Daybreak/Daybreak/Behaviors/ScrollIntoView.cs

using Microsoft.Xaml.Behaviors;
using System;
using System.Extensions;
using System.Windows.Controls;

namespace Daybreak.Behaviors;

public class ScrollIntoView : Behavior<ListView>
{
    /// <summary>
    ///  When Beahvior is attached
    /// </summary>
    protected override void OnAttached()
    {
        base.OnAttached();
        this.AssociatedObject.SelectionChanged += this.AssociatedObject_SelectionChanged;
    }

    /// <summary>
    /// On Selection Changed
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    void AssociatedObject_SelectionChanged(object sender,
                                           SelectionChangedEventArgs e)
    {
        if (sender is ListView)
        {
            var listView = sender.As<ListView>()!;
            if (listView.SelectedItem != null)
            {
                listView.Dispatcher.BeginInvoke(
                    (Action)(() =>
                    {
                        listView.UpdateLayout();
                        if (listView.SelectedItem !=
                        null)
                            listView.ScrollIntoView(
                            listView.SelectedItem);
                    }));
            }
        }
    }
    /// <summary>
    /// When behavior is detached
    /// </summary>
    protected override void OnDetaching()
    {
        base.OnDetaching();
        this.AssociatedObject.SelectionChanged -=
            this.AssociatedObject_SelectionChanged;

    }
}