public static IEnumerable <ILogical> GetSelfAndLogicalAncestors(this ILogical logical)
{
yield return(logical);
foreach (var ancestor in logical.GetLogicalAncestors())
{
yield return(ancestor);
}
}
public static IObservable <ILogical> Track(ILogical relativeTo, int ancestorLevel, Type ancestorType = null)
{
return(TrackAttachmentToTree(relativeTo).Select(isAttachedToTree =>
{
if (isAttachedToTree)
{
return relativeTo.GetLogicalAncestors()
.Where(x => ancestorType?.GetTypeInfo().IsAssignableFrom(x.GetType().GetTypeInfo()) ?? true)
.ElementAtOrDefault(ancestorLevel);
}
else
{
return null;
}
}));
}
private void Update()
{
_value = _relativeTo.GetLogicalAncestors()
.Where(x => _ancestorType?.IsAssignableFrom(x.GetType()) ?? true)
.ElementAtOrDefault(_ancestorLevel);
}
public static bool IsLogicalParentOf(this ILogical logical, ILogical target)
{
return(target.GetLogicalAncestors().Any(x => x == logical));
}