/// <summary>
/// Adds a handler for the element that is raised when the element is detached from a functional tree.
/// </summary>
public static void AddDetachedFromFunctionalTreeHandler(this IFunctionalTreeElement source, FunctionalTreeEventHandler handler)
{
if (source == null)
return;
if (handler == null)
throw new ArgumentNullException("handler", "handler is null.");
FunctionalTreeHelper.GetFunctionalTree(source).GetFunctionalElement(source).AddDetachedFromTreeHandler(handler);
}
internal void AddAttachedToTreeHandler(FunctionalTreeEventHandler handler)
{
if (AttachedToTreeHandlerList == null)
AttachedToTreeHandlerList = handler;
else
Delegate.Combine(AttachedToTreeHandlerList, handler);
//Handlers added to the root are different, since they're not fired on addChild/removeChild since they're not really added.
//That's why handlers from the root are fired right away
//TODO not sure
bool isFunctionalTreeRoot = Parent == null;
if (isFunctionalTreeRoot && handler != null)
handler(FunctionalTreeHelper.GetFunctionalTree(Element));
}
internal void RemoveDetachedFromTreeHandler(FunctionalTreeEventHandler handler)
{
if (DetachedFromTreeHandlerList != null)
Delegate.Remove(DetachedFromTreeHandlerList, handler);
}
internal void AddDetachedFromTreeHandler(FunctionalTreeEventHandler handler)
{
if (DetachedFromTreeHandlerList == null)
DetachedFromTreeHandlerList = handler;
else
Delegate.Combine(DetachedFromTreeHandlerList, handler);
}