Solian/lib/screens/explore.dart

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Dart
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import 'dart:convert';
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import 'package:flutter/material.dart';
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import 'package:provider/provider.dart';
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import 'package:solian/models/pagination.dart';
import 'package:solian/models/post.dart';
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import 'package:solian/providers/auth.dart';
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import 'package:solian/router.dart';
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import 'package:solian/utils/service_url.dart';
import 'package:infinite_scroll_pagination/infinite_scroll_pagination.dart';
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import 'package:flutter_gen/gen_l10n/app_localizations.dart';
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import 'package:http/http.dart' as http;
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import 'package:solian/widgets/indent_wrapper.dart';
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import 'package:solian/widgets/notification_notifier.dart';
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import 'package:solian/widgets/posts/item.dart';
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class ExploreScreen extends StatefulWidget {
const ExploreScreen({super.key});
@override
State<ExploreScreen> createState() => _ExploreScreenState();
}
class _ExploreScreenState extends State<ExploreScreen> {
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final PagingController<int, Post> _pagingController =
PagingController(firstPageKey: 0);
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final http.Client _client = http.Client();
Future<void> fetchFeed(int pageKey) async {
final offset = pageKey;
const take = 5;
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var uri =
getRequestUri('interactive', '/api/feed?take=$take&offset=$offset');
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var res = await _client.get(uri);
if (res.statusCode == 200) {
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final result =
PaginationResult.fromJson(jsonDecode(utf8.decode(res.bodyBytes)));
final items =
result.data?.map((x) => Post.fromJson(x)).toList() ?? List.empty();
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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);
}
}
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@override
void initState() {
super.initState();
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_pagingController.addPageRequestListener((pageKey) => fetchFeed(pageKey));
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}
@override
Widget build(BuildContext context) {
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final auth = context.read<AuthProvider>();
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return IndentWrapper(
noSafeArea: true,
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floatingActionButton: FutureBuilder(
future: auth.isAuthorized(),
builder: (context, snapshot) {
if (snapshot.hasData && snapshot.data!) {
return FloatingActionButton(
child: const Icon(Icons.edit),
onPressed: () async {
final did = await router.pushNamed("posts.moments.editor");
if (did == true) _pagingController.refresh();
},
);
} else {
return Container();
}
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},
),
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appBarActions: const [NotificationButton()],
title: AppLocalizations.of(context)!.explore,
child: RefreshIndicator(
onRefresh: () => Future.sync(
() => _pagingController.refresh(),
),
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child: PagedListView<int, Post>(
pagingController: _pagingController,
builderDelegate: PagedChildBuilderDelegate<Post>(
itemBuilder: (context, item, index) => PostItem(
item: item,
onUpdate: () => _pagingController.refresh(),
onTap: () {
router.pushNamed(
'posts.screen',
pathParameters: {
'alias': item.alias,
'dataset': '${item.modelType}s',
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},
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);
},
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),
),
),
),
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);
}
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@override
void dispose() {
_pagingController.dispose();
super.dispose();
}
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}