onRemoveListener method

RemoveListener onRemoveListener(void cb())

A life-cycle for whenever a listener is removed from the provider.

Returns a function which can be called to remove the listener.

See also:

• onAddListener, for when a listener is added

Implementation

RemoveListener onRemoveListener(void Function() cb) {
  _throwIfInvalidUsage();

  final list = _onRemoveListeners ??= [];
  list.add(cb);

  return () => list.remove(cb);
}