lily/separating-line-group-engraver.cc

   1 /*
   2 '  separating-line-group-engraver.cc --  implement Separating_line_group_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9 #include <iostream.h>
  10
  11 #include "separating-group-spanner.hh"
  12 #include "separation-item.hh"
  13 #include "paper-column.hh"
  14 #include "paper-def.hh"
  15 #include "engraver.hh"
  16 #include "axis-group-interface.hh"
  17
  18 class Separating_line_group_engraver : public Engraver
  19 {
  20 protected:
  21   Item * break_malt_p_;
  22   Item * musical_malt_p_;
  23
  24   /*
  25     malt_p_ : we used to have a Single_malt_grouping_item
  26
  27    */
  28   Item * last_step_musical_malt_p_;
  29   Item * last_nonnil_musical_malt_p_;
  30   Item * last_nonnil_break_malt_p_;
  31
  32   Spanner * sep_span_p_;
  33
  34   virtual void acknowledge_grob (Grob_info);
  35   virtual void initialize ();
  36   virtual void finalize ();
  37   virtual void stop_translation_timestep ();
  38 public:
  39   Separating_line_group_engraver ();
  40   VIRTUAL_COPY_CONS (Translator);
  41 };
  42
  43 Separating_line_group_engraver::Separating_line_group_engraver ()
  44 {
  45   last_step_musical_malt_p_ = 0;
  46   last_nonnil_break_malt_p_ = 0;
  47   last_nonnil_musical_malt_p_ = 0;
  48
  49   sep_span_p_ = 0;
  50   break_malt_p_ = 0;
  51   musical_malt_p_ =0;
  52 }
  53
  54 void
  55 Separating_line_group_engraver::initialize ()
  56 {
  57   sep_span_p_ = new Spanner (get_property ("SeparatingGroupSpanner"));
  58
  59   announce_grob (sep_span_p_, 0);
  60   sep_span_p_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
  61 }
  62
  63 void
  64 Separating_line_group_engraver::finalize ()
  65 {
  66   sep_span_p_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
  67   typeset_grob (sep_span_p_);
  68   sep_span_p_ =0;
  69 }
  70
  71 void
  72 Separating_line_group_engraver::acknowledge_grob (Grob_info i)
  73 {
  74   Item * it = dynamic_cast <Item *> (i.elem_l_);
  75   if (!it)
  76     return;
  77   if (it->parent_l (X_AXIS)
  78       && it->parent_l (X_AXIS)->has_extent_callback_b
  79  (Axis_group_interface::group_extent_callback_proc, X_AXIS))
  80     return;
  81
  82
  83   bool ib =Item::breakable_b (it);
  84   Item *&p_ref_ (ib ? break_malt_p_
  85                  : musical_malt_p_);
  86
  87   if (!p_ref_)
  88     {
  89       p_ref_ = new Item
  90  (get_property ("SeparationItem"));
  91
  92       if (ib)
  93         p_ref_->set_grob_property ("breakable", SCM_BOOL_T);
  94       announce_grob (p_ref_, 0);
  95     }
  96   Separation_item::add_item (p_ref_,it);
  97 }
  98
  99 void
 100 Separating_line_group_engraver::stop_translation_timestep ()
 101 {
 102   if (break_malt_p_)
 103     {
 104       Separating_group_spanner::add_spacing_unit (sep_span_p_, break_malt_p_);
 105
 106       typeset_grob (break_malt_p_);
 107
 108       last_nonnil_break_malt_p_ = break_malt_p_;
 109       break_malt_p_ =0;
 110     }
 111
 112   if (musical_malt_p_)
 113     {
 114       Separating_group_spanner::add_spacing_unit (sep_span_p_, musical_malt_p_);
 115
 116
 117       /* TODO
 118
 119          move this mucketry into separation-spanner.
 120
 121        */
 122       if (last_nonnil_break_malt_p_ && last_nonnil_musical_malt_p_)
 123         {
 124           cout << now_mom ().str () <<endl;
 125           Item *col =     last_nonnil_break_malt_p_->column_l();
 126           if (!col)
 127             col = dynamic_cast<Item*> (unsmob_grob (get_property ("currentCommandColumn")));
 128
 129           SCM between = col->get_grob_property ("between-cols");
 130
 131           SCM left = last_nonnil_musical_malt_p_->column_l()->self_scm ();
 132           SCM right = get_property ("currentMusicalColumn"); // musical_malt_p_->column_l()->self_scm ();
 133           if (gh_pair_p (between))
 134             {
 135               /*
 136                 ugh. set_..._x ()
 137                */
 138               if (Paper_column::rank_i (unsmob_grob (gh_car (between))) < Paper_column::rank_i (unsmob_grob (left)))
 139                 gh_set_car_x (between, left);
 140               if (Paper_column::rank_i (unsmob_grob (gh_cdr (between))) > Paper_column::rank_i (unsmob_grob (right)))
 141                 gh_set_cdr_x (between, right);
 142             }
 143           else
 144             {
 145               col->set_grob_property ("between-cols", gh_cons (left, right));
 146             }
 147         }
 148
 149       if (last_step_musical_malt_p_)
 150         {
 151           Paper_column *col =
 152             last_step_musical_malt_p_->column_l();
 153           SCM newtup = gh_cons (last_step_musical_malt_p_->self_scm (),
 154                                 musical_malt_p_->self_scm ());
 155           col->set_grob_property ("spacing-sequence",
 156                                   gh_cons (newtup,
 157                                            col->get_grob_property ("spacing-sequence")));
 158         }
 159
 160
 161
 162       last_nonnil_break_malt_p_ = 0;
 163       last_nonnil_musical_malt_p_ = musical_malt_p_;
 164       typeset_grob (musical_malt_p_);
 165     }
 166   last_step_musical_malt_p_ = musical_malt_p_;
 167   musical_malt_p_ =0;
 168
 169 }
 170
 171
 172
 173 ADD_THIS_TRANSLATOR (Separating_line_group_engraver);
 174