flutter_desktop_online_state: refactor connection page

Signed-off-by: fufesou <shuanglongchen@yeah.net>

flutter/lib/models/model.dart

@@ -21,6 +21,7 @@ import '../common.dart';
 import '../mobile/widgets/dialog.dart';
 import '../mobile/widgets/overlay.dart';
 import 'native_model.dart' if (dart.library.html) 'web_model.dart';
+import 'peer_model.dart';
 
 typedef HandleMsgBox = void Function(Map<String, dynamic> evt, String id);
 bool _waitForImage = false;
@@ -1092,7 +1093,7 @@ class FFI {
   Future<List<String>> getAudioInputs() async {
     return await bind.mainGetSoundInputs();
   }
-  
+
   String getDefaultAudioInput() {
     final input = getOption('audio-input');
     if (input.isEmpty && Platform.isWindows) {
@@ -1110,21 +1111,6 @@ class FFI {
   }
 }
 
-class Peer {
-  final String id;
-  final String username;
-  final String hostname;
-  final String platform;
-  final List<dynamic> tags;
-
-  Peer.fromJson(String id, Map<String, dynamic> json)
-      : id = id,
-        username = json['username'] ?? '',
-        hostname = json['hostname'] ?? '',
-        platform = json['platform'] ?? '',
-        tags = json['tags'] ?? [];
-}
-
 class Display {
   double x = 0;
   double y = 0;

flutter/lib/models/native_model.dart

@@ -6,6 +6,7 @@ import 'dart:typed_data';
 import 'package:device_info_plus/device_info_plus.dart';
 import 'package:external_path/external_path.dart';
 import 'package:ffi/ffi.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 import 'package:path_provider/path_provider.dart';
@@ -21,6 +22,7 @@ class RgbaFrame extends Struct {
 
 typedef F2 = Pointer<Utf8> Function(Pointer<Utf8>, Pointer<Utf8>);
 typedef F3 = void Function(Pointer<Utf8>, Pointer<Utf8>);
+typedef HandleEvent = void Function(Map<String, dynamic> evt);
 
 /// FFI wrapper around the native Rust core.
 /// Hides the platform differences.
@@ -30,6 +32,7 @@ class PlatformFFI {
   String _homeDir = '';
   F2? _getByName;
   F3? _setByName;
+  var _eventHandlers = Map<String, Map<String, HandleEvent>>();
   late RustdeskImpl _ffiBind;
   void Function(Map<String, dynamic>)? _eventCallback;
 
@@ -40,6 +43,31 @@ class PlatformFFI {
     return packageInfo.version;
   }
 
+  bool registerEventHandler(
+      String event_name, String handler_name, HandleEvent handler) {
+    debugPrint('registerEventHandler $event_name $handler_name');
+    var handlers = _eventHandlers[event_name];
+    if (handlers == null) {
+      _eventHandlers[event_name] = {handler_name: handler};
+      return true;
+    } else {
+      if (handlers.containsKey(handler_name)) {
+        return false;
+      } else {
+        handlers[handler_name] = handler;
+        return true;
+      }
+    }
+  }
+
+  void unregisterEventHandler(String event_name, String handler_name) {
+    debugPrint('unregisterEventHandler $event_name $handler_name');
+    var handlers = _eventHandlers[event_name];
+    if (handlers != null) {
+      handlers.remove(handler_name);
+    }
+  }
+
   /// Send **get** command to the Rust core based on [name] and [arg].
   /// Return the result as a string.
   String getByName(String name, [String arg = '']) {
@@ -138,6 +166,22 @@ class PlatformFFI {
     version = await getVersion();
   }
 
+  bool _tryHandle(Map<String, dynamic> evt) {
+    final name = evt['name'];
+    if (name != null) {
+      final handlers = _eventHandlers[name];
+      if (handlers != null) {
+        if (handlers.isNotEmpty) {
+          handlers.values.forEach((handler) {
+            handler(evt);
+          });
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+
   /// Start listening to the Rust core's events and frames.
   void _startListenEvent(RustdeskImpl rustdeskImpl) {
     () async {
@@ -145,7 +189,10 @@ class PlatformFFI {
         if (_eventCallback != null) {
           try {
             Map<String, dynamic> event = json.decode(message);
-            _eventCallback!(event);
+            // _tryHandle here may be more flexible than _eventCallback
+            if (!_tryHandle(event)) {
+              _eventCallback!(event);
+            }
           } catch (e) {
             print('json.decode fail(): $e');
           }

flutter/lib/models/peer_model.dart

@@ -0,0 +1,89 @@
+import 'package:flutter/foundation.dart';
+import '../../common.dart';
+
+class Peer {
+  final String id;
+  final String username;
+  final String hostname;
+  final String platform;
+  final List<dynamic> tags;
+  bool online = false;
+
+  Peer.fromJson(String id, Map<String, dynamic> json)
+      : id = id,
+        username = json['username'] ?? '',
+        hostname = json['hostname'] ?? '',
+        platform = json['platform'] ?? '',
+        tags = json['tags'] ?? [];
+
+  Peer({
+    required this.id,
+    required this.username,
+    required this.hostname,
+    required this.platform,
+    required this.tags,
+  });
+
+  Peer.loading()
+      : this(
+            id: '...',
+            username: '...',
+            hostname: '...',
+            platform: '...',
+            tags: []);
+}
+
+class Peers extends ChangeNotifier {
+  late String _name;
+  late var _peers;
+  static const cbQueryOnlines = 'callback_query_onlines';
+
+  Peers(String name, List<Peer> peers) {
+    _name = name;
+    _peers = peers;
+    gFFI.ffiModel.platformFFI.registerEventHandler(cbQueryOnlines, _name,
+        (evt) {
+      _updateOnlineState(evt);
+    });
+  }
+
+  List<Peer> get peers => _peers;
+
+  @override
+  void dispose() {
+    gFFI.ffiModel.platformFFI.unregisterEventHandler(cbQueryOnlines, _name);
+    super.dispose();
+  }
+
+  Peer getByIndex(int index) {
+    if (index < _peers.length) {
+      return _peers[index];
+    } else {
+      return Peer.loading();
+    }
+  }
+
+  int getPeersCount() {
+    return _peers.length;
+  }
+
+  void _updateOnlineState(Map<String, dynamic> evt) {
+    evt['onlines'].split(',').forEach((online) {
+      for (var i = 0; i < _peers.length; i++) {
+        if (_peers[i].id == online) {
+          _peers[i].online = true;
+        }
+      }
+    });
+
+    evt['offlines'].split(',').forEach((offline) {
+      for (var i = 0; i < _peers.length; i++) {
+        if (_peers[i].id == offline) {
+          _peers[i].online = false;
+        }
+      }
+    });
+
+    notifyListeners();
+  }
+}