/// <summary>
/// Adds a node to the collection</summary>
/// <remarks>Can't contain duplicates!</remarks>
/// <param name="item">The Node to add</param>
public void Add(Node item)
{
if (IsReadOnly)
{
throw new InvalidOperationException("collection is read only");
}
if (Contains(item))
{
return;
}
if (m_owner != null)
{
item.Parent = m_owner;
}
var ea = new CancelNodeEventArgs(item);
bool cancelled = NodeAdding.RaiseCancellable(this, ea);
if (cancelled)
{
return;
}
m_nodes.Add(item);
NodeAdded.Raise(this, new NodeEventArgs(item));
}
/// <summary>
/// Raises the NodeExpandedChanging event</summary>
/// <param name="e">Event args</param>
/// <returns>True iff the event was cancelled</returns>
protected virtual bool OnNodeExpandedChanging(CancelNodeEventArgs e)
{
return NodeExpandedChanging.RaiseCancellable(this, e);
}
