private void RollbackEvent(BaseEvent @event, bool undoing)
{
ExecuteNoTrack(() => {
var reverse = @event.Rollback();
if (reverse == null) return;
if (reverse is BatchEvent)
{
if (!(@event is BatchEvent))
throw new InvalidOperationException("Must not return BatchEvent in Rollback()");
reverse = ProcessBatch((BatchEvent) reverse);
if (reverse == null) return;
}
(undoing ? _redoStack : _undoStack).Push(reverse);
});
}
private void PerformPostMarkAction(BaseEvent @event)
{
_redoStack.Clear();
NotifyChange(@event);
}
/// <summary>
/// Marks an event. This method also serves as an extensibility point for custom events.
/// </summary>
/// <param name="anEvent">The event to be marked.</param>
public void MarkEvent(BaseEvent anEvent)
{
if (!IsTrackingEnabled) return;
if (anEvent == null) throw new ArgumentNullException("anEvent");
(_currentBatch ?? _undoStack).Push(anEvent);
if (!IsInBatch) PerformPostMarkAction(anEvent);
}
private void NotifyChange(BaseEvent @event)
{
if (Changed != null) Changed(this, new MementorChangedEventArgs {Event = @event});
}
private void PerformPostMarkAction(BaseEvent @event)
{
_redoStack.Clear();
NotifyChange(@event);
}
