⚡ Better last message preview

lib/providers/database/services/messages.dart

@@ -1,3 +1,6 @@
+import 'dart:convert';
+
+import 'package:collection/collection.dart';
 import 'package:drift/drift.dart';
 import 'package:get/get.dart' hide Value;
 import 'package:solian/exceptions/request.dart';
@@ -182,4 +185,26 @@ class MessagesFetchingProvider extends GetxController {
           ..orderBy([(t) => OrderingTerm.desc(t.id)]))
         .getSingleOrNull();
   }
+
+  Future<Map<int, List<LocalMessageEventTableData>>>
+      getLastInAllChannels() async {
+    final database = Get.find<DatabaseProvider>().database;
+    final rows = await database.customSelect('''
+    SELECT id, channel_id, data, created_at
+    FROM ${database.localMessageEventTable.actualTableName}
+    WHERE (channel_id, created_at) IN (
+      SELECT channel_id, MAX(created_at)
+      FROM ${database.localMessageEventTable.actualTableName}
+      GROUP BY channel_id
+    )
+    ''', readsFrom: {database.localMessageEventTable}).get();
+    return rows.map((row) {
+      return LocalMessageEventTableData(
+        id: row.read<int>('id'),
+        channelId: row.read<int>('channel_id'),
+        data: Event.fromJson(jsonDecode(row.read<String>('data'))),
+        createdAt: row.read<DateTime>('created_at'),
+      );
+    }).groupListsBy((x) => x.channelId);
+  }
 }

lib/screens/chat.dart

@@ -44,7 +44,16 @@ class _ChatScreenState extends State<ChatScreen> {
       color: Theme.of(context).colorScheme.surface,
       child: Scaffold(
         appBar: AppBar(
-          leading: AppBarLeadingButton.adaptive(context),
+          leading: Obx(() {
+            final adaptive = AppBarLeadingButton.adaptive(context);
+            if (adaptive != null) return adaptive;
+            if (_channels.isLoading.value) {
+              return const CircularProgressIndicator(
+                strokeWidth: 3,
+              ).paddingAll(18);
+            }
+            return const SizedBox.shrink();
+          }),
           title: AppBarTitle('chat'.tr),
           centerTitle: true,
           toolbarHeight: AppTheme.toolbarHeight(context),
@@ -110,13 +119,6 @@ class _ChatScreenState extends State<ChatScreen> {
 
           return Column(
             children: [
-              Obx(() {
-                if (_channels.isLoading.isFalse) {
-                  return const SizedBox.shrink();
-                } else {
-                  return const LinearProgressIndicator();
-                }
-              }),
               const ChatCallCurrentIndicator(),
               Expanded(
                 child: CenteredContainer(

lib/widgets/channel/channel_list.dart

@@ -7,6 +7,7 @@ import 'package:get/get.dart';
 import 'package:solian/controllers/chat_events_controller.dart';
 import 'package:solian/models/channel.dart';
 import 'package:solian/platform.dart';
+import 'package:solian/providers/database/database.dart';
 import 'package:solian/router.dart';
 import 'package:solian/widgets/account/account_avatar.dart';
 
@@ -38,8 +39,19 @@ class _ChannelListWidgetState extends State<ChannelListWidget> {
   final List<Channel> _globalChannels = List.empty(growable: true);
   final Map<String, List<Channel>> _inRealms = {};
 
+  Map<int, LocalMessageEventTableData>? _lastMessages;
+
   final ChatEventController _eventController = ChatEventController();
 
+  Future<void> _loadLastMessages() async {
+    final messages = await _eventController.src.getLastInAllChannels();
+    setState(() {
+      _lastMessages = messages
+          .map((k, v) => MapEntry(k, v.firstOrNull))
+          .cast<int, LocalMessageEventTableData>();
+    });
+  }
+
   void _mapChannels() {
     _inRealms.clear();
     _globalChannels.clear();
@@ -71,7 +83,9 @@ class _ChannelListWidgetState extends State<ChannelListWidget> {
   void initState() {
     super.initState();
     _mapChannels();
-    _eventController.initialize();
+    _eventController.initialize().then((_) {
+      _loadLastMessages();
+    });
   }
 
   void _gotoChannel(Channel item) {
@@ -98,32 +112,65 @@ class _ChannelListWidgetState extends State<ChannelListWidget> {
     }
   }
 
