public void Handle <T>(DtmfTone tone, Func <DtmfTone, T> handleStart, Action <T, DtmfTone> handleEnd)
{
switch (currentState)
{
case State.NoDtmf:
if (tone != DtmfTone.None)
{
clientData = handleStart(tone);
currentState = State.Dtmf;
}
break;
case State.Dtmf:
if (tone == DtmfTone.None)
{
handleEnd((T)clientData, lastTone);
currentState = State.NoDtmf;
}
else if (tone != lastTone)
{
handleEnd((T)clientData, lastTone);
clientData = handleStart(tone);
}
break;
default:
throw new ArgumentOutOfRangeException();
}
lastTone = tone;
}
private static Tuple <int, int> KeyOf(DtmfTone t) => KeyOf(t.HighTone, t.LowTone);
