lily/auto-change-iterator.cc

   1 /*
   2   auto-change-iterator.cc -- implement  Auto_change_iterator
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "auto-change-music.hh"
  11 #include "auto-change-iterator.hh"
  12 #include "translator-group.hh"
  13 #include "musical-request.hh"
  14
  15
  16
  17 void
  18 Auto_change_iterator::change_to (Music_iterator *it, String to_type,
  19                                  String to_id)
  20 {
  21   Translator_group * current = it->report_to_l ();
  22   Translator_group * last = 0;
  23
  24   /*
  25     Cut & Paste from Change_iterator (ugh).
  26
  27     TODO: abstract this function
  28    */
  29
  30   /* find the type  of translator that we're changing.
  31
  32      If \translator Staff = bass, then look for Staff = *
  33    */
  34   while  (current && current->type_str_ != to_type)
  35     {
  36       last = current;
  37       current = current->daddy_trans_l_;
  38     }
  39
  40   if (current && current->id_str_ == to_id)
  41     {
  42       String msg;
  43       msg += _ ("Can't switch translators, I'm there already");
  44     }
  45
  46   if (current)
  47     if (last)
  48       {
  49         Translator_group * dest =
  50           it->report_to_l ()->find_create_translator_l (to_type, to_id);
  51         current->remove_translator_p (last);
  52         dest->add_translator (last);
  53       }
  54     else
  55       {
  56         /*
  57           We could change the current translator's id, but that would make
  58           errors hard to catch
  59
  60            last->translator_id_str_  = change_l ()->change_to_id_str_;
  61         */
  62         //      error (_ ("I'm one myself"));
  63       }
  64   else
  65     ; //    error (_ ("none of these in my family"));
  66
  67 }
  68
  69 void
  70 Auto_change_iterator::do_process_and_next (Moment m)
  71 {
  72   Music_wrapper_iterator::do_process_and_next (m);
  73   Pitch_interrogate_req spanish_inquisition; // nobody expects it
  74
  75   Music_iterator *it = try_music (&spanish_inquisition);
  76
  77   if (it && spanish_inquisition.pitch_arr_.size ())
  78     {
  79       Musical_pitch p = spanish_inquisition.pitch_arr_[0];
  80       Direction s = Direction (sign(p.steps ()));
  81       if (s != where_dir_)
  82         {
  83           where_dir_ = s;
  84           String to_id =  (s >= 0) ?  "up" : "down";
  85           Auto_change_music const * auto_mus = dynamic_cast<Auto_change_music const* > (music_l_);
  86
  87           change_to (it, auto_mus->what_str_, to_id);
  88         }
  89     }
  90 }
  91
  92 Auto_change_iterator::Auto_change_iterator( )
  93 {
  94   where_dir_ = CENTER;
  95 }