lily/line-number-engraver.cc

   1 /*
   2   line-number-engraver.cc --  implement  Line_number_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "engraver.hh"
  11 #include "item.hh"
  12 #include "side-position-interface.hh"
  13 #include "rhythmic-head.hh"
  14 #include "stem.hh"
  15 #include "note-head.hh"
  16
  17 /**
  18    Annotate output with line numbers. Creates text-items when it
  19    catches note heads.  */
  20 class Line_number_engraver : public Engraver
  21 {
  22   Array<Score_element_info> interesting_;
  23   Link_array<Score_element> support_;
  24   Item * text_item_p_;
  25   String last_text_;
  26 public:
  27   Line_number_engraver ();
  28   VIRTUAL_COPY_CONS (Translator);
  29 protected:
  30   virtual void do_pre_move_processing ();
  31   virtual void acknowledge_element (Score_element_info);
  32   virtual void process_acknowledged ();
  33 };
  34
  35 void
  36 Line_number_engraver::process_acknowledged ()
  37 {
  38   if (!text_item_p_ && interesting_.size ())
  39     {
  40       text_item_p_ = new Item (get_property ("basicTextProperties") );
  41       Side_position::set_axis (text_item_p_,Y_AXIS);
  42       Side_position::set_direction (text_item_p_, UP);
  43       text_item_p_->set_parent (interesting_[0].elem_l_, Y_AXIS);
  44
  45
  46       announce_element (text_item_p_, 0);
  47     }
  48 }
  49
  50 void
  51 Line_number_engraver::acknowledge_element (Score_element_info inf)
  52 {
  53   if (!inf.req_l_)
  54     return ;
  55
  56   if ( Note_head::has_interface (inf.elem_l_))
  57     {
  58       interesting_.push (inf);
  59       support_.push (inf.elem_l_);
  60     }
  61   else if (Stem::has_interface (inf.elem_l_))
  62     {
  63       support_.push (inf.elem_l_);
  64     }
  65 }
  66
  67 void
  68 Line_number_engraver::do_pre_move_processing ()
  69 {
  70   if (text_item_p_)
  71     {
  72       String s;
  73
  74       for (int i=0; i < interesting_.size (); i++)
  75         {
  76           if (i)
  77             s += ",";
  78
  79           s += interesting_[i].req_l_->origin ()->line_number_str ();
  80
  81         }
  82
  83       for (int j= support_.size (); j--; )
  84         {
  85           Side_position::add_support (text_item_p_,support_[j]);
  86         }
  87       if (s != last_text_)
  88         {
  89           text_item_p_->set_elt_property ("text", ly_str02scm (s.ch_C()));
  90           last_text_ =s;
  91         }
  92
  93       typeset_element (text_item_p_);
  94       text_item_p_ =0;
  95     }
  96   interesting_.clear ();
  97   support_.clear ();
  98 }
  99
 100 Line_number_engraver::Line_number_engraver ()
 101 {
 102   text_item_p_ =0;
 103 }
 104
 105 ADD_THIS_TRANSLATOR(Line_number_engraver);