From f2efed0d13c49afcd930f42350fa7a33738cd129 Mon Sep 17 00:00:00 2001
From: rabbitism <popmessiah@hotmail.com>
Date: Thu, 26 Dec 2024 17:24:02 +0800
Subject: [PATCH] fix: fix image binding to stretch initialization issue.

---
 src/Ursa/Controls/ImageViewer/ImageViewer.cs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Ursa/Controls/ImageViewer/ImageViewer.cs b/src/Ursa/Controls/ImageViewer/ImageViewer.cs
index e0abde2..021151f 100644
--- a/src/Ursa/Controls/ImageViewer/ImageViewer.cs
+++ b/src/Ursa/Controls/ImageViewer/ImageViewer.cs
@@ -163,8 +163,9 @@ public class ImageViewer: TemplatedControl
 
     private void OnStretchChanged(AvaloniaPropertyChangedEventArgs args)
     {
+        if (_image is null) return;
         var stretch = args.GetNewValue<Stretch>();
-        Scale = GetScaleRatio(Width / _image!.Width, Height / _image!.Height, stretch);
+        Scale = GetScaleRatio(Width / _image.Width, Height / _image.Height, stretch);
         _sourceMinScale = _image is not null ? Math.Min(Width * MinScale / _image.Width, Height * MinScale / _image.Height) : MinScale;
     }