public virtual void BeginUpdate()
{
IUpdateHandler handler = (IUpdateHandler)FindParent(typeof(IUpdateHandler));
if (handler != null)
{
handler.BeginUpdate();
}
}
/// <summary> Called to remove a child node. </summary>
/// <param name="value"> The node to be removed. </param>
/// <param name="index"> The nodes index. </param>
/// <remarks> Unlinks a node from it's owner. </remarks>
protected override void Removed(Node value, int index)
{
try
{
try
{
if (_node.Active)
{
IUpdateHandler handler = (IUpdateHandler)_node.FindParent(typeof(IUpdateHandler));
if (handler != null)
{
handler.BeginUpdate();
}
else
{
handler = null;
}
try
{
try
{
value.BeforeDeactivate();
}
finally
{
value.DeactivateAll();
}
}
finally
{
if (handler != null)
{
handler.EndUpdate(false);
}
}
}
}
finally
{
value._owner = null;
}
}
finally
{
_node.RemoveChild(value);
_node.ChildrenChanged();
base.Removed(value, index);
}
}
/// <summary> Called to add a node to the children. </summary>
/// <param name="value"> The node to be added. </param>
/// <param name="index"> The index of the node. </param>
/// <remarks> Also links the node to it's owner. </remarks>
protected override void Adding(Node value, int index)
{
value.Owner = null;
if (value.Active)
{
throw new ClientException(ClientException.Codes.CannotAddActiveChild);
}
base.Adding(value, index);
_node.AddChild(value);
try
{
value._owner = _node;
try
{
if (_node.Active)
{
IUpdateHandler handler = (IUpdateHandler)_node.FindParent(typeof(IUpdateHandler));
if (handler != null)
{
handler.BeginUpdate();
}
else
{
handler = null;
}
try
{
value.ActivateAll();
try
{
value.AfterActivate();
_node.ChildrenChanged();
}
catch
{
value.DeactivateAll();
throw;
}
}
finally
{
if (handler != null)
{
handler.EndUpdate(true);
}
}
}
}
catch
{
value._owner = null;
throw;
}
}
catch
{
_node.RemoveChild(value);
throw;
}
}