// do we no longer want a callback for when the closing sequence begins
public void RemoveClosingSequenceBeginCallback(ClosingSequenceBeginDelegate callback)
{
_onClosingSequenceBegin -= callback;
}
// do we want a callback for when the closing sequence begins
public void AddClosingSequenceBeginCallback(ClosingSequenceBeginDelegate callback)
{
RemoveClosingSequenceBeginCallback(callback); // avoid duplicate addition
_onClosingSequenceBegin += callback;
}
