private async Task changeStateAsync(ListeningState state)
{
if (listeningState != state)
{
System.Diagnostics.Debug.WriteLine($"Changing CommandInterpreter listening state to {state}");
if (state == ListeningState.Hypothesis)
{
preHypothesisListeningState = listeningState;
}
listeningState = state;
await listener.StopListeningAsync();
switch (state)
{
case ListeningState.Move:
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.MoveCommands, true);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.PieceConfirmation, false);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.YesNoCommands, false);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.CancelCommand, false);
break;
case ListeningState.PieceConfirmation:
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.PieceConfirmation, true);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.MoveCommands, false);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.YesNoCommands, false);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.CancelCommand, true);
break;
case ListeningState.Hypothesis:
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.YesNoCommands, true);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.MoveCommands, false);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.PieceConfirmation, false);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.CancelCommand, true);
break;
default:
throw new Exception("Tried to change CommandInterpreter state to an unknown listening state");
}
await listener.StartListeningAsync();
}
}