✨ Typing indicator

lib/models/packet.dart

@@ -1,22 +1,26 @@
 class NetworkPackage {
   String method;
+  String? endpoint;
   String? message;
   Map<String, dynamic>? payload;
 
   NetworkPackage({
     required this.method,
+    this.endpoint,
     this.message,
     this.payload,
   });
 
   factory NetworkPackage.fromJson(Map<String, dynamic> json) => NetworkPackage(
         method: json['w'],
+        endpoint: json['e'],
         message: json['m'],
         payload: json['p'],
       );
 
   Map<String, dynamic> toJson() => {
         'w': method,
+        'e': endpoint,
         'm': message,
         'p': payload,
       };

lib/providers/websocket.dart

@@ -88,6 +88,7 @@ class WebSocketProvider extends GetxController {
     websocket?.stream.listen(
       (event) {
         final packet = NetworkPackage.fromJson(jsonDecode(event));
+        log('Websocket incoming message: ${packet.method} ${packet.message}');
         stream.sink.add(packet);
       },
       onDone: () {

lib/screens/channel/channel_chat.dart

@@ -24,6 +24,7 @@ import 'package:solian/widgets/channel/channel_call_indicator.dart';
 import 'package:solian/widgets/chat/call/chat_call_action.dart';
 import 'package:solian/widgets/chat/chat_event_list.dart';
 import 'package:solian/widgets/chat/chat_message_input.dart';
+import 'package:solian/widgets/chat/chat_typing_indicator.dart';
 import 'package:solian/widgets/current_state_action.dart';
 
 class ChannelChatScreen extends StatefulWidget {
@@ -103,12 +104,18 @@ class _ChannelChatScreenState extends State<ChannelChatScreen>
     setState(() => _isBusy = false);
   }
 
+  List<ChannelMember> _typingUsers = List.empty(growable: true);
+  Map<int, Timer> _typingInactiveTimer = {};
+
   void _listenMessages() {
-    final WebSocketProvider provider = Get.find();
+    final WebSocketProvider ws = Get.find();
-    _subscription = provider.stream.stream.listen((event) {
+    _subscription = ws.stream.stream.listen((event) {
       switch (event.method) {
         case 'events.new':
           final payload = Event.fromJson(event.payload!);
+          final typingIdx =
+              _typingUsers.indexWhere((x) => x.id == payload.senderId);
+          if (typingIdx != -1) _typingUsers.removeAt(typingIdx);
           _chatController.receiveEvent(payload);
           break;
         case 'calls.new':
@@ -123,6 +130,24 @@ class _ChannelChatScreenState extends State<ChannelChatScreen>
             setState(() => _ongoingCall = null);
           }
           break;
+        case 'status.typing':
+          if (event.payload?['channel_id'] != _channel!.id) break;
+          final member = ChannelMember.fromJson(event.payload!['member']);
+          if (!_typingUsers.any((x) => x.id == member.id)) {
+            setState(() {
+              _typingUsers.add(member);
+            });
+          }
+          _typingInactiveTimer[member.id]?.cancel();
+          _typingInactiveTimer[member.id] = Timer(
+            const Duration(seconds: 3),
+            () {
+              setState(() {
+                _typingUsers.removeWhere((x) => x.id == member.id);
+                _typingInactiveTimer.remove(member.id);
+              });
+            },
+          );
       }
     });
   }
@@ -280,7 +305,10 @@ class _ChannelChatScreenState extends State<ChannelChatScreen>
                     child: BackdropFilter(
                       filter: ImageFilter.blur(sigmaX: 50, sigmaY: 50),
                       child: SafeArea(
-                        child: ChatMessageInput(
+                        child: Column(
+                          children: [
+                            ChatTypingIndicator(users: _typingUsers),
+                            ChatMessageInput(
                               edit: _messageToEditing,
                               reply: _messageToReplying,
                               realm: widget.realm,
@@ -298,6 +326,8 @@ class _ChannelChatScreenState extends State<ChannelChatScreen>
                                 });
                               },
                             ),
+                          ],
+                        ),
                       ),
                     ),
                   ),
@@ -329,6 +359,9 @@ class _ChannelChatScreenState extends State<ChannelChatScreen>
 
