Use hive for persisting data

Replace shared_preferences for saving settings
Threadstate saving proof of concept with scrolled-to post

.gitignore

@@ -96,4 +96,7 @@ app.*.symbols
 !**/ios/**/default.pbxuser
 !**/ios/**/default.perspectivev3
 !/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages
-!/dev/ci/**/Gemfile.lock
+!/dev/ci/**/Gemfile.lock
+
+# Generated model adapter classes (Hive)
+*.g.dart

lib/main.dart

@@ -1,3 +1,4 @@
+import 'package:chan/services/persistence.dart';
 import 'package:chan/services/settings.dart';
 import 'package:cupertino_back_gesture/cupertino_back_gesture.dart';
 import 'package:flutter/cupertino.dart';
@@ -7,7 +8,10 @@ import 'sites/4chan.dart';
 import 'pages/tab.dart';
 import 'package:provider/provider.dart';
 
-void main() => runApp(ChanApp());
+void main() async {
+	await Persistence.initialize();
+	runApp(ChanApp());
+}
 
 class ChanApp extends StatelessWidget {
 	@override
@@ -16,7 +20,7 @@ class ChanApp extends StatelessWidget {
 			backGestureWidth: BackGestureWidth.fraction(1),
 			child: MultiProvider(
 				providers: [
-					ChangeNotifierProvider<Settings>(create: (_) => Settings()),
+					ChangeNotifierProvider<EffectiveSettings>(create: (_) => EffectiveSettings()),
 					Provider<ImageboardSite>(create: (_) => Site4Chan(
 						baseUrl: 'boards.4chan.org',
 						sysUrl: 'sys.4chan.org',
@@ -29,7 +33,7 @@ class ChanApp extends StatelessWidget {
 				child: SettingsSystemListener(
 					child: Builder(
 						builder: (BuildContext context) {
-							final brightness = context.watch<Settings>().theme;
+							final brightness = context.watch<EffectiveSettings>().theme;
 							CupertinoThemeData theme = CupertinoThemeData(brightness: Brightness.light, primaryColor: Colors.black);
 							if (brightness == Brightness.dark) {
 								theme = CupertinoThemeData(brightness: Brightness.dark, scaffoldBackgroundColor: Color.fromRGBO(20, 20, 20, 1), primaryColor: Colors.white);

lib/main_desktop.dart

@@ -1,10 +1,12 @@
 // @dart=2.9
+import 'package:chan/services/persistence.dart';
 import 'package:flutter/foundation.dart' show debugDefaultTargetPlatformOverride;
 import 'package:flutter/material.dart';
 
 import './main.dart';
 
-void main() {
+void main() async {
 	debugDefaultTargetPlatformOverride = TargetPlatform.fuchsia;
+	await Persistence.initialize();
 	runApp(ChanApp());
 }

lib/models/post_element.dart

@@ -135,7 +135,7 @@ class PostQuoteLinkSpan extends PostSpan {
 		final sameAsParent = zone?.parentIds.contains(id) ?? false;
 		final postList = context.watch<List<Post>>();
 		final post = postList.firstWhere((p) => p.id == this.id);
-		final settings = context.watch<Settings>();
+		final settings = context.watch<EffectiveSettings>();
 		final newParentIds = (zone?.parentIds ?? []).followedBy([post.id]).toList();
 		return WidgetSpan(
 			child: HoverPopup(

lib/pages/board.dart

@@ -49,7 +49,7 @@ class BoardPage extends StatelessWidget {
 			),
 			child: RefreshableList<Thread>(
 				listUpdater: () => site.getCatalog(board.name).then((list) {
-					if (context.read<Settings>().hideStickiedThreads) {
+					if (context.read<EffectiveSettings>().hideStickiedThreads) {
 						return list.where((thread) => !thread.isSticky).toList();
 					}
 					else {

lib/pages/gallery.dart

@@ -113,7 +113,7 @@ class _GalleryPageState extends State<GalleryPage> {
 				}
 			});
 		});
-		if (context.read<Settings>().autoloadAttachments) {
+		if (context.read<EffectiveSettings>().autoloadAttachments) {
 			requestRealViewer(widget.attachments[currentIndex]);
 		}
 	}
@@ -213,7 +213,7 @@ class _GalleryPageState extends State<GalleryPage> {
 	void _animateToPage(int index, {int milliseconds = 200}) {
 		final attachment = widget.attachments[index];
 		widget.onChange?.call(attachment);
-		if (context.read<Settings>().autoloadAttachments && statuses[attachment]!.value is AttachmentUnloadedStatus) {
+		if (context.read<EffectiveSettings>().autoloadAttachments && statuses[attachment]!.value is AttachmentUnloadedStatus) {
 			requestRealViewer(widget.attachments[index]);
 		}
 		setState(() {
@@ -233,7 +233,7 @@ class _GalleryPageState extends State<GalleryPage> {
 	void _onPageChanged(int index) {
 		final attachment = widget.attachments[index];
 		widget.onChange?.call(attachment);
-		if (context.read<Settings>().autoloadAttachments && statuses[attachment]!.value is AttachmentUnloadedStatus) {
+		if (context.read<EffectiveSettings>().autoloadAttachments && statuses[attachment]!.value is AttachmentUnloadedStatus) {
 			requestRealViewer(widget.attachments[index]);
 		}
 		currentIndex = index;

