From ef56dcacf07a715a7f20ff76a43de1f5b73b573d Mon Sep 17 00:00:00 2001
From: peerpalo <peerpalo@gmail.com>
Date: Thu, 7 Sep 2023 17:32:45 +0200
Subject: [PATCH] [ColorPicker]Scroll color history to top after choosing new
 color (#28291)

---
 .../Views/ColorEditorView.xaml.cs             | 29 ++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/src/modules/colorPicker/ColorPickerUI/Views/ColorEditorView.xaml.cs b/src/modules/colorPicker/ColorPickerUI/Views/ColorEditorView.xaml.cs
index 16cb80bf0d..ba17e3be86 100644
--- a/src/modules/colorPicker/ColorPickerUI/Views/ColorEditorView.xaml.cs
+++ b/src/modules/colorPicker/ColorPickerUI/Views/ColorEditorView.xaml.cs
@@ -2,8 +2,11 @@
 // The Microsoft Corporation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using System.ComponentModel;
+using System.Windows;
 using System.Windows.Controls;
 using ColorPicker.Helpers;
+using ColorPicker.ViewModels;
 
 namespace ColorPicker.Views
 {
@@ -12,8 +15,32 @@ namespace ColorPicker.Views
     /// </summary>
     public partial class ColorEditorView : UserControl
     {
-        public ColorEditorView() =>
+        public ColorEditorView()
+        {
             InitializeComponent();
+            Loaded += OnLoaded;
+        }
+
+        private void OnLoaded(object sender, RoutedEventArgs e)
+        {
+            EnableHistoryColorsScrollIntoView();
+        }
+
+        /// <summary>
+        /// Updating SelectedColorIndex will not refresh ListView viewport.
+        /// We listen for SelectedColorIndex property change and in case of a value <= 0 (new color is added) a call to ScrollIntoView is made so ListView will scroll up.
+        /// </summary>
+        private void EnableHistoryColorsScrollIntoView()
+        {
+            ColorEditorViewModel colorEditorViewModel = (ColorEditorViewModel)this.DataContext;
+            ((INotifyPropertyChanged)colorEditorViewModel).PropertyChanged += (sender, args) =>
+            {
+                if (args.PropertyName == nameof(colorEditorViewModel.SelectedColorIndex) && colorEditorViewModel.SelectedColorIndex <= 0)
+                {
+                    HistoryColors.ScrollIntoView(colorEditorViewModel.SelectedColor);
+                }
+            };
+        }
 
         private void HistoryColors_ItemClick(object sender, ModernWpf.Controls.ItemClickEventArgs e)
         {