/// <summary>
/// Add a child
/// </summary>
/// <param name="child">Node to add as a child</param>
public void AddChild(Node child)
{
if (child == null) throw new ArgumentNullException("child");
if (child._parentNode != null)
{
if (child._parentNode != this) throw new ArgumentException("", "child");
return;
}
Childrens.Add(child);
child.SetParent(this);
}
/// <summary>
/// Sets the parent of this node
/// </summary>
/// <param name="parent">Parent node</param>
private void SetParent(Node parent)
{
bool changed = (parent != _parentNode);
_parentNode = parent;
ParentTransform = parent;
if (!changed) return;
if (_parentNode != null) _depth = _parentNode._depth + 1;
else _depth = 0;
for(int i = 0; i < Childrens.Count; i++) Childrens[i].UpdateDepthLevel();
}
/// <summary>
/// Receives a request for updating a specific child
/// </summary>
/// <param name="child">Child node to update</param>
protected virtual void RequestUpdate(Node child)
{
ChildldrensToUpdate.Add(child);
if ((ParentTransform == null) || _parentAskedForUpdate) return;
_parentNode.RequestUpdate(this);
_parentAskedForUpdate = true;
}
/// <summary> /// Performs internal operation when a child node is about to be destroyed. /// Used when this class is inherited /// </summary> /// <param name="child">Child to destroy</param> protected abstract void DestroyChildIntern(Node child);
/// <summary>
/// Remove a child
/// </summary>
/// <param name="child">Child to remove</param>
/// <returns></returns>
public bool RemoveChild(Node child)
{
if(child._parentNode != this) throw new ArgumentException("", "child");
Childrens.Remove(child);
child.SetParent(null);
return true;
}
/// <summary>
/// Destroys a child node
/// </summary>
/// <param name="child">Child to destroy</param>
public void DestroyChild(Node child)
{
if (child._parentNode != this) throw new ArgumentException("", "child");
child.DestroyAllChild();
RemoveChild(child);
DestroyChildIntern(child);
}
/// <summary>
/// Destroys a child node
/// </summary>
/// <param name="child">Child to destroy</param>
protected override void DestroyChildIntern(Node child)
{
SceneNode node = child as SceneNode;
if(node == null)
throw new InvalidCastException("Must be a SceneNode instance");
node.Owner.DestroyNode(node);
}
