/// <summary>
/// Replaces the child node oldChild with newChild node.
/// </summary>
/// <param name="newChild">The new node to put in the child list.</param>
/// <param name="oldChild">The node being replaced in the list.</param>
/// <returns>The node replaced.</returns>
public HtmlNode ReplaceChild(HtmlNode newChild, HtmlNode oldChild)
{
if (newChild == null)
{
return RemoveChild(oldChild);
}
if (oldChild == null)
{
return AppendChild(newChild);
}
int index = -1;
if (_childnodes != null)
{
index = _childnodes[oldChild];
}
if (index == -1)
{
throw new ArgumentException(HtmlDocument.HtmlExceptionRefNotChild);
}
if (_childnodes != null) _childnodes.Replace(index, newChild);
_ownerdocument.SetIdForNode(null, oldChild.GetId());
_ownerdocument.SetIdForNode(newChild, newChild.GetId());
_outerchanged = true;
_innerchanged = true;
return newChild;
}
/// <summary>
/// Adds the specified node to the end of the list of children of this node.
/// </summary>
/// <param name="newChild">The node to add. May not be null.</param>
/// <returns>The node added.</returns>
public HtmlNode AppendChild(HtmlNode newChild)
{
if (newChild == null)
{
throw new ArgumentNullException("newChild");
}
ChildNodes.Append(newChild);
_ownerdocument.SetIdForNode(newChild, newChild.GetId());
_outerchanged = true;
_innerchanged = true;
return newChild;
}
/// <summary>
/// Inserts the specified node immediately before the specified reference node.
/// </summary>
/// <param name="newChild">The node to insert. May not be <c>null</c>.</param>
/// <param name="refChild">The node that is the reference node. The newChild is placed before this node.</param>
/// <returns>The node being inserted.</returns>
public HtmlNode InsertBefore(HtmlNode newChild, HtmlNode refChild)
{
if (newChild == null)
{
throw new ArgumentNullException("newChild");
}
if (refChild == null)
{
return AppendChild(newChild);
}
if (newChild == refChild)
{
return newChild;
}
int index = -1;
if (_childnodes != null)
{
index = _childnodes[refChild];
}
if (index == -1)
{
throw new ArgumentException(HtmlDocument.HtmlExceptionRefNotChild);
}
if (_childnodes != null) _childnodes.Insert(index, newChild);
_ownerdocument.SetIdForNode(newChild, newChild.GetId());
_outerchanged = true;
_innerchanged = true;
return newChild;
}
