import 'dart:math' show max; import 'package:cached_network_image/cached_network_image.dart'; import 'package:flutter/cupertino.dart'; import 'package:flutter/material.dart'; import 'package:flutter_hooks/flutter_hooks.dart'; import 'package:lemmy_api_client/lemmy_api_client.dart'; import '../hooks/infinite_scroll.dart'; import '../hooks/memo_future.dart'; import '../hooks/stores.dart'; import '../util/goto.dart'; import '../widgets/bottom_modal.dart'; import '../widgets/infinite_scroll.dart'; import '../widgets/post.dart'; import '../widgets/post_list_options.dart'; import 'add_account.dart'; import 'inbox.dart'; /// First thing users sees when opening the app /// Shows list of posts from all or just specific instances class HomeTab extends HookWidget { @override Widget build(BuildContext context) { final selectedList = useState(_SelectedList(listingType: PostListingType.subscribed)); // TODO: needs to be an observer? for accounts changes final accStore = useAccountsStore(); final isc = useInfiniteScrollController(); final theme = Theme.of(context); final instancesIcons = useMemoFuture(() async { final map = {}; final instances = accStore.instances.toList(growable: false); final sites = await Future.wait(instances .map((e) => LemmyApi(e).v1.getSite().catchError((e) => null))); for (var i in Iterable.generate(sites.length)) { map[instances[i]] = sites[i].site.icon; } return map; }); handleListChange() async { final val = await showModalBottomSheet<_SelectedList>( backgroundColor: Colors.transparent, isScrollControlled: true, context: context, builder: (context) { pop(_SelectedList thing) => Navigator.of(context).pop(thing); return BottomModal( child: Column( children: [ SizedBox(height: 5), ListTile( title: Text('EVERYTHING'), dense: true, contentPadding: EdgeInsets.zero, visualDensity: VisualDensity(vertical: VisualDensity.minimumDensity), leading: SizedBox.shrink(), ), ListTile( title: Text('Subscribed'), leading: SizedBox(width: 20, height: 20), onTap: () => pop( _SelectedList(listingType: PostListingType.subscribed)), ), ListTile( title: Text('All'), leading: SizedBox(width: 20, height: 20), onTap: () => pop(_SelectedList(listingType: PostListingType.all)), ), for (final instance in accStore.instances) ...[ Padding( padding: const EdgeInsets.symmetric(horizontal: 10), child: Divider(), ), ListTile( title: Text( instance.toUpperCase(), style: TextStyle( color: theme.textTheme.bodyText1.color.withOpacity(0.7)), ), onTap: () => goToInstance(context, instance), dense: true, contentPadding: EdgeInsets.zero, visualDensity: VisualDensity(vertical: VisualDensity.minimumDensity), leading: (instancesIcons.hasData && instancesIcons.data[instance] != null) ? Padding( padding: const EdgeInsets.only(left: 20), child: SizedBox( width: 25, height: 25, child: CachedNetworkImage( imageUrl: instancesIcons.data[instance], height: 25, width: 25, ), ), ) : SizedBox(width: 30), ), ListTile( title: Text( 'Subscribed', style: TextStyle( color: accStore.isAnonymousFor(instance) ? theme.textTheme.bodyText1.color.withOpacity(0.4) : null), ), onTap: accStore.isAnonymousFor(instance) ? () => showCupertinoModalPopup( context: context, builder: (_) => AddAccountPage(instanceUrl: instance)) : () => pop(_SelectedList( listingType: PostListingType.subscribed, instanceUrl: instance, )), leading: SizedBox(width: 20), ), ListTile( title: Text('All'), onTap: () => pop(_SelectedList( listingType: PostListingType.all, instanceUrl: instance, )), leading: SizedBox(width: 20), ), ] ], ), ); }, ); if (val != null) { selectedList.value = val; isc.clear(); } } final title = () { final first = selectedList.value.listingType == PostListingType.subscribed ? 'Subscribed' : 'All'; final last = selectedList.value.instanceUrl == null ? '' : '@${selectedList.value.instanceUrl}'; return '$first$last'; }(); return Scaffold( // TODO: make appbar autohide when scrolling down appBar: AppBar( actions: [ IconButton( icon: Icon(Icons.notifications), onPressed: () => goTo(context, (_) => InboxPage()), ) ], centerTitle: true, title: TextButton( style: TextButton.styleFrom( shape: RoundedRectangleBorder( borderRadius: BorderRadius.all(Radius.circular(10))), padding: EdgeInsets.symmetric(horizontal: 15), primary: theme.buttonColor, textStyle: theme.primaryTextTheme.headline6, ), onPressed: handleListChange, child: Row( mainAxisSize: MainAxisSize.min, mainAxisAlignment: MainAxisAlignment.center, children: [ Flexible( child: Text( title, style: theme.primaryTextTheme.headline6, overflow: TextOverflow.ellipsis, ), ), Icon( Icons.arrow_drop_down, color: theme.primaryTextTheme.headline6.color, ), ], ), ), ), body: InfiniteHomeList( controller: isc, selectedList: selectedList.value, ), ); } } /// Infinite list of posts class InfiniteHomeList extends HookWidget { final Function onStyleChange; final InfiniteScrollController controller; final _SelectedList selectedList; InfiniteHomeList({ @required this.selectedList, this.onStyleChange, this.controller, }) : assert(selectedList != null); @override Widget build(BuildContext context) { final accStore = useAccountsStore(); final sort = useState(SortType.active); void changeSorting(SortType newSort) { sort.value = newSort; controller.clear(); } /// fetches post from many instances at once and combines them into a single /// list /// /// Process of combining them works sort of like zip function in python Future> generalFetcher( int page, int limit, SortType sort, PostListingType listingType, ) async { assert( listingType != PostListingType.community, 'only subscribed or all'); final instances = () { if (listingType == PostListingType.all) { return accStore.instances; } else { return accStore.loggedInInstances; } }(); final futures = instances.map((instanceUrl) => LemmyApi(instanceUrl).v1.getPosts( type: listingType, sort: sort, page: page, limit: limit, auth: accStore.defaultTokenFor(instanceUrl)?.raw, )); final posts = await Future.wait(futures); final newPosts = []; for (final i in Iterable.generate(posts.map((e) => e.length).reduce(max))) { for (final el in posts) { if (el.elementAt(i) != null) { newPosts.add(el[i]); } } } return newPosts; } Future> Function(int, int) fetcherFromInstance( String instanceUrl, PostListingType listingType, SortType sort) => (page, batchSize) => LemmyApi(instanceUrl).v1.getPosts( type: listingType, sort: sort, page: page, limit: batchSize, auth: accStore.defaultTokenFor(instanceUrl)?.raw, ); return InfiniteScroll( prepend: Column( children: [ PostListOptions( onChange: changeSorting, defaultSort: SortType.active, styleButton: onStyleChange != null, ), ], ), builder: (post) => Column( children: [ Post(post), SizedBox(height: 20), ], ), padding: EdgeInsets.zero, fetchMore: selectedList.instanceUrl == null ? (page, limit) => generalFetcher(page, limit, sort.value, selectedList.listingType) : fetcherFromInstance( selectedList.instanceUrl, selectedList.listingType, sort.value, ), controller: controller, batchSize: 20, ); } } class _SelectedList { final String instanceUrl; final PostListingType listingType; _SelectedList({ @required this.listingType, this.instanceUrl, }); String toString() => 'SelectedList({instanceUrl: $instanceUrl, listingType: $listingType})'; }