moved json event file export to configuration widget

lib/addevent.dart

@@ -143,7 +143,7 @@ class _AddEventPageState extends State<AddEvent>  {
     if (RegExp(r'^[a-z A-Z . \- 0-9 , ( ) + - _ :]+$').hasMatch(
         eventStore.currentEvent.label)) {
       if (RegExp(r'^[a-z A-Z . \- 0-9 , ( ) + - _ :]+$').hasMatch(
-          eventStore.currentEvent.description)) {
+          eventStore.currentEvent.description) || eventStore.currentEvent.description == '') {
         if(_validateLatitude(eventStore.currentEvent.latitude)){
           if(_validateLongitude(eventStore.currentEvent.longitude)){
             if(_validateElevation(eventStore.currentEvent.elevation)){
@@ -282,9 +282,11 @@ class _AddEventPageState extends State<AddEvent>  {
                     validator: (value) {
                       if (!RegExp(r'^[a-z A-Z . \- 0-9 , ( ) + - _ :]+$').hasMatch(
                           value!)) {
+                        if(value == ''){
+                          return null;  //An empty description is also allowed.
+                        }
                         return "Only: a-z , A-Z , _ , 0-9 , ,(Comma) , ( , ) , + , - , . , :";
                       } else {
-                        //eventStore.currentEvent.label = value;
                         return null; // Entered Text is valid
                       }
                     },
@@ -486,7 +488,7 @@ class _AddEventPageState extends State<AddEvent>  {
                   //child: const Icon(Icons.check),
                 )
             ),
-            const SizedBox(width: 10.0),
+            const SizedBox(width: 5.0),
           ],
         ),
       );

lib/configuration.dart

 import 'dart:convert';
+import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'datamodel.dart';
 import 'sensorconnector.dart';
 import 'databaseconnector.dart';
 import 'package:shared_preferences/shared_preferences.dart';
+import 'package:path/path.dart';
+import 'package:path_provider/path_provider.dart';
 
 class Configuration extends StatefulWidget {
   const Configuration({Key? key}) : super(key: key);
@@ -19,10 +22,37 @@ class _MyHomePageState extends State<Configuration> {
   late Future<List<EventType>> futureEventTypes;
   late Future<List<Device>> futureDevices;
   late Future<String> futureAuthToken;
-
+  var database = DatabaseInstance();
   SensorConnector connector = SensorConnector();
   final ConfigurationStoreInstance configuration = ConfigurationStoreInstance();
 
+
+  Future<void> dumpToFile() async{
+    var date = DateTime.now().toUtc();
+    var isoDate = date.toIso8601String();
+
+    String filename =
+        date.year.toString().padLeft(4, '0') +
+            date.month.toString().padLeft(2, '0') +
+            date.day.toString().padLeft(2, '0') +
+            date.hour.toString().padLeft(2, '0') +
+            date.minute.toString().padLeft(2, '0') +
+            date.second.toString().padLeft(2, '0') +
+            '_events.json';
+
+    String eventsJson = await database.eventDump();
+
+    final Directory? directory = await getExternalStorageDirectory();
+    if(directory != null) {
+      String filepath = join(directory.path, filename);
+
+      final File file = File(filepath);
+      await file.writeAsString(eventsJson);
+      debugPrint('Stored file at: ' + filepath);
+    }
+  }
+
+
   Future<void> updateConfiguration() async {
     final EventStoreInstance event = EventStoreInstance();
 
@@ -197,18 +227,19 @@ class _MyHomePageState extends State<Configuration> {
           child: Row(
             mainAxisAlignment: MainAxisAlignment.end,
             children: [
-              const SizedBox(width: 10.0),
+              //const SizedBox(width: 10.0),
               FloatingActionButton.extended(
                 heroTag: null,
-                tooltip: 'Reset all data',
-                icon: const Icon(Icons.cancel),
-                label: const Text('Reset all'),
+                tooltip: 'Export events to local .json file',
+                icon: const Icon(Icons.download),
+                label: const Text('Export Events'),
                 onPressed: () {
-                  //events.reset();  //TODO: remove before release!
-                  var db = DatabaseInstance();
-                  db.delete();
+                  dumpToFile();
 
-                  configuration.reset();  //TODO: remove before release this is not a real use case!
+                  //events.reset();  //TODO: remove before release this is not a real use case!
+                  //var db = DatabaseInstance();
+                  //db.delete();
+                  //configuration.reset();
                 },
               ),
               const SizedBox(width: 50),
@@ -222,7 +253,7 @@ class _MyHomePageState extends State<Configuration> {
                   //TODO: display failed as user feedback somehow
                 },
               ),
-              const SizedBox(width: 10.0),
+              const SizedBox(width: 5.0),
             ],
           ),
         )

lib/viewevents.dart

 import 'dart:io';
 import 'package:flutter/material.dart';
-import 'package:path_provider/path_provider.dart';
 import 'datamodel.dart';
 import 'sensorconnector.dart';
 import 'databaseconnector.dart';
-import 'package:path/path.dart';
 
 class ViewEvents extends StatefulWidget {
   const ViewEvents({Key? key}) : super(key: key);
@@ -34,24 +32,6 @@ class _ViewEvents extends State<ViewEvents> {
     setState(() {});  //Got events from database, so update UI
   }
 
-  Future<void> dumpToFile() async{
-    //localEvents = await database.getEvents();
-    var date = DateTime.now().toUtc();
-    var isoDate = date.toIso8601String();
-
-    String eventsJson = await database.eventDump();
-
-    final Directory? directory = await getExternalStorageDirectory();
-    if(directory != null) {
-      String filename = 'time_event_dump.json';
-      String filepath = join(directory.path, filename);
-
-      final File file = File(filepath);
-      await file.writeAsString(eventsJson);
-      debugPrint('Stored file at: ' + filepath);
-    }
-  }
-
   @override
   void initState() {
     _syncStatus = '';
@@ -279,8 +259,6 @@ class _ViewEvents extends State<ViewEvents> {
               label: const Text('Sync'),
               onPressed: () {
                 syncEvents();
-
-                dumpToFile(); //TODO. Move to right button.
               },
             ),
           ),
@@ -291,4 +269,3 @@ class _ViewEvents extends State<ViewEvents> {
   }
 }
 //TODO: allow editing fields here. Check validation of input value!
-//TODO: dump events to json for local backups in the field. "dumpToFile"
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