CalculatorButton constructor Null safety

CalculatorButton(
  1. ButtonFactory bFactory,
  2. String uText,
  3. String fText,
  4. String gText,
  5. Operation uKey,
  6. Operation fKey,
  7. Operation gKey,
  8. String acceleratorKey,
  9. {String? acceleratorLabel}
)

Implementation

CalculatorButton(this.bFactory, this.uText, this.fText, this.gText, this.uKey,
    this.fKey, this.gKey, this.acceleratorKey,
    {String? acceleratorLabel})
    : _acceleratorLabel = acceleratorLabel;