show topics and summaries for spaces

lib/widgets/appbar.dart

@@ -13,6 +13,9 @@ final class const Appbar({
   final double? scrolledUnderElevation,
   final IList<Widget> actions = const .empty(),
   final VoidCallback? onTap,
+
+  /// Whether to show the minimize, maximize and close buttons on desktop.
+  final bool windowControls = true,
   super.key,
 }) extends ConsumerWidget implements PreferredSizeWidget {
   @override
@@ -50,7 +53,7 @@ final class const Appbar({
         flexibleSpace: GestureDetector(onDoubleTap: maximize),
         actions: [
           ...actions,
-          if (!(Platform.isAndroid || Platform.isIOS)) ...[
+          if (windowControls && !(Platform.isAndroid || Platform.isIOS)) ...[
             if (ref
                     .watch(SettingsController.provider)
                     .whenOrNull(

lib/widgets/room_appbar.dart

@@ -7,6 +7,7 @@ import "package:nexus/widgets/avatar_or_hash.dart";
 import "package:nexus/widgets/count_badge.dart";
 import "package:nexus/widgets/room_menu_button.dart";
 import "package:nexus/widgets/room_summary_sheet.dart";
+import "package:nexus/widgets/room_title.dart";
 import "package:nexus/widgets/sidebar.dart";
 
 final class const RoomAppbar({
@@ -30,17 +31,7 @@ final class const RoomAppbar({
       onTap: room?.metadata == null
           ? null
           : () => context.showAdaptiveSheet(
-              (context) => RoomSummarySheet(
-                .new(
-                  roomId: room!.metadata!.id,
-                  joinedMembers:
-                      room.metadata!.lazyLoadSummary?.joinedMemberCount,
-                  avatarUrl: room.metadata?.avatar,
-                  canonicalAlias: room.metadata?.canonicalAlias,
-                  name: room.metadata?.name,
-                  topic: room.metadata?.topic,
-                ),
-              ),
+              (context) => RoomSummarySheet(.fromMetadata(room!.metadata!)),
             ),
       leading: isDesktop
           ? room == null
@@ -62,24 +53,9 @@ final class const RoomAppbar({
       scrolledUnderElevation: 0,
       title: room == null
           ? null
-          : Column(
-              crossAxisAlignment: .start,
-              children: [
-                Text(
-                  room.metadata?.name ?? "Unnamed Room",
-                  overflow: .ellipsis,
-                  maxLines: 1,
-                ),
-                if (room.metadata?.topic?.isNotEmpty == true)
-                  Text(
-                    room.metadata!.topic!,
-                    maxLines: 1,
-                    overflow: .ellipsis,
-                    style: Theme.of(context).textTheme.labelMedium?.copyWith(
-                      color: Theme.of(context).colorScheme.onSurfaceVariant,
-                    ),
-                  ),
-              ],
+          : RoomTitle(
+              room.metadata?.name ?? "Unnamed Room",
+              topic: room.metadata?.topic,
             ),
       actions: .new(
         room == null

lib/widgets/room_list.dart

@@ -9,6 +9,8 @@ import "package:nexus/helpers/extensions/room_destinations.dart";
 import "package:nexus/helpers/extensions/show_adaptive_sheet.dart";
 import "package:nexus/widgets/adaptive_menu_button.dart";
 import "package:nexus/models/nav_page.dart";
+import "package:nexus/widgets/appbar.dart";
+import "package:nexus/widgets/room_title.dart";
 import "package:nexus/widgets/avatar_or_hash.dart";
 import "package:nexus/widgets/create_room_sheet.dart";
 import "package:nexus/widgets/start_dm_sheet.dart";
@@ -16,6 +18,7 @@ import "package:nexus/widgets/divider_widget.dart";
 import "package:nexus/widgets/error_dialog.dart";
 import "package:nexus/widgets/pages/settings.dart";
 import "package:nexus/widgets/join_sheet.dart";
+import "package:nexus/widgets/room_summary_sheet.dart";
 import "package:nexus/widgets/room_menu_button.dart";
 import "package:nexus/widgets/space_hierarchy_sheet.dart";
 import "package:nexus/controllers/key.dart";
@@ -232,25 +235,33 @@ class const RoomsPane({super.key}) extends ConsumerWidget {
       }),
     );
     final isDm = selectedSpace.id == "dms";
+    final spaceMetadata = selectedSpace.room?.metadata;
 
     return Scaffold(
       backgroundColor: Colors.transparent,
-      appBar: AppBar(
+      appBar: Appbar(
+        // Home and DMs aren't real spaces, so they don't have a summary.
+        onTap: spaceMetadata == null
+            ? null
+            : () => context.showAdaptiveSheet(
+                (_) => RoomSummarySheet(.fromMetadata(spaceMetadata)),
+              ),
+        windowControls: false,
         leading: AvatarOrHash(
-          selectedSpace.room?.metadata?.avatar,
+          spaceMetadata?.avatar,
           fallback: selectedSpace.icon == null
               ? null
               : Icon(selectedSpace.icon),
           selectedSpace.title,
         ),
-        title: Text(selectedSpace.title, overflow: .ellipsis),
+        title: RoomTitle(selectedSpace.title, topic: spaceMetadata?.topic),
         backgroundColor: Colors.transparent,
-        actions: [
+        actions: .new([
           RoomMenuButton(
             selectedSpace.room,
             children: selectedSpace.allChildRooms,
           ),
-        ],
+        ]),
       ),
       body: MaterialUiCompatibilityBridge(
         child: Builder(

lib/widgets/room_title.dart

@@ -0,0 +1,22 @@
+import "package:material_ui/material_ui.dart";
+
+/// A room or space's name, with its topic underneath if it has one, for app
+/// bars.
+class const RoomTitle(final String name, {final String? topic, super.key})
+    extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) => Column(
+    crossAxisAlignment: .start,
+    children: [
+      Text(name, overflow: .ellipsis, maxLines: 1),
+      if (topic?.isNotEmpty == true)
+        Text(
+          topic!,
+          maxLines: 1,
+          overflow: .ellipsis,
+          style: Theme.of(context).textTheme.labelMedium
+              ?.copyWith(color: Theme.of(context).colorScheme.onSurfaceVariant),
+        ),
+    ],
+  );
+}