added singleton element for local event storage

README.md

@@ -11,4 +11,5 @@ A cross plattform project for android and ios to log events offline everywhere a
 
 
 ## Questions:
-- How to store not uploaded events locally?  Dumping jsons to a file? 
+- How to store not uploaded events locally?  Dumping jsons to a file?, ObjectBox,  SharedPreferences, 
+

lib/data_model.dart

-
+import 'package:shared_preferences/shared_preferences.dart';
 
 class Event{
   int id;
@@ -8,14 +8,40 @@ class Event{
   String description;
   String status;
 
-  Event({
-    required this.id,
-    required this.urn,
-    required this.label,
-    required this.type,
-    required this.description,
-    required this.status
-  });
+  Event(
+    this.id,
+    this.urn,
+    this.label,
+    this.type,
+    this.description,
+    this.status
+  );
+
+  factory Event.fromJson(Map<String, dynamic> parsedJson){
+    return Event( parsedJson['id'] as int,
+        parsedJson['urn'] as String,
+        parsedJson['label'] as String,
+        parsedJson['type'] as String,
+        parsedJson['description'] as String,
+        parsedJson['status'] as String );
+  }
+
+  @override
+  String toString(){
+    return '{ ${this.id}, ${this.urn}, ${this.label}, ${this.type}, ${this.description}, ${this.status} }';
+  }
+}
+
+abstract class EventStoreBase{
+  List<Event> store = [];
+
+  void setStore(List<Event> st){
+    store = st;
+  }
+
+  void reset(){
+    store = [];
+  }
 }
 
 class EventType{
@@ -26,4 +52,6 @@ class EventType{
     required this.name,
     required this.id
 });
-}
+}
\ No newline at end of file
+
+

lib/main.dart

@@ -2,7 +2,30 @@ import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'data_model.dart';
 
+
+class EventStoreInstance extends EventStoreBase{
+  static final EventStoreInstance _instance = EventStoreInstance._internal();
+
+  factory EventStoreInstance(){
+    return _instance;
+  }
+
+  EventStoreInstance._internal(){
+    store = [];
+  }
+
+}
+
 void main() {
+
+  //Add some dummy events to eventstore
+  EventStoreInstance events = EventStoreInstance();
+  events.store.add(Event.fromJson({'id': 8311, 'urn':'station:neumayer_iii:awi_snow_sampler_1', 'label':'SML_KO21_SC01', 'type':'Deployment', 'description':'Remi tool Tag1 1 Traverse', 'status':'PENDING' }));
+  events.store.add(Event.fromJson({'id': 8311, 'urn':'station:neumayer_iii:awi_snow_sampler_1', 'label':'SML_KO21_SC01', 'type':'Deployment', 'description':'Remi tool Tag1 1 Traverse', 'status':'PENDING' }));
+  events.store.add(Event.fromJson({'id': 8311, 'urn':'station:neumayer_iii:awi_snow_sampler_1', 'label':'SML_KO21_SC01', 'type':'Deployment', 'description':'Remi tool Tag1 1 Traverse', 'status':'PENDING' }));
+  events.store.add(Event.fromJson({'id': 8311, 'urn':'station:neumayer_iii:awi_snow_sampler_1', 'label':'SML_KO21_SC01', 'type':'Deployment', 'description':'Remi tool Tag1 1 Traverse', 'status':'PENDING' }));
+
+
   runApp(MaterialApp(
     title: 'Mobile Event Log',
     theme: ThemeData(
@@ -82,36 +105,11 @@ class AddEvent extends StatelessWidget {
 }
 
 class ViewEvents extends StatelessWidget {
-  // Add some dummy events:
-  List<Event> events = []
-    ..add(Event(
-        id: 8311,
-        urn: 'station:neumayer_iii:awi_snow_sampler_1',
-        label: 'SML_KO21_SC01',
-        type: 'Deployment',
-        description: 'Remi tool Tag1 1 Traverse',
-        status: 'PENDING'))
-    ..add(Event(
-        id: 8311,
-        urn: 'station:neumayer_iii:awi_snow_sampler_1',
-        label: 'SML_KO21_SC01',
-        type: 'Deployment',
-        description: 'Remi tool Tag1 1 Traverse',
-        status: 'PENDING'))
-    ..add(Event(
-        id: 8311,
-        urn: 'station:neumayer_iii:awi_snow_sampler_1',
-        label: 'SML_KO21_SC01',
-        type: 'Deployment',
-        description: 'Remi tool Tag1 1 Traverse',
-        status: 'PENDING'));
-
-  //for (var i = 0; i<100; i++){
-  //  events.add(Event(id: i, urn: 'station:neumayer_iii:awi_snow_sampler_1', label: 'SML_KO21_SC01', type: 'Deployment', description: 'Remi tool Tag1 1 Traverse', status: 'PENDING'));
-  //}
 
   @override
   Widget build(BuildContext context) {
+    // Get singleton to access locally stored events:
+    final EventStoreInstance events = EventStoreInstance();
     return Scaffold(
       appBar: AppBar(
         title: const Text("View Added Events"),
@@ -160,7 +158,7 @@ class ViewEvents extends StatelessWidget {
               ),
             ],
             rows: <DataRow>[
-              for (var event in events)
+              for (var event in events.store)
                 DataRow(
                   cells: <DataCell>[
                     DataCell(Text(event.id.toString())),

pubspec.lock

@@ -57,6 +57,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.0"
+  ffi:
+    dependency: transitive
+    description:
+      name: ffi
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.2"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "6.1.2"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -74,6 +88,18 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_web_plugins:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  js:
+    dependency: transitive
+    description:
+      name: js
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.6.3"
   lints:
     dependency: transitive
     description:
@@ -102,6 +128,104 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.0"
+  path_provider_linux:
+    dependency: transitive
+    description:
+      name: path_provider_linux
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.5"
+  path_provider_platform_interface:
+    dependency: transitive
+    description:
+      name: path_provider_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.3"
+  path_provider_windows:
+    dependency: transitive
+    description:
+      name: path_provider_windows
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.5"
+  platform:
+    dependency: transitive
+    description:
+      name: platform
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.1.0"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.2"
+  process:
+    dependency: transitive
+    description:
+      name: process
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.2.4"
+  shared_preferences:
+    dependency: "direct main"
+    description:
+      name: shared_preferences
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.12"
+  shared_preferences_android:
+    dependency: transitive
+    description:
+      name: shared_preferences_android
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.10"
+  shared_preferences_ios:
+    dependency: transitive
+    description:
+      name: shared_preferences_ios
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.9"
+  shared_preferences_linux:
+    dependency: transitive
+    description:
+      name: shared_preferences_linux
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.4"
+  shared_preferences_macos:
+    dependency: transitive
+    description:
+      name: shared_preferences_macos
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.2"
+  shared_preferences_platform_interface:
+    dependency: transitive
+    description:
+      name: shared_preferences_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  shared_preferences_web:
+    dependency: transitive
+    description:
+      name: shared_preferences_web
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.3"
+  shared_preferences_windows:
+    dependency: transitive
+    description:
+      name: shared_preferences_windows
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.4"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -163,5 +287,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.1"
+  win32:
+    dependency: transitive
+    description:
+      name: win32
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.3.6"
+  xdg_directories:
+    dependency: transitive
+    description:
+      name: xdg_directories
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.2.0"
 sdks:
   dart: ">=2.15.1 <3.0.0"
+  flutter: ">=2.5.0"

pubspec.yaml

@@ -30,6 +30,8 @@ dependencies:
   flutter:
     sdk: flutter
 
+  shared_preferences: ^2.0.12
+
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.