From a43c7fa7abea3daca0886ce8b9254b7a36b16600 Mon Sep 17 00:00:00 2001
From: Remy Sharp <remy@remysharp.com>
Date: Wed, 18 May 2016 13:12:55 +0100
Subject: [PATCH] fix: don't display install banner when installed

---
 app/scripts/app.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/app/scripts/app.js b/app/scripts/app.js
index 627fd5b..b34034f 100644
--- a/app/scripts/app.js
+++ b/app/scripts/app.js
@@ -14,6 +14,14 @@
         // app.baseUrl = '/polymer-starter-kit/';
     }
 
+    // don't display the install prompt if the user has *already* installed
+    window.addEventListener('beforeinstallprompt', function(event) {
+      if (window.matchMedia('(display-mode: standalone)').matches) {
+        return event.preventDefault();
+      }
+    });
+
+
     app.displayInstalledToast = function() {
         // Check to make sure caching is actually enabled—it won't be in the dev environment.
         if (!Polymer.dom(document).querySelector('platinum-sw-cache').disabled) {