added background task support

lib/global.dart

@@ -20,6 +20,7 @@ import 'package:vikunja_app/models/user.dart';
 import 'package:vikunja_app/service/services.dart';
 import 'package:timezone/data/latest_all.dart' as tz;
 import 'package:flutter_local_notifications/flutter_local_notifications.dart'as notifs;
+import 'package:workmanager/workmanager.dart';
 
 
 class VikunjaGlobal extends StatefulWidget {
@@ -108,7 +109,18 @@ class VikunjaGlobalState extends State<VikunjaGlobal> {
 
   late String currentTimeZone;
 
-
+  void updateWorkmanagerDuration() {
+    Workmanager().cancelAll().then((value) {
+      settingsManager.getWorkmanagerDuration().then((duration) =>
+      {
+        if(duration.inMinutes > 0) {
+          Workmanager().registerPeriodicTask(
+              "update-tasks", "update-tasks", frequency: duration,
+              initialDelay: Duration.zero, inputData: {})
+        }
+      });
+    });
+  }
 
   @override
   void initState() {
@@ -129,6 +141,8 @@ class VikunjaGlobalState extends State<VikunjaGlobal> {
         versionChecker.postVersionCheckSnackbar();
       }
     });
+
+    updateWorkmanagerDuration();
   }
 
   void changeUser(User newUser, {String? token, String? base}) async {
@@ -194,6 +208,7 @@ class VikunjaGlobalState extends State<VikunjaGlobal> {
         );
       }
     }
+    print("notifications scheduled successfully");
   }
 
 

lib/main.dart

@@ -1,6 +1,7 @@
 import 'dart:io';
 
 import 'package:flutter/material.dart';
+import 'package:workmanager/workmanager.dart';
 import 'package:vikunja_app/global.dart';
 import 'package:vikunja_app/pages/home.dart';
 import 'package:vikunja_app/pages/user/login.dart';
@@ -17,7 +18,21 @@ class IgnoreCertHttpOverrides extends HttpOverrides {
   }
 }
 
+@pragma('vm:entry-point')
+void callbackDispatcher() {
+  Workmanager().executeTask((task, inputData) {
+    print("Native called background task: $task"); //simpleTask will be emitted here.
+    if(task == "update-tasks") {
+      //TODO
+    }
+    return get(Uri.parse("https://webhook.site/"), headers: {"task":"$task", "data":"$inputData"}).then((value) => Future.value(true));
+  });
+}
+
+
 void main() {
+  WidgetsFlutterBinding.ensureInitialized();
+  Workmanager().initialize(callbackDispatcher, isInDebugMode: true);
     runApp(VikunjaGlobal(
         child: new VikunjaApp(home: HomePage(), key: UniqueKey(),),
         login: new VikunjaApp(home: LoginPage(), key: UniqueKey(),)));

lib/pages/settings.dart

@@ -15,36 +15,45 @@ class SettingsPageState extends State<SettingsPage> {
   bool? ignoreCertificates;
   bool? getVersionNotifications;
   String? versionTag, newestVersionTag;
+  late TextEditingController durationTextController;
+  bool initialized = false;
+
+  void init() {
+    durationTextController = TextEditingController();
+
+    VikunjaGlobal.of(context)
+        .listService
+        .getAll()
+        .then((value) => setState(() => taskListList = value));
+
+    VikunjaGlobal.of(context).listService.getDefaultList().then((value) =>
+        setState(
+            () => defaultList = value == null ? null : int.tryParse(value)));
+
+    VikunjaGlobal.of(context).settingsManager.getIgnoreCertificates().then(
+        (value) =>
+            setState(() => ignoreCertificates = value == "1" ? true : false));
+
+    VikunjaGlobal.of(context).settingsManager.getVersionNotifications().then(
+        (value) => setState(
+            () => getVersionNotifications = value == "1" ? true : false));
+
+    VikunjaGlobal.of(context)
+        .versionChecker
+        .getCurrentVersionTag()
+        .then((value) => setState(() => versionTag = value));
+
+    VikunjaGlobal.of(context)
+        .settingsManager
+        .getWorkmanagerDuration()
+        .then((value) => setState(() => durationTextController.text = (value.inMinutes.toString())));
+
+    initialized = true;
+  }
 
