Add settings to control sounds

lib/app_settings.dart

@@ -0,0 +1,38 @@
+/*
+ * Class for managing app-level configuration options
+ */
+
+import 'package:sembast/sembast.dart';
+import 'package:InvenTree/preferences.dart';
+
+class InvenTreeSettingsManager {
+
+  final store = StoreRef("settings");
+
+  Future<Database> get _db async => await InvenTreePreferencesDB.instance.database;
+
+  Future<dynamic> getValue(String key, dynamic backup) async {
+
+    final value = await store.record(key).get(await _db);
+
+    if (value == null) {
+      return backup;
+    }
+
+    return value;
+  }
+
+  Future<void> setValue(String key, dynamic value) async {
+
+    await store.record(key).put(await _db, value);
+  }
+
+  // Ensure we only ever create a single instance of this class
+  static final InvenTreeSettingsManager _manager = new InvenTreeSettingsManager._internal();
+
+  factory InvenTreeSettingsManager() {
+    return _manager;
+  }
+
+  InvenTreeSettingsManager._internal();
+}

lib/barcode.dart

@@ -1,3 +1,4 @@
+import 'package:InvenTree/app_settings.dart';
 import 'package:InvenTree/widget/dialogs.dart';
 import 'package:InvenTree/widget/snacks.dart';
 import 'package:audioplayers/audio_cache.dart';
@@ -39,14 +40,24 @@ class BarcodeHandler {
     QRViewController _controller;
     BuildContext _context;
 
-    void successTone() {
-      AudioCache player = AudioCache();
-      player.play("sounds/barcode_scan.mp3");
+    void successTone() async {
+
+      final bool en = await InvenTreeSettingsManager().getValue("barcodeSounds", true) as bool;
+
+      if (en) {
+        AudioCache player = AudioCache();
+        player.play("sounds/barcode_scan.mp3");
+      }
     }
 
-    void failureTone() {
-      AudioCache player = AudioCache();
-      player.play("sounds/barcode_error.mp3");
+    void failureTone() async {
+
+      final bool en = await InvenTreeSettingsManager().getValue("barcodeSounds", true) as bool;
+
+      if (en) {
+        AudioCache player = AudioCache();
+        player.play("sounds/barcode_error.mp3");
+      }
     }
 
     Future<void> onBarcodeMatched(Map<String, dynamic> data) {

lib/settings/app_settings.dart

@@ -5,6 +5,8 @@ import 'package:flutter/cupertino.dart';
 import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
 
+import 'package:InvenTree/app_settings.dart';
+
 class InvenTreeAppSettingsWidget extends StatefulWidget {
   @override
   _InvenTreeAppSettingsState createState() => _InvenTreeAppSettingsState();
@@ -15,10 +17,43 @@ class _InvenTreeAppSettingsState extends State<InvenTreeAppSettingsWidget> {
   final GlobalKey<_InvenTreeAppSettingsState> _settingsKey = GlobalKey<_InvenTreeAppSettingsState>();
 
   _InvenTreeAppSettingsState() {
-
   }
 
-  bool a = false;
+  bool barcodeSounds = true;
+  bool serverSounds = true;
+
+  @override
+  void initState() {
+    super.initState();
+
+    loadSettings();
+  }
+
+  void loadSettings() async {
+    barcodeSounds = await InvenTreeSettingsManager().getValue("barcodeSounds", true) as bool;
+    serverSounds = await InvenTreeSettingsManager().getValue("serverSounds", true) as bool;
+
+    setState(() {
+    });
+  }
+
+  void setBarcodeSounds(bool en) async {
+
+    await InvenTreeSettingsManager().setValue("barcodeSounds", en);
+    barcodeSounds = await InvenTreeSettingsManager().getValue("barcodeSounds", true);
+
+    setState(() {
+    });
+  }
+
+  void setServerSounds(bool en) async {
+
+    await InvenTreeSettingsManager().setValue("serverSounds", en);
+    serverSounds = await InvenTreeSettingsManager().getValue("serverSounds", true);
+
+    setState(() {
+    });
+  }
 
   @override
   Widget build(BuildContext context) {
@@ -33,35 +68,27 @@ class _InvenTreeAppSettingsState extends State<InvenTreeAppSettingsWidget> {
           children: [
             ListTile(
               title: Text(
-                "Sounds",
+                I18N.of(context).sounds,
                 style: TextStyle(fontWeight: FontWeight.bold),
               ),
               leading: FaIcon(FontAwesomeIcons.volumeUp),
             ),
             ListTile(
-              title: Text("Server Error"),
+              title: Text(I18N.of(context).serverError),
               subtitle: Text("Play audible tone on server error"),
               leading: FaIcon(FontAwesomeIcons.server),
               trailing: Switch(
-                value: false,
-                onChanged: (value) {
-                  setState(() {
-                    // TODO
-                  });
-                },
+                value: serverSounds,
+                onChanged: setServerSounds,
               ),
             ),
             ListTile(
-              title: Text("Barcode Tones"),
+              title: Text(I18N.of(context).barcodeTones),
               subtitle: Text("Play audible tones for barcode actions"),
               leading: FaIcon(FontAwesomeIcons.qrcode),
               trailing: Switch(
-                value: a,
-                onChanged: (value) {
-                  setState(() {
-                    a = value;
-                  });
-                },
+                value: barcodeSounds,
+                onChanged: setBarcodeSounds,
               ),
             ),
             Divider(height: 1),

lib/widget/dialogs.dart

@@ -1,4 +1,5 @@
 
+import 'package:InvenTree/app_settings.dart';
 import 'package:InvenTree/widget/snacks.dart';
 import 'package:audioplayers/audio_cache.dart';
 import 'package:audioplayers/audioplayers.dart';
@@ -116,8 +117,12 @@ Future<void> showServerError(String title, String description) async {
   }
 
   // Play a sound
-  AudioCache player = AudioCache();
-  player.play("sounds/server_error.mp3");
+  final bool tones = await InvenTreeSettingsManager().getValue("serverSounds", true) as bool;
+
+  if (tones) {
+    AudioCache player = AudioCache();
+    player.play("sounds/server_error.mp3");
+  }
 
   showSnackIcon(
     title,