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"
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.
33 class Span_bar_engraver : public Engraver
40 TRANSLATOR_DECLARATIONS (Span_bar_engraver);
42 DECLARE_ACKNOWLEDGER (bar_line);
43 void stop_translation_timestep ();
44 void process_acknowledged ();
47 Span_bar_engraver::Span_bar_engraver ()
50 make_spanbar_ = false;
54 Span_bar_engraver::acknowledge_bar_line (Grob_info i)
56 int depth = i.origin_contexts (this).size ();
57 if (depth && !i.grob ()->internal_has_interface (ly_symbol2scm ("span-bar-interface")))
59 Item *it = dynamic_cast<Item *> (i.grob ());
62 if (bars_.size () >= 2 && !spanbar_)
68 Span_bar_engraver::process_acknowledged ()
72 spanbar_ = make_item ("SpanBar", SCM_EOL);
74 spanbar_->set_parent (bars_[0], X_AXIS);
75 for (vsize i = 0; i < bars_.size (); i++)
76 Pointer_group_interface::add_grob (spanbar_, ly_symbol2scm ("elements"), bars_[i]);
77 make_spanbar_ = false;
82 Span_bar_engraver::stop_translation_timestep ()
86 SCM vis = bars_[0]->get_property ("break-visibility");
87 if (ly_is_equal (spanbar_->get_property ("break-visibility"), vis))
88 spanbar_->set_property ("break-visibility", vis);
89 Lily::span_bar_notify_grobs_of_my_existence (spanbar_->self_scm ());
95 #include "translator.icc"
97 ADD_ACKNOWLEDGER (Span_bar_engraver, bar_line);
98 ADD_TRANSLATOR (Span_bar_engraver,
100 "Make cross-staff bar lines: It catches all normal bar lines"
101 " and draws a single span bar across them.",