4C/GummingCommon/Utilities/FixedScrollingGridView.cs

namespace GummingCommon
{
    using System.Windows;
    using System.Windows.Controls;
    using System.Windows.Data;
    using System.Windows.Media;

    public enum SelectiveScrollingOrientation
    {
        None,
        Horizontal,
        Vertical,
        Both
    }

    public static class ListViewHelper
    {
        /// <summary>
        /// Okay, I know this methods cause stack overflow.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="element"></param>
        /// <returns></returns>
        public static T FindAncestor<T>(this DependencyObject element)
            where T : DependencyObject
        {
            if (element == null)
            {
                return null;
            }

            DependencyObject ancestor = VisualTreeHelper.GetParent(element);

            if (element is FrameworkElement)
            {
                ancestor = ancestor ?? ((element as FrameworkElement).Parent ?? (element as FrameworkElement).TemplatedParent);
            }

            return ancestor is T ? ancestor as T : FindAncestor<T>(ancestor);
        }
    }

    public class FixedScrollingGridView : Grid
    {
        public static SelectiveScrollingOrientation GetSelectiveScrollingOrientation(DependencyObject obj)
        {
            return (SelectiveScrollingOrientation)obj.GetValue(SelectiveScrollingOrientationProperty);
        }

        public static void SetSelectiveScrollingOrientation(DependencyObject obj, SelectiveScrollingOrientation value)
        {
            obj.SetValue(SelectiveScrollingOrientationProperty, value);
        }

        // Using a DependencyProperty as the backing store for SelectiveScrollingOrientation.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty SelectiveScrollingOrientationProperty =
            DependencyProperty.RegisterAttached("SelectiveScrollingOrientation", typeof(SelectiveScrollingOrientation), typeof(FixedScrollingGridView), new UIPropertyMetadata(SelectiveScrollingOrientation.Both, new PropertyChangedCallback(OnSelectiveScrollingOrientationChanged)));

        private static void OnSelectiveScrollingOrientationChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            UIElement element = d as UIElement;
            SelectiveScrollingOrientation newValue = (SelectiveScrollingOrientation)e.NewValue;
            ScrollViewer viewer = element.FindAncestor<ScrollViewer>();
            if ((viewer != null) && (element != null))
            {
                Transform renderTransform = element.RenderTransform;
                if (renderTransform != null)
                {
                    BindingOperations.ClearBinding(renderTransform, TranslateTransform.XProperty);
                    BindingOperations.ClearBinding(renderTransform, TranslateTransform.YProperty);
                }
                if (newValue == SelectiveScrollingOrientation.Both)
                {
                    element.RenderTransform = null;
                }
                else
                {
                    TranslateTransform target = new TranslateTransform();
                    if (newValue != SelectiveScrollingOrientation.Horizontal)
                    {
                        Binding binding = new Binding("ContentHorizontalOffset");
                        binding.Source = viewer;
                        BindingOperations.SetBinding(target, TranslateTransform.XProperty, binding);
                    }
                    if (newValue != SelectiveScrollingOrientation.Vertical)
                    {
                        Binding binding2 = new Binding("ContentVerticalOffset");
                        binding2.Source = viewer;
                        BindingOperations.SetBinding(target, TranslateTransform.YProperty, binding2);
                    }
                    element.RenderTransform = target;
                }
            }
        }
    }
}