381 lines
12 KiB
Dart
381 lines
12 KiB
Dart
import 'dart:math' show max;
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import 'package:cached_network_image/cached_network_image.dart';
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import 'package:flutter/cupertino.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter_hooks/flutter_hooks.dart';
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import 'package:lemmy_api_client/v2.dart';
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import '../hooks/infinite_scroll.dart';
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import '../hooks/memo_future.dart';
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import '../hooks/stores.dart';
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import '../util/goto.dart';
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import '../widgets/bottom_modal.dart';
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import '../widgets/infinite_scroll.dart';
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import '../widgets/post.dart';
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import '../widgets/post_list_options.dart';
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import 'add_account.dart';
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import 'inbox.dart';
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/// First thing users sees when opening the app
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/// Shows list of posts from all or just specific instances
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class HomeTab extends HookWidget {
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const HomeTab();
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@override
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Widget build(BuildContext context) {
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final accStore = useAccountsStore();
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final selectedList = useState(_SelectedList(
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listingType: accStore.hasNoAccount
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? PostListingType.all
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: PostListingType.subscribed));
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final isc = useInfiniteScrollController();
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final theme = Theme.of(context);
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final instancesIcons = useMemoFuture(() async {
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final instances = accStore.instances.toList(growable: false);
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final sites = await Future.wait(instances
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.map((e) => LemmyApiV2(e).run(GetSite()).catchError((e) => null)));
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return {
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for (var i = 0; i < sites.length; i++)
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instances[i]: sites[i].siteView.site.icon
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};
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});
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// if the current SelectedList points to something that no longer exists
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// switch it to something else
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// cases include:
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// - listingType == subscribed on an instance that has no longer a logged in account
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// - instanceHost of a removed instance
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useEffect(() {
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if (accStore.isAnonymousFor(selectedList.value.instanceHost) &&
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selectedList.value.listingType == PostListingType.subscribed ||
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!accStore.instances.contains(selectedList.value.instanceHost)) {
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selectedList.value = _SelectedList(
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listingType: accStore.hasNoAccount
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? PostListingType.all
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: PostListingType.subscribed,
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);
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}
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return null;
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}, [
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accStore.isAnonymousFor(selectedList.value.instanceHost),
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accStore.hasNoAccount,
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accStore.instances.length,
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]);
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handleListChange() async {
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final val = await showModalBottomSheet<_SelectedList>(
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backgroundColor: Colors.transparent,
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isScrollControlled: true,
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context: context,
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builder: (context) {
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pop(_SelectedList thing) => Navigator.of(context).pop(thing);
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return BottomModal(
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child: Column(
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children: [
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const SizedBox(height: 5),
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const ListTile(
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title: Text('EVERYTHING'),
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dense: true,
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contentPadding: EdgeInsets.zero,
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visualDensity:
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VisualDensity(vertical: VisualDensity.minimumDensity),
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leading: SizedBox.shrink(),
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),
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ListTile(
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title: Text(
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'Subscribed',
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style: TextStyle(
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color: accStore.hasNoAccount
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? theme.textTheme.bodyText1.color.withOpacity(0.4)
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: null,
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),
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),
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onTap: accStore.hasNoAccount
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? null
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: () => pop(
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const _SelectedList(
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listingType: PostListingType.subscribed,
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),
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),
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leading: const SizedBox(width: 20),
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),
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for (final listingType in [
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PostListingType.local,
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PostListingType.all,
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])
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ListTile(
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title: Text(listingType.value),
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leading: const SizedBox(width: 20, height: 20),
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onTap: () => pop(_SelectedList(listingType: listingType)),
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),
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for (final instance in accStore.instances) ...[
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const Padding(
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padding: EdgeInsets.symmetric(horizontal: 10),
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child: Divider(),
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),
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ListTile(
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title: Text(
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instance.toUpperCase(),
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style: TextStyle(
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color:
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theme.textTheme.bodyText1.color.withOpacity(0.7)),
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),
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onTap: () => goToInstance(context, instance),
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dense: true,
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contentPadding: EdgeInsets.zero,
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visualDensity: const VisualDensity(
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vertical: VisualDensity.minimumDensity),
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leading: (instancesIcons.hasData &&
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instancesIcons.data[instance] != null)
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? Padding(
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padding: const EdgeInsets.only(left: 20),
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child: SizedBox(
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width: 25,
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height: 25,
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child: CachedNetworkImage(
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imageUrl: instancesIcons.data[instance],
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height: 25,
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width: 25,
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),
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),
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)
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: const SizedBox(width: 30),
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),
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ListTile(
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title: Text(
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'Subscribed',
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style: TextStyle(
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color: accStore.isAnonymousFor(instance)
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? theme.textTheme.bodyText1.color.withOpacity(0.4)
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: null),
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),
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onTap: accStore.isAnonymousFor(instance)
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? () => showCupertinoModalPopup(
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context: context,
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builder: (_) =>
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AddAccountPage(instanceHost: instance))
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: () => pop(_SelectedList(
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listingType: PostListingType.subscribed,
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instanceHost: instance,
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)),
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leading: const SizedBox(width: 20),
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),
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ListTile(
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title: const Text('Local'),
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onTap: () => pop(_SelectedList(
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listingType: PostListingType.local,
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instanceHost: instance,
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)),
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leading: const SizedBox(width: 20),
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),
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ListTile(
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title: const Text('All'),
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onTap: () => pop(_SelectedList(
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listingType: PostListingType.all,
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instanceHost: instance,
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)),
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leading: const SizedBox(width: 20),
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),
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]
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],
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),
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);
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},
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);
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if (val != null) {
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selectedList.value = val;
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isc.clear();
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}
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}
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final title = () {
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final first = selectedList.value.listingType.value;
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final last = selectedList.value.instanceHost == null
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? ''
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: '@${selectedList.value.instanceHost}';
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return '$first$last';
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}();
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if (accStore.instances.isEmpty) {
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return Scaffold(
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body: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: const [
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Center(child: Text('there needs to be at least one instance')),
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],
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),
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);
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}
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return Scaffold(
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// TODO: make appbar autohide when scrolling down
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appBar: AppBar(
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actions: [
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IconButton(
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icon: const Icon(Icons.notifications),
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onPressed: () => goTo(context, (_) => const InboxPage()),
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)
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],
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centerTitle: true,
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title: TextButton(
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style: TextButton.styleFrom(
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shape: const RoundedRectangleBorder(
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borderRadius: BorderRadius.all(Radius.circular(10))),
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padding: const EdgeInsets.symmetric(horizontal: 15),
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primary: theme.buttonColor,
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textStyle: theme.primaryTextTheme.headline6,
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),
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onPressed: handleListChange,
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child: Row(
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mainAxisSize: MainAxisSize.min,
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Flexible(
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child: Text(
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title,
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style: theme.primaryTextTheme.headline6,
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overflow: TextOverflow.ellipsis,
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),
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),
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Icon(
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Icons.arrow_drop_down,
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color: theme.primaryTextTheme.headline6.color,
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),
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],
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),
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),
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),
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body: InfiniteHomeList(
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controller: isc,
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selectedList: selectedList.value,
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),
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);
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}
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}
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/// Infinite list of posts
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class InfiniteHomeList extends HookWidget {
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final Function onStyleChange;
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final InfiniteScrollController controller;
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final _SelectedList selectedList;
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const InfiniteHomeList({
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@required this.selectedList,
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this.onStyleChange,
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this.controller,
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}) : assert(selectedList != null);
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@override
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Widget build(BuildContext context) {
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final accStore = useAccountsStore();
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final sort = useState(SortType.active);
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void changeSorting(SortType newSort) {
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sort.value = newSort;
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controller.clear();
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}
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/// fetches post from many instances at once and combines them into a single
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/// list
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///
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/// Process of combining them works sort of like zip function in python
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Future<List<PostView>> generalFetcher(
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int page,
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int limit,
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SortType sort,
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PostListingType listingType,
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) async {
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assert(
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listingType != PostListingType.community, 'only subscribed or all');
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final instances = () {
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if (listingType == PostListingType.all) {
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return accStore.instances;
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} else {
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return accStore.loggedInInstances;
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}
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}();
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final futures =
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instances.map((instanceHost) => LemmyApiV2(instanceHost).run(GetPosts(
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type: listingType,
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sort: sort,
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page: page,
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limit: limit,
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auth: accStore.defaultTokenFor(instanceHost)?.raw,
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)));
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final posts = await Future.wait(futures);
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final newPosts = <PostView>[];
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final longest = posts.map((e) => e.length).reduce(max);
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for (var i = 0; i < longest; i++) {
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for (final el in posts) {
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if (el.elementAt(i) != null) {
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newPosts.add(el[i]);
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}
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}
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}
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return newPosts;
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}
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Future<List<PostView>> Function(int, int) fetcherFromInstance(
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String instanceHost, PostListingType listingType, SortType sort) =>
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(page, batchSize) => LemmyApiV2(instanceHost).run(GetPosts(
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type: listingType,
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sort: sort,
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page: page,
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limit: batchSize,
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auth: accStore.defaultTokenFor(instanceHost)?.raw,
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));
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return InfiniteScroll<PostView>(
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prepend: Column(
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children: [
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PostListOptions(
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onChange: changeSorting,
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styleButton: onStyleChange != null,
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),
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],
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),
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builder: (post) => Column(
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children: [
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PostWidget(post),
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const SizedBox(height: 20),
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],
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),
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padding: EdgeInsets.zero,
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fetchMore: selectedList.instanceHost == null
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? (page, limit) =>
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generalFetcher(page, limit, sort.value, selectedList.listingType)
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: fetcherFromInstance(
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selectedList.instanceHost,
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selectedList.listingType,
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sort.value,
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),
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controller: controller,
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batchSize: 20,
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);
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}
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}
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class _SelectedList {
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/// when null it implies the 'EVERYTHING' mode
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final String instanceHost;
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final PostListingType listingType;
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const _SelectedList({
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@required this.listingType,
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this.instanceHost,
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}) : assert(listingType != null);
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String toString() =>
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'SelectedList(instanceHost: $instanceHost, listingType: $listingType)';
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}
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