From f29d050e73c0144909757c085bf6bcd5a156f7ae Mon Sep 17 00:00:00 2001
From: Max Katz <maxkatz6@outlook.com>
Date: Sat, 15 May 2021 20:53:45 -0400
Subject: [PATCH] Add BoxShadows transition

---
 .../Transitions/BoxShadowsTransition.cs       | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 src/Avalonia.Visuals/Animation/Transitions/BoxShadowsTransition.cs

diff --git a/src/Avalonia.Visuals/Animation/Transitions/BoxShadowsTransition.cs b/src/Avalonia.Visuals/Animation/Transitions/BoxShadowsTransition.cs
new file mode 100644
index 0000000000..008613fb40
--- /dev/null
+++ b/src/Avalonia.Visuals/Animation/Transitions/BoxShadowsTransition.cs
@@ -0,0 +1,23 @@
+using System;
+using System.Reactive.Linq;
+
+using Avalonia.Animation.Animators;
+using Avalonia.Media;
+
+namespace Avalonia.Animation
+{
+    /// <summary>
+    /// Transition class that handles <see cref="AvaloniaProperty"/> with <see cref="BoxShadows"/> type.
+    /// </summary>  
+    public class BoxShadowsTransition : Transition<BoxShadows>
+    {
+        private static readonly BoxShadowsAnimator s_animator = new BoxShadowsAnimator();
+
+        /// <inheritdocs/>
+        public override IObservable<BoxShadows> DoTransition(IObservable<double> progress, BoxShadows oldValue, BoxShadows newValue)
+        {
+            return progress
+                .Select(progress => s_animator.Interpolate(Easing.Ease(progress), oldValue, newValue));
+        }
+    }
+}