lily/ottava-engraver.cc

   1 /*
   2   text-spanner-engraver.cc -- implement Ottava_spanner_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2004 Han-Wen Nienhuys
   7 */
   8
   9 #include "protected-scm.hh"
  10 #include "note-column.hh"
  11 #include "item.hh"
  12 #include "side-position-interface.hh"
  13 #include "engraver.hh"
  14
  15 class Ottava_spanner_engraver : public Engraver
  16 {
  17 public:
  18   TRANSLATOR_DECLARATIONS (Ottava_spanner_engraver);
  19 protected:
  20   virtual void finalize ();
  21   virtual void acknowledge_grob (Grob_info);
  22   virtual void process_music ();
  23   virtual void stop_translation_timestep ();
  24 private:
  25   Spanner *span_;
  26   Spanner *finished_;
  27
  28   Protected_scm last_ottavation_;
  29
  30   void typeset_all ();
  31 };
  32
  33
  34 Ottava_spanner_engraver::Ottava_spanner_engraver ()
  35 {
  36   finished_ = 0;
  37   span_ =0;
  38   last_ottavation_ = SCM_EOL;
  39 }
  40
  41 void
  42 Ottava_spanner_engraver::process_music ()
  43 {
  44   SCM ott = get_property ("ottavation");
  45   if (ott != last_ottavation_)
  46     {
  47       finished_= span_;
  48       span_ = 0;
  49       if (gh_string_p (ott))
  50         {
  51           span_  = make_spanner ("OttavaBracket");
  52           span_->set_property ("text", ott);
  53           announce_grob (span_, SCM_EOL);
  54
  55           SCM c0 (get_property ("middleCPosition"));
  56           SCM oc0 (get_property ("originalCentralCPosition"));
  57           if (scm_less_p (oc0, c0) == SCM_BOOL_T)
  58             span_->set_property ("direction", gh_int2scm (DOWN));
  59         }
  60     }
  61   last_ottavation_ = ott;
  62 }
  63
  64 void
  65 Ottava_spanner_engraver::acknowledge_grob (Grob_info info)
  66 {
  67   Item *it = dynamic_cast<Item*> (info.grob_);
  68   if (span_ && it && Note_column::has_interface (info.grob_))
  69     {
  70       Side_position_interface::add_support (span_, it);
  71
  72       if (!span_->get_bound (LEFT))
  73         span_->set_bound (LEFT, it);
  74       span_->set_bound (RIGHT, it);
  75     }
  76 }
  77
  78 void
  79 Ottava_spanner_engraver::typeset_all ()
  80 {
  81   if (finished_)
  82     {
  83       Direction d = LEFT;
  84       do
  85         {
  86           if (!finished_->get_bound (RIGHT))
  87             {
  88               Grob* e = unsmob_grob (get_property ("currentMusicalColumn"));
  89               finished_->set_bound (d, e);
  90             }
  91         }
  92       while (flip (&d) != LEFT);
  93
  94       typeset_grob (finished_);
  95       finished_ = 0;
  96     }
  97 }
  98
  99 void
 100 Ottava_spanner_engraver::stop_translation_timestep ()
 101 {
 102   if (span_ && !span_->get_bound (LEFT))
 103     {
 104       Grob* e = unsmob_grob (get_property ("currentMusicalColumn"));
 105       span_->set_bound (LEFT, e);
 106     }
 107
 108   typeset_all ();
 109 }
 110
 111 void
 112 Ottava_spanner_engraver::finalize ()
 113 {
 114   typeset_all ();
 115   if (span_)
 116     finished_ = span_;
 117   typeset_all ();
 118   last_ottavation_ = SCM_EOL;
 119 }
 120
 121 ENTER_DESCRIPTION (Ottava_spanner_engraver,
 122 /* descr */       "Create a text spanner when the ottavation property changes..",
 123 /* creats*/       "OttavaBracket",
 124 /* accepts */     "",
 125 /* acks  */      "note-column-interface",
 126 /* reads */       "ottavation",
 127 /* write */       "");