lily/text-spanner-engraver.cc

   1 /*
   2   text-spanner-engraver.cc -- implement Text_spanner_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2004 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "note-column.hh"
  10 #include "item.hh"
  11 #include "side-position-interface.hh"
  12 #include "engraver.hh"
  13
  14 class Text_spanner_engraver : public Engraver
  15 {
  16 public:
  17   TRANSLATOR_DECLARATIONS (Text_spanner_engraver);
  18 protected:
  19   virtual void finalize ();
  20   virtual void acknowledge_grob (Grob_info);
  21   virtual bool try_music (Music *);
  22   virtual void stop_translation_timestep ();
  23   virtual void process_music ();
  24
  25 private:
  26   Spanner *span_;
  27   Spanner *finished_;
  28   Music *current_req_;
  29   Drul_array<Music*> req_drul_;
  30   void typeset_all ();
  31 };
  32
  33
  34 Text_spanner_engraver::Text_spanner_engraver ()
  35 {
  36   finished_ = 0;
  37   current_req_ = 0;
  38   span_ =0;
  39   req_drul_[START] = 0;
  40   req_drul_[STOP] = 0;
  41 }
  42
  43 bool
  44 Text_spanner_engraver::try_music (Music *m)
  45 {
  46   if (m->is_mus_type ("text-span-event"))
  47     {
  48
  49       Direction d = to_dir (m->get_property ("span-direction"));
  50       req_drul_[d] = m;
  51       return true;
  52     }
  53
  54   return false;
  55 }
  56
  57 void
  58 Text_spanner_engraver::process_music ()
  59 {
  60   if (req_drul_[STOP])
  61     {
  62       if (!span_)
  63         {
  64           req_drul_[STOP]->origin ()->warning
  65  (_ ("can't find start of text spanner"));
  66         }
  67       else
  68         {
  69           finished_ = span_;
  70           span_ = 0;
  71           current_req_ = 0;
  72         }
  73     }
  74
  75   if (req_drul_[START])
  76     {
  77       if (current_req_)
  78         {
  79           req_drul_[START]->origin ()->warning (_ ("already have a text spanner"));
  80         }
  81       else
  82         {
  83           current_req_ = req_drul_[START];
  84           span_  = make_spanner ("TextSpanner", req_drul_[START]->self_scm ());
  85
  86
  87           Side_position_interface::set_axis (span_, Y_AXIS);
  88           req_drul_[START] = 0;
  89         }
  90     }
  91 }
  92
  93 void
  94 Text_spanner_engraver::acknowledge_grob (Grob_info info)
  95 {
  96   Spanner * spans[2] ={span_, finished_};
  97   for (int i = 0;  i < 2 ; i++)
  98     {
  99       if (spans[i] && Note_column::has_interface (info.grob_))
 100         {
 101           Side_position_interface::add_support (spans[i], info.grob_);
 102           add_bound_item (spans[i], dynamic_cast<Item*> (info.grob_));
 103         }
 104     }
 105 }
 106
 107 void
 108 Text_spanner_engraver::typeset_all ()
 109 {
 110   if (finished_)
 111     {
 112       if (!finished_->get_bound (RIGHT))
 113         {
 114           Grob* e = unsmob_grob (get_property ("currentMusicalColumn"));
 115           finished_->set_bound (RIGHT, e);
 116         }
 117       finished_ = 0;
 118     }
 119 }
 120
 121 void
 122 Text_spanner_engraver::stop_translation_timestep ()
 123 {
 124   if (span_ && !span_->get_bound (LEFT))
 125     {
 126       Grob* e = unsmob_grob (get_property ("currentMusicalColumn"));
 127       span_->set_bound (LEFT, e);
 128     }
 129
 130   typeset_all ();
 131   req_drul_[START] = 0;
 132   req_drul_[STOP] = 0;
 133 }
 134
 135 void
 136 Text_spanner_engraver::finalize ()
 137 {
 138   typeset_all ();
 139   if (span_)
 140     {
 141       current_req_->origin ()->warning (_ ("unterminated text spanner"));
 142       span_->suicide ();
 143       span_ = 0;
 144     }
 145 }
 146
 147 ENTER_DESCRIPTION (Text_spanner_engraver,
 148 /* descr */       "Create text spanner from a Music.",
 149 /* creats*/       "TextSpanner",
 150 /* accepts */     "text-span-event",
 151 /* acks  */      "note-column-interface",
 152 /* reads */       "",
 153 /* write */       "");