Topic GetSibling(Topic from, bool forward, int level, Vector4 vector)
{
if (this.Level == level && this.Vector == vector)
{
return(this);
}
if (forward)
{
if (HasChildren)
{
if (Children.Contains(from) && from != LastChild)
{
return(from.NextSibling.GetSibling(this, forward, level, vector));
}
else if (from == ParentTopic)
{
return(FirstChild.GetSibling(this, forward, level, vector));
}
}
}
else
{
if (HasChildren)
{
if (Children.Contains(from) && from != FirstChild)
{
return(from.PreviousSibling.GetSibling(this, forward, level, vector));
}
else if (from == ParentTopic)
{
return(LastChild.GetSibling(this, forward, level, vector));
}
}
}
if (ParentTopic == null)
{
return(null);
}
else
{
return(ParentTopic.GetSibling(this, forward, level, vector));
}
}
Topic GetFirstTopic(bool front, int level, Vector4 vector)
{
if (this.Level == level && Vector != vector)
{
return(this);
}
if (HasChildren)
{
if (front)
{
return(FirstChild.GetSibling(this, true, level, vector));
}
else
{
return(LastChild.GetSibling(this, false, level, vector));
}
}
else
{
return(null);
}
}