From 18e4801ed003870cb939b13a7e9c6b7a7e65104d Mon Sep 17 00:00:00 2001
From: Tung Huynh <31434093+huynhsontung@users.noreply.github.com>
Date: Sun, 28 Jan 2024 15:42:39 -0800
Subject: [PATCH] fix alternate alyout not updating on in some cases (#317)

---
 .../Interactions/AlternatingListViewBehavior.cs   | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/Screenbox/Controls/Interactions/AlternatingListViewBehavior.cs b/Screenbox/Controls/Interactions/AlternatingListViewBehavior.cs
index e49ab38ee..90ae63592 100644
--- a/Screenbox/Controls/Interactions/AlternatingListViewBehavior.cs
+++ b/Screenbox/Controls/Interactions/AlternatingListViewBehavior.cs
@@ -54,9 +54,20 @@ protected override void OnAttached()
 
             AssociatedObject.ActualThemeChanged += OnActualThemeChanged;
             AssociatedObject.ContainerContentChanging += OnContainerContentChanging;
-            if (AssociatedObject.Items != null)
+            if (AssociatedObject.Items == null) return;
+            AssociatedObject.Items.VectorChanged += ItemsOnVectorChanged;
+            if (AssociatedObject.Items.Count > 0)
             {
-                AssociatedObject.Items.VectorChanged += ItemsOnVectorChanged;
+                // Update alternate layout on attached if there are items.
+                // Item containers may be cached if the list is previously loaded
+                // and ContainerContentChanging event is not triggered.
+                for (int i = 0; i < AssociatedObject.Items.Count; i++)
+                {
+                    if (AssociatedObject.ContainerFromIndex(i) is SelectorItem itemContainer)
+                    {
+                        UpdateAlternateLayout(itemContainer, i);
+                    }
+                }
             }
         }