lily/staff-switching-translator.cc

   1 /*
   2   staff-switching-translator.cc -- implement Staff_switching_translator
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9 #include "engraver.hh"
  10 #include "interpretation-context-handle.hh"
  11 #include "drul-array.hh"
  12 #include "engraver-group.hh"
  13 #include "musical-request.hh"
  14
  15 class Staff_switching_translator : public Engraver
  16 {
  17   Interpretation_context_handle my_voice_;
  18   Drul_array<Interpretation_context_handle> staff_handle_drul_;
  19 protected:
  20   virtual bool do_try_music (Music* m);
  21   virtual void do_creation_processing ();
  22 public:
  23   Staff_switching_translator ();
  24   VIRTUAL_COPY_CONS(Translator);
  25 };
  26
  27 Staff_switching_translator::Staff_switching_translator ()
  28 {
  29 }
  30
  31 void
  32 Staff_switching_translator::do_creation_processing ()
  33 {
  34   Translator_group * daddy =daddy_grav_l (); // staff switching context
  35
  36   staff_handle_drul_[UP].set_translator (daddy->daddy_trans_l_ -> find_create_translator_l ("Staff", "upper"));
  37   staff_handle_drul_[DOWN].set_translator (daddy->daddy_trans_l_-> find_create_translator_l ("Staff", "lower"));
  38
  39
  40   staff_handle_drul_[DOWN].report_to_l ()->set_property ("defaultClef", "bass");
  41
  42   my_voice_.set_translator (staff_handle_drul_[UP].report_to_l ()->find_create_translator_l ("Voice", daddy->id_str_));
  43 }
  44
  45 bool
  46 Staff_switching_translator::do_try_music (Music*m)
  47 {
  48   if (Note_req*nr = dynamic_cast<Note_req*> (m))
  49     {
  50       Direction staff =  (nr->pitch_.semitone_pitch () >= 0)
  51         ? UP
  52         : DOWN;
  53
  54
  55       Translator_group * mv = my_voice_.report_to_l ();
  56       Translator_group *dest_staff =staff_handle_drul_[staff].report_to_l ();
  57       if (mv->daddy_trans_l_  != dest_staff)
  58         {
  59           mv->daddy_trans_l_->remove_translator_p (mv);
  60           dest_staff->add_translator (mv);
  61         }
  62     }
  63
  64   return my_voice_.try_music (m);
  65 }
  66
  67 ADD_THIS_TRANSLATOR(Staff_switching_translator);