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"
26 Make bars that span multiple "staves". Catch bars, and span a
27 Span_bar over them if we find more than 2 bars. Vertical alignment
28 of staves changes the appearance of spanbars. It is up to the
29 aligner (Vertical_align_engraver, in this case, to add extra
30 dependencies to the spanbars.
32 class Span_bar_engraver : public Engraver
39 TRANSLATOR_DECLARATIONS (Span_bar_engraver);
41 DECLARE_ACKNOWLEDGER (bar_line);
42 void stop_translation_timestep ();
43 void process_acknowledged ();
46 Span_bar_engraver::Span_bar_engraver ()
49 make_spanbar_ = false;
53 Span_bar_engraver::acknowledge_bar_line (Grob_info i)
55 int depth = i.origin_contexts (this).size ();
56 if (depth && !i.grob ()->internal_has_interface (ly_symbol2scm ("span-bar-interface")))
58 Item *it = dynamic_cast<Item *> (i.grob ());
61 if (bars_.size () >= 2 && !spanbar_)
67 Span_bar_engraver::process_acknowledged ()
71 spanbar_ = make_item ("SpanBar", SCM_EOL);
73 spanbar_->set_parent (bars_[0], X_AXIS);
74 for (vsize i = 0; i < bars_.size (); i++)
75 Pointer_group_interface::add_grob (spanbar_, ly_symbol2scm ("elements"), bars_[i]);
76 make_spanbar_ = false;
81 Span_bar_engraver::stop_translation_timestep ()
85 SCM vis = bars_[0]->get_property ("break-visibility");
86 if (ly_is_equal (spanbar_->get_property ("break-visibility"), vis))
87 spanbar_->set_property ("break-visibility", vis);
88 scm_call_1 (ly_lily_module_constant ("span-bar::notify-grobs-of-my-existence"), spanbar_->self_scm ());
94 #include "translator.icc"
96 ADD_ACKNOWLEDGER (Span_bar_engraver, bar_line);
97 ADD_TRANSLATOR (Span_bar_engraver,
99 "Make cross-staff bar lines: It catches all normal bar lines"
100 " and draws a single span bar across them.",