Initial commit: 风影 OA 全栈源码（API/Web/Flutter/IM）

含 Phase 1.1 IM seq 排序、断线重连、多端已读同步与微信式语音转文字 UI。排除 node_modules、构建产物、安装包与 .env 密钥。 Co-authored-by: Cursor <cursoragent@cursor.com>
2026-09-02 10:04:03 +00:00
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+import 'dart:async';
+
+import 'package:connectivity_plus/connectivity_plus.dart';
+import 'package:flutter/widgets.dart';
+
+import '../session/session.dart';
+
+/// 监听网络切换与应用恢复，触发 IM 极速重连。
+class ImLifecycle with WidgetsBindingObserver {
+  ImLifecycle(this.session);
+  final SessionStore session;
+  StreamSubscription<List<ConnectivityResult>>? _netSub;
+  List<ConnectivityResult> _lastNet = const [];
+
+  void start() {
+    WidgetsBinding.instance.addObserver(this);
+    _netSub = Connectivity().onConnectivityChanged.listen(_onNet);
+    Connectivity().checkConnectivity().then((r) => _lastNet = r);
+  }
+
+  void stop() {
+    WidgetsBinding.instance.removeObserver(this);
+    _netSub?.cancel();
+    _netSub = null;
+  }
+
+  void _onNet(List<ConnectivityResult> next) {
+    final wasOffline = _lastNet.every((e) => e == ConnectivityResult.none);
+    final nowOnline = next.any((e) => e != ConnectivityResult.none);
+    _lastNet = next;
+    if (wasOffline && nowOnline && session.signedIn) {
+      unawaited(session.connectIm(force: true));
+    }
+  }
+
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    if (state == AppLifecycleState.resumed && session.signedIn) {
+      unawaited(session.connectIm(force: true));
+    }
+  }
+}