// If multiple nodes are selected and the method does not have the AllowMultiSelectionAttribute
// attribute, disable the command.
protected override void CommandUpdate(object target, CommandArrayInfo cinfo)
{
NodeCommandHandler nc = (NodeCommandHandler)target;
base.CommandUpdate(target, cinfo);
if (nc.MultipleSelectedNodes)
{
bool allowMultiArray = false;
ICommandArrayUpdateHandler h = ((ICommandArrayUpdateHandler)this).Next;
while (h != null)
{
if (h is AllowMultiSelectionAttribute)
{
allowMultiArray = true;
break;
}
h = h.Next;
}
if (!allowMultiArray)
{
cinfo.Clear();
}
}
}
public void AddCustomHandlers (ICommandUpdateHandler handlerChain, ICommandArrayUpdateHandler arrayHandlerChain)
{
this.customHandlerChain = handlerChain;
this.customArrayHandlerChain = arrayHandlerChain;
}
ICommandArrayUpdateHandler ChainHandler (ICommandArrayUpdateHandler chain, object attr)
{
ICommandArrayUpdateHandler h = attr as ICommandArrayUpdateHandler;
if (h == null) return chain;
h.Next = chain ?? DefaultCommandHandler.Instance;
return h;
}
