### 2.2.26 Default_bar_line_engraver

This engraver determines what kind of automatic bar lines should be produced, and sets `whichBar` accordingly. It should be at the same level as Timing_translator.

Properties (read)

> `automaticBars` (boolean)

>   If set to false then bar lines will not be printed automatically; they must be explicitly created with a `\bar` command. Unlike the `\cadenzaOn` keyword, measures are still counted. Bar line generation will resume according to that count if this property is unset.

> `barAlways` (boolean)

>   If set to true a bar line is drawn after each note.

> `defaultBarType` (string)

>   Set the default type of bar line. See `whichBar` for information on available bar types.

>   This variable is read by Timing_translator at Score level.

> `measureLength` (moment)

>   Length of one measure in the current time signature.

> `measurePosition` (moment)

>   How much of the current measure have we had. This can be set manually to create incomplete measures.

> `timing` (boolean)

>   Keep administration of measure length, position, bar number, etc.? Switch off for cadenzas.

> `whichBar` (string)

>   This property is read to determine what type of bar line to create.

>   Example:

>   >     \set Staff.whichBar = ".|:"

>   This will create a start-repeat bar in this staff only. Valid values are described in ‘`scm/bar-line.scm`’.

`Default_bar_line_engraver` is part of the following context(s): Score.

#### Internals Reference v2.18.2 (稳定分支).