/// <summary>
///
/// </summary>
public void Undo()
{
_undoServiceValidator.ValidateUndo();
var lastServiceIndex = _undoStack.Pop();
_isInternallySettingState = true;
try
{
_subUndoServices[lastServiceIndex].Undo();
}
catch
{
var resourceManager = new ResourceManager(typeof(StateManagement.Resources));
throw new InvalidOperationException(resourceManager.GetString("SubServiceUndoFailure"));
}
_isInternallySettingState = false;
_redoStack.Push(lastServiceIndex);
//Check if the next SubUndoService has become empty. If it has, then empty all undo stacks.
if (_undoStack.Count > 0)
{
var nextService = _undoStack.Peek();
if (!_subUndoServices[nextService].CanUndo)
{
ClearUndoStack();
}
}
}
/// <summary>
///
/// </summary>
public void Undo()
{
_undoServiceValidator.ValidateUndo();
//If tagging is used, the part of the state that will be changed by this will be tagged in _currentState (the change there will be undone).
var args = new StateSetEventArgs {
Tag = _currentState.Tag, SettingAction = StateSetAction.Undo
};
var memento = _undoStack.Pop();
SetState(memento.State);
_redoStack.Push(_currentState);
_currentState = memento;
StateSet?.Invoke(this, args);
}