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-engraver.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
  20   int switch_pitch_i_ ;
  21 protected:
  22   virtual bool do_try_music (Music* m);
  23   virtual void do_creation_processing ();
  24
  25   void default_voice (Direction);
  26 public:
  27   Staff_switching_translator ();
  28   VIRTUAL_COPY_CONS(Translator);
  29 };
  30
  31 Staff_switching_translator::Staff_switching_translator ()
  32 {
  33   switch_pitch_i_ =0;
  34 }
  35
  36 void
  37 Staff_switching_translator::do_creation_processing ()
  38 {
  39   Translator_group * daddy =daddy_grav_l (); // staff switching context
  40
  41
  42   Scalar pit = get_property ("switchPitch", 0);
  43   if (pit.isnum_b ())
  44     switch_pitch_i_ = int (pit);
  45   Scalar s = get_property("staffContextName", 0);
  46   Scalar up = get_property ("upStaffName",0);
  47   Scalar down = get_property ("downStaffName",0);
  48   if (!up.length_i()) up = "upper";
  49   if (!down.length_i()) up = "lower";
  50
  51   staff_handle_drul_[UP].set_translator (daddy->daddy_trans_l_ -> find_create_translator_l (s, up));
  52   staff_handle_drul_[DOWN].set_translator (daddy->daddy_trans_l_-> find_create_translator_l (s, down));
  53
  54
  55   staff_handle_drul_[DOWN].report_to_l ()->set_property ("defaultClef", "bass");
  56
  57   default_voice (UP);
  58 }
  59
  60
  61 void
  62 Staff_switching_translator::default_voice (Direction d)
  63 {
  64   Scalar s = get_property ("acceptorName",0);
  65   my_voice_.set_translator (staff_handle_drul_[d].report_to_l ()->find_create_translator_l ("Thread", daddy_trans_l_->id_str_));
  66 }
  67
  68 bool
  69 Staff_switching_translator::do_try_music (Music*m)
  70 {
  71   if (Note_req*nr = dynamic_cast<Note_req*> (m))
  72     {
  73       Direction staff =  (nr->pitch_.semitone_pitch () >= switch_pitch_i_)
  74         ? UP
  75         : DOWN;
  76
  77
  78       Translator_group * mv = my_voice_.report_to_l ();
  79       Translator_group *dest_staff =staff_handle_drul_[staff].report_to_l ();
  80       Scalar s = get_property ("switcherName", 0);
  81
  82       while (mv && mv->type_str_ != s)
  83         {
  84           mv = mv -> daddy_trans_l_;
  85         }
  86
  87       if (!mv)
  88         default_voice (staff);
  89
  90       if (mv->daddy_trans_l_  != dest_staff)
  91         {
  92           mv->daddy_trans_l_->remove_translator_p (mv);
  93           dest_staff->add_translator (mv);
  94         }
  95     }
  96
  97   return my_voice_.try_music (m);
  98 }
  99
 100 ADD_THIS_TRANSLATOR(Staff_switching_translator);