lib/pages/settings.dart

@@ -10,7 +10,7 @@ import 'package:extended_image_library/extended_image_library.dart';
 class SettingsPage extends StatelessWidget {
 	@override
 	Widget build(BuildContext context) {
-		final settings = context.read<Settings>();
+		final settings = context.read<EffectiveSettings>();
 		return CupertinoPageScaffold(
 			navigationBar: CupertinoNavigationBar(
 				middle: Text('Settings')
@@ -23,30 +23,30 @@ class SettingsPage extends StatelessWidget {
 							padding: EdgeInsets.all(16),
 							child: Text('Theme'),
 						),
-						CupertinoSegmentedControl<Setting_Theme>(
+						CupertinoSegmentedControl<ThemeSetting>(
 							children: {
-								Setting_Theme.Light: Text('Light'),
-								Setting_Theme.System: Text('Follow System'),
-								Setting_Theme.Dark: Text('Dark')
+								ThemeSetting.Light: Text('Light'),
+								ThemeSetting.System: Text('Follow System'),
+								ThemeSetting.Dark: Text('Dark')
 							},
-							groupValue: settings.themePreference,
+							groupValue: settings.themeSetting,
 							onValueChanged: (newValue) {
-								settings.themePreference = newValue;
+								settings.themeSetting = newValue;
 							}
 						),
 						Container(
 							padding: EdgeInsets.all(16),
 							child: Text('Automatically load attachments'),
 						),
-						CupertinoSegmentedControl<Setting_AutoloadAttachments>(
+						CupertinoSegmentedControl<AutoloadAttachmentsSetting>(
 							children: {
-								Setting_AutoloadAttachments.Always: Text('Always'),
-								Setting_AutoloadAttachments.WiFi: Text('When on Wi-Fi'),
-								Setting_AutoloadAttachments.Never: Text('Never')
+								AutoloadAttachmentsSetting.Always: Text('Always'),
+								AutoloadAttachmentsSetting.WiFi: Text('When on Wi-Fi'),
+								AutoloadAttachmentsSetting.Never: Text('Never')
 							},
-							groupValue: settings.autoloadAttachmentsPreference,
+							groupValue: settings.autoloadAttachmentsSetting,
 							onValueChanged: (newValue) {
-								settings.autoloadAttachmentsPreference = newValue;
+								settings.autoloadAttachmentsSetting = newValue;
 							}
 						),
 						Container(
@@ -91,15 +91,15 @@ class _SettingsCachePanelState extends State<SettingsCachePanel> {
 	Future<void> _readFilesystemInfo() async {
 		folderSizes = {};
 		final systemTempDirectory = await getTemporaryDirectory();
-		await for (final directory in systemTempDirectory.list()) {
+		/*await for (final directory in systemTempDirectory.list()) {
 			if (directory is Directory) {
 				int size = 0;
 				await for (final subentry in directory.list(recursive: true)) {
 					size += (await subentry.stat()).size;
 				}
 				folderSizes![directory.path.split('/').last] = size;
 			}
-		}
+		}*/
 		setState(() {});
 	}
 

lib/pages/thread.dart

@@ -1,5 +1,6 @@
 import 'package:auto_size_text/auto_size_text.dart';
 import 'package:chan/models/attachment.dart';
+import 'package:chan/services/persistence.dart';
 import 'package:chan/sites/imageboard_site.dart';
 import 'package:chan/pages/gallery.dart';
 import 'package:chan/widgets/post_row.dart';
@@ -31,6 +32,7 @@ class ThreadPage extends StatefulWidget {
 }
 
 class _ThreadPageState extends State<ThreadPage> with TickerProviderStateMixin {
+	PersistentThreadState? persistentState;
 	Thread? thread;
 	bool showReplyBox = false;
 
