System.Windows.Controls.VirtualizingStackPanel.GetIsVirtualizing C# (CSharp) Method

		public static bool GetIsVirtualizing (DependencyObject o)
		{
			if (o == null)
				throw new ArgumentNullException ("o");
			
			return (bool) o.GetValue (VirtualizingStackPanel.IsVirtualizingProperty);
		}
		

 /// <summary>
 /// Causes the object to scroll into view.
 /// </summary>
 /// <param name="item">Object to scroll.</param>
 public void ScrollIntoView(object item)
 {
     if ((null != TemplateScrollViewer) && Items.Contains(item))
     {
         // If the element is virtualizing we have to scroll to the index of the element
         // we've selected. This will force the virtualizing panel to rerender the required
         // elements.
         Rect itemsHostRect;
         Rect listBoxItemRect;
         bool virtualizing = VirtualizingStackPanel.GetIsVirtualizing(this);
         if (!IsOnCurrentPage(item, out itemsHostRect, out listBoxItemRect))
         {
             if (IsVerticalOrientation())
             {
                 if (virtualizing)
                 {
                     this.TemplateScrollViewer.ScrollToVerticalOffset(SelectedIndex);
                     return;
                 }
                 // Scroll into view vertically (first make the right bound visible, then the left)
                 double verticalOffset = TemplateScrollViewer.VerticalOffset;
                 double verticalDelta  = 0;
                 if (itemsHostRect.Bottom < listBoxItemRect.Bottom)
                 {
                     verticalDelta   = listBoxItemRect.Bottom - itemsHostRect.Bottom;
                     verticalOffset += verticalDelta;
                 }
                 if (listBoxItemRect.Top - verticalDelta < itemsHostRect.Top)
                 {
                     verticalOffset -= itemsHostRect.Top - (listBoxItemRect.Top - verticalDelta);
                 }
                 TemplateScrollViewer.ScrollToVerticalOffset(verticalOffset);
             }
             else
             {
                 if (virtualizing)
                 {
                     this.TemplateScrollViewer.ScrollToHorizontalOffset(SelectedIndex);
                     return;
                 }
                 // Scroll into view horizontally (first make the bottom bound visible, then the top)
                 double horizontalOffset = TemplateScrollViewer.HorizontalOffset;
                 double horizontalDelta  = 0;
                 if (itemsHostRect.Right < listBoxItemRect.Right)
                 {
                     horizontalDelta   = listBoxItemRect.Right - itemsHostRect.Right;
                     horizontalOffset += horizontalDelta;
                 }
                 if (listBoxItemRect.Left - horizontalDelta < itemsHostRect.Left)
                 {
                     horizontalOffset -= itemsHostRect.Left - (listBoxItemRect.Left - horizontalDelta);
                 }
                 TemplateScrollViewer.ScrollToHorizontalOffset(horizontalOffset);
             }
         }
     }
 }