From 9543c47900b9c1344f0469efc8ba7919f0fca1ca Mon Sep 17 00:00:00 2001
From: Haocen <Haocen@users.noreply.github.com>
Date: Tue, 13 Sep 2022 08:34:44 -0400
Subject: [PATCH] Use Events class for handling visibilitychange

---
 client/scripts/ui.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/client/scripts/ui.js b/client/scripts/ui.js
index 7fff1f7..426bbc9 100644
--- a/client/scripts/ui.js
+++ b/client/scripts/ui.js
@@ -438,10 +438,10 @@ class Notifications {
         const visibilitychangeHandler = () => {                             
             if (document.visibilityState === 'visible') {    
                 notification.close();
-                document.removeEventListener('visibilitychange', visibilitychangeHandler);
+                Events.off('visibilitychange', visibilitychangeHandler);
             }                                                       
         };                                                                                
-        document.addEventListener('visibilitychange', visibilitychangeHandler);
+        Events.on('visibilitychange', visibilitychangeHandler);
 
         return notification;
     }