From 38703b94232a562cfc20a7b50ca971e37a28bc43 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Fri, 2 Apr 2021 15:29:46 +0200
Subject: [PATCH] Fix pointer interaction with reversed direction slider.

Previously dragging a slider with `IsDirectionRevered = true` resulted in the slider moving the wrong way.
---
 src/Avalonia.Controls/Slider.cs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Avalonia.Controls/Slider.cs b/src/Avalonia.Controls/Slider.cs
index e02efc2bd2..6419981fb1 100644
--- a/src/Avalonia.Controls/Slider.cs
+++ b/src/Avalonia.Controls/Slider.cs
@@ -341,7 +341,9 @@ namespace Avalonia.Controls
 
             var pointNum = orient ? x.Position.X : x.Position.Y;
             var logicalPos = MathUtilities.Clamp(pointNum / pointDen, 0.0d, 1.0d);
-            var invert = orient ? 0 : 1;
+            var invert = orient ? 
+                IsDirectionReversed ? 1 : 0 :
+                IsDirectionReversed ? 0 : 1;
             var calcVal = Math.Abs(invert - logicalPos);
             var range = Maximum - Minimum;
             var finalValue = calcVal * range + Minimum;