lib/controllers/chat_history_controller.dart

@@ -10,16 +10,31 @@ class ChatHistoryController {
   final RxList<LocalMessage> currentHistory = RxList.empty(growable: true);
   final RxInt totalHistoryCount = 0.obs;
 
+  final RxBool isLoading = false.obs;
+
   initialize() async {
     database = await createHistoryDb();
     currentHistory.clear();
   }
 
   Future<void> getMessages(Channel channel, String scope) async {
-    totalHistoryCount.value = await database.syncMessages(channel, scope: scope);
+    totalHistoryCount.value =
+        await database.syncMessages(channel, scope: scope);
     await syncHistory(channel);
   }
 
+  Future<void> getMoreMessages(Channel channel, String scope) async {
+    isLoading.value = true;
+    totalHistoryCount.value = await database.syncMessages(
+      channel,
+      breath: 3,
+      scope: scope,
+      offset: currentHistory.length,
+    );
+    await syncHistory(channel);
+    isLoading.value = false;
+  }
+
   Future<void> syncHistory(Channel channel) async {
     currentHistory.replaceRange(0, currentHistory.length,
         await database.localMessages.findAllByChannel(channel.id));
@@ -27,7 +42,6 @@ class ChatHistoryController {
 
   receiveMessage(Message remote) async {
     final entry = await database.receiveMessage(remote);
-    totalHistoryCount.value++;
     currentHistory.add(entry);
   }
 
@@ -42,7 +56,6 @@ class ChatHistoryController {
 
   void burnMessage(int id) async {
     await database.burnMessage(id);
-    totalHistoryCount.value--;
     currentHistory.removeWhere((x) => x.id == id);
   }
 }

lib/providers/message/helper.dart

@@ -36,13 +36,13 @@ extension MessageHistoryHelper on MessageHistoryDb {
     await localMessages.delete(id);
   }
 
-  syncMessages(Channel channel, {String scope = 'global', offset = 0}) async {
+  syncMessages(Channel channel, {String scope = 'global', breath = 10, offset = 0}) async {
     final lastOne = await localMessages.findLastByChannel(channel.id);
 
     final data = await _getRemoteMessages(
       channel,
       scope,
-      remainBreath: 10,
+      remainBreath: breath,
       offset: offset,
       onBrake: (items) {
         return items.any((x) => x.id == lastOne?.id);

lib/screens/channel/channel_chat.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:ui';
 
 import 'package:flutter/material.dart';
+import 'package:flutter_animate/flutter_animate.dart';
 import 'package:get/get.dart';
 import 'package:solian/controllers/chat_history_controller.dart';
 import 'package:solian/exts.dart';
@@ -330,23 +331,41 @@ class _ChannelChatScreenState extends State<ChannelChatScreen> {
                     Obx(() {
                       final amount = _chatController.totalHistoryCount -
                           _chatController.currentHistory.length;
-                      if (amount > 0) {
+
+                      if (amount.value <= 0 ||
+                          _chatController.isLoading.isTrue) {
+                        return const SliverToBoxAdapter(child: SizedBox());
+                      }
+
                       return SliverToBoxAdapter(
                         child: ListTile(
-                            tileColor: Theme.of(context)
-                                .colorScheme
-                                .surfaceContainerLow,
+                          tileColor:
+                              Theme.of(context).colorScheme.surfaceContainerLow,
                           leading: const Icon(Icons.sync_disabled),
                           title: Text('messageUnsync'.tr),
                           subtitle: Text('messageUnsyncCaption'.trParams({
                             'count': amount.string,
                           })),
-                            onTap: () {},
+                          onTap: () {
+                            _chatController.getMoreMessages(
+                              _channel!,
+                              widget.realm,
+                            );
+                          },
                         ),
                       );
-                      } else {
+                    }),
+                    Obx(() {
+                      if (_chatController.isLoading.isFalse) {
                         return const SliverToBoxAdapter(child: SizedBox());
                       }
+
+                      return SliverToBoxAdapter(
+                        child: const LinearProgressIndicator()
+                            .animate()
+                            .slideY()
+                            .paddingOnly(bottom: 4),
+                      );
                     }),
                   ],
                 ),