Various improvements.

* Add ability to detect when speaking. Doesn't yet work under Linux or WinRT.
* Add signal to indicate when speaking is done.
* Refine screen reader detection under Android.

TTS.gd

@@ -5,6 +5,8 @@ var TTS
 
 var tts
 
+signal done
+
 
 func _ready():
 	if OS.get_name() == "Server" or OS.has_feature("JavaScript"):
@@ -150,6 +152,32 @@ func get_is_rate_supported():
 var is_rate_supported setget , get_is_rate_supported
 
 
+func _get_can_detect_is_speaking():
+	if Engine.has_singleton("AndroidTTS"):
+		return true
+	elif OS.has_feature('JavaScript'):
+		return true
+	elif tts != null:
+		return tts.can_detect_is_speaking
+	return false
+
+
+var can_detect_is_speaking setget , _get_can_detect_is_speaking
+
+
+func _get_is_speaking():
+	if Engine.has_singleton("AndroidTTS"):
+		return tts.is_speaking()
+	elif OS.has_feature('JavaScript'):
+		return JavaScript.eval("window.speechSynthesis.speaking")
+	elif tts != null:
+		return tts.is_speaking
+	return false
+
+
+var is_speaking setget , _get_is_speaking
+
+
 func _get_can_detect_screen_reader():
 	if Engine.has_singleton("AndroidTTS"):
 		return true
@@ -183,6 +211,19 @@ func singular_or_plural(count, singular, plural):
 		return plural
 
 
+var _was_speaking = false
+
+
+func _process(delta):
+	if self.is_speaking:
+		print("xxx Speaking")
+		_was_speaking = true
+	elif _was_speaking:
+		print("xxx Done")
+		emit_signal("done")
+		_was_speaking = false
+
+
 func _exit_tree():
 	if not tts or not TTS:
 		return

android/src/games/lightsout/godot/tts/TTS.java

@@ -2,18 +2,14 @@ package games.lightsout.godot.tts;
 
 import java.util.List;
 
+import org.godotengine.godot.Godot;
+
 import android.accessibilityservice.AccessibilityServiceInfo;
 import android.app.Activity;
-import android.content.Intent;
 import android.content.Context;
 import android.speech.tts.TextToSpeech;
-import android.util.Log;
 import android.view.accessibility.AccessibilityManager;
 
-import com.godot.game.R;
-import javax.microedition.khronos.opengles.GL10;
-import org.godotengine.godot.Godot;
-
 public class TTS extends Godot.SingletonBase implements TextToSpeech.OnInitListener {
 
     protected Activity appActivity;
@@ -48,15 +44,21 @@ public class TTS extends Godot.SingletonBase implements TextToSpeech.OnInitListe
         tts.setSpeechRate(rate);
     }
 
+    public boolean is_speaking() {
+        return tts.isSpeaking();
+    }
+
     public boolean has_screen_reader() {
         AccessibilityManager accessibilityManager = (AccessibilityManager) appContext
                 .getSystemService(Context.ACCESSIBILITY_SERVICE);
         if (accessibilityManager != null) {
-            List<AccessibilityServiceInfo> screenReaders =accessibilityManager.getEnabledAccessibilityServiceList(AccessibilityServiceInfo.FEEDBACK_SPOKEN);
+            List<AccessibilityServiceInfo> screenReaders = accessibilityManager
+                    .getEnabledAccessibilityServiceList(AccessibilityServiceInfo.FEEDBACK_SPOKEN);
             return screenReaders.size() != 0;
-        } else
+        } else {
             return false;
         }
+    }
 
     public void getInstanceId(int pInstanceId) {
         // You will need to call this method from Godot and pass in the
@@ -74,7 +76,8 @@ public class TTS extends Godot.SingletonBase implements TextToSpeech.OnInitListe
         this.appContext = appActivity.getApplicationContext();
         this.tts = new TextToSpeech(this.appContext, this);
         // Register class name and functions to bind.
-        registerClass("AndroidTTS", new String[] { "speak", "stop", "get_rate", "set_rate", "getInstanceId" });
+        registerClass("AndroidTTS", new String[] { "speak", "stop", "get_rate", "set_rate", "has_screen_reader",
+                "is_speaking", "getInstanceId" });
         this.activity.runOnUiThread(new Runnable() {
             public void run() {
             }

src/lib.rs

@@ -93,11 +93,35 @@ impl TTS {
                 #[cfg(windows)]
                 {
                     let tolk = tolk::Tolk::new();
-                    return tolk.detect_screen_reader().is_some()
+                    return tolk.detect_screen_reader().is_some();
                 }
                 return false;
             })
             .done();
+        builder
+            .add_property("can_detect_is_speaking")
+            .with_getter(|this: &TTS, _| {
+                let Features {
+                    is_speaking: is_speaking_supported,
+                    ..
+                } = this.0.supported_features();
+                return is_speaking_supported;
+            })
+            .done();
+        builder
+            .add_property("is_speaking")
+            .with_getter(|this: &TTS, _| {
+                let Features {
+                    is_speaking: is_speaking_supported,
+                    ..
+                } = this.0.supported_features();
+                if is_speaking_supported {
+                    return this.0.is_speaking().unwrap();
+                } else {
+                    return false;
+                }
+            })
+            .done();
     }
 
     #[export]