Bases: abjad.core.interface._Interface, abjad.core.grobhandler._GrobHandler
New in version 1.1.1.
Manage barlines that span the space between staves in a single system.
abjad> t = Note(0, (1, 4))
abjad> t.barline
<SpanBarInterface>
Override LilyPond SpanBar grob.
abjad> t.spanbar.color = 'red'
abjad> overridetools.promote(t.spanbar, 'color', 'Score')
abjad> print t.format
\once \override Score.SpanBar #'color = #red
c'4