added switch to show all events. Default only show pending events due to performance reasons

lib/datamodel.dart

@@ -391,6 +391,7 @@ class ConfigurationStoreInstance extends ConfigurationStoreBase {
 
 abstract class EventStoreBase{
   bool gnssSync = true;
+  bool showAllEvents = false;
   Event currentEvent = Event(
       id: 0,
       urnId:-1,
@@ -410,13 +411,15 @@ abstract class EventStoreBase{
   Map<String, dynamic> toMap() {
     return {
       'currentEvent' : currentEvent.toJson(),
-      'gnssSync' : gnssSync
+      'gnssSync' : gnssSync,
+      'showAllEvents' : showAllEvents
     };
   }
 
   void fromMap(Map<String, dynamic> map) {
     currentEvent = Event.fromJson(map['currentEvent']);
     gnssSync = map['gnssSync'];
+    showAllEvents = map['showAllEvents'];
   }
 }
 

lib/viewevents.dart

@@ -15,17 +15,30 @@ class _ViewEvents extends State<ViewEvents> {
   final EventStoreInstance _events = EventStoreInstance();
   String _status = '';
   TextStyle _statusStyle = const TextStyle(color: Colors.black);
+  String _appBarText = '';
   var database = DatabaseInstance();
   List<Event> _localEvents = [];
 
 
   Future<void> fetchEventsFromDb() async{
-    _localEvents = await database.getEvents();
-    int pendingEvents = await database.getPendingEventCnt();
+    final EventStoreInstance event = EventStoreInstance();
+    int pendingEvents = 0;
+
