lily/grace-position-engraver.cc

   1 /*
   2   grace-position-engraver.cc --  implement Grace_position_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "engraver.hh"
  11 #include "grace-align-item.hh"
  12 #include "note-head.hh"
  13 #include "local-key-item.hh"
  14
  15 class Grace_position_engraver:public Engraver
  16 {
  17 protected:
  18   VIRTUAL_COPY_CONS(Translator);
  19   virtual void acknowledge_element (Score_element_info);
  20   virtual void process_acknowledged ();
  21   virtual void do_post_move_processing ();
  22   Grace_align_item*align_l_;
  23   Link_array<Item> support_;
  24 public:
  25   Grace_position_engraver();
  26 };
  27
  28
  29 Grace_position_engraver::Grace_position_engraver ()
  30 {
  31   align_l_ =0;
  32 }
  33
  34 void
  35 Grace_position_engraver::acknowledge_element (Score_element_info i)
  36 {
  37   if (Grace_align_item*g  =dynamic_cast<Grace_align_item*>(i.elem_l_))
  38     {
  39       align_l_ = g;
  40     }
  41   else if (Note_head * n = dynamic_cast <Note_head*> (i.elem_l_))
  42     {
  43       support_.push (n);
  44     }
  45   else if (Local_key_item*it = dynamic_cast<Local_key_item*>(i.elem_l_))
  46     {
  47       if (it->get_elt_property (grace_scm_sym) == SCM_BOOL_F)
  48         support_.push (it);
  49       else if (align_l_)
  50         it->add_dependency (align_l_);
  51     }
  52 }
  53
  54 void
  55 Grace_position_engraver::process_acknowledged ()
  56 {
  57   if (align_l_)
  58     {
  59       for (int i=0; i < support_.size (); i++)
  60         align_l_->add_support (support_[i]);
  61       support_.clear ();
  62     }
  63 }
  64
  65 void
  66 Grace_position_engraver::do_post_move_processing ()
  67 {
  68   support_.clear ();
  69   align_l_ =0;
  70 }
  71
  72 ADD_THIS_TRANSLATOR(Grace_position_engraver);