lily/arpeggio-engraver.cc

   1 /*
   2   arpeggio-engraver.cc -- implement Arpeggio_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2005 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "engraver.hh"
  10
  11 #include "pointer-group-interface.hh"
  12 #include "arpeggio.hh"
  13 #include "stem.hh"
  14 #include "rhythmic-head.hh"
  15 #include "side-position-interface.hh"
  16 #include "note-column.hh"
  17
  18 #include "translator.icc"
  19
  20 class Arpeggio_engraver : public Engraver
  21 {
  22 public:
  23   TRANSLATOR_DECLARATIONS (Arpeggio_engraver);
  24
  25   void acknowledge_stem (Grob_info);
  26   void acknowledge_rhythmic_head (Grob_info);
  27   void acknowledge_note_column (Grob_info);
  28 protected:
  29   void process_music ();
  30   void stop_translation_timestep ();
  31   virtual bool try_music (Music *);
  32 private:
  33   Item *arpeggio_;
  34   Music *arpeggio_event_;
  35 };
  36
  37 Arpeggio_engraver::Arpeggio_engraver ()
  38 {
  39   arpeggio_ = 0;
  40   arpeggio_event_ = 0;
  41 }
  42
  43 bool
  44 Arpeggio_engraver::try_music (Music *m)
  45 {
  46   if (!arpeggio_event_)
  47     {
  48       arpeggio_event_ = m;
  49     }
  50   return true;
  51 }
  52
  53 void
  54 Arpeggio_engraver::acknowledge_stem (Grob_info info)
  55 {
  56   if (arpeggio_)
  57     {
  58       if (!arpeggio_->get_parent (Y_AXIS))
  59         arpeggio_->set_parent (info.grob (), Y_AXIS);
  60
  61       Pointer_group_interface::add_grob (arpeggio_,
  62                                          ly_symbol2scm ("stems"),
  63                                          info.grob ());
  64     }
  65 }
  66 void
  67 Arpeggio_engraver::acknowledge_rhythmic_head (Grob_info info)
  68 {
  69   if (arpeggio_)
  70
  71     /*
  72       We can't catch local key items (accidentals) from Voice context,
  73       see Local_key_engraver
  74     */
  75     {
  76       Side_position_interface::add_support (arpeggio_, info.grob ());
  77     }
  78 }
  79
  80 void
  81 Arpeggio_engraver::acknowledge_note_column (Grob_info info)
  82 {
  83   if (arpeggio_)
  84     {
  85       info.grob ()->set_object ("arpeggio", arpeggio_->self_scm ());
  86     }
  87 }
  88
  89 void
  90 Arpeggio_engraver::process_music ()
  91 {
  92   if (arpeggio_event_)
  93     {
  94       arpeggio_ = make_item ("Arpeggio", arpeggio_event_->self_scm ());
  95     }
  96 }
  97
  98 void
  99 Arpeggio_engraver::stop_translation_timestep ()
 100 {
 101   arpeggio_ = 0;
 102   arpeggio_event_ = 0;
 103 }
 104
 105 ADD_ACKNOWLEDGER (Arpeggio_engraver, stem)
 106   ADD_ACKNOWLEDGER (Arpeggio_engraver, rhythmic_head)
 107   ADD_ACKNOWLEDGER (Arpeggio_engraver, note_column)
 108
 109   ADD_TRANSLATOR (Arpeggio_engraver,
 110                   /* doc */ "Generate an Arpeggio symbol",
 111                   /* create */ "Arpeggio",
 112                   /* accept */ "arpeggio-event",
 113                   /* read */ "",
 114                   /* write */ "");