Stepper constructor

Stepper({Key key, @required List<Step> steps, StepperType type: StepperType.vertical, int currentStep: 0, ValueChanged<int> onStepTapped, VoidCallback onStepContinue, VoidCallback onStepCancel, ControlsWidgetBuilder controlsBuilder })

Creates a stepper from a list of steps.

This widget is not meant to be rebuilt with a different list of steps unless a key is provided in order to distinguish the old stepper from the new one.

The steps, type, and currentStep arguments must not be null.

Implementation 

Stepper({
  Key key,
  @required this.steps,
  this.type = StepperType.vertical,
  this.currentStep = 0,
  this.onStepTapped,
  this.onStepContinue,
  this.onStepCancel,
  this.controlsBuilder,
}) : assert(steps != null),
     assert(type != null),
     assert(currentStep != null),
     assert(0 <= currentStep && currentStep < steps.length),
     super(key: key);