lily/span-bar-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--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 "bar-line.hh"
  21 #include "item.hh"
  22 #include "span-bar.hh"
  23 #include "engraver.hh"
  24
  25 /**
  26
  27 Make bars that span multiple "staves". Catch bars, and span a
  28 Span_bar over them if we find more than 2 bars.  Vertical alignment
  29 of staves changes the appearance of spanbars.  It is up to the
  30 aligner (Vertical_align_engraver, in this case, to add extra
  31 dependencies to the spanbars.
  32 */
  33 class Span_bar_engraver : public Engraver
  34 {
  35   Item *spanbar_;
  36   vector<Item*> bars_;
  37
  38 public:
  39   TRANSLATOR_DECLARATIONS (Span_bar_engraver);
  40 protected:
  41   DECLARE_ACKNOWLEDGER (bar_line);
  42   void stop_translation_timestep ();
  43 };
  44
  45 Span_bar_engraver::Span_bar_engraver ()
  46 {
  47   spanbar_ = 0;
  48 }
  49
  50 void
  51 Span_bar_engraver::acknowledge_bar_line (Grob_info i)
  52 {
  53   int depth = i.origin_contexts (this).size ();
  54   if (depth && !Span_bar::has_interface (i.grob ()))
  55     {
  56       Item *it = dynamic_cast<Item *> (i.grob ());
  57       bars_.push_back (it);
  58
  59       if (bars_.size () >= 2 && !spanbar_)
  60         {
  61           spanbar_ = make_item ("SpanBar", SCM_EOL);
  62
  63           spanbar_->set_parent (bars_[0], X_AXIS);
  64         }
  65     }
  66 }
  67
  68 void
  69 Span_bar_engraver::stop_translation_timestep ()
  70 {
  71   if (spanbar_)
  72     {
  73       for (vsize i = 0; i < bars_.size (); i++)
  74         Span_bar::add_bar (spanbar_, bars_[i]);
  75
  76       SCM vissym = ly_symbol2scm ("break-visibility");
  77       SCM vis = bars_[0]->internal_get_property (vissym);
  78       if (ly_is_equal (spanbar_->internal_get_property (vissym), vis))
  79         spanbar_->set_property (vissym, vis);
  80
  81       spanbar_ = 0;
  82     }
  83   bars_.resize (0);
  84 }
  85
  86 #include "translator.icc"
  87
  88 ADD_ACKNOWLEDGER (Span_bar_engraver, bar_line);
  89 ADD_TRANSLATOR (Span_bar_engraver,
  90                 /* doc */
  91                 "Make cross-staff bar lines: It catches all normal bar lines"
  92                 " and draws a single span bar across them.",
  93
  94                 /* create */
  95                 "SpanBar ",
  96
  97                 /* read */
  98                 "",
  99
 100                 /* write */
 101                 ""
 102                 );