From 409e2cd82f750d5f17895b631d301fa4b05927ad Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Wed, 6 Nov 2019 11:28:40 +0000
Subject: [PATCH] fix mouse wheel speed osx.

---
 native/Avalonia.Native/src/OSX/window.mm | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/native/Avalonia.Native/src/OSX/window.mm b/native/Avalonia.Native/src/OSX/window.mm
index 2a5acaea91..0e85332555 100644
--- a/native/Avalonia.Native/src/OSX/window.mm
+++ b/native/Avalonia.Native/src/OSX/window.mm
@@ -855,8 +855,15 @@ NSArray* AllLoopModes = [NSArray arrayWithObjects: NSDefaultRunLoopMode, NSEvent
     
     if(type == Wheel)
     {
-        delta.X = [event scrollingDeltaX] / 50;
-        delta.Y = [event scrollingDeltaY] / 50;
+        auto speed = 5;
+        
+        if([event hasPreciseScrollingDeltas])
+        {
+            speed = 50;
+        }
+        
+        delta.X = [event scrollingDeltaX] / speed;
+        delta.Y = [event scrollingDeltaY] / speed;
         
         if(delta.X == 0 && delta.Y == 0)
         {