From 865efe41f7d4a66a1160dcbf339445df4fe06477 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20Hru=C5=A1ka?= <ondra@ondrovo.com>
Date: Mon, 18 Sep 2017 00:27:47 +0200
Subject: [PATCH] visibility api

---
 js/term_conn.js | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/js/term_conn.js b/js/term_conn.js
index e6276c8..e74ade6 100644
--- a/js/term_conn.js
+++ b/js/term_conn.js
@@ -19,15 +19,16 @@ module.exports = class TermConnection extends EventEmitter {
 
     this.pageShown = false
 
-    window.addEventListener('focus', () => {
-      console.info('Window got focus, re-connecting')
-      this.init()
-    })
-    window.addEventListener('blur', () => {
-      console.info('Window lost focus, freeing socket')
-      this.closeSocket()
-      clearTimeout(this.heartbeatTimeout)
-    })
+    document.addEventListener('visibilitychange', () => {
+      if (document.hidden === true) {
+        console.info('Window lost focus, freeing socket')
+        this.closeSocket()
+        clearTimeout(this.heartbeatTimeout)
+      } else {
+        console.info('Window got focus, re-connecting')
+        this.init()
+      }
+    }, false)
   }
 
   onWSOpen (evt) {