Solian/lib/screens/explore.dart
2024-04-16 22:29:58 +08:00

107 lines
3.4 KiB
Dart

import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:solian/models/pagination.dart';
import 'package:solian/models/post.dart';
import 'package:solian/router.dart';
import 'package:solian/utils/service_url.dart';
import 'package:infinite_scroll_pagination/infinite_scroll_pagination.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';
import 'package:http/http.dart' as http;
import 'package:solian/widgets/indent_wrapper.dart';
import 'package:solian/widgets/posts/item.dart';
class ExploreScreen extends StatefulWidget {
const ExploreScreen({super.key});
@override
State<ExploreScreen> createState() => _ExploreScreenState();
}
class _ExploreScreenState extends State<ExploreScreen> {
final PagingController<int, Post> _pagingController = PagingController(firstPageKey: 0);
final http.Client _client = http.Client();
Future<void> fetchFeed(int pageKey) async {
final offset = pageKey;
const take = 5;
var uri = getRequestUri('interactive', '/api/feed?take=$take&offset=$offset');
var res = await _client.get(uri);
if (res.statusCode == 200) {
final result = PaginationResult.fromJson(jsonDecode(utf8.decode(res.bodyBytes)));
final items = result.data?.map((x) => Post.fromJson(x)).toList() ?? List.empty();
final isLastPage = (result.count - pageKey) < take;
if (isLastPage || result.data == null) {
_pagingController.appendLastPage(items);
} else {
final nextPageKey = pageKey + items.length;
_pagingController.appendPage(items, nextPageKey);
}
} else {
_pagingController.error = utf8.decode(res.bodyBytes);
}
}
@override
void initState() {
super.initState();
_pagingController.addPageRequestListener((pageKey) => fetchFeed(pageKey));
}
@override
Widget build(BuildContext context) {
return IndentWrapper(
noSafeArea: true,
floatingActionButton: FloatingActionButton(
child: const Icon(Icons.edit),
onPressed: () async {
final did = await router.pushNamed("posts.moments.editor");
if (did == true) _pagingController.refresh();
},
),
title: AppLocalizations.of(context)!.explore,
child: RefreshIndicator(
onRefresh: () => Future.sync(
() => _pagingController.refresh(),
),
child: Center(
child: Container(
constraints: const BoxConstraints(maxWidth: 640),
child: PagedListView<int, Post>.separated(
pagingController: _pagingController,
separatorBuilder: (context, index) => const Divider(thickness: 0.3),
builderDelegate: PagedChildBuilderDelegate<Post>(
itemBuilder: (context, item, index) => GestureDetector(
child: PostItem(
item: item,
onUpdate: () => _pagingController.refresh(),
),
onTap: () {
router.pushNamed(
'posts.screen',
pathParameters: {
'alias': item.alias,
'dataset': '${item.modelType}s',
},
);
},
),
),
),
),
),
),
);
}
@override
void dispose() {
_pagingController.dispose();
super.dispose();
}
}