lily/rest-collision-engraver.cc

   1 /*
   2   rest-collision-reg.cc -- implement Rest_collision_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "debug.hh"
  10 #include "rest-collision.hh"
  11 #include "engraver.hh"
  12 #include "collision.hh"
  13 #include "note-column.hh"
  14
  15 class Rest_collision_engraver : public Engraver
  16 {
  17   Item* rest_collision_p_;
  18
  19   Link_array<Grob> note_column_l_arr_;
  20 protected:
  21   virtual void acknowledge_grob (Grob_info);
  22   virtual void create_grobs ();
  23   virtual void stop_translation_timestep ();
  24 public:
  25   VIRTUAL_COPY_CONS (Translator);
  26   Rest_collision_engraver ();
  27
  28 };
  29
  30 ADD_THIS_TRANSLATOR (Rest_collision_engraver);
  31
  32 Rest_collision_engraver::Rest_collision_engraver ()
  33 {
  34   rest_collision_p_ =0;
  35 }
  36
  37 void
  38 Rest_collision_engraver::create_grobs ()
  39 {
  40   if (rest_collision_p_ || note_column_l_arr_.size () < 2)
  41     return;
  42
  43   rest_collision_p_ = new Item (get_property ("RestCollision"));
  44   Rest_collision::set_interface (rest_collision_p_);
  45   announce_grob (rest_collision_p_, 0);
  46   for (int i=0; i< note_column_l_arr_.size (); i++)
  47     Rest_collision::add_column (rest_collision_p_,note_column_l_arr_[i]);
  48 }
  49
  50 void
  51 Rest_collision_engraver::acknowledge_grob (Grob_info i)
  52 {
  53   if (Note_column::has_interface (i.elem_l_))
  54     note_column_l_arr_.push (i.elem_l_);
  55 }
  56
  57 void
  58 Rest_collision_engraver::stop_translation_timestep ()
  59 {
  60   if (rest_collision_p_)
  61     {
  62       typeset_grob (rest_collision_p_);
  63       rest_collision_p_ = 0;
  64     }
  65   note_column_l_arr_.clear ();
  66 }