lily/script-column-engraver.cc

   1 /*
   2   script-column-engraver.cc --  implement Script_column_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "engraver.hh"
  11 #include "script-column.hh"
  12 #include "item.hh"
  13 #include "side-position-interface.hh"
  14
  15 /**
  16    Find potentially colliding scripts, and put them in a
  17    Script_column, that will fix the collisions.  */
  18 class Script_column_engraver : public Engraver
  19 {
  20   Grob *scol_;
  21   Link_array<Item> scripts_;
  22
  23 public:
  24   TRANSLATOR_DECLARATIONS (Script_column_engraver);
  25 protected:
  26   virtual void acknowledge_grob (Grob_info);
  27   virtual void process_acknowledged_grobs ();
  28   virtual void stop_translation_timestep ();
  29 };
  30
  31
  32 Script_column_engraver::Script_column_engraver ()
  33 {
  34   scol_ =0;
  35 }
  36
  37 void
  38 Script_column_engraver::stop_translation_timestep ()
  39 {
  40   if (scol_)
  41     {
  42       typeset_grob (scol_);
  43       scol_ =0;
  44     }
  45   scripts_.clear ();
  46 }
  47
  48 void
  49 Script_column_engraver::acknowledge_grob (Grob_info inf)
  50 {
  51   Item *thing = dynamic_cast<Item*> (inf.grob_);
  52   if (thing && Side_position_interface::has_interface (inf.grob_)) // ugh FIXME
  53     {
  54       if (!Item::is_breakable (thing)
  55           && Side_position_interface::get_axis (inf.grob_) == Y_AXIS)
  56         {
  57           scripts_.push (thing);
  58         }
  59     }
  60 }
  61
  62 void
  63 Script_column_engraver::process_acknowledged_grobs ()
  64 {
  65   if (!scol_ && scripts_.size () > 1)
  66     {
  67       scol_ = make_item ("ScriptColumn");
  68       announce_grob (scol_, SCM_EOL);
  69     }
  70
  71   if (scol_)
  72     {
  73       for (int i=0; i < scripts_.size (); i++)
  74         Script_column::add_staff_sided (scol_, scripts_[i]);
  75       scripts_.clear ();
  76     }
  77
  78 }
  79
  80 ENTER_DESCRIPTION (Script_column_engraver,
  81 /* descr */       "",
  82 /* creats*/       "ScriptColumn",
  83 /* accepts */     "",
  84 /* acks  */      "side-position-interface",
  85 /* reads */       "",
  86 /* write */       "");