how to get unlimited scroll?

[suryakka]

No description provided.

[definev]

You can implement CircleListWheelChildLoopingListDelegate and you get infinity scroll:
class CircleListWheelChildLoopingListDelegate extends CircleListChildDelegate {
/// Constructs the delegate from a concrete list of children.
CircleListWheelChildLoopingListDelegate({@required this.children})
: assert(children != null);

/// The list containing all children that can be supplied.
final List children;

@OverRide
int get estimatedChildCount => null;

@OverRide
int trueIndexOf(int index) => index % children.length;

@OverRide
Widget build(BuildContext context, int index) {
if (children.isEmpty) return null;
return IndexedSemantics(
child: children[index % children.length], index: index);
}

@OverRide
bool shouldRebuild(
covariant CircleListWheelChildLoopingListDelegate oldDelegate) {
return children != oldDelegate.children;
}
}

[jtkeyva]

@definev i cannot get this to work. how do you implement this? thank you

[jtkeyva]

ah i got it now:

import 'package:flutter/material.dart';
import 'package:circle_wheel_scroll/circle_wheel_scroll_view.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: Scaffold(
        body: Center(
          child: WheelExample(),
        ),
      ),
    );
  }
}

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

  Widget _buildItem(int i) {
    return Center(
      child: ClipRRect(
        borderRadius: BorderRadius.circular(40),
        child: Container(
          width: 80,
          padding: const EdgeInsets.all(20),
          color: Colors.blue[100 * ((i % 8) + 1)],
          child: Center(
            child: Text(
              '${i.toString()}',
            ),
          ),
        ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    // Create the list of children
    final children = List.generate(20, _buildItem);

    // Create the custom delegate with the children
    final delegate =
        CircleListWheelChildLoopingListDelegate(children: children);

    return Scaffold(
      appBar: AppBar(
        title: const Text('Wheel example'),
      ),
      body: SafeArea(
        child: Center(
          child: Container(
            child: CircleListScrollView.useDelegate(
              physics: const CircleFixedExtentScrollPhysics(),
              axis: Axis.horizontal,
              itemExtent: 80,
              radius: MediaQuery.of(context).size.width * 0.6,
              onSelectedItemChanged: (int index) =>
                  print('Current index: $index'),
              childDelegate: delegate,
            ),
          ),
        ),
      ),
    );
  }
}

class CircleListWheelChildLoopingListDelegate extends CircleListChildDelegate {
  /// Constructs the delegate from a concrete list of children.
  CircleListWheelChildLoopingListDelegate({required this.children})
      : assert(children != null);

  /// The list containing all children that can be supplied.
  final List children;

  @override
  int? get estimatedChildCount => null;

  @override
  int trueIndexOf(int index) => index % children.length;

  @override
  Widget? build(BuildContext context, int index) {
    if (children.isEmpty) return null;
    return IndexedSemantics(
        child: children[index % children.length], index: index);
  }

  @override
  bool shouldRebuild(
      covariant CircleListWheelChildLoopingListDelegate oldDelegate) {
    return children != oldDelegate.children;
  }
}