public void RemoveChild(TreeNodeBase child)
{
NodeEventArgs eventArgs = new NodeEventArgs(child);
this.OnChildRemoving(eventArgs);
if (eventArgs.Cancel)
{
return;
}
this.children.Remove(child);
}
private void ChildAdding(object sender, NodeEventArgs e)
{
if (e.Node.Children.Count > 0)
{
throw new InvalidOperationException("You can only add nodes that don't have children");
// Alternatively, you could recursively get the children, set up the added/removed events and add to the index
}
e.Node.ChildAdding += new EventHandler <NodeEventArgs>(ChildAdding);
e.Node.ChildRemoving += new EventHandler <NodeEventArgs>(ChildRemoving);
Index.Add(this.GetNodeIndex(e.Node), e.Node);
}
private void ChildRemoving(object sender, NodeEventArgs e)
{
if (e.Node.Children.Count > 0)
{
throw new InvalidOperationException("You can only remove leaf nodes that don't have children");
// Alternatively, you could recursively get the children, remove the events and remove from the index
}
// Remove from the index. Remove events in case user code keeps reference to this node and later adds/removes children
e.Node.ChildAdding -= new EventHandler <NodeEventArgs>(ChildAdding);
e.Node.ChildRemoving -= new EventHandler <NodeEventArgs>(ChildRemoving);
Index.Remove(this.GetNodeIndex(e.Node));
}
/// <summary>
/// Adds a child node to the current node
/// </summary>
/// <param name="child">The child to add.</param>
/// <returns>The child node, if it was added. Useful for chaining methods.</returns>
public TreeNodeBase AddChild(TreeNodeBase child)
{
NodeEventArgs eventArgs = new NodeEventArgs(child);
this.OnChildAdding(eventArgs);
if (eventArgs.Cancel)
{
return(null);
}
this.children.Add(child);
return(child);
}
