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--2003 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 start_translation_timestep ();
  24   virtual void process_music ();
  25
  26 private:
  27   Spanner *span_;
  28   Spanner *finished_;
  29   Music *current_req_;
  30   Drul_array<Music*> req_drul_;
  31   void typeset_all ();
  32 };
  33
  34
  35 Text_spanner_engraver::Text_spanner_engraver ()
  36 {
  37   finished_ = 0;
  38   current_req_ = 0;
  39   span_ =0;
  40   req_drul_[START] = 0;
  41   req_drul_[STOP] = 0;
  42 }
  43
  44 void
  45 Text_spanner_engraver::start_translation_timestep ()
  46 {
  47   req_drul_[START] = 0;
  48   req_drul_[STOP] = 0;
  49 }
  50
  51 bool
  52 Text_spanner_engraver::try_music (Music *m)
  53 {
  54   if (m->is_mus_type ("text-span-event"))
  55     {
  56
  57       Direction d = to_dir (m->get_mus_property ("span-direction"));
  58       req_drul_[d] = m;
  59       return true;
  60     }
  61   else if (m->is_mus_type ("abort-event"))
  62     {
  63       req_drul_[LEFT] = 0;
  64       req_drul_[RIGHT] = 0;
  65       if (span_)
  66         span_->suicide ();
  67       span_ = 0;
  68     }
  69
  70   return false;
  71 }
  72
  73 void
  74 Text_spanner_engraver::process_music ()
  75 {
  76   if (req_drul_[STOP])
  77     {
  78       if (!span_)
  79         {
  80           req_drul_[STOP]->origin ()->warning
  81  (_ ("can't find start of text spanner"));
  82         }
  83       else
  84         {
  85           finished_ = span_;
  86           span_ = 0;
  87           current_req_ = 0;
  88         }
  89     }
  90
  91   if (req_drul_[START])
  92     {
  93       if (current_req_)
  94         {
  95           req_drul_[START]->origin ()->warning(_ ("already have a text spanner"));
  96         }
  97       else
  98         {
  99           current_req_ = req_drul_[START];
 100           span_  = new Spanner (get_property ("TextSpanner"));
 101
 102 #if 0
 103           /* Ugh.  Reset (de)cresc. specific properties */
 104           span_->set_grob_property ("enclose-bounds", SCM_BOOL_T);
 105           span_->set_grob_property ("if-text-padding", gh_double2scm (0));
 106           span_->set_grob_property ("width-correct", gh_double2scm (0));
 107 #endif
 108
 109           Side_position_interface::set_axis (span_, Y_AXIS);
 110           announce_grob (span_, req_drul_[START]->self_scm());
 111           req_drul_[START] = 0;
 112         }
 113     }
 114 }
 115
 116 void
 117 Text_spanner_engraver::acknowledge_grob (Grob_info info)
 118 {
 119   Spanner * spans[2] ={span_, finished_};
 120   for (int i = 0;  i < 2 ; i++)
 121     {
 122       if (spans[i] && Note_column::has_interface (info.grob_))
 123         {
 124           Side_position_interface::add_support (spans[i], info.grob_);
 125           add_bound_item (spans[i], dynamic_cast<Item*> (info.grob_));
 126         }
 127     }
 128 }
 129
 130 void
 131 Text_spanner_engraver::typeset_all ()
 132 {
 133   if (finished_)
 134     {
 135       Side_position_interface::add_staff_support (finished_);
 136       if (!finished_->get_bound (RIGHT))
 137         {
 138           Grob* e = unsmob_grob (get_property ("currentMusicalColumn"));
 139           finished_->set_bound (RIGHT, e);
 140         }
 141       typeset_grob (finished_);
 142       finished_ = 0;
 143     }
 144 }
 145
 146 void
 147 Text_spanner_engraver::stop_translation_timestep ()
 148 {
 149   if (span_ && !span_->get_bound (LEFT))
 150     {
 151       Grob* e = unsmob_grob (get_property ("currentMusicalColumn"));
 152       span_->set_bound (LEFT, e);
 153     }
 154
 155   typeset_all ();
 156 }
 157
 158 void
 159 Text_spanner_engraver::finalize ()
 160 {
 161   typeset_all ();
 162   if (span_)
 163     {
 164       current_req_->origin ()->warning (_ ("unterminated text spanner"));
 165       span_->suicide ();
 166       span_ = 0;
 167     }
 168 }
 169
 170 ENTER_DESCRIPTION(Text_spanner_engraver,
 171 /* descr */       "Create text spanner from a Music.",
 172 /* creats*/       "TextSpanner",
 173 /* accepts */     "text-span-event",
 174 /* acks  */      "note-column-interface",
 175 /* reads */       "",
 176 /* write */       "");