* flower

[lilypond.git] / lily / note-head-line-engraver.cc

diff --git a/lily/note-head-line-engraver.cc b/lily/note-head-line-engraver.cc
index 58f52a1f35467d2ba515f430a36d43aaa8f383ee..cc9decc52a65e81436fd906474da1ef5765e895f 100644 (file)
--- a/lily/note-head-line-engraver.cc
+++ b/lily/note-head-line-engraver.cc
@@ -1,91 +1,66 @@
-/*   
+/*
   note-head-line-engraver.cc -- implement Note_head_line_engraver
-  
+
   source file of the GNU LilyPond music typesetter
-  
-  (c) 2000--2001 Jan Nieuwenhuizen <janneke@gnu.org>
- */
+
+  (c) 2000--2005 Jan Nieuwenhuizen <janneke@gnu.org>
+*/
 
 #include "engraver.hh"
 #include "group-interface.hh"
-#include "item.hh"
-#include "musical-request.hh"
-#include "spanner.hh"
 #include "stem.hh"
 #include "rhythmic-head.hh"
 #include "side-position-interface.hh"
 #include "staff-symbol-referencer.hh"
-#include "translator-group.hh"
+#include "context.hh"
 
 /**
-   Create line-spanner grobs for glissandi (and possibly other) lines
-   that connect note heads.
-
+   Create line-spanner grobs for lines that connect note heads.
 
    TODO: have the line commit suicide if the notes are connected with
    either slur or beam.
-
 */
 class Note_head_line_engraver : public Engraver
 {
 public:
-  VIRTUAL_COPY_CONS (Translator);
-  Note_head_line_engraver ();
+  TRANSLATOR_DECLARATIONS (Note_head_line_engraver);
 
 protected:
   virtual void acknowledge_grob (Grob_info);
-  virtual void create_grobs ();
+  virtual void process_acknowledged_grobs ();
   virtual void stop_translation_timestep ();
-  virtual bool try_music (Music *);
 
 private:
-  Spanner* line_; 
-  Request* req_;
-  Request* last_req_;
-  Translator* last_staff_;
+  Spanner *line_;
+  Context *last_staff_;
   bool follow_;
-  Grob* head_;
-  Grob* last_head_;
+  Grob *head_;
+  Grob *last_head_;
 };
 
 Note_head_line_engraver::Note_head_line_engraver ()
 {
   line_ = 0;
-  req_ = 0;
-  last_req_ = 0;
   follow_ = false;
   head_ = 0;
   last_head_ = 0;
   last_staff_ = 0;
 }
 
-bool
-Note_head_line_engraver::try_music (Music* m)
-{
-  if (!req_)
-    {
-      if (Glissando_req *r = dynamic_cast<Glissando_req*> (m))
-       {
-         req_ = r;
-         return true;
-       }
-    }
-  return false;
-}
-
 void
 Note_head_line_engraver::acknowledge_grob (Grob_info info)
 {
-  if (Rhythmic_head::has_interface (info.elem_l_))
+  if (Rhythmic_head::has_interface (info.grob_))
     {
-      head_ = info.elem_l_;
+      head_ = info.grob_;
       if (to_boolean (get_property ("followVoice")))
        {
-         Translator_group  * tr = daddy_trans_l_;
-         while (tr && tr->type_str_ != "Staff")
-           tr = tr->daddy_trans_l_ ;
+         Context *tr = context ();
+         while (tr && !tr->is_alias (ly_symbol2scm ("Staff")))
+           tr = tr->get_parent_context ();
 
-         if (tr && tr->type_str_ == "Staff" && tr != last_staff_)
+         if (tr
+             && tr->is_alias (ly_symbol2scm ("Staff")) && tr != last_staff_)
            {
              if (last_head_)
                follow_ = true;
@@ -95,34 +70,21 @@ Note_head_line_engraver::acknowledge_grob (Grob_info info)
     }
 }
 
-
 void
-Note_head_line_engraver::create_grobs ()
+Note_head_line_engraver::process_acknowledged_grobs ()
 {
-  if (!line_ && (follow_ || last_req_) && last_head_ && head_
-      && (last_head_ != head_))
+  if (!line_ && follow_ && last_head_ && head_)
     {
       /* TODO: Don't follow if there's a beam.
 
-        We can't do beam-stuff here, since beam doesn't exist yet.
-        Should probably store follow_ in line_, and suicide at some
-        later point */
+      We can't do beam-stuff here, since beam doesn't exist yet.
+      Should probably store follow_ in line_, and suicide at some
+      later point */
       if (follow_)
-       line_ = new Spanner (get_property ("VoiceFollower"));
-      else
-       line_ = new Spanner (get_property ("Glissando"));
-         
+       line_ = make_spanner ("VoiceFollower", head_->self_scm ());
+
       line_->set_bound (LEFT, last_head_);
       line_->set_bound (RIGHT, head_);
-         
-         /* Note, mustn't set y-parent of breakable symbol to simple item:
-            one of the two broken parts won't have an y-parent! */
-         /* X parent is set by set_bound */
-      line_->set_parent (Staff_symbol_referencer::staff_symbol_l (last_head_),
-                        Y_AXIS);
-         
-      announce_grob (line_, last_req_);
-      last_req_ = 0;   
 
       follow_ = false;
     }
@@ -131,22 +93,18 @@ Note_head_line_engraver::create_grobs ()
 void
 Note_head_line_engraver::stop_translation_timestep ()
 {
-  if (line_)
-    {
-      typeset_grob (line_);
-      line_ = 0;
-    }
+  line_ = 0;
   if (head_)
     last_head_ = head_;
   head_ = 0;
-
-  if (req_)
-    {
-      last_req_ = req_;
-      req_ =0;
-    }
 }
 
 
-ADD_THIS_TRANSLATOR (Note_head_line_engraver);
-
+ADD_TRANSLATOR (Note_head_line_engraver,
+               /* descr */ "Engrave a line between two note heads, for example a glissando.  If "
+               " followVoice is set, staff switches also generate a line.",
+               /* creats*/ "Glissando VoiceFollower",
+               /* accepts */ "glissando-event",
+               /* acks  */ "rhythmic-head-interface",
+               /* reads */ "followVoice",
+               /* write */ "");