/// <summary>
/// When overridden in a derived class, returns a <see cref="DataTemplate"/> based on custom logic.
/// </summary>
/// <param name="item">The data object for which to select the template.</param>
/// <param name="container">The data-bound object.</param>
/// <returns>
/// Returns a <see cref="DataTemplate"/> or null. The default value is null.
/// </returns>
public override DataTemplate SelectTemplate(object item, DependencyObject container)
{
var group = item as CollectionViewGroup;
if (group != null && group.IsBottomLevel)
{
var itemsControl = container.FindAncestor<ItemsControl>();
if (itemsControl != null)
{
var collectionView = itemsControl.Items as ICollectionView;
if (collectionView != null && collectionView.Groups.Count > 0 && !group.Equals(collectionView.Groups[0]))
{
return this.SeparatorTemplate;
}
}
}
return this.EmptyTemplate;
}
private static void SmoothDownPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ButtonBase container = d as ButtonBase;
if (container == null)
return;
Nullable<double> newvalue = (Nullable<double>)e.NewValue;
ScrollViewer sv = d.FindAncestor<ScrollViewer>();
if (sv == null)
return;
if (newvalue != null)
{
container.Command = RelayCommand.Instanciate(() => { SmoothDownPropertyChangedAction(sv, newvalue.Value); });
}
else
{
container.Command = null;
}
}
