LilyPond Internals Reference: 3.1.54 KeySignature

### 3.1.54 KeySignature

KeySignature objects are created by: Key_engraver.

Standard settings:

> `avoid-slur` (symbol):

>   `'inside`

>   Method of handling slur collisions. Choices are `inside`, `outside`, `around`, and `ignore`. `inside` adjusts the slur if needed to keep the grob inside the slur. `outside` moves the grob vertically to the outside of the slur. `around` moves the grob vertically to the outside of the slur only if there is a collision. `ignore` does not move either. In grobs whose notational significance depends on vertical position (such as accidentals, clefs, etc.), `outside` and `around` behave like `ignore`.

> `break-align-anchor` (number):

>   `ly:break-aligned-interface::calc-extent-aligned-anchor`

>   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-symbol` (symbol):

>   `'key-signature`

>   This key is used for aligning and spacing breakable items.

> `break-visibility` (vector):

>   `#(#f #f #t)`

>   A vector of 3 booleans, `#(end-of-line unbroken begin-of-line)`. `#t` means visible, `#f` means killed.

> `extra-spacing-width` (pair of numbers):

>   `'(0.0 . 0.5)`

>   In the horizontal spacing problem, we pad each item by this amount (by adding the ‘car’ on the left side of the item and adding the ‘cdr’ on the right side of the item). In order to make a grob take up no horizontal space at all, set this to `(+inf.0 . -inf.0)`.

> `glyph-name-alist` (list):

>   `'((0 . accidentals.natural) (-1/2 . accidentals.flat) (1/2 . accidentals.sharp) (1 . accidentals.doublesharp) (-1 . accidentals.flatflat) (3/4 . accidentals.sharp.slashslash.stemstemstem) (1/4 . accidentals.sharp.slashslash.stem) (-1/4 . accidentals.mirroredflat) (-3/4 . accidentals.mirroredflat.flat))`

>   An alist of key-string pairs.

> `non-musical` (boolean):

>   `#t`

>   True if the grob belongs to a `NonMusicalPaperColumn`.

> `space-alist` (list):

>   `'((time-signature extra-space . 1.15) (staff-bar extra-space . 1.1) (cue-clef extra-space . 0.5) (right-edge extra-space . 0.5) (first-note fixed-space . 2.5))`

>   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 symbols `minimum-space` or `extra-space`.

> `stencil` (stencil):

>   `ly:key-signature-interface::print`

>   The symbol to print.

> `Y-offset` (number):

>   `ly:staff-symbol-referencer::callback`

>   The vertical amount that this object is moved relative to its Y-parent.

This object supports the following interface(s): break-aligned-interface, font-interface, grob-interface, item-interface, key-signature-interface and staff-symbol-referencer-interface.

#### Internals Reference