Merge pull request #2845 from telerik/new-kb-kb-gridview-scroll-to-se…

…lection-925ba16afa314baea682fb05299cd295

Added new kb article kb-gridview-scroll-to-selection

knowledge-base/kb-gridview-scroll-to-selection.md

@@ -0,0 +1,84 @@
+---
+title: Programmatically Binding Selected Item Into View in RadGridView
+description: Bring the RadGridView selected item into view programmatically
+type: how-to
+page_title: Scroll Automatically to the Selected Row in RadGridView 
+slug: kb-gridview-scroll-to-selection
+tags: scroll,bring,into,view,selection
+res_type: kb
+---
+
+## Environment
+
+| Property | Value |
+| --- | --- |
+| Product | Progress® Telerik® UI for WPF |
+| Version | 2024.1.312 |
+
+## Description
+
+How to automatically scroll to the selected row in RadGridView for WPF.
+
+## Solution
+
+To do that, you can use the `SelectionChanged` event of `RadGridView`. In the event handler, you can access the `GridViewScrollViewer` control and call its `ScrollToVerticalOffset`. The offset can be calculated based on the index of the selected row multiplied by the `RowHeight` setting of the data grid.
+
+This approach can be wrapped in an attached property that can be re-used in multiple `RadGridView` instances.
+
+#### __[C#]__
+{{region kb-gridview-scroll-to-selection-0}}
+	public class GridViewUtilities
+	{
+		public static readonly DependencyProperty ScrollSelectedIntoViewProperty =
+			DependencyProperty.RegisterAttached("ScrollSelectedIntoView", typeof(bool), typeof(GridViewUtilities), new FrameworkPropertyMetadata(false, ScrollSelectedIntoViewPropertyChanged));
+
+		public static bool GetScrollSelectedIntoView(DependencyObject obj)
+		{
+			return (bool)obj.GetValue(ScrollSelectedIntoViewProperty);
+		}
+
+		public static void SetScrollSelectedIntoView(DependencyObject obj, bool value)
+		{
+			obj.SetValue(ScrollSelectedIntoViewProperty, value);
+		}
+
+		private static void ScrollSelectedIntoViewPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+		{
+			var gridView = (RadGridView)d;
+			if ((bool)e.NewValue)
+			{		
+				gridView.SelectionChanged += RadGridView_SelectionChanged;
+			}
+			else 
+			{
+				gridView.SelectionChanged -= RadGridView_SelectionChanged;
+			}
+		}
+
+		private static void RadGridView_SelectionChanged(object sender, SelectionChangeEventArgs e)
+		{    
+			var gridView = (RadGridView)sender;         
+			if (gridView.SelectedItem != null)
+			{
+				var scrollOffset = gridView.Items.IndexOf(gridView.SelectedItem) * gridView.RowHeight;
+				var scrollViewer = gridView.ChildrenOfType<GridViewScrollViewer>().First();
+				var svo = scrollViewer.VerticalOffset;
+				var svh = scrollViewer.ViewportHeight;
+
+				if(scrollOffset < svo || scrollOffset > (svo + svh))
+				{
+					scrollViewer.ScrollToVerticalOffset(scrollOffset);
+				}
+				else
+				{
+					scrollViewer.ScrollToVerticalOffset(svo);
+				}             
+			}
+		} 
+	}
+{{endregion}}
+
+#### __[XAML]__
+{{region kb-gridview-scroll-to-selection-1}}
+	<telerik:RadGridView local:GridViewUtilities.ScrollSelectedIntoView="True"/>
+{{endregion}}