Add property indicating whether utterance callbacks are supported.

TTS.gd

@@ -7,6 +7,7 @@ var tts
 
 signal done
 
+
 func _init():
 	if OS.get_name() == "Server" or OS.has_feature("JavaScript"):
 		return
@@ -20,10 +21,10 @@ func _init():
 		print_debug("TTS not available!")
 
 
-
 func _ready():
 	pause_mode = Node.PAUSE_MODE_PROCESS
 
+
 func _get_min_rate():
 	if OS.has_feature('JavaScript'):
 		return 0.1
@@ -155,6 +156,20 @@ func get_is_rate_supported():
 var is_rate_supported setget , get_is_rate_supported
 
 
+func _get_are_utterance_callbacks_supported():
+	if Engine.has_singleton("GodotTTS"):
+		return false
+	elif OS.has_feature('JavaScript'):
+		return false
+	elif tts != null:
+		return tts.are_utterance_callbacks_supported()
+	else:
+		return false
+
+
+var are_utterance_callbacks_supported setget , _get_are_utterance_callbacks_supported
+
+
 func _get_can_detect_is_speaking():
 	if Engine.has_singleton("GodotTTS"):
 		return true

src/lib.rs

@@ -165,6 +165,15 @@ impl TTS {
         rate_supported
     }
 
+    #[export]
+    fn are_utterance_callbacks_supported(&mut self, _owner: &Node) -> bool {
+        let Features {
+            utterance_callbacks: supported,
+            ..
+        } = self.0.supported_features();
+        supported
+    }
+
     #[export]
     fn _process(&mut self, owner: &Node, _delta: f32) {
         if let Some(msg) = self.1.try_recv().ok() {