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lib/pods/chat_rooms.dart

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+import "dart:async";
+import "package:flutter/material.dart";
+import "package:hooks_riverpod/hooks_riverpod.dart";
+
+final isSyncingProvider = StateProvider.autoDispose<bool>((ref) => false);
+
+final flashingMessagesProvider = StateProvider<Set<String>>((ref) => {});
+
+final appLifecycleStateProvider = StreamProvider<AppLifecycleState>((ref) {
+  final controller = StreamController<AppLifecycleState>();
+
+  final observer = _AppLifecycleObserver((state) {
+    if (controller.isClosed) return;
+    controller.add(state);
+  });
+  WidgetsBinding.instance.addObserver(observer);
+
+  ref.onDispose(() {
+    WidgetsBinding.instance.removeObserver(observer);
+    controller.close();
+  });
+
+  return controller.stream;
+});
+
+class _AppLifecycleObserver extends WidgetsBindingObserver {
+  final ValueChanged<AppLifecycleState> onChange;
+  _AppLifecycleObserver(this.onChange);
+
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    onChange(state);
+  }
+}