2 span-bar-grav.cc -- implement Span_bar_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
11 #include "span-bar.hh"
12 #include "engraver.hh"
16 Make bars that span multiple "staves". Catch bars, and span a
17 Span_bar over them if we find more than 2 bars. Vertical alignment
18 of staves changes the appearance of spanbars. It is up to the
19 aligner (Vertical_align_engraver, in this case, to add extra
20 dependencies to the spanbars.
23 class Span_bar_engraver : public Engraver
26 Link_array<Item> bars_;
29 TRANSLATOR_DECLARATIONS (Span_bar_engraver);
31 virtual void acknowledge_grob (Grob_info);
32 virtual void stop_translation_timestep ();
35 Span_bar_engraver::Span_bar_engraver ()
41 Span_bar_engraver::acknowledge_grob (Grob_info i)
43 int depth = i.origin_contexts (this).size ();
44 if (depth && Bar_line::has_interface (i.grob_))
46 Item * it = dynamic_cast<Item*> (i.grob_);
49 if (bars_.size () >= 2 && !spanbar_)
51 spanbar_ = make_item ("SpanBar", SCM_EOL);
53 spanbar_->set_parent (bars_[0], X_AXIS);
60 Span_bar_engraver::stop_translation_timestep ()
64 for (int i = 0; i < bars_.size () ; i++)
65 Span_bar::add_bar (spanbar_,bars_[i]);
67 SCM vissym = ly_symbol2scm ("break-visibility");
68 SCM vis = bars_[0]->internal_get_property (vissym);
69 if (ly_c_equal_p (spanbar_->internal_get_property (vissym), vis))
70 spanbar_->internal_set_property (vissym, vis);
79 ADD_TRANSLATOR (Span_bar_engraver,
80 /* descr */ "This engraver makes cross-staff barlines: It catches all normal "
81 "bar lines, and draws a single span-bar across them.",
82 /* creats*/ "SpanBar",
84 /* acks */ "bar-line-interface",