-  Widget _buildDirectMessageDescription(Channel item, ChannelMember otherside) {
+  Widget _buildChannelDescription(Channel item, ChannelMember? otherside) {
     if (PlatformInfo.isWeb) {
-      return Text('channelDirectDescription'.trParams(
+      return otherside != null
+          ? Text(
+              'channelDirectDescription'.trParams(
                 {'username': '@${otherside.account.name}'},
-      ));
-    }
-
-    return FutureBuilder(
-      future: Future.delayed(
-        const Duration(milliseconds: 500),
-        () => _eventController.src.getLastInChannel(item),
               ),
-      builder: (context, snapshot) {
-        if (!snapshot.hasData && snapshot.data == null) {
-          return Text('channelDirectDescription'.trParams(
-            {'username': '@${otherside.account.name}'},
-          ));
+              maxLines: 1,
+              overflow: TextOverflow.ellipsis,
+            )
+          : Text(
+              item.description,
+              maxLines: 1,
+              overflow: TextOverflow.ellipsis,
+            );
     }
 
-        final data = snapshot.data!.data!;
+    return AnimatedSwitcher(
+      switchInCurve: Curves.easeIn,
+      switchOutCurve: Curves.easeOut,
+      transitionBuilder: (child, animation) {
+        return FadeTransition(opacity: animation, child: child);
+      },
+      duration: const Duration(milliseconds: 300),
+      child: (_lastMessages == null || _lastMessages![item.id] == null)
+          ? Builder(builder: (context) {
+              return otherside != null
+                  ? Text(
+                      'channelDirectDescription'.trParams(
+                        {'username': '@${otherside.account.name}'},
+                      ),
+                      maxLines: 1,
+                      overflow: TextOverflow.ellipsis,
+                    )
+                  : Text(
+                      item.description,
+                      maxLines: 1,
+                      overflow: TextOverflow.ellipsis,
+                    );
+            })
+          : Builder(
+              builder: (context) {
+                final data = _lastMessages![item.id]!.data!;
                 return Text(
                   '${data.sender.account.nick}: ${data.body['text'] ?? 'Unsupported message to preview'}',
                   maxLines: 1,
                   overflow: TextOverflow.ellipsis,
                 );
               },
+            ),
+      layoutBuilder: (currentChild, previousChildren) {
+        return Stack(
+          alignment: Alignment.centerLeft,
+          children: <Widget>[
+            ...previousChildren,
+            if (currentChild != null) currentChild,
+          ],
+        );
+      },
     );
   }
 
@@ -157,9 +204,8 @@ class _ChannelListWidgetState extends State<ChannelListWidget> {
         leading: avatar,
         contentPadding: padding,
         title: Text(otherside.account.nick),
-        subtitle: !widget.isDense
-            ? _buildDirectMessageDescription(item, otherside)
-            : null,
+        subtitle:
+            !widget.isDense ? _buildChannelDescription(item, otherside) : null,
         onTap: () => _gotoChannel(item),
       );
     } else {
@@ -192,13 +238,7 @@ class _ChannelListWidgetState extends State<ChannelListWidget> {
         leading: avatar,
         contentPadding: padding,
         title: Text(item.name),
-        subtitle: !widget.isDense
-            ? Text(
-                item.description,
-                maxLines: 1,
-                overflow: TextOverflow.ellipsis,
-              )
-            : null,
+        subtitle: !widget.isDense ? _buildChannelDescription(item, null) : null,
         onTap: () => _gotoChannel(item),
       );
     }

lib/widgets/navigation/app_navigation.dart

@@ -14,16 +14,16 @@ abstract class AppNavigation {
       label: 'explore'.tr,
       page: 'explore',
     ),
-    AppNavigationDestination(
-      icon: const Icon(Icons.workspaces),
-      label: 'realms'.tr,
-      page: 'realms',
-    ),
     AppNavigationDestination(
       icon: const Icon(Icons.forum),
       label: 'chat'.tr,
       page: 'chat',
     ),
+    AppNavigationDestination(
+      icon: const Icon(Icons.workspaces),
+      label: 'realms'.tr,
+      page: 'realms',
+    ),
     AppNavigationDestination(
       icon: const AppAccountWidget(),
       label: 'account'.tr,

lib/widgets/navigation/realm_switcher.dart

@@ -75,6 +75,9 @@ class RealmSwitcher extends StatelessWidget {
             padding: EdgeInsets.symmetric(horizontal: 16),
             height: 48,
             width: 200,
+            decoration: BoxDecoration(
+              borderRadius: BorderRadius.all(Radius.circular(16)),
+            ),
           ),
           menuItemStyleData: const MenuItemStyleData(
             height: 48,