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/*
This file is part of LilyPond, the GNU music typesetter.
Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
LilyPond is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
LilyPond is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
#include "item.hh"
#include "engraver.hh"
#include "pointer-group-interface.hh"
#include "lily-imports.hh"
#include "translator.icc"
/**
Make bars that span multiple "staves". Catch bars, and span a
Span_bar over them if we find more than 2 bars. Vertical alignment
of staves changes the appearance of spanbars. It is up to the
aligner (Vertical_align_engraver, in this case, to add extra
dependencies to the spanbars.
*/
class Span_bar_engraver : public Engraver
{
Item *spanbar_;
bool make_spanbar_;
vector<Item *> bars_;
public:
TRANSLATOR_DECLARATIONS (Span_bar_engraver);
protected:
void acknowledge_bar_line (Grob_info);
void stop_translation_timestep ();
void process_acknowledged ();
};
Span_bar_engraver::Span_bar_engraver ()
{
spanbar_ = 0;
make_spanbar_ = false;
}
void
Span_bar_engraver::acknowledge_bar_line (Grob_info i)
{
int depth = i.origin_contexts (this).size ();
if (depth && !i.grob ()->internal_has_interface (ly_symbol2scm ("span-bar-interface")))
{
Item *it = dynamic_cast<Item *> (i.grob ());
bars_.push_back (it);
if (bars_.size () >= 2 && !spanbar_)
make_spanbar_ = true;
}
}
void
Span_bar_engraver::process_acknowledged ()
{
if (make_spanbar_)
{
spanbar_ = make_item ("SpanBar", SCM_EOL);
spanbar_->set_parent (bars_[0], X_AXIS);
for (vsize i = 0; i < bars_.size (); i++)
Pointer_group_interface::add_grob (spanbar_, ly_symbol2scm ("elements"), bars_[i]);
make_spanbar_ = false;
}
}
void
Span_bar_engraver::stop_translation_timestep ()
{
if (spanbar_)
{
SCM vis = bars_[0]->get_property ("break-visibility");
if (ly_is_equal (spanbar_->get_property ("break-visibility"), vis))
spanbar_->set_property ("break-visibility", vis);
Lily::span_bar_notify_grobs_of_my_existence (spanbar_->self_scm ());
spanbar_ = 0;
}
bars_.resize (0);
}
void
Span_bar_engraver::boot ()
{
ADD_ACKNOWLEDGER (Span_bar_engraver, bar_line);
}
ADD_TRANSLATOR (Span_bar_engraver,
/* doc */
"Make cross-staff bar lines: It catches all normal bar lines"
" and draws a single span bar across them.",
/* create */
"SpanBar ",
/* read */
"",
/* write */
""
);
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