feat: Implement room themes

lib/pages/chat/chat_view.dart

@@ -1,3 +1,5 @@
+import 'package:fluffychat/utils/room_theme_extension.dart';
+import 'package:fluffychat/utils/string_color.dart';
 import 'package:flutter/material.dart';
 
 import 'package:badges/badges.dart';
@@ -128,7 +130,6 @@ class ChatView extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final theme = Theme.of(context);
     if (controller.room.membership == Membership.invite) {
       showFutureLoadingDialog(
         context: context,
@@ -154,9 +155,21 @@ class ChatView extends StatelessWidget {
         stream: controller.room.client.onRoomState.stream
             .where((update) => update.roomId == controller.room.id)
             .rateLimit(const Duration(seconds: 1)),
-        builder: (context, snapshot) => FutureBuilder(
+        builder: (context, snapshot) {
+          final roomTheme = controller.room.roomTheme;
+          final roomColor = roomTheme?.color;
+          final roomWallpaper =
+              roomTheme?.wallpaper ?? accountConfig.wallpaperUrl;
+          return Theme(
+            data: Theme.of(context).copyWith(
+              colorScheme: roomColor == null
+                  ? null
+                  : ColorScheme.fromSeed(seedColor: roomColor),
+            ),
+            child: FutureBuilder(
               future: controller.loadTimelineFuture,
               builder: (BuildContext context, snapshot) {
+                final theme = Theme.of(context);
                 var appbarBottomHeight = 0.0;
                 if (controller.room.pinnedEventIds.isNotEmpty) {
                   appbarBottomHeight += ChatAppBarListTile.fixedHeight;
@@ -188,10 +201,12 @@ class ChatView extends StatelessWidget {
                                 .client
                                 .onSync
                                 .stream
-                            .where((syncUpdate) => syncUpdate.hasRoomUpdate),
+                                .where(
+                                    (syncUpdate) => syncUpdate.hasRoomUpdate),
                             builder: (context, _) => UnreadRoomsBadge(
                               filter: (r) => r.id != controller.roomId,
-                          badgePosition: BadgePosition.topEnd(end: 8, top: 4),
+                              badgePosition:
+                                  BadgePosition.topEnd(end: 8, top: 4),
                               child: const Center(child: BackButton()),
                             ),
                           ),
@@ -260,11 +275,11 @@ class ChatView extends StatelessWidget {
                     onDragExited: controller.onDragExited,
                     child: Stack(
                       children: <Widget>[
-                    if (accountConfig.wallpaperUrl != null)
+                        if (roomWallpaper != null)
                           Opacity(
                             opacity: accountConfig.wallpaperOpacity ?? 1,
                             child: MxcImage(
-                          uri: accountConfig.wallpaperUrl,
+                              uri: roomWallpaper,
                               fit: BoxFit.cover,
                               isThumbnail: true,
                               width: FluffyThemes.columnWidth * 4,
@@ -282,7 +297,8 @@ class ChatView extends StatelessWidget {
                                     builder: (context) {
                                       if (controller.timeline == null) {
                                         return const Center(
-                                      child: CircularProgressIndicator.adaptive(
+                                          child: CircularProgressIndicator
+                                              .adaptive(
                                             strokeWidth: 2,
                                           ),
                                         );
@@ -308,11 +324,13 @@ class ChatView extends StatelessWidget {
                                   alignment: Alignment.center,
                                   child: Material(
                                     clipBehavior: Clip.hardEdge,
-                                color: theme.colorScheme.surfaceContainerHigh,
+                                    color:
+                                        theme.colorScheme.surfaceContainerHigh,
                                     borderRadius: const BorderRadius.all(
                                       Radius.circular(24),
                                     ),
-                                child: controller.room.isAbandonedDMRoom == true
+                                    child: controller.room.isAbandonedDMRoom ==
+                                            true
                                         ? Row(
                                             mainAxisAlignment:
                                                 MainAxisAlignment.spaceEvenly,
@@ -342,7 +360,8 @@ class ChatView extends StatelessWidget {
                                                 icon: const Icon(
                                                   Icons.forum_outlined,
                                                 ),
-                                            onPressed: controller.recreateChat,
+                                                onPressed:
+                                                    controller.recreateChat,
                                                 label: Text(
                                                   L10n.of(context).reopenChat,
                                                 ),
@@ -366,7 +385,8 @@ class ChatView extends StatelessWidget {
                         ),
                         if (controller.dragging)
                           Container(
-                        color: theme.scaffoldBackgroundColor.withOpacity(0.9),
+                            color:
+                                theme.scaffoldBackgroundColor.withOpacity(0.9),
                             alignment: Alignment.center,
                             child: const Icon(
                               Icons.upload_outlined,
@@ -379,6 +399,8 @@ class ChatView extends StatelessWidget {
                 );
               },
             ),
+          );
+        },
       ),
     );
   }

lib/utils/room_theme_extension.dart

@@ -0,0 +1,48 @@
+import 'package:async/async.dart';
+import 'package:flutter/widgets.dart';
+import 'package:matrix/matrix.dart' hide Result;
+
+extension RoomThemeExtension on Room {
+  static const String typeKey = 'im.fluffychat.room.theme';
+
+  MatrixRoomTheme? get roomTheme {
+    final content = getState(typeKey)?.content;
+    if (content == null) return null;
+
+    return MatrixRoomTheme.fromJson(content);
+  }
+
+  Future<void> setRoomTheme(MatrixRoomTheme theme) =>
+      client.setRoomStateWithKey(
+        id,
+        typeKey,
+        '',
+        theme.toJson(),
+      );
+}
+
+class MatrixRoomTheme {
+  final Color? color;
+  final Uri? wallpaper;
+
+  const MatrixRoomTheme({required this.color, required this.wallpaper});
+
+  factory MatrixRoomTheme.fromJson(Map<String, Object?> json) {
+    final colorString = json.tryGet<String>('color');
+    final colorInt = colorString == null ? null : int.tryParse(colorString);
+    final color =
+        colorInt == null ? null : Result(() => Color(colorInt)).asValue?.value;
+    final wallpaperString = json.tryGet<String>('wallpaper');
+    final wallpaper =
+        wallpaperString == null ? null : Uri.tryParse(wallpaperString);
+
+    return MatrixRoomTheme(
+      color: color,
+      wallpaper: wallpaper,
+    );
+  }
+  Map<String, Object?> toJson() => {
+        if (color != null) 'color': color?.value,
+        if (wallpaper != null) 'wallpaper': wallpaper?.toString(),
+      };
+}