ScreenToGif/Util/ScrollSynchronizer.cs

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using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;

namespace ScreenToGif.Util
{
    public class ScrollSynchronizer : DependencyObject
    {
        /// <summary>
        /// Identifies the attached property ScrollGroup
        /// </summary>
        public static readonly DependencyProperty ScrollGroupProperty =
            DependencyProperty.RegisterAttached("ScrollGroup", typeof(string), typeof(ScrollSynchronizer), new PropertyMetadata(OnScrollGroupChanged));

        /// <summary>
        /// List of all registered scroll viewers.
        /// </summary>
        private static readonly Dictionary<ScrollViewer, string> ScrollViewers = new Dictionary<ScrollViewer, string>();

        /// <summary>
        /// Contains the latest horizontal scroll offset for each scroll group.
        /// </summary>
        private static readonly Dictionary<string, double> HorizontalScrollOffsets = new Dictionary<string, double>();

        /// <summary>
        /// Contains the latest vertical scroll offset for each scroll group.
        /// </summary>
        private static readonly Dictionary<string, double> VerticalScrollOffsets = new Dictionary<string, double>();

        /// <summary>
        /// Sets the value of the attached property ScrollGroup.
        /// </summary>
        /// <param name="obj">Object on which the property should be applied.</param>
        /// <param name="scrollGroup">Value of the property.</param>
        public static void SetScrollGroup(DependencyObject obj, string scrollGroup)
        {
            obj.SetValue(ScrollGroupProperty, scrollGroup);
        }

        /// <summary>
        /// Gets the value of the attached property ScrollGroup.
        /// </summary>
        /// <param name="obj">Object for which the property should be read.</param>
        /// <returns>Value of the property StartTime</returns>
        public static string GetScrollGroup(DependencyObject obj)
        {
            return (string)obj.GetValue(ScrollGroupProperty);
        }

        /// <summary>
        /// Occurs, when the ScrollGroupProperty has changed.
        /// </summary>
        /// <param name="d">The DependencyObject on which the property has changed value.</param>
        /// <param name="e">Event data that is issued by any event that tracks changes to the effective value of this property.</param>
        private static void OnScrollGroupChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var scrollViewer = d as ScrollViewer;

            if (scrollViewer != null)