smart_scroll_refresh 1.1.0

smart_scroll_refresh: ^1.1.0 copied to clipboard

example/lib/main.dart

import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:smart_scroll_refresh/smart_scroll_refresh.dart';

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

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

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

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

  @override
  State<PicsumPaginationPage> createState() => _PicsumPaginationPageState();
}

class _PicsumPaginationPageState extends State<PicsumPaginationPage> {
  final List<String> _photos = [];
  int _page = 1;
  final int _limit = 10;
  bool _hasMore = true;
  bool _isFetching = false;

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

  Future<void> _fetchNextPage() async {
    if (_isFetching || !_hasMore) return;

    _isFetching = true;

    final url = Uri.parse(
      'https://picsum.photos/v2/list?page=$_page&limit=$_limit',
    );

    final response = await http.get(url);

    if (response.statusCode == 200) {
      final List data = jsonDecode(response.body);

      if (data.isEmpty) {
        _hasMore = false;
      } else {
        setState(() {
          _photos.addAll(data.map<String>((e) => e['download_url'] as String));
          _page++;
        });
      }
    } else {
      debugPrint('Failed to fetch photos: ${response.statusCode}');
    }

    _isFetching = false;
  }

  Future<void> _refreshData() async {
    if (_isFetching) return;
    _isFetching = true;

    try {
      final url = Uri.parse(
        'https://picsum.photos/v2/list?page=1&limit=$_limit',
      );

      final response = await http.get(url);

      if (response.statusCode == 200) {
        final List data = jsonDecode(response.body);

        if (mounted) {
          setState(() {
            _photos.clear();
            _photos.addAll(
              data.map<String>((e) => e['download_url'] as String),
            );
            _page = 2;
            _hasMore = data.isNotEmpty;
          });
        }
      } else {
        debugPrint('Failed to refresh photos: ${response.statusCode}');
      }
    } catch (e) {
      debugPrint('Error refreshing data: $e');
    } finally {
      _isFetching = false;
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Smart  Pagination')),
      body: PaginatedListView(
        enablePullToRefresh: true,
        onRefresh: _refreshData,
        itemCount: _photos.length,
        hasMore: _hasMore,
        onLoadMore: _fetchNextPage,
        itemBuilder: (context, index) {
          return Padding(
            padding: const EdgeInsets.all(8),
            child: ClipRRect(
              borderRadius: BorderRadius.circular(12),
              child: Image.network(
                _photos[index],
                height: 250,
                width: double.infinity,
                fit: BoxFit.cover,
                loadingBuilder: (context, child, progress) {
                  if (progress == null) return child;
                  return const SizedBox(
                    height: 250,
                    child: Center(child: CircularProgressIndicator()),
                  );
                },
              ),
            ),
          );
        },
      ),
    );
  }
}