@@ -40,6 +42,28 @@ class _ThreadPageState extends State<ThreadPage> with TickerProviderStateMixin {
 	@override
 	void initState() {
 		super.initState();
+		_getThreadState();
+		_listController.slowScrollUpdates.listen((_) {
+			persistentState?.lastSeenPostId = _listController.findNextMatch((_) => true)?.id;
+			persistentState?.save();
+		});
+	}
+
+	@override
+	void didUpdateWidget(ThreadPage old) {
+		super.didUpdateWidget(old);
+		if (widget.board != old.board || widget.id != old.id) {
+			setState(() {
+				thread = null;
+				persistentState = null;
+			});
+			_getThreadState();
+		}
+	}
+
+	Future<void> _getThreadState() async {
+		persistentState = await Persistence.getThreadState(widget.board.name, widget.id);
+		setState(() {});
 	}
 
 	void _showGallery({bool initiallyShowChrome = true, Attachment? initialAttachment}) {
@@ -105,8 +129,9 @@ class _ThreadPageState extends State<ThreadPage> with TickerProviderStateMixin {
 										autoUpdateDuration: const Duration(seconds: 60),
 										listUpdater: () async {
 											final _thread = await context.read<ImageboardSite>().getThread(widget.board.name, widget.id);
-											if (thread == null && widget.initialPostId != null) {
-												Future.delayed(Duration(milliseconds: 50), () => _listController.scrollToFirstMatching((post) => post.id == widget.initialPostId));
+											final int? scrollToId = widget.initialPostId ?? persistentState?.lastSeenPostId;
+											if (thread == null && scrollToId != null) {
+												Future.delayed(Duration(milliseconds: 50), () => _listController.scrollToFirstMatching((post) => post.id == scrollToId));
 											}
 											setState(() {
 												thread = _thread;
@@ -153,7 +178,7 @@ class _ThreadPageState extends State<ThreadPage> with TickerProviderStateMixin {
 							key: replyBoxKey,
 							board: widget.board,
 							threadId: widget.id,
-							onReplyPosted: (receipt) {
+							onReplyPosted: () {
 								setState(() {
 									showReplyBox = false;
 								});

lib/services/persistence.dart

@@ -0,0 +1,73 @@
+import 'package:chan/services/settings.dart';
+import 'package:hive/hive.dart';
+import 'package:hive_flutter/hive_flutter.dart';
+part 'persistence.g.dart';
+
+class Persistence {
+	static final threadStateBox = Hive.lazyBox<PersistentThreadState>('threadStates');
+
+	static Future<void> initialize() async {
+		await Hive.initFlutter();
+		Hive.registerAdapter(ThemeSettingAdapter());
+		Hive.registerAdapter(AutoloadAttachmentsSettingAdapter());
+		Hive.registerAdapter(SavedSettingsAdapter());
+		await Hive.openBox<SavedSettings>('settings');
+		Hive.registerAdapter(PostReceiptAdapter());
+		Hive.registerAdapter(PersistentThreadStateAdapter());
+		await Hive.openLazyBox<PersistentThreadState>('threadStates');
+	}
+
+	static Future<PersistentThreadState> getThreadState(String board, int id, {bool updateOpenedTime = false}) async {
+		final existingState = await threadStateBox.get('$board/$id');
+		if (existingState != null) {
+			if (updateOpenedTime) {
+				existingState.lastOpenedTime = DateTime.now();
+				await existingState.save();
+			}
+			return existingState;
+		}
+		else {
+			final newState = PersistentThreadState(
+				lastOpenedTime: updateOpenedTime ? DateTime.now() : null
+			);
+			threadStateBox.put('$board/$id', newState);
+			return newState;
+		}
+	}
+}
+
+@HiveType(typeId: 3)
+class PersistentThreadState extends HiveObject {
+	@HiveField(0)
+	int? lastSeenPostId;
+	@HiveField(1)
+	DateTime lastOpenedTime;
+	@HiveField(2)
+	bool watched;
+	@HiveField(3)
+	final List<PostReceipt> receipts;
+
+	PersistentThreadState({
+		this.lastSeenPostId,
+		DateTime? lastOpenedTime,
+		this.watched = false,
+		this.receipts = const []
+	}) : this.lastOpenedTime = lastOpenedTime ?? DateTime.now();
+
+	@override
+	String toString() => 'PersistentThreadState(lastSeenPostId: $lastSeenPostId, receipts: $receipts';
+}
+
+@HiveType(typeId: 4)
+class PostReceipt extends HiveObject {
+	@HiveField(0)
+	final String password;
+	@HiveField(1)
+	final int id;
+	PostReceipt({
+		required this.password,
+		required this.id
+	});
+	@override
+	String toString() => 'PostReceipt(id: $id, password: $password)';
+}