lily/separating-line-group-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1998--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "engraver.hh"
  21
  22 #include "separation-item.hh"
  23 #include "paper-column.hh"
  24 #include "output-def.hh"
  25 #include "axis-group-interface.hh"
  26 #include "note-spacing.hh"
  27 #include "accidental-placement.hh"
  28 #include "context.hh"
  29 #include "spanner.hh"
  30 #include "grob-array.hh"
  31 #include "pointer-group-interface.hh"
  32
  33 #include "translator.icc"
  34
  35 struct Spacings
  36 {
  37   Item *staff_spacing_;
  38   vector<Item *> note_spacings_;
  39
  40   Spacings ()
  41   {
  42     staff_spacing_ = 0;
  43   }
  44
  45   bool is_empty () const
  46   {
  47     return !staff_spacing_ && !note_spacings_.size ();
  48   }
  49   void clear ()
  50   {
  51     staff_spacing_ = 0;
  52     note_spacings_.clear ();
  53   }
  54 };
  55
  56 class Separating_line_group_engraver : public Engraver
  57 {
  58 protected:
  59   Spacings current_spacings_;
  60   Spacings last_spacings_;
  61
  62   void acknowledge_item (Grob_info);
  63   void acknowledge_break_aligned (Grob_info);
  64   void stop_translation_timestep ();
  65   void start_translation_timestep ();
  66
  67   vector<Grob *> break_aligned_;
  68 public:
  69   TRANSLATOR_DECLARATIONS (Separating_line_group_engraver);
  70 };
  71
  72 Separating_line_group_engraver::Separating_line_group_engraver (Context *c)
  73   : Engraver (c)
  74 {
  75 }
  76
  77 void
  78 Separating_line_group_engraver::acknowledge_item (Grob_info i)
  79 {
  80   Item *it = i.item ();
  81
  82   if (has_interface<Note_spacing> (it))
  83     {
  84       current_spacings_.note_spacings_.push_back (it);
  85       return;
  86     }
  87
  88   if (Item::is_non_musical (it)
  89       && !current_spacings_.staff_spacing_
  90       && to_boolean (get_property ("createSpacing")))
  91     {
  92       Grob *col = unsmob<Grob> (get_property ("currentCommandColumn"));
  93
  94       current_spacings_.staff_spacing_ = make_item ("StaffSpacing", SCM_EOL);
  95       context ()->set_property ("hasStaffSpacing", SCM_BOOL_T);
  96
  97       Pointer_group_interface::add_grob (current_spacings_.staff_spacing_,
  98                                          ly_symbol2scm ("left-items"),
  99                                          col);
 100
 101       if (!last_spacings_.note_spacings_.size ()
 102           && last_spacings_.staff_spacing_)
 103         {
 104           SCM ri = last_spacings_.staff_spacing_->get_object ("right-items");
 105           Grob_array *ga = unsmob<Grob_array> (ri);
 106           if (!ga)
 107             {
 108               SCM ga_scm = Grob_array::make_array ();
 109               last_spacings_.staff_spacing_->set_object ("right-items", ga_scm);
 110               ga = unsmob<Grob_array> (ga_scm);
 111             }
 112
 113           ga->clear ();
 114           ga->add (col);
 115         }
 116     }
 117 }
 118
 119 void
 120 Separating_line_group_engraver::acknowledge_break_aligned (Grob_info gi)
 121 {
 122   break_aligned_.push_back (gi.grob ());
 123 }
 124
 125 void
 126 Separating_line_group_engraver::start_translation_timestep ()
 127 {
 128   context ()->unset_property (ly_symbol2scm ("hasStaffSpacing"));
 129 }
 130
 131 void
 132 Separating_line_group_engraver::stop_translation_timestep ()
 133 {
 134   for (vsize i = 0; i < break_aligned_.size (); i++)
 135     {
 136       SCM smob = break_aligned_[i]->self_scm ();
 137
 138       if (Item *sp = current_spacings_.staff_spacing_)
 139         Pointer_group_interface::add_grob (sp, ly_symbol2scm ("left-break-aligned"), smob);
 140
 141       for (vsize j = 0; j < last_spacings_.note_spacings_.size (); j++)
 142         Pointer_group_interface::add_grob (last_spacings_.note_spacings_[j],
 143                                            ly_symbol2scm ("right-break-aligned"), smob);
 144     }
 145
 146   if (!current_spacings_.is_empty ())
 147     last_spacings_ = current_spacings_;
 148
 149   if (Item *sp = current_spacings_.staff_spacing_)
 150     if (Grob *col = unsmob<Grob> (get_property ("currentMusicalColumn")))
 151       Pointer_group_interface::add_grob (sp, ly_symbol2scm ("right-items"), col);
 152
 153   current_spacings_.clear ();
 154   break_aligned_.clear ();
 155 }
 156
 157
 158 void
 159 Separating_line_group_engraver::boot ()
 160 {
 161   ADD_ACKNOWLEDGER (Separating_line_group_engraver, item);
 162   ADD_ACKNOWLEDGER (Separating_line_group_engraver, break_aligned);
 163 }
 164
 165 ADD_TRANSLATOR (Separating_line_group_engraver,
 166                 /* doc */
 167                 "Generate objects for computing spacing parameters.",
 168
 169                 /* create */
 170                 "StaffSpacing ",
 171
 172                 /* read */
 173                 "createSpacing ",
 174
 175                 /* write */
 176                 "hasStaffSpacing "
 177                );