2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
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.
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.
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/>.
21 #include "engraver.hh"
22 #include "pointer-group-interface.hh"
23 #include "lily-imports.hh"
25 #include "translator.icc"
29 Make bars that span multiple "staves". Catch bars, and span a
30 Span_bar over them if we find more than 2 bars. Vertical alignment
31 of staves changes the appearance of spanbars. It is up to the
32 aligner (Vertical_align_engraver, in this case, to add extra
33 dependencies to the spanbars.
35 class Span_bar_engraver : public Engraver
42 TRANSLATOR_DECLARATIONS (Span_bar_engraver);
44 void acknowledge_bar_line (Grob_info);
45 void stop_translation_timestep ();
46 void process_acknowledged ();
49 Span_bar_engraver::Span_bar_engraver (Context *c)
53 make_spanbar_ = false;
57 Span_bar_engraver::acknowledge_bar_line (Grob_info i)
59 int depth = i.origin_contexts (this).size ();
60 if (depth && !i.grob ()->internal_has_interface (ly_symbol2scm ("span-bar-interface")))
62 Item *it = dynamic_cast<Item *> (i.grob ());
65 if (bars_.size () >= 2 && !spanbar_)
71 Span_bar_engraver::process_acknowledged ()
75 spanbar_ = make_item ("SpanBar", SCM_EOL);
77 spanbar_->set_parent (bars_[0], X_AXIS);
78 for (vsize i = 0; i < bars_.size (); i++)
79 Pointer_group_interface::add_grob (spanbar_, ly_symbol2scm ("elements"), bars_[i]);
80 make_spanbar_ = false;
85 Span_bar_engraver::stop_translation_timestep ()
89 SCM vis = bars_[0]->get_property ("break-visibility");
90 if (ly_is_equal (spanbar_->get_property ("break-visibility"), vis))
91 spanbar_->set_property ("break-visibility", vis);
92 Lily::span_bar_notify_grobs_of_my_existence (spanbar_->self_scm ());
99 Span_bar_engraver::boot ()
101 ADD_ACKNOWLEDGER (Span_bar_engraver, bar_line);
104 ADD_TRANSLATOR (Span_bar_engraver,
106 "Make cross-staff bar lines: It catches all normal bar lines"
107 " and draws a single span bar across them.",