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3.2.15 break-aligned-interface
Items that are aligned in prefatory matter.
The spacing of these items is controlled by the space-alist property. It contains a list break-align-symbols with a specification of the associated space. The space specification can be
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(minimum-space . spc)) Pad space until the distance is spc.
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(fixed-space . spc) Set a fixed space.
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(semi-fixed-space . spc) Set a space. Half of it is fixed and half is stretchable. (does not work at start of line. fixme)
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(extra-space . spc) Add spc amount of space.
Special keys for the alist are first-note and next-note, signifying the first note on a line, and the next note halfway a line.
Rules for this spacing are much more complicated than this. See [Wanske] page 126–134, [Ross] page 143–147.
User settable properties:
break-align-anchor(number)Grobs aligned to this break-align grob will have their X-offsets shifted by this number. In bar lines, for example, this is used to position grobs relative to the (visual) center of the bar line.
break-align-anchor-alignment(number)Read by
ly:break-aligned-interface::calc-extent-aligned-anchorfor aligning an anchor to a grob’s extent.break-align-symbol(symbol)This key is used for aligning and spacing breakable items.
space-alist(list)A table that specifies distances between prefatory items, like clef and time-signature. The format is an alist of spacing tuples:
(break-align-symbol type . distance), where type can be the symbolsminimum-spaceorextra-space.
This grob interface is used in the following graphical object(s): Ambitus, AmbitusAccidental, BarLine, BreakAlignGroup, BreathingSign, Clef, CueClef, CueEndClef, Custos, DoublePercentRepeat, KeyCancellation, KeySignature, LeftEdge and TimeSignature.
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