addOnCorrectStrokeCallback method Null safety

void addOnCorrectStrokeCallback(
  1. Function? onCorrectStrokeCallback
)

Implementation

void addOnCorrectStrokeCallback(Function? onCorrectStrokeCallback) {
  if (onCorrectStrokeCallback != null) {
    _onCorrectStrokeCallbacks.add(onCorrectStrokeCallback);
  }
}