/// <summary>Append a undo item to the current transaction.</summary>
/// <param name="item">Undo item.</param>
public void Append(IPpsUndoItem item)
{
if (InUndoRedoOperation)
{
return;
}
if (currentUndoTransaction == null)
{
throw new InvalidOperationException("There is no active transaction.");
}
currentUndoTransaction.Append(item); // append new item to current undo transaction
} // proc Append
} // ctor
public override void Append(IPpsUndoItem item)
=> items.Add(item);
} // ctor
public override void Append(IPpsUndoItem item)
=> parent.Append(item);
} // proc CheckBlockingTransaction
public abstract void Append(IPpsUndoItem item);
