무한 스크롤되는 캐러셀 예제 https://dartpad.dev/?id=637b216c30d3f8eb7e65bdc37fbd7eba

infinite_carousel_example.dart

import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: CarouselScreen(),
    );
  }
}

class CarouselScreen extends StatefulWidget {
  const CarouselScreen({super.key});

  @override
  // ignore: library_private_types_in_public_api
  _CarouselScreenState createState() => _CarouselScreenState();
}

class _CarouselScreenState extends State<CarouselScreen> {
  final List<String> carouselItems = [
    'Item 1',
    'Item 2',
    'Item 3',
    'Item 4',
    'Item 5',
  ];

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('무한스크롤'),
      ),
      body: Center(
        child: SizedBox(
          height: 200,
          child: InfiniteCarousel(
            itemBuilder: (context, index) {
              return Container(
                margin: const EdgeInsets.symmetric(horizontal: 8),
                color: Colors.blue,
                child: const Center(
                  child: Text(
                    "Hello World",
                    style: TextStyle(fontSize: 24, color: Colors.white),
                  ),
                ),
              );
            },
            itemCount: carouselItems.length,
            onPageChanged: (int page) {},
          ),
        ),
      ),
    );
  }
}

class InfiniteCarousel extends StatefulWidget {
  const InfiniteCarousel({
    super.key,
    required this.itemBuilder,
    required this.itemCount,
    this.onPageChanged,
  });

  final Widget Function(BuildContext context, int index) itemBuilder;
  final int itemCount;
  final void Function(int page)? onPageChanged;

  @override
  State<InfiniteCarousel> createState() => _InfiniteCarouselState();
}

class _InfiniteCarouselState extends State<InfiniteCarousel> {
  late PageController _pageController;
  int _currentPage = 0;

  @override
  void initState() {
    super.initState();
    _pageController = PageController(
      initialPage: _currentPage + widget.itemCount * 1000,
      viewportFraction: 1,
    );

    _pageController.addListener(() {
      setState(() {
        _currentPage = (_pageController.page?.round() ?? 1) % widget.itemCount;
      });
      widget.onPageChanged?.call(_currentPage);
    });
  }

  @override
  Widget build(BuildContext context) {
    return PageView.builder(
      controller: _pageController,
      itemBuilder: widget.itemBuilder,
    );
  }
}