Update notifications periodically (#311)

- Call periodically from API class

lib/api.dart

@@ -5,26 +5,25 @@ import "dart:io";
 import "package:flutter/foundation.dart";
 import "package:http/http.dart" as http;
 import "package:intl/intl.dart";
-import "package:inventree/app_colors.dart";
-import "package:inventree/inventree/status_codes.dart";
-import "package:inventree/preferences.dart";
-
 import "package:open_filex/open_filex.dart";
 import "package:cached_network_image/cached_network_image.dart";
 import "package:flutter/material.dart";
 import "package:font_awesome_flutter/font_awesome_flutter.dart";
 import "package:flutter_cache_manager/flutter_cache_manager.dart";
-
-import "package:inventree/widget/dialogs.dart";
-import "package:inventree/l10.dart";
-import "package:inventree/helpers.dart";
-import "package:inventree/inventree/sentry.dart";
-import "package:inventree/inventree/model.dart";
-import "package:inventree/user_profile.dart";
-import "package:inventree/widget/snacks.dart";
 import "package:path_provider/path_provider.dart";
 
 import "package:inventree/api_form.dart";
+import "package:inventree/app_colors.dart";
+import "package:inventree/preferences.dart";
+import "package:inventree/l10.dart";
+import "package:inventree/helpers.dart";
+import "package:inventree/inventree/model.dart";
+import "package:inventree/inventree/notification.dart";
+import "package:inventree/inventree/status_codes.dart";
+import "package:inventree/inventree/sentry.dart";
+import "package:inventree/user_profile.dart";
+import "package:inventree/widget/dialogs.dart";
+import "package:inventree/widget/snacks.dart";
 
 
 /*
@@ -520,6 +519,16 @@ class InvenTreeAPI {
     }
 
     // Ok, probably pretty good...
+
+    if (_notification_timer == null) {
+      debug("starting notification timer");
+      _notification_timer = Timer.periodic(
+        Duration(seconds: 5),
+        (timer) {
+            _refreshNotifications();
+        });
+    }
+
     return true;
 
   }
@@ -1461,4 +1470,24 @@ class InvenTreeAPI {
   InvenTreeStatusCode get StockStatus => _get_status_class("stock/status/");
   InvenTreeStatusCode get PurchaseOrderStatus => _get_status_class("order/po/status/");
 
+  int notification_counter = 0;
+
+  Timer? _notification_timer;
+
+  /*
+   * Update notification counter (called periodically)
+   */
+  Future<void> _refreshNotifications() async {
+    if (!isConnected()) {
+      return;
+    }
+
+    if (!supportsNotifications) {
+      return;
+    }
+
+    InvenTreeNotification().count(filters: {"read": "false"}).then((int n) {
+      notification_counter = n;
+    });
+  }
 }

lib/widget/drawer.dart

@@ -129,9 +129,12 @@ class InvenTreeDrawer extends StatelessWidget {
     }
 
     if (InvenTreeAPI().supportsNotifications) {
+      int notification_count = InvenTreeAPI().notification_counter;
+
       tiles.add(
         ListTile(
           leading: FaIcon(FontAwesomeIcons.bell),
+          trailing: notification_count > 0 ? Text(notification_count.toString()) : null,
           title: Text(L10().notifications),
           onTap: _notifications,
         )

lib/widget/home.dart

@@ -42,16 +42,6 @@ class _InvenTreeHomePageState extends State<InvenTreeHomePage> with BaseWidgetPr
     // Initially load the profile and attempt server connection
     _loadProfile();
 
-    _refreshNotifications();
-
-    // Refresh notifications every ~30 seconds
-    Timer.periodic(
-        Duration(
-          milliseconds: 30000,
-        ), (timer) {
-      _refreshNotifications();
-    });
-
     InvenTreeAPI().registerCallback(() {
 
       if (mounted) {
@@ -180,28 +170,6 @@ class _InvenTreeHomePageState extends State<InvenTreeHomePage> with BaseWidgetPr
     setState(() {});
   }
 
-  /*
-   * Refresh the number of active notifications for this user
-   */
-  Future<void> _refreshNotifications() async {
-
-    if (!InvenTreeAPI().isConnected()) {
-      return;
-    }
-
-    // Ignore if the widget is no longer active
-    if (!mounted) {
-      return;
-    }
-
-    // final notifications = await InvenTreeNotification().list();
-
-    setState(() {
-      // _notificationCounter = notifications.length;
-    });
-  }
-
-
   Widget _listTile(BuildContext context, String label, IconData icon, {Function()? callback, String role = "", String permission = "", Widget? trailing}) {
 
     bool connected = InvenTreeAPI().isConnected();