131 lines
3.7 KiB
Dart
131 lines
3.7 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:hooks_riverpod/hooks_riverpod.dart';
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import 'package:dio/dio.dart';
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import 'package:island/models/post.dart';
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import 'package:island/pods/network.dart';
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import 'package:island/widgets/post/post_item.dart';
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import 'package:styled_widget/styled_widget.dart';
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import 'package:very_good_infinite_list/very_good_infinite_list.dart';
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// State class to hold posts and pagination info
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class PostListState {
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final List<SnPost> posts;
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final bool isLoading;
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final String? error;
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final int total;
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final bool hasMore;
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const PostListState({
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this.posts = const [],
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this.isLoading = false,
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this.error,
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this.total = 0,
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this.hasMore = true,
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});
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PostListState copyWith({
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List<SnPost>? posts,
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bool? isLoading,
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String? error,
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int? total,
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bool? hasMore,
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}) {
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return PostListState(
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posts: posts ?? this.posts,
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isLoading: isLoading ?? this.isLoading,
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error: error,
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total: total ?? this.total,
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hasMore: hasMore ?? this.hasMore,
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);
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}
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}
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// Provider for managing post list state
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final postListProvider =
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StateNotifierProvider.family<PostListNotifier, PostListState, String?>((
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ref,
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pubName,
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) {
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final dio = ref.watch(apiClientProvider);
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return PostListNotifier(dio, pubName);
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});
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class PostListNotifier extends StateNotifier<PostListState> {
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final Dio _dio;
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final String? pubName;
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static const int _pageSize = 20;
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PostListNotifier(this._dio, this.pubName) : super(const PostListState()) {
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loadInitialPosts();
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}
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Future<void> loadInitialPosts() async {
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state = state.copyWith(isLoading: true, error: null);
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try {
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final result = await _fetchPosts(0);
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state = PostListState(
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posts: result.posts,
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total: result.total,
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hasMore: result.posts.length < result.total,
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isLoading: false,
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);
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} catch (e) {
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state = state.copyWith(isLoading: false, error: e.toString());
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}
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}
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Future<void> loadMorePosts() async {
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if (state.isLoading || !state.hasMore) return;
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state = state.copyWith(isLoading: true, error: null);
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try {
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final result = await _fetchPosts(state.posts.length);
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state = state.copyWith(
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posts: [...state.posts, ...result.posts],
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total: result.total,
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hasMore: state.posts.length + result.posts.length < result.total,
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isLoading: false,
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);
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} catch (e) {
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state = state.copyWith(isLoading: false, error: e.toString());
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}
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}
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Future<({List<SnPost> posts, int total})> _fetchPosts(int offset) async {
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final queryParams = {
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'offset': offset,
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'take': _pageSize,
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if (pubName != null) 'pub': pubName,
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};
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final response = await _dio.get('/posts', queryParameters: queryParams);
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final total = int.parse(response.headers.value('X-Total') ?? '0');
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final List<dynamic> data = response.data;
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final posts = data.map((json) => SnPost.fromJson(json)).toList();
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return (posts: posts, total: total);
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}
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}
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class SliverPostList extends HookConsumerWidget {
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final String? pubName;
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const SliverPostList({super.key, this.pubName});
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@override
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Widget build(BuildContext context, WidgetRef ref) {
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final state = ref.watch(postListProvider(pubName));
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final notifier = ref.read(postListProvider(pubName).notifier);
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return SliverInfiniteList(
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onFetchData: notifier.loadMorePosts,
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itemCount: state.posts.length,
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hasReachedMax: !state.hasMore,
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isLoading: state.isLoading,
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itemBuilder: (context, index) {
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return PostItem(item: state.posts[index]);
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},
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separatorBuilder: (_, __) => const Divider(height: 1),
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);
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}
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}
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