private async void MediaElement_CurrentStateChanged(object sender, RoutedEventArgs e)
{
if (this.MediaElement.CurrentState == MediaElementState.Paused ||
this.MediaElement.CurrentState == MediaElementState.Stopped ||
this.MediaElement.CurrentState == MediaElementState.Closed)
{
this.state = SpeechDialogBoxState.Default;
await this.SetState(SpeechDialogBoxState.Default);
this.MediaElement.CurrentStateChanged -= this.MediaElement_CurrentStateChanged;
}
}
/// <summary>
/// Speaks the specified SSML in the current voice.
/// </summary>
/// <remarks>The SSML may override the current voice.</remarks>
public async Task SpeakSsml(string text)
{
this.state = SpeechDialogBoxState.Speaking;
var synthesizer = new SpeechSynthesizer();
await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, new DispatchedHandler(
() =>
{
synthesizer.Voice = this.FindVoice();
}));
var stream = synthesizer.SynthesizeSsmlToStreamAsync(text);
stream.Completed += SpeechSynthesis_Completed;
}
/// <summary>
/// Move to a new state.
/// </summary>
private async Task SetState(SpeechDialogBoxState state)
{
// Do not interrupt while speaking.
while (this.state == SpeechDialogBoxState.Speaking)
{
await Task.Delay(200);
}
this.state = state;
await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, new DispatchedHandler(
async () =>
{
// Hide all.
this.DefaultState.Visibility = Visibility.Collapsed;
this.TypingState.Visibility = Visibility.Collapsed;
this.ListeningState.Visibility = Visibility.Collapsed;
this.ThinkingState.Visibility = Visibility.Collapsed;
switch (this.state)
{
case SpeechDialogBoxState.Default:
this.DefaultState.Visibility = Visibility.Visible;
break;
case SpeechDialogBoxState.Typing:
this.TypingState.Visibility = Visibility.Visible;
break;
case SpeechDialogBoxState.Listening:
this.ListeningState.Visibility = Visibility.Visible;
this.MediaElement.Source = new Uri("ms-appx:///Assets//Listening.wav");
SpeechRecognizer recognizer = new SpeechRecognizer();
foreach (var constraint in this.Constraints)
{
recognizer.Constraints.Add(constraint);
}
await recognizer.CompileConstraintsAsync();
var reco = recognizer.RecognizeAsync();
reco.Completed += this.SpeechRecognition_Completed;
break;
case SpeechDialogBoxState.Thinking:
this.ThinkingState.Visibility = Visibility.Visible;
break;
default:
break;
}
}));
}
/// <summary>
/// Speaks the current text in the current voice and with the current ResponseTemplate.
/// </summary>
public async Task Speak()
{
this.state = SpeechDialogBoxState.Speaking;
string currentText = string.Empty;
var synthesizer = new SpeechSynthesizer();
await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, new DispatchedHandler(
() =>
{
synthesizer.Voice = this.FindVoice();
currentText = string.Format(this.ResponsePattern, this.Text);
}));
var stream = synthesizer.SynthesizeTextToStreamAsync(currentText);
stream.Completed += SpeechSynthesis_Completed;
}
