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--2003 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   virtual void start_translation_timestep ();
  30 };
  31
  32
  33 Script_column_engraver::Script_column_engraver ()
  34 {
  35   scol_ =0;
  36 }
  37
  38 void
  39 Script_column_engraver::stop_translation_timestep ()
  40 {
  41   if (scol_)
  42     {
  43       typeset_grob (scol_);
  44       scol_ =0;
  45     }
  46 }
  47
  48 void
  49 Script_column_engraver::start_translation_timestep ()
  50 {
  51   scripts_.clear ();
  52
  53 }
  54
  55 void
  56 Script_column_engraver::acknowledge_grob (Grob_info inf)
  57 {
  58   Item *thing = dynamic_cast<Item*> (inf.grob_);
  59   if (thing && Side_position_interface::has_interface (inf.grob_)) // ugh FIXME
  60     {
  61       if (!Item::breakable_b (thing)
  62           && Side_position_interface::get_axis (inf.grob_) == Y_AXIS)
  63         {
  64           scripts_.push (thing);
  65         }
  66     }
  67 }
  68
  69 void
  70 Script_column_engraver::process_acknowledged_grobs ()
  71 {
  72   if (!scol_ && scripts_.size () > 1)
  73     {
  74       scol_ = new Item (get_property ("ScriptColumn"));
  75       announce_grob(scol_, SCM_EOL);
  76     }
  77
  78   if (scol_)
  79     {
  80       for (int i=0; i < scripts_.size (); i++)
  81         Script_column::add_staff_sided (scol_, scripts_[i]);
  82       scripts_.clear ();
  83     }
  84
  85 }
  86
  87 ENTER_DESCRIPTION(Script_column_engraver,
  88 /* descr */       "",
  89 /* creats*/       "ScriptColumn",
  90 /* accepts */     "",
  91 /* acks  */      "side-position-interface",
  92 /* reads */       "",
  93 /* write */       "");