lily/script-column-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1999--2011 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 #include "script-column.hh"
  22 #include "side-position-interface.hh"
  23 #include "item.hh"
  24
  25 #include "translator.icc"
  26
  27 /**
  28    Find potentially colliding scripts, and put them in a
  29    Script_column, that will fix the collisions.  */
  30 class Script_column_engraver : public Engraver
  31 {
  32   Grob *script_column_;
  33   vector<Grob*> scripts_;
  34
  35 public:
  36   TRANSLATOR_DECLARATIONS (Script_column_engraver);
  37 protected:
  38   DECLARE_ACKNOWLEDGER (side_position);
  39   void process_acknowledged ();
  40   void stop_translation_timestep ();
  41 };
  42
  43 Script_column_engraver::Script_column_engraver ()
  44 {
  45   script_column_ = 0;
  46 }
  47
  48 void
  49 Script_column_engraver::stop_translation_timestep ()
  50 {
  51   if (script_column_)
  52     {
  53       for (vsize i = 0; i < scripts_.size (); i++)
  54         if (Side_position_interface::get_axis (scripts_[i]) == Y_AXIS)
  55           Script_column::add_side_positioned (script_column_, scripts_[i]);
  56     }
  57
  58   script_column_ = 0;
  59   scripts_.clear ();
  60 }
  61
  62 void
  63 Script_column_engraver::acknowledge_side_position (Grob_info inf)
  64 {
  65   Item *thing = dynamic_cast<Item *> (inf.grob ());
  66   if (thing)
  67     {
  68       if (!Item::is_non_musical (thing))
  69         scripts_.push_back (thing);
  70     }
  71 }
  72
  73 void
  74 Script_column_engraver::process_acknowledged ()
  75 {
  76   if (!script_column_ && scripts_.size () > 1)
  77     script_column_ = make_item ("ScriptColumn", SCM_EOL);
  78 }
  79
  80 ADD_ACKNOWLEDGER (Script_column_engraver, side_position);
  81 ADD_TRANSLATOR (Script_column_engraver,
  82                 /* doc */
  83                 "Find potentially colliding scripts and put them into a"
  84                 " @code{ScriptColumn} object; that will fix the collisions.",
  85
  86                 /* create */
  87                 "ScriptColumn ",
  88
  89                 /* read */
  90                 "",
  91
  92                 /* write */
  93                 ""
  94                 );