org.parres.whitenoise/lib/hooks/use_active_chat.dart

import 'dart:async' show Future;

import 'package:flutter/widgets.dart';
import 'package:flutter_hooks/flutter_hooks.dart';

void useActiveChat({
  required String groupId,
  required void Function(String) setActiveChat,
  required VoidCallback clearActiveChat,
  required void Function(String) cancelGroupNotifications,
}) {
  useEffect(() {
    Future.microtask(() {
      setActiveChat(groupId);
      cancelGroupNotifications(groupId);
    });
    return null;
  }, [groupId]);

  useOnAppLifecycleStateChange((previous, current) {
    switch (current) {
      case AppLifecycleState.resumed:
        Future.microtask(() {
          setActiveChat(groupId);
          cancelGroupNotifications(groupId);
        });
      case AppLifecycleState.paused:
      case AppLifecycleState.inactive:
      case AppLifecycleState.hidden:
      case AppLifecycleState.detached:
        Future.microtask(clearActiveChat);
    }
  });
}