CarouselSliderState - isn't a type so it can't be used as a type argument

[sambaPython24]

With flutter 3.3. I get the following error in Visual Studio Code when trying to run the example:

The name 'CarouselSliderState' isn't a type so it can't be used as a type argument.
Try correcting the name to an existing type, or defining a type named 'CarouselSliderState'.

for the line

GlobalKey<CarouselSliderState> _sliderKey = GlobalKey();

and when trying to execute the code with flutter run -d chrome

lib/.../cube_slider.dart:319:13: Error: Type 'CarouselSliderState' not found.
  GlobalKey<CarouselSliderState> _sliderKey = GlobalKey();

---

I imported the modules like

import 'package:flutter/material.dart';
import 'package:flutter_carousel_slider/carousel_slider.dart';
import 'package:flutter_carousel_slider/carousel_slider_indicators.dart';
import 'package:flutter_carousel_slider/carousel_slider_transforms.dart';

[UdaraWanasinghe]

I couldn't reproduce this issue. Can you attach some stack traces?

[UdaraWanasinghe]

Just uploaded v1.1.0. Please let me know if the issue is still there in version 1.1.0

[sambaPython24]

Hey, there were some errors in the example code that have not been errors in previous version of flutter but are related to the nullable framework of the new flutter version.

If you change the minimal example to

import 'package:flutter/material.dart';

import 'package:flutter_carousel_slider/carousel_slider.dart';
import 'package:flutter_carousel_slider/carousel_slider_indicators.dart';
import 'package:flutter_carousel_slider/carousel_slider_transforms.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Cube Slider Try Out App',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final List<Color> colors = [
    Colors.red,
    Colors.orange,
    Colors.yellow,
    Colors.green,
    Colors.blue,
    Colors.indigo,
    Colors.purple,
  ];
  final List<String> letters = [
    "A",
    "B",
    "C",
    "D",
    "E",
    "F",
    "G",
  ];

  bool _isPlaying = true;

  late CarouselSliderController _sliderController;

  @override
  void initState() {
    super.initState();
    _sliderController = CarouselSliderController();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: ListView(
        children: <Widget>[
          Container(
            height: 500,
            child: CarouselSlider.builder(
              unlimitedMode: true,
              controller: _sliderController,
              slideBuilder: (index) {
                return Container(
                  alignment: Alignment.center,
                  color: colors[index],
                  child: Text(
                    letters[index],
                    style: TextStyle(fontSize: 200, color: Colors.white),
                  ),
                );
              },
              slideTransform: CubeTransform(),
              slideIndicator: CircularSlideIndicator(
                padding: EdgeInsets.only(bottom: 32),
                indicatorBorderColor: Colors.black,
              ),
              itemCount: colors.length,
              initialPage: 0,
              enableAutoSlider: true,
            ),
          ),
          Padding(
            padding: const EdgeInsets.symmetric(vertical: 32),
            child: Align(
              child: ConstrainedBox(
                constraints: BoxConstraints(minWidth: 240, maxWidth: 600),
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                  children: [
                    IconButton(
                      iconSize: 48,
                      icon: Icon(Icons.skip_previous),
                      onPressed: () {
                        _sliderController.previousPage();
                      },
                    ),
                    IconButton(
                      iconSize: 64,
                      icon: Icon(
                        _isPlaying ? Icons.pause_circle_outline : Icons.play_circle_outline,
                      ),
                      onPressed: () {
                        setState(
                              () {
                            _isPlaying = !_isPlaying;
                            _sliderController.setAutoSliderEnabled(_isPlaying);
                          },
                        );
                      },
                    ),
                    IconButton(
                      iconSize: 48,
                      icon: Icon(Icons.skip_next),
                      onPressed: () {
                        _sliderController.nextPage();
                      },
                    ),
                  ],
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}

it is working fine for me.

PS: Is it possible to also have the cube effect vertically and horizontally at the same time?

Sources:

• 1
• 2