From 7f6c14bdceb4064585d5f92d89fffc3d9335d8f8 Mon Sep 17 00:00:00 2001
From: infeng <fzhihao@outlook.com>
Date: Thu, 25 Jan 2018 10:07:56 +0800
Subject: [PATCH] fix: can not zoom with scroll in firefox

---
 src/ViewerCanvas.tsx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/ViewerCanvas.tsx b/src/ViewerCanvas.tsx
index 6b46017..a6d7981 100644
--- a/src/ViewerCanvas.tsx
+++ b/src/ViewerCanvas.tsx
@@ -96,7 +96,7 @@ export default class ViewerCanvas extends React.Component<ViewerCanvasProps, Vie
     if (e.wheelDelta) {
       direct = e.wheelDelta > 0 ? 1 : -1;
     }else if (e.detail) {
-      direct = e.detail > 0 ? 1 : -1;
+      direct = e.detail > 0 ? -1 : 1;
     }
     if (direct !== 0) {
       let pageX = e.pageX;
@@ -110,6 +110,7 @@ export default class ViewerCanvas extends React.Component<ViewerCanvasProps, Vie
     if (remove) {
       funcName = 'removeEventListener';
     }
+    document[funcName]('DOMMouseScroll', this.handleMouseScroll, false);
     document[funcName]('mousewheel', this.handleMouseScroll, false);
     document[funcName]('click', this.handleMouseUp, false);
     document[funcName]('mousemove', this.handleMouseMove, false);