Fix BringIntoView for ItemsRepeater in ItemsRepeaterScrollHost

source/iNKORE.UI.WPF.Modern.Controls/Controls/Windows/Repeater/ItemsRepeater/ItemsRepeater.wpf.cs

@@ -1,5 +1,6 @@
 using System.Windows;
 using System.Windows.Controls;
+using System.Windows.Media;
 
 namespace iNKORE.UI.WPF.Modern.Controls
 {
@@ -27,6 +28,76 @@ protected override void OnChildDesiredSizeChanged(UIElement child)
             }
         }
 
+        // Default alignment for BringIntoView: 0.0 means align to top/left edge of viewport
+        private const double DefaultBringIntoViewAlignment = 0.0;
+
+        // Default offset for BringIntoView: no additional offset
+        private const double DefaultBringIntoViewOffset = 0.0;
+
+        // Default animation for BringIntoView: false for immediate scrolling
+        private const bool DefaultBringIntoViewAnimate = false;
+
+        protected override void OnRequestBringIntoView(RequestBringIntoViewEventArgs e)
+        {
+            // Forward the BringIntoView request to the ItemsRepeaterScrollHost if one exists.
+            // This enables BringIntoView to work properly with virtualized layouts like UniformGridLayout.
+            if (e.TargetObject != this && e.TargetObject is UIElement targetElement)
+            {
+                // Verify the target element is actually a descendant of this ItemsRepeater
+                if (!IsAncestorOf(targetElement))
+                {
+                    // Not our element, let the base class handle it
+                    base.OnRequestBringIntoView(e);
+                    return;
+                }
+
+                // Walk up the visual tree to find an ItemsRepeaterScrollHost
+                DependencyObject parent = this;
+                while (parent != null)
+                {
+                    parent = VisualTreeHelper.GetParent(parent);
+                    if (parent is ItemsRepeaterScrollHost scrollHost)
+                    {
+                        // Found a scroll host - forward the request to it.
+                        // Using alignment 0.0 means align to the top/left edge of the viewport.
+                        // The scroll host will calculate the correct scroll position based on
+                        // the element's layout bounds.
+                        scrollHost.StartBringIntoView(
+                            targetElement,
+                            alignmentX: DefaultBringIntoViewAlignment,
+                            alignmentY: DefaultBringIntoViewAlignment,
+                            offsetX: DefaultBringIntoViewOffset,
+                            offsetY: DefaultBringIntoViewOffset,
+                            animate: DefaultBringIntoViewAnimate);
+
+                        // Mark the event as handled so it doesn't bubble up further
+                        e.Handled = true;
+                        return;
+                    }
+                }
+            }
+
+            // No scroll host found, use default behavior
+            base.OnRequestBringIntoView(e);
+        }
+
+        private bool IsAncestorOf(DependencyObject descendant)
+        {
+            if (descendant == null)
+                return false;
+
+            DependencyObject current = descendant;
+            while (current != null)
+            {
+                if (current == this)
+                    return true;
+
+                current = VisualTreeHelper.GetParent(current);
+            }
+
+            return false;
+        }
+
         protected override UIElementCollection CreateUIElementCollection(FrameworkElement logicalParent)
         {
             return new RepeaterUIElementCollection(this, logicalParent);