cupertino_stepper 0.2.0-nullsafety.0

Stepper is a widget that displays progress through a sequence of steps. This is a Cupertino version of the stock Material Stepper in Flutter.

example/lib/example.dart

// Copyright 2020 J-P Nurmi <[e-mail]>
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/cupertino.dart';
import 'package:cupertino_stepper/cupertino_stepper.dart';

void main() => runApp(StepperApp());

class StepperApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return CupertinoApp(
      title: 'CupertinoStepper for Flutter',
      debugShowCheckedModeBanner: false,
      home: StepperPage(),
    );
  }
}

class StepperPage extends StatefulWidget {
  @override
  _StepperPageState createState() => _StepperPageState();
}

class _StepperPageState extends State<StepperPage> {
  int currentStep = 0;

  @override
  Widget build(BuildContext context) {
    return CupertinoPageScaffold(
      navigationBar: CupertinoNavigationBar(
        middle: Text('CupertinoStepper for Flutter'),
      ),
      child: SafeArea(
        child: OrientationBuilder(
          builder: (BuildContext context, Orientation orientation) {
            switch (orientation) {
              case Orientation.portrait:
                return _buildStepper(StepperType.vertical);
              case Orientation.landscape:
                return _buildStepper(StepperType.horizontal);
              default:
                throw UnimplementedError(orientation.toString());
            }
          },
        ),
      ),
    );
  }

  CupertinoStepper _buildStepper(StepperType type) {
    final canCancel = currentStep > 0;
    final canContinue = currentStep < 3;
    return CupertinoStepper(
      type: type,
      currentStep: currentStep,
      onStepTapped: (step) => setState(() => currentStep = step),
      onStepCancel: canCancel ? () => setState(() => --currentStep) : null,
      onStepContinue: canContinue ? () => setState(() => ++currentStep) : null,
      steps: [
        for (var i = 0; i < 3; ++i)
          _buildStep(
            title: Text('Step ${i + 1}'),
            isActive: i == currentStep,
            state: i == currentStep
                ? StepState.editing
                : i < currentStep ? StepState.complete : StepState.indexed,
          ),
        _buildStep(
          title: Text('Error'),
          state: StepState.error,
        ),
        _buildStep(
          title: Text('Disabled'),
          state: StepState.disabled,
        )
      ],
    );
  }

  Step _buildStep({
    required Widget title,
    StepState state = StepState.indexed,
    bool isActive = false,
  }) {
    return Step(
      title: title,
      subtitle: Text('Subtitle'),
      state: state,
      isActive: isActive,
      content: LimitedBox(
        maxWidth: 300,
        maxHeight: 300,
        child: Container(color: CupertinoColors.systemGrey),
      ),
    );
  }
}