setOrNull method

  1. @override
T? setOrNull(
  1. T value
)
override

Sets the contents of the cell to value. Returns null if the value is already set. Otherwise returns the input value.

Implementation

@override
T? setOrNull(T value) {
  if (_val != null) {
    return null;
  }
  _val = value;
  return value;
}