lily/g-script-column-engraver.cc

   1 /*
   2   g-script-column-engraver.cc --  implement G_script_column_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 "g-script-column.hh"
  12 #include "g-staff-side.hh"
  13
  14 /**
  15    Find potentially colliding scripts, and put them in a
  16    G_script_column, that will fix the collisions.  */
  17 class G_script_column_engraver : public Engraver
  18 {
  19   G_script_column *scol_p_;
  20   Link_array<Item> script_l_arr_;
  21   Link_array<G_staff_side_item> staff_side_l_arr_;
  22 public:
  23   G_script_column_engraver ();
  24   VIRTUAL_COPY_CONS(Translator);
  25 protected:
  26   virtual void acknowledge_element (Score_element_info);
  27   virtual void process_acknowledged ();
  28   virtual void  do_pre_move_processing ();
  29   virtual void  do_post_move_processing ();
  30 };
  31
  32
  33 G_script_column_engraver::G_script_column_engraver()
  34 {
  35   scol_p_ =0;
  36 }
  37
  38 void
  39 G_script_column_engraver::do_pre_move_processing ()
  40 {
  41   if (scol_p_)
  42     {
  43       typeset_element (scol_p_);
  44       scol_p_ =0;
  45     }
  46 }
  47
  48 void
  49 G_script_column_engraver::do_post_move_processing ()
  50 {
  51   script_l_arr_.clear ();
  52   staff_side_l_arr_.clear ();
  53 }
  54
  55 void
  56 G_script_column_engraver::acknowledge_element( Score_element_info inf)
  57 {
  58   Item *thing =  dynamic_cast<Item*>(inf.elem_l_);
  59   if (!thing)
  60     return;
  61
  62   Dimension_cache * parcache = thing->dim_cache_[Y_AXIS]->parent_l_;
  63   if (!parcache || !thing)
  64     return ;
  65
  66   Graphical_element *parent = parcache->element_l ();
  67
  68   if (G_staff_side_item * ss = dynamic_cast<G_staff_side_item*>(parent))
  69     {
  70       if (!ss->breakable_b ())
  71         {
  72           script_l_arr_.push (thing);
  73         }
  74     }
  75 }
  76
  77 void
  78 G_script_column_engraver::process_acknowledged ()
  79 {
  80   if (!scol_p_ && script_l_arr_.size () > 1)
  81     {
  82       scol_p_ = new G_script_column;
  83       announce_element (Score_element_info (scol_p_, 0));
  84     }
  85
  86   if (scol_p_)
  87     {
  88       for (int i=0; i < script_l_arr_.size (); i++)
  89         scol_p_->add_staff_sided (script_l_arr_[i]);
  90       script_l_arr_.clear ();
  91     }
  92 }
  93 ADD_THIS_TRANSLATOR(G_script_column_engraver);