/// <summary>
/// Undoes the most recent action.
/// </summary>
public void UndoAction()
{
while (m_deltaHistory.Count > 0 && !m_deltaHistory.Peek().Valid)
{
m_deltaHistory.Pop();
}
if (m_deltaHistory.Count == 0 ||
(m_currentDelta != null && m_currentIsUndo) ||
!m_deltaHistory.Peek().CanUndo())
{
Dispatcher <Sfx> .Broadcast(AudioManager.kPlaySfx, Sfx.Invalid);
return;
}
Dispatcher <Sfx> .Broadcast(AudioManager.kPlaySfx, Sfx.Select);
m_currentIsUndo = true;
m_currentDelta = m_deltaHistory.Pop();
m_deltaFuture.Push(m_currentDelta);
m_currentDelta.UndoAction(this, OnDeltaDone);
}