lily/trill-spanner-engraver.cc

   1 /*
   2   trill-spanner-engraver.cc -- implement Trill_spanner_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2006 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 /*
  10   C&P from text-spanner.cc
  11
  12   - todo: ending should be detected automatically? a new note
  13   automatically is the end of the trill?
  14 */
  15
  16 #include "engraver.hh"
  17
  18 #include "international.hh"
  19 #include "note-column.hh"
  20 #include "side-position-interface.hh"
  21 #include "stream-event.hh"
  22
  23 #include "translator.icc"
  24
  25 class Trill_spanner_engraver : public Engraver
  26 {
  27 public:
  28   TRANSLATOR_DECLARATIONS (Trill_spanner_engraver);
  29 protected:
  30   virtual void finalize ();
  31   DECLARE_ACKNOWLEDGER (note_column);
  32   DECLARE_TRANSLATOR_LISTENER (trill_span);
  33   void stop_translation_timestep ();
  34   void process_music ();
  35
  36 private:
  37   Spanner *span_;
  38   Spanner *finished_;
  39   Stream_event *current_event_;
  40   Drul_array<Stream_event *> event_drul_;
  41   void typeset_all ();
  42 };
  43
  44 Trill_spanner_engraver::Trill_spanner_engraver ()
  45 {
  46   finished_ = 0;
  47   current_event_ = 0;
  48   span_ = 0;
  49   event_drul_[START] = 0;
  50   event_drul_[STOP] = 0;
  51 }
  52
  53 IMPLEMENT_TRANSLATOR_LISTENER (Trill_spanner_engraver, trill_span);
  54 void
  55 Trill_spanner_engraver::listen_trill_span (Stream_event *ev)
  56 {
  57   Direction d = to_dir (ev->get_property ("span-direction"));
  58   ASSIGN_EVENT_ONCE (event_drul_[d], ev);
  59 }
  60
  61 void
  62 Trill_spanner_engraver::process_music ()
  63 {
  64   if (event_drul_[STOP])
  65     {
  66       if (!span_)
  67         event_drul_[STOP]->origin ()->warning (_ ("can't find start of trill spanner"));
  68       else
  69         {
  70           finished_ = span_;
  71           span_ = 0;
  72           current_event_ = 0;
  73         }
  74     }
  75
  76   if (event_drul_[START])
  77     {
  78       if (current_event_)
  79         event_drul_[START]->origin ()->warning (_ ("already have a trill spanner"));
  80       else
  81         {
  82           current_event_ = event_drul_[START];
  83           span_ = make_spanner ("TrillSpanner", event_drul_[START]->self_scm ());
  84           Side_position_interface::set_axis (span_, Y_AXIS);
  85           event_drul_[START] = 0;
  86         }
  87     }
  88 }
  89
  90 void
  91 Trill_spanner_engraver::acknowledge_note_column (Grob_info info)
  92 {
  93   Spanner *spans[2] ={span_, finished_};
  94   for (int i = 0; i < 2; i++)
  95     {
  96       if (spans[i])
  97         {
  98           Side_position_interface::add_support (spans[i], info.grob ());
  99           add_bound_item (spans[i], dynamic_cast<Item *> (info.grob ()));
 100         }
 101     }
 102 }
 103
 104 void
 105 Trill_spanner_engraver::typeset_all ()
 106 {
 107   if (finished_)
 108     {
 109       if (!finished_->get_bound (RIGHT))
 110         {
 111           Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
 112           finished_->set_bound (RIGHT, e);
 113         }
 114       finished_ = 0;
 115     }
 116 }
 117
 118 void
 119 Trill_spanner_engraver::stop_translation_timestep ()
 120 {
 121   if (span_ && !span_->get_bound (LEFT))
 122     {
 123       Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
 124       span_->set_bound (LEFT, e);
 125     }
 126
 127   typeset_all ();
 128   event_drul_[START] = 0;
 129   event_drul_[STOP] = 0;
 130 }
 131
 132 void
 133 Trill_spanner_engraver::finalize ()
 134 {
 135   typeset_all ();
 136   if (span_)
 137     {
 138       finished_ = span_;
 139       typeset_all ();
 140     }
 141 }
 142
 143 ADD_ACKNOWLEDGER (Trill_spanner_engraver, note_column);
 144 ADD_TRANSLATOR (Trill_spanner_engraver,
 145                 /* doc */ "Create trill spanner from an event.",
 146                 /* create */ "TrillSpanner",
 147                 /* accept */ "trill-span-event",
 148                 /* read */ "",
 149                 /* write */ "");