ScrollViewerSelectorBehavior

ScrollViewerSelectorBehavior.cs

public class ScrollViewerSelectorBehavior : DependencyObject, IBehavior
{
  public DependencyObject AssociatedObject { get; private set; }

  private ScrollViewer AssociatedViewer
  {
    get { return (ScrollViewer)this.AssociatedObject; }
  }

  private Selector AssociatedSelector
  {
    get { return _associatedSelector ?? (_associatedSelector = this.AssociatedObject.GetFirstDescendantOfType<Selector>()); }
  }
  private Selector _associatedSelector;

  private CompositeDisposable disposer;

  public void Attach(DependencyObject associatedObject)
  {
    this.AssociatedObject = associatedObject as ScrollViewer;

    if (this.AssociatedObject == null)
    {
      Debug.WriteLine("Associated object is not ScrollViewer!");
      return;
    }

    AssociatedViewer.Loaded += OnLoaded;
    
    disposer = new CompositeDisposable();
  }

  public void Detach()
  {
    if (this.AssociatedObject == null)
      return;

    AssociatedViewer.Loaded -= OnLoaded;
    
    disposer.Dispose();
  }

  private void OnLoaded(object sender, RoutedEventArgs e)
  {

  }
}