StepperWidget.dart

Widget _typeStep() => Container(
    child: Stepper(
      
      controlsBuilder: (BuildContext context, {VoidCallback onStepContinue, VoidCallback onStepCancel}) {
        return Padding(
          padding: EdgeInsets.all(8.0),
          child: RaisedButton(
            onPressed: () {
              setState(() {
                currentStep < spr.length - 1 ? currentStep += 1 : currentStep = 0;
              });
            },
            color: Colors.blue,
            textColor: Colors.white,
            child: Text('Next'),
          ),
        );
      },
      
      steps: _getSteps(),
      currentStep: currentStep,
      type: StepperType.horizontal,
      onStepTapped: (step) {
        setState(() {
          currentStep = step;
          print(step);
        });
      },
      onStepCancel: () {
        setState(() {
          currentStep > 0 ? currentStep -= 1 : currentStep = 0;
        });
      },
      onStepContinue: () {
        setState(() {
          currentStep < spr.length - 1 ? currentStep += 1 : currentStep = 0;
        });
      },
    ),
  );