/// <summary>
/// Will gather all children from this TreeElement which pass the provided filter
/// </summary>
/// <typeparam name="T">a generic TreeElement child class</typeparam>
/// <param name="element">the root element for the parsing</param>
/// <param name="filter">a filtering delegate</param>
/// <returns>an array of TreeElement as T type</returns>
public static T[] GetChildren <T>(this T rootElement, ChildFilter <T> filter) where T : TreeElement
{
List <T> children = new List <T>();
foreach (var child in rootElement.Children)
{
if (filter.Invoke(child as T))
{
children.Add(child as T);
}
children.AddRange(((T)child).GetChildren <T>(filter));
}
return(children.ToArray());
}
/// <summary>
/// This helper try to find an element with the provided id in this TreeElement's hierarchy, including itself
/// </summary>
/// <typeparam name="T">a TreeElement generic class</typeparam>
/// <param name="rootElement">the root element for the search</param>
/// <param name="filter">the filtering predicate</param>
/// <returns>casted TreeElement as T, or null if not found</returns>
public static T Find <T>(this T rootElement, ChildFilter <T> filter) where T : TreeElement
{
if (filter.Invoke(rootElement as T))
{
return(rootElement);
}
foreach (var child in rootElement.Children)
{
var itFound = ((T)child).Find <T>(filter);
if (itFound != null)
{
return(itFound);
}
}
return(null);
}