some simple sync feedback implemented

lib/viewevents.dart

@@ -13,9 +13,16 @@ class ViewEvents extends StatefulWidget {
 
 class _ViewEvents extends State<ViewEvents> {
   // Get singleton to access locally stored events:
-  EventStoreInstance events = EventStoreInstance();
+  EventStoreInstance _events = EventStoreInstance();
+  String _sync_status = '';
   //TODO: add exception handling and display exceptions to user.
 
+  @override
+  void initState() {
+    _sync_status = _events.getPendingEventCount().toString() + ' event(s) pending';
+    super.initState();
+  }
+
   Future<bool> syncEvents() async {
     //final EventStoreInstance events = EventStoreInstance();
     final ConfigurationStoreInstance configuration = ConfigurationStoreInstance();
@@ -26,11 +33,11 @@ class _ViewEvents extends State<ViewEvents> {
         configuration.loginInformation.password);
 
     if (token != null) {
-      _synccounter = events.getPendingEventCount();
-      debugPrint('Number of Events: ' + events.events.length.toString());
+      _synccounter = _events.getPendingEventCount();
+      debugPrint('Number of Events: ' + _events.events.length.toString());
       debugPrint('Number of Pending Events: ' + _synccounter.toString());
       var index = 0;
-      for (var event in events.events) {
+      for (var event in _events.events) {
         if (event.status == 'PENDING') {
           debugPrint('Idx: ' + index.toString() + ' ' +
               event.toSensorJson().toString());
@@ -41,9 +48,12 @@ class _ViewEvents extends State<ViewEvents> {
             debugPrint('put success, remaining events: ' + _synccounter.toString());
             event.status = 'EXPORTED'; //Update event status so that it is only exported once.
             setState(() {});
+          }else{
+            _sync_status = 'export failed: ' + event.urn;
           }
         }
       }
+      _sync_status = 'export success';
       return true;
     }
     return false;
@@ -134,7 +144,7 @@ class _ViewEvents extends State<ViewEvents> {
               ),
             ],
             rows: <DataRow>[
-              for (var event in events.events)
+              for (var event in _events.events)
                 DataRow(
                   cells: <DataCell>[
                     DataCell(Text(event.id.toString())),
@@ -208,58 +218,20 @@ class _ViewEvents extends State<ViewEvents> {
       bottomNavigationBar: Row(
         mainAxisAlignment: MainAxisAlignment.spaceBetween,
         children: [
-          Text('Remaining events to sync: ' + events.getPendingEventCount().toString()),
+          const SizedBox(width: 10),
+          Text(_sync_status),
           FloatingActionButton.extended(
             heroTag: null,
             tooltip: 'Upload Events',
             icon: null,
             label: const Text('Sync'),
             onPressed: () {
-
               syncEvents();
-              //showDialog(
-              //  barrierDismissible: false,
-              //  context: context,
-              //  builder: (BuildContext context) => _buildPopupDialog(context),
-              //);
             },
           ),
         ],
       ),
     );
   }
-
-  Widget _buildPopupDialog(BuildContext context) {
-
-    return AlertDialog(
-      title: const Text('Uploading Events'),
-
-      content: Column(
-        mainAxisSize: MainAxisSize.min,
-        crossAxisAlignment: CrossAxisAlignment.center,
-        children: <Widget>[
-          //Text("Progress"),
-          const CircularProgressIndicator(),
-          const SizedBox(height: 10),
-          Text('Remaining events to sync'),
-        ],
-      ),
-      actions: <Widget>[
-        TextButton(
-          onPressed: () {
-            //syncEvents();
-
-            setState(() {
-
-            });
-            //Navigator.of(context).pop();
-          },
-          //textColor: Theme.of(context).primaryColor,
-          child: const Text('Close'),
-        ),
-      ],
-    );
-  }
 }
-
 //TODO: allow editing fields here. Check validation of input value!
\ No newline at end of file