   @override
   void dispose() {
+    for (var timer in _typingInactiveTimer.values) {
+      timer.cancel();
+    }
     _subscription?.cancel();
     WidgetsBinding.instance.removeObserver(this);
     super.dispose();

lib/translations/en_us.dart

@@ -385,4 +385,5 @@ const i18nEnglish = {
   'unknown': 'Unknown',
   'collapse': 'Collapse',
   'expand': 'Expand',
+  'typingMessage': '@user are typing...',
 };

lib/translations/zh_cn.dart

@@ -355,4 +355,5 @@ const i18nSimplifiedChinese = {
   'unknown': '未知',
   'collapse': '折叠',
   'expand': '展开',
+  'typingMessage': '@user 正在输入中…',
 };

lib/widgets/chat/chat_message_input.dart

@@ -1,3 +1,6 @@
+import 'dart:async';
+import 'dart:convert';
+
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_typeahead/flutter_typeahead.dart';
@@ -7,10 +10,12 @@ import 'package:solian/exts.dart';
 import 'package:solian/models/account.dart';
 import 'package:solian/models/channel.dart';
 import 'package:solian/models/event.dart';
+import 'package:solian/models/packet.dart';
 import 'package:solian/platform.dart';
 import 'package:solian/providers/attachment_uploader.dart';
 import 'package:solian/providers/auth.dart';
 import 'package:solian/providers/stickers.dart';
+import 'package:solian/providers/websocket.dart';
 import 'package:solian/widgets/account/account_avatar.dart';
 import 'package:solian/widgets/attachments/attachment_editor.dart';
 import 'package:solian/widgets/chat/chat_event.dart';
@@ -196,6 +201,36 @@ class _ChatMessageInputState extends State<ChatMessageInput> {
     }
   }
 
+  Timer? _typingNotifyTimer;
+  bool _typingStatus = false;
+
+  Future<void> _sendTypingStatus() async {
+    final WebSocketProvider ws = Get.find();
+    ws.websocket?.sink.add(jsonEncode(
+      NetworkPackage(
+        method: 'status.typing',
+        endpoint: 'messaging',
+        payload: {
+          'channel_id': widget.channel.id,
+        },
+      ).toJson(),
+    ));
+  }
+
+  void _pingEnterMessageStatus() {
+    if (!_typingStatus) {
+      _sendTypingStatus();
+      _typingStatus = true;
+    }
+
+    if (_typingNotifyTimer == null || !_typingNotifyTimer!.isActive) {
+      _typingNotifyTimer?.cancel();
+      _typingNotifyTimer = Timer(const Duration(milliseconds: 1850), () {
+        _typingStatus = false;
+      });
+    }
+  }
+
   void _resetInput() {
     if (widget.onReset != null) widget.onReset!();
     _editTo = null;
@@ -269,6 +304,20 @@ class _ChatMessageInputState extends State<ChatMessageInput> {
     super.didUpdateWidget(oldWidget);
   }
 
+  @override
+  void initState() {
+    super.initState();
+    _textController.addListener(_pingEnterMessageStatus);
+  }
+
+  @override
+  void dispose() {
+    _textController.removeListener(_pingEnterMessageStatus);
+    _textController.dispose();
+    _typingNotifyTimer?.cancel();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     final notifyBannerActions = [

lib/widgets/chat/chat_typing_indicator.dart

@@ -0,0 +1,58 @@
+import 'package:flutter/material.dart';
+import 'package:get/get.dart';
+import 'package:solian/models/channel.dart';
+
+class ChatTypingIndicator extends StatefulWidget {
+  final List<ChannelMember> users;
+
+  const ChatTypingIndicator({super.key, required this.users});
+
+  @override
+  State<ChatTypingIndicator> createState() => _ChatTypingIndicatorState();
+}
+
+class _ChatTypingIndicatorState extends State<ChatTypingIndicator>
+    with SingleTickerProviderStateMixin {
+  late final AnimationController _controller = AnimationController(
+    duration: const Duration(milliseconds: 250),
+    vsync: this,
+  );
+  late final Animation<double> _animation = CurvedAnimation(
+    parent: _controller,
+    curve: Curves.easeInOut,
+  );
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  void didUpdateWidget(covariant ChatTypingIndicator oldWidget) {
+    if (widget.users.isNotEmpty) {
+      _controller.animateTo(1);
+    } else {
+      _controller.animateTo(0);
+    }
+    super.didUpdateWidget(oldWidget);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return SizeTransition(
+      sizeFactor: _animation,
+      axis: Axis.vertical,
+      axisAlignment: -1,
+      child: Row(
+        children: [
+          const Icon(Icons.more_horiz),
+          const SizedBox(width: 6),
+          Text('typingMessage'.trParams({
+            'user': widget.users.map((x) => x.account.nick).join(', '),
+          })),
+        ],
+      ).paddingSymmetric(horizontal: 16),
+    );
+  }
+}