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
  10 #include "separating-group-spanner.hh"
  11 #include "separation-item.hh"
  12 #include "paper-column.hh"
  13 #include "paper-def.hh"
  14 #include "engraver.hh"
  15 #include "axis-group-interface.hh"
  16
  17 class Separating_line_group_engraver : public Engraver
  18 {
  19 protected:
  20   Item * break_malt_p_;
  21   Item * nobreak_malt_p_;
  22   Spanner * sep_span_p_;
  23
  24   virtual void acknowledge_grob (Grob_info);
  25   virtual void initialize ();
  26   virtual void finalize ();
  27   virtual void stop_translation_timestep ();
  28 public:
  29   Separating_line_group_engraver ();
  30   VIRTUAL_COPY_CONS (Translator);
  31 };
  32
  33 Separating_line_group_engraver::Separating_line_group_engraver ()
  34 {
  35   sep_span_p_ = 0;
  36   break_malt_p_ = 0;
  37   nobreak_malt_p_ =0;
  38 }
  39
  40 void
  41 Separating_line_group_engraver::initialize ()
  42 {
  43   sep_span_p_ = new Spanner (get_property ("SeparatingGroupSpanner"));
  44
  45   announce_grob (sep_span_p_, 0);
  46   sep_span_p_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
  47 }
  48
  49 void
  50 Separating_line_group_engraver::finalize ()
  51 {
  52   sep_span_p_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
  53   typeset_grob (sep_span_p_);
  54   sep_span_p_ =0;
  55 }
  56
  57 void
  58 Separating_line_group_engraver::acknowledge_grob (Grob_info i)
  59 {
  60   Item * it = dynamic_cast <Item *> (i.elem_l_);
  61   if (!it)
  62     return;
  63   if (it->parent_l (X_AXIS)
  64       && it->parent_l (X_AXIS)->has_extent_callback_b
  65  (Axis_group_interface::group_extent_callback_proc, X_AXIS))
  66     return;
  67
  68
  69   bool ib =Item::breakable_b (it);
  70   Item *&p_ref_ (ib ? break_malt_p_
  71                  : nobreak_malt_p_);
  72
  73   if (!p_ref_)
  74     {
  75       p_ref_ = new Item
  76  (get_property ("SeparationItem"));
  77
  78       if (ib)
  79         p_ref_->set_grob_property ("breakable", SCM_BOOL_T);
  80       announce_grob (p_ref_, 0);
  81     }
  82   Separation_item::add_item (p_ref_,it);
  83 }
  84
  85 void
  86 Separating_line_group_engraver::stop_translation_timestep ()
  87 {
  88   if (break_malt_p_)
  89     {
  90       Separating_group_spanner::add_spacing_unit (sep_span_p_, break_malt_p_);
  91
  92       typeset_grob (break_malt_p_);
  93       break_malt_p_ =0;
  94     }
  95   if (nobreak_malt_p_)
  96     {
  97       Separating_group_spanner::add_spacing_unit (sep_span_p_, nobreak_malt_p_);
  98       typeset_grob (nobreak_malt_p_);
  99       nobreak_malt_p_ =0;
 100     }
 101 }
 102
 103
 104
 105 ADD_THIS_TRANSLATOR (Separating_line_group_engraver);
 106