieuwenhuizen <janneke@gnu.org>
+ (c) 1999 Glen Prideaux <glenprideaux@iname.com>,
+ Han-Wen Nienhuys, Jan Nieuwenhuizen.
+
*/
-#include "proto.hh"
+#include "flower-proto.hh"
#include "musical-request.hh"
-#include "extender-engraver.hh"
-#include "extender-spanner.hh"
-#include "text-def.hh"
-#include "score-column.hh"
-#include "g-text-item.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
+{
+ Score_element *last_lyric_l_;
+ Score_element *current_lyric_l_;
+ Extender_req* req_l_;
+ Spanner* extender_p_;
+public:
+ Extender_engraver ();
+ VIRTUAL_COPY_CONS (Translator);
+
+protected:
+ virtual void acknowledge_element (Score_element_info);
+ virtual void do_removal_processing();
+ virtual void do_process_music();
+ virtual bool do_try_music (Music*);
+ virtual void do_pre_move_processing();
+ virtual void do_post_move_processing ();
+private:
+
+};
+
ADD_THIS_TRANSLATOR (Extender_engraver);
Extender_engraver::Extender_engraver ()
{
- extender_spanner_p_ = 0;
- span_reqs_drul_[RIGHT] = span_reqs_drul_[LEFT] = 0;
+ current_lyric_l_ = 0;
+ last_lyric_l_ = 0;
+ extender_p_ = 0;
+ req_l_ = 0;
}
void
Extender_engraver::acknowledge_element (Score_element_info i)
{
- G_text_item* t = dynamic_cast<G_text_item*> (i.elem_l_);
- if (!t)
- return;
- if (!extender_spanner_p_)
- return;
- if (!span_reqs_drul_[LEFT])
- return;
-
- if (!extender_spanner_p_->item_l_drul_[LEFT])
- extender_spanner_p_->set_textitem (LEFT, t);
- else
- if (span_reqs_drul_[RIGHT] && !extender_spanner_p_->item_l_drul_[RIGHT])
- extender_spanner_p_->set_textitem (RIGHT, t);
+ // -> text_item
+ if (i.elem_l_->has_interface (ly_symbol2scm("text-item-interface")))
+
+ {
+ current_lyric_l_ = i.elem_l_;
+ if (extender_p_
+ && !extender_p_->get_bound (RIGHT)
+ )
+ {
+ Lyric_extender(extender_p_).set_textitem (RIGHT, dynamic_cast<Item*> (i.elem_l_));
+ }
+ }
}
+
bool
-Extender_engraver::do_try_music (Music* req_l)
+Extender_engraver::do_try_music (Music* r)
{
- if (Extender_req* p = dynamic_cast <Extender_req *> (req_l))
+ if (Extender_req* p = dynamic_cast <Extender_req *> (r))
{
- if (bool (extender_spanner_p_) == bool (p->spantype_ == START))
- return false;
-
- Direction d = (!extender_spanner_p_) ? LEFT : RIGHT;
- if (span_reqs_drul_[d] && !span_reqs_drul_[d]->equal_b (p))
+ if (req_l_)
return false;
- span_reqs_drul_[d] = p;
- span_mom_drul_[d] = get_staff_info ().musical_l ()->when ();
+ req_l_ = p;
return true;
}
return false;
void
Extender_engraver::do_removal_processing ()
{
- if (extender_spanner_p_)
+ if (extender_p_)
{
- span_reqs_drul_[LEFT]->warning (_ ("unterminated extender"));
- extender_spanner_p_->set_bounds(RIGHT, get_staff_info ().command_l ());
+ req_l_->origin ()->warning (_ ("unterminated extender"));
+ extender_p_->set_bound(RIGHT, unsmob_element (get_property ("currentCommandColumn")));
}
}
void
-Extender_engraver::do_process_requests ()
+Extender_engraver::do_process_music ()
{
- if (extender_spanner_p_ || !span_reqs_drul_[LEFT])
- return;
+ if (req_l_)
+ {
+ if (!last_lyric_l_)
+ {
+ req_l_->origin ()->warning (_ ("Nothing to connect extender to on the left. Ignoring extender request."));
+ return;
+ }
+
+ extender_p_ = new Spanner (get_property ("LyricExtender"));
- extender_spanner_p_ = new Extender_spanner;
- announce_element (Score_element_info (extender_spanner_p_, span_reqs_drul_[LEFT]));
+ Lyric_extender (extender_p_).set_textitem (LEFT, last_lyric_l_);
+ announce_element (extender_p_, req_l_);
+ }
}
+
void
Extender_engraver::do_pre_move_processing ()
{
- if (!extender_spanner_p_ || !span_reqs_drul_[RIGHT])
- return;
+ if (extender_p_)
+ {
+ typeset_element (extender_p_);
+ extender_p_ = 0;
+ }
- typeset_element (extender_spanner_p_);
-
- extender_spanner_p_ = 0;
- span_reqs_drul_[RIGHT] = span_reqs_drul_[LEFT] = 0;
+ if (current_lyric_l_)
+ {
+ last_lyric_l_ = current_lyric_l_;
+ current_lyric_l_ =0;
+ }
}
+void
+Extender_engraver::do_post_move_processing ()
+{
+ req_l_ = 0;
+}
+
+