updaters property Null safety

Map<String, Map<bool, SelectionUpdater<AV>>>? updaters
read / write

Attribute updaters when a selection occurs.

The keys of outer map are names of selections defined, and Corresponding definitions will only react to their on selections.

The keys of inner map are selection states. True means selected and false means unselected. The corresponding updates will react when the tuple is in That state.

Not that this definition is only meaningfull when a selection orrurs. If there is no current selection, tuples are neither selected or unselected.


Map<String, Map<bool, SelectionUpdater<AV>>>? updaters;