/// <summary>
/// 撤销操作
/// </summary>
/// <returns></returns>
public OperationStack Undo()
{
IsRecording = false;
var stack = UndoStack.Pop();
Undoing?.Invoke(stack.Item1, stack.Item2);
RedoStack.Push(stack);
Undone?.Invoke(stack.Item1, stack.Item2);
IsRecording = true;
return(stack.Item1);
}
/// <summary>
/// Called when before undoing.
/// </summary>
/// <param name="undoUnit">The undo unit.</param>
public virtual void OnUndoing(IUndoUnit undoUnit)
{
Undoing?.Invoke(this, undoUnit);
}