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 #include "note-spacing.hh"
  17
  18 class Separating_line_group_engraver : public Engraver
  19 {
  20 protected:
  21   Item * break_malt_p_;
  22   Item * musical_malt_p_;
  23   Item * last_musical_malt_p_;
  24
  25   Grob * last_note_spacing_;
  26   Grob * current_note_spacing_;
  27   Grob * staff_spacing_;
  28
  29   Spanner * sep_span_p_;
  30
  31   virtual void acknowledge_grob (Grob_info);
  32   virtual void initialize ();
  33   virtual void finalize ();
  34   virtual void stop_translation_timestep ();
  35 public:
  36   TRANSLATOR_DECLARATIONS(Separating_line_group_engraver);
  37 };
  38
  39 Separating_line_group_engraver::Separating_line_group_engraver ()
  40 {
  41   last_note_spacing_ = 0;
  42   current_note_spacing_ = 0;
  43   staff_spacing_ =0;
  44
  45   sep_span_p_ = 0;
  46   break_malt_p_ = 0;
  47   musical_malt_p_ =0;
  48 }
  49
  50 void
  51 Separating_line_group_engraver::initialize ()
  52 {
  53   sep_span_p_ = new Spanner (get_property ("SeparatingGroupSpanner"));
  54
  55   announce_grob (sep_span_p_, 0);
  56   sep_span_p_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
  57 }
  58
  59 void
  60 Separating_line_group_engraver::finalize ()
  61 {
  62   sep_span_p_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
  63   typeset_grob (sep_span_p_);
  64   sep_span_p_ =0;
  65 }
  66
  67 void
  68 Separating_line_group_engraver::acknowledge_grob (Grob_info i)
  69 {
  70   Item * it = dynamic_cast <Item *> (i.grob_l_);
  71   if (!it)
  72     return;
  73   if (it->get_parent (X_AXIS)
  74       && it->get_parent (X_AXIS)
  75       ->has_extent_callback_b(Axis_group_interface::group_extent_callback_proc, X_AXIS))
  76     return;
  77
  78   if (Note_spacing::has_interface (it))
  79     {
  80       current_note_spacing_ =  it;
  81       return ;
  82     }
  83
  84   bool ib =Item::breakable_b (it);
  85   Item *&p_ref_ (ib ? break_malt_p_
  86                  : musical_malt_p_);
  87
  88   if (!p_ref_)
  89     {
  90       p_ref_ = new Item (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       if (p_ref_ == break_malt_p_)
  97         {
  98           staff_spacing_ = new Item (get_property ("StaffSpacing"));
  99           staff_spacing_->set_grob_property ("left-item", break_malt_p_->self_scm ());
 100           announce_grob (staff_spacing_, 0);
 101
 102           if (last_note_spacing_)
 103             last_note_spacing_->set_grob_property ("right-item",
 104                                                    break_malt_p_->self_scm ());
 105         }
 106     }
 107
 108   Separation_item::add_item (p_ref_,it);
 109 }
 110
 111 void
 112 Separating_line_group_engraver::stop_translation_timestep ()
 113 {
 114   if (break_malt_p_)
 115     {
 116       Separating_group_spanner::add_spacing_unit (sep_span_p_, break_malt_p_);
 117       typeset_grob (break_malt_p_);
 118
 119       break_malt_p_ =0;
 120     }
 121
 122   if (staff_spacing_)
 123     {
 124       if (musical_malt_p_)
 125         staff_spacing_->set_grob_property ("right-item", musical_malt_p_->self_scm());
 126
 127       typeset_grob (staff_spacing_);
 128       staff_spacing_ = 0;
 129     }
 130
 131   if (musical_malt_p_)
 132     {
 133       Separating_group_spanner::add_spacing_unit (sep_span_p_, musical_malt_p_);
 134       typeset_grob (musical_malt_p_);
 135     }
 136
 137   last_note_spacing_ = current_note_spacing_ ;
 138   current_note_spacing_ =0 ;
 139
 140   musical_malt_p_ =0;
 141 }
 142
 143
 144
 145
 146
 147 ENTER_DESCRIPTION(Separating_line_group_engraver,
 148 /* descr */       "Generates objects for computing spacing parameters.",
 149 /* creats*/       "SeparationItem SeparatingGroupSpanner",
 150 /* acks  */       "grob-interface",
 151 /* reads */       "",
 152 /* write */       "");