From f0cf90df76693bc6f9ff039d5cfa9068ead60ddb Mon Sep 17 00:00:00 2001
From: ronnymikalsen <ronny.mikalsen@nasjonalbiblioteket.org>
Date: Fri, 26 Mar 2021 09:43:30 +0100
Subject: [PATCH] fix: removes resize event on destroy

---
 src/viewer.js | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/src/viewer.js b/src/viewer.js
index 98f8e484..f17621d6 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -220,6 +220,7 @@ $.Viewer = function( options ) {
     this._updateRequestId = null;
     this._loadQueue = [];
     this.currentOverlays = [];
+    this._updatePixelDensityRatioBind = null;
 
     this._lastScrollTime = $.now(); // variable used to help normalize the scroll event speed of different devices
 
@@ -426,8 +427,7 @@ $.Viewer = function( options ) {
         }
     }
 
-    // Add updatePixelDensityRatio to resize event
-    $.addEvent( window, 'resize', this._updatePixelDensityRatio.bind(this) );
+    this._addUpdatePixelDensityRatioEvent();
 
     //Instantiate a navigator if configured
     if ( this.showNavigator){
@@ -751,6 +751,8 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
             return;
         }
 
+        this._removeUpdatePixelDensityRatioEvent();
+
         this.close();
 
         this.clearOverlays();
@@ -2284,6 +2286,23 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
         } else {
             $.console.warn('Attempting to display a reference strip while "sequenceMode" is off.');
         }
+    },
+
+    /**
+     * Adds _updatePixelDensityRatio to the window resize event.
+     * @private
+     */
+    _addUpdatePixelDensityRatioEvent: function() {
+        this._updatePixelDensityRatioBind = this._updatePixelDensityRatio.bind(this);
+        $.addEvent( window, 'resize', this._updatePixelDensityRatioBind );
+    },
+
+    /**
+     * Removes _updatePixelDensityRatio from the window resize event.
+     * @private
+     */
+    _removeUpdatePixelDensityRatioEvent: function() {
+        $.removeEvent( window, 'resize', this._updatePixelDensityRatioBind );
     }
 });