/// <summary>
/// Returns a collection of the sibling elements before this node, in document order.
/// </summary>
public static IEnumerable <DependencyObject> ElementsBeforeSelf(this DependencyObject item)
{
if (item.Ancestors().FirstOrDefault() == null)
{
yield break;
}
foreach (var child in item.Ancestors().First().Elements())
{
if (child.Equals(item))
{
break;
}
yield return(child);
}
}
/// <summary>
/// Returns a collection containing this element and all ancestor elements.
/// </summary>
public static IEnumerable <DependencyObject> AncestorsAndSelf(this DependencyObject item)
{
yield return(item);
foreach (var ancestor in item.Ancestors())
{
yield return(ancestor);
}
}
/// <summary>
/// Returns a collection of the after elements after this node, in document order.
/// </summary>
public static IEnumerable <DependencyObject> ElementsAfterSelf(this DependencyObject item)
{
if (item.Ancestors().FirstOrDefault() == null)
{
yield break;
}
bool afterSelf = false;
foreach (var child in item.Ancestors().First().Elements())
{
if (afterSelf)
{
yield return(child);
}
if (child.Equals(item))
{
afterSelf = true;
}
}
}
public static T AncestorsFind <T>(this DependencyObject item) where T : DependencyObject
{
return(item.Ancestors <T>().FirstOrDefault() as T);
}
/// <summary>
/// Returns a collection of ancestor elements which match the given type.
/// </summary>
public static IEnumerable <DependencyObject> Ancestors <T>(this DependencyObject item)
{
return(item.Ancestors().Where(i => i is T));
}
