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B.19 Grobs and their break-align symbols

The ordering and spacing of notational elements like clefs, time signatures, bar lines, etc., is determined using certain Scheme symbols, the so-called break-align symbols. More precisely, their ordering is determined by lists of break-align symbols in the BreakAlignment.break-align-orders vector (see break-alignment-interface); their spacing is controlled by the space-alist properties of the respective grobs, whose elements are in turn indexed by break-align symbols: For instance, the spacing of a Clef grob to a bar line following it is determined by the value of Clef.space-alist.staff-bar.

This table lists the default correspondence between break-align symbols and grobs:

break-align symbol	used by grob(s)
ambitus	Ambitus
breathing-sign	BreathingSign
clef	Clef
cue-clef	CueClef
cue-end-clef	CueEndClef
custos	Custos
key-cancellation	KeyCancellation
key-signature	KeySignature
left-edge	LeftEdge
optional-material-end-bracket	OptionalMaterialBracket
optional-material-start-bracket	OptionalMaterialBracket
signum-repetitionis	SignumRepetitionis
staff-bar	SpanBar, DoublePercentRepeat, Divisio and BarLine
staff-ellipsis	StaffEllipsis
time-signature	TimeSignature

Furthermore, there are three abstract break-align symbols that may be used in space-alist definitions, namely first-note, next-note and right-edge. For details, see the documentation of the space-alist grob property in break-aligned-interface.

The next table lists the break-align symbol used by each grob:

Grob	break-align symbol(s)
Ambitus	ambitus
BarLine	staff-bar
BreathingSign	breathing-sign
Clef	clef
CueClef	cue-clef
CueEndClef	cue-end-clef
Custos	custos
Divisio	staff-bar
DoublePercentRepeat	staff-bar
KeyCancellation	key-cancellation
KeySignature	key-signature
LeftEdge	left-edge
OptionalMaterialBracket	optional-material-start-bracket and optional-material-end-bracket
SignumRepetitionis	signum-repetitionis
SpanBar	staff-bar
StaffEllipsis	staff-ellipsis
TimeSignature	time-signature