Updating TextToSpeechManager test scene

Author: keveleigh

Assets/HoloToolkit/Utilities/Tests/TextToSpeechManagerTest.cs

@@ -9,10 +9,13 @@ public class TextToSpeechManagerTest : MonoBehaviour
 {
     private GestureRecognizer gestureRecognizer;
     public TextToSpeechManager textToSpeechManager;
+    private bool isSpeaking;
 
     // Use this for initialization
     void Start ()
     {
+        isSpeaking = false;
+
         // Set up a GestureRecognizer to detect Select gestures.
         gestureRecognizer = new GestureRecognizer();
         gestureRecognizer.TappedEvent += GestureRecognizer_TappedEvent;
@@ -36,17 +39,24 @@ private void GestureRecognizer_TappedEvent(InteractionSourceKind source, int tap
 
             // If we have a text to speech manager on the target object, say something.
             // This voice will appear to emanate from the object.
-            if (tts != null)
+            if (tts != null && !isSpeaking)
             {
                 // Get the name
                 var voiceName = Enum.GetName(typeof(TextToSpeechVoice), tts.Voice);
 
                 // Create message
                 var msg = string.Format("This is the {0} voice. It should sound like it's coming from the object you clicked. Feel free to walk around and listen from different angles.", voiceName);
 
+                isSpeaking = true;
+
                 // Speak message
                 tts.SpeakText(msg);
             }
+            else if (isSpeaking)
+            {
+                isSpeaking = false;
+                tts.StopSpeaking();
+            }
         }
     }