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3.2.62 hara-kiri-group-spanner-interface

A group spanner that keeps track of interesting items. If it doesn’t contain any after line breaking, it removes itself and all its children. Greater control can be exercised via remove-layer which can prioritize layers so only the lowest-numbered non-empty layer is retained; make the layer independent of the group; or make it dependent on any other member of the group

User-settable properties:

remove-empty (boolean)

If set, remove group if it contains no interesting items.

remove-first (boolean)

Remove the first staff of an orchestral score?

remove-layer (index or symbol)

When set as a positive integer, the Keep_alive_together_engraver removes all VerticalAxisGroup grobs with a remove-layer larger than the smallest retained remove-layer. Set to #f to make a layer independent of the Keep_alive_together_engraver. Set to '(), the layer does not participate in the layering decisions. The property can also be set as a symbol for common behaviors: #'any to keep the layer alive with any other layer in the group; #'above or #'below to keep the layer alive with the context immediately before or after it, respectively.

Internal properties:

important-column-ranks (vector)

A cache of columns that contain items-worth-living data.

items-worth-living (array of grobs)

An array of interesting items. If empty in a particular staff, then that staff is erased.

keep-alive-with (array of grobs)

An array of other VerticalAxisGroups. If any of them are alive, then we will stay alive.

make-dead-when (array of grobs)

An array of other VerticalAxisGroups. If any of them are alive, then we will turn dead.

This grob interface is used in the following graphical object(s): VerticalAxisGroup.