LilyPond Internals Reference: 3.2.25 centered-spanner-interface

### 3.2.25 `centered-spanner-interface`

A spanner that prints a symbol centered between two columns.

#### User settable properties:

`self-alignment-X` (number)

  Specify alignment of an object. The value `-1` means left aligned, `0` centered, and `1` right-aligned in X direction. Other numerical values may also be specified - the unit is half the object width.

`spacing-pair` (pair)

  A pair of alignment symbols which set an object’s spacing relative to its left and right `BreakAlignment`s.

  For example, a `MultiMeasureRest` will ignore prefatory items at its bounds (i.e., clefs, key signatures and time signatures) using the following override:

  >     \override MultiMeasureRest.spacing-pair =
  >                  #'(staff-bar . staff-bar)

This grob interface is used in the following graphical object(s): `CenteredBarNumber`, `MeasureCounter` and `PercentRepeat`.

#### LilyPond – Internals Reference v2.24.4 (stable-branch).