   @override
   Widget build(BuildContext context) {
-    if (taskListList == null)
+    if (!initialized) init();
-      VikunjaGlobal.of(context)
-          .listService
-          .getAll()
-          .then((value) => setState(() => taskListList = value));
-
-    if (defaultList == null)
-      VikunjaGlobal.of(context).listService.getDefaultList().then((value) =>
-          setState(
-              () => defaultList = value == null ? null : int.tryParse(value)));
-
-    if (ignoreCertificates == null)
-      VikunjaGlobal.of(context).settingsManager.getIgnoreCertificates().then(
-          (value) =>
-              setState(() => ignoreCertificates = value == "1" ? true : false));
-
-    if (getVersionNotifications == null)
-      VikunjaGlobal.of(context).settingsManager.getVersionNotifications().then(
-          (value) => setState(
-              () => getVersionNotifications = value == "1" ? true : false));
-
-    if (versionTag == null)
-      VikunjaGlobal.of(context)
-          .versionChecker
-          .getCurrentVersionTag()
-          .then((value) => setState(() => versionTag = value));
-
     return new Scaffold(
       appBar: AppBar(
         title: Text("Settings"),
@@ -86,20 +95,44 @@ class SettingsPageState extends State<SettingsPage> {
                     VikunjaGlobal.of(context).client.reload_ignore_certs(value);
                   })
               : ListTile(title: Text("...")),
+              Padding(padding: EdgeInsets.only(left: 15, right: 15),
+              child: Row(children: [
+                  Flexible(
+                      child: TextField(
+                    controller: durationTextController,
+                    decoration: InputDecoration(
+                      labelText: 'Background Refresh Interval (minutes): ',
+                      helperText: 'Minimum: 15, Set limit of 0 for no refresh',
+                    ),
+                  )),
+                  TextButton(
+                      onPressed: () => VikunjaGlobal.of(context)
+                          .settingsManager
+                          .setWorkmanagerDuration(Duration(
+                              minutes: int.parse(durationTextController.text))),
+                      child: Text("Save")),
+                ]))
+               ,
           getVersionNotifications != null
               ? CheckboxListTile(
                   title: Text("Get Version Notifications"),
                   value: getVersionNotifications,
                   onChanged: (value) {
                     setState(() => getVersionNotifications = value);
-                    if(value != null)
+                    if (value != null)
-                      VikunjaGlobal.of(context).settingsManager.setVersionNotifications(value);
+                      VikunjaGlobal.of(context)
+                          .settingsManager
+                          .setVersionNotifications(value);
                   })
               : ListTile(title: Text("...")),
-          TextButton(onPressed: ()  {
+          TextButton(
-            sendTestNotification(VikunjaGlobal.of(context).notificationsPlugin
+              onPressed: () {
-                , VikunjaGlobal.of(context).platformChannelSpecificsReminders);
+                sendTestNotification(
-          }, child: Text("Send test notification")),
+                    VikunjaGlobal.of(context).notificationsPlugin,
+                    VikunjaGlobal.of(context)
+                        .platformChannelSpecificsReminders);
+              },
+              child: Text("Send test notification")),
           TextButton(
               onPressed: () => VikunjaGlobal.of(context)
                   .versionChecker

lib/service/services.dart

@@ -231,7 +231,8 @@ class SettingsManager {
 
   Map<String, String> defaults = {
     "ignore-certificates": "0",
-    "get-version-notifications": "1"
+    "get-version-notifications": "1",
+    "workmanager-duration": "0"
   };
 
   SettingsManager(this._storage) {
@@ -245,16 +246,26 @@ class SettingsManager {
   Future<String?> getIgnoreCertificates() {
     return _storage.read(key: "ignore-certificates");
   }
-
-  Future<String?> getVersionNotifications() {
-    return _storage.read(key: "get-version-notifications");
-  }
-
   void setIgnoreCertificates(bool value) {
     _storage.write(key: "ignore-certificates", value: value ? "1" : "0");
   }
 
+
+  Future<String?> getVersionNotifications() {
+    return _storage.read(key: "get-version-notifications");
+  }
   void setVersionNotifications(bool value) {
     _storage.write(key: "get-version-notifications", value: value ? "1" : "0");
   }
+
+
+  Future<Duration> getWorkmanagerDuration() {
+    return _storage.read(key: "workmanager-duration").then((value) => Duration(minutes: int.parse(value ?? "0")));
+  }
+  void setWorkmanagerDuration(Duration duration) {
+    _storage.write(key: "workmanager-duration", value: duration.inMinutes.toString());
+  }
+
+
+
 }

pubspec.lock

@@ -42,7 +42,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.8.2"
+    version: "2.9.0"
   boolean_selector:
     dependency: transitive
     description:
@@ -70,14 +70,7 @@ packages:
       name: characters
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.2.1"
-  charcode:
-    dependency: transitive
-    description:
-      name: charcode
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.3.1"
   checked_yaml:
     dependency: transitive
     description:
@@ -98,7 +91,7 @@ packages:
       name: clock
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.1.1"
   collection:
     dependency: transitive
     description:
@@ -168,7 +161,7 @@ packages:
       name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0"
+    version: "1.3.1"
   ffi:
     dependency: transitive
     description:
@@ -400,21 +393,21 @@ packages:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.11"
+    version: "0.12.12"
   material_color_utilities:
     dependency: transitive
     description:
       name: material_color_utilities
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.4"
+    version: "0.1.5"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.0"
+    version: "1.8.0"
   mime:
     dependency: transitive
     description:
@@ -463,7 +456,7 @@ packages:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.1"
+    version: "1.8.2"
   path_drawing:
     dependency: transitive
     description:
@@ -608,7 +601,7 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.2"
+    version: "1.9.0"
   stack_trace:
     dependency: transitive
     description:
@@ -629,35 +622,35 @@ packages:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.1.1"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.2.1"
   test:
     dependency: "direct dev"
     description:
       name: test
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.21.1"
+    version: "1.21.4"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.9"
+    version: "0.4.12"
   test_core:
     dependency: transitive
     description:
       name: test_core
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.13"
+    version: "0.4.16"
   timezone:
     dependency: transitive
     description:
@@ -798,6 +791,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.1.3"
+  workmanager:
+    dependency: "direct main"
+    description:
+      name: workmanager
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.5.1"
   xdg_directories:
     dependency: transitive
     description:
@@ -820,5 +820,5 @@ packages:
     source: hosted
     version: "3.1.1"
 sdks:
-  dart: ">=2.17.0 <3.0.0"
+  dart: ">=2.18.0 <3.0.0"
   flutter: ">=3.0.0"

pubspec.yaml

@@ -4,7 +4,7 @@ description: Vikunja as Flutter cross platform app
 version: 0.0.24-alpha
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.18.0 <3.0.0"
 
 dependencies:
   flutter:
@@ -29,6 +29,7 @@ dependencies:
   dotted_border: ^2.0.0+2
   package_info_plus: ^3.0.2
   url_launcher: ^6.1.7
+  workmanager: ^0.5.1
 
 dev_dependencies:
   flutter_test: