Merge pull request microsoft#338 from keveleigh/master

Adding StopSpeaking() to TextToSpeechManager

Assets/HoloToolkit/Utilities/Scripts/TextToSpeechManager.cs

@@ -382,6 +382,33 @@ public void SpeakText(string text)
             #endif
         }
 
+        /// <summary>
+        /// Returns whether or not the AudioSource is actively playing.
+        /// </summary>
+        /// <returns>
+        /// True, if the AudioSource is playing. False, if the AudioSource is not playing or is null.
+        /// </returns>
+        public bool IsSpeaking()
+        {
+            if (audioSource != null)
+            {
+                return audioSource.isPlaying;
+            }
+
+            return false;
+        }
+
+        /// <summary>
+        /// Stops text-to-speech playback.
+        /// </summary>
+        public void StopSpeaking()
+        {
+            if (IsSpeaking())
+            {
+                audioSource.Stop();
+            }
+        }
+
         /// <summary>
         /// Gets or sets the audio source where speech will be played.
         /// </summary>

Assets/HoloToolkit/Utilities/Tests/TextToSpeechManagerTest.cs

@@ -36,7 +36,7 @@ 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 && !tts.IsSpeaking())
             {
                 // Get the name
                 var voiceName = Enum.GetName(typeof(TextToSpeechVoice), tts.Voice);
@@ -47,6 +47,10 @@ private void GestureRecognizer_TappedEvent(InteractionSourceKind source, int tap
                 // Speak message
                 tts.SpeakText(msg);
             }
+            else if (tts.IsSpeaking())
+            {
+                tts.StopSpeaking();
+            }
         }
     }