From 49ee98bbb05f9a3749bd6a61e6bdf640036ec40d Mon Sep 17 00:00:00 2001
From: Ian Gilman <ian@iangilman.com>
Date: Thu, 3 Aug 2017 10:47:35 -0700
Subject: [PATCH] Fixed a problem with preventDefaultAction for the canvas-drag
 event

---
 changelog.txt | 1 +
 src/viewer.js | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/changelog.txt b/changelog.txt
index 531af964..7a04e821 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -4,6 +4,7 @@ OPENSEADRAGON CHANGELOG
 2.3.1: (In Progress)
 
 * Debug mode now uses different colors for different tiled images (customizable via debugGridColor) (#1271)
+* Fixed a problem with preventDefaultAction for the canvas-drag event ()
 
 2.3.0:
 
diff --git a/src/viewer.js b/src/viewer.js
index 649456de..0921eca8 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -2655,6 +2655,7 @@ function onCanvasDrag( event ) {
         originalEvent: event.originalEvent,
         preventDefaultAction: event.preventDefaultAction
     };
+
     /**
      * Raised when a mouse or touch drag operation occurs on the {@link OpenSeadragon.Viewer#canvas} element.
      *
@@ -2674,7 +2675,7 @@ function onCanvasDrag( event ) {
      */
     this.raiseEvent( 'canvas-drag', canvasDragEventArgs);
 
-    if ( !event.preventDefaultAction && this.viewport ) {
+    if ( !canvasDragEventArgs.preventDefaultAction && this.viewport ) {
         gestureSettings = this.gestureSettingsByDeviceType( event.pointerType );
         if( !this.panHorizontal ){
             event.delta.x = 0;