fix: disable TTS when no TTS engine is installed (fixes #36)

blockbasti · Mar 7, 2021 · 292ce69 · 292ce69
1 parent c18f17a
commit 292ce69
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Showing 2 changed files with 37 additions and 15 deletions.
diff --git a/lib/settings_page.dart b/lib/settings_page.dart
@@ -71,6 +71,7 @@ class _SettingsPageState extends State<SettingsPage> {
             'sound',
             desc: S.of(context).useTTSDesc,
             isDefault: true,
+            disabled: !TTSHelper.available,
             onSelect: () {
               TTSHelper.useTTS = true;
               SoundHelper.useSound = false;
@@ -91,9 +92,11 @@ class _SettingsPageState extends State<SettingsPage> {
             S.of(context).ttsLang,
             'tts_lang',
             desc: S.of(context).ttsLangDesc,
-            defaultVal: 'en-US',
+            defaultVal: (TTSHelper.languages.isNotEmpty
+                ? TTSHelper.languages.first
+                : ''),
             values: TTSHelper.languages,
-            //disabled: (!PrefService.getBool('tts_enable') ?? false),
+            disabled: !TTSHelper.available,
             onChange: (value) {
               TTSHelper.flutterTts.setLanguage(value);
             },
@@ -102,6 +105,7 @@ class _SettingsPageState extends State<SettingsPage> {
             S.of(context).announceUpcomingExercise,
             'tts_next_announce',
             desc: S.of(context).AnnounceUpcomingExerciseDesc,
+            disabled: !TTSHelper.available,
           ),
           PreferenceTitle(S.of(context).licenses),
           PreferenceText(

diff --git a/lib/tts_helper.dart b/lib/tts_helper.dart
@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter_tts/flutter_tts.dart';
 import 'package:preferences/preference_service.dart';
 
@@ -6,7 +8,9 @@ import 'package:preferences/preference_service.dart';
 class TTSHelper {
   static FlutterTts flutterTts;
 
-  static List<String> languages;
+  static List<String> languages = List.empty();
+
+  static bool available = true;
 
   /// enable/disable TTS output
   static bool useTTS = true;
@@ -15,18 +19,32 @@ class TTSHelper {
     flutterTts = FlutterTts();
 
     useTTS = PrefService.getString('sound') == 'tts' ?? true;
-    await flutterTts.setLanguage(PrefService.getString('tts_lang') ?? 'en-US');
-    await flutterTts.setSpeechRate(1.0);
-    await flutterTts.setVolume(1.0);
-    await flutterTts.setPitch(1.0);
-
-    languages = List<String>.from(await flutterTts.getLanguages);
-    languages.sort();
-    languages.remove('de-DE');
-    languages.remove('en-US');
-    languages.insertAll(0, ['en-US', 'de-DE']);
-    languages = await Future.wait(languages.map((e) async =>
-        '$e${await flutterTts.isLanguageInstalled(e) ? '' : '*'}'));
+
+    var ttsLang = PrefService.getString('tts_lang') ?? 'en-US';
+    if (ttsLang.endsWith('*')) ttsLang = ttsLang.replaceAll('*', '');
+    PrefService.setString('tts_lang', ttsLang);
+
+    try {
+      await flutterTts
+          .setLanguage(ttsLang)
+          .timeout(Duration(seconds: 1))
+          .then((_) async {
+        await flutterTts.setSpeechRate(1.0);
+        await flutterTts.setVolume(1.0);
+        await flutterTts.setPitch(1.0);
+
+        languages = List<String>.from(await flutterTts.getLanguages);
+        languages.sort();
+        languages.remove('de-DE');
+        languages.remove('en-US');
+        languages.insertAll(0, ['en-US', 'de-DE']);
+      });
+    } on TimeoutException {
+      available = false;
+      useTTS = false;
+      PrefService.setString('sound', 'beep');
+      return;
+    }
   }
 
   static void speak(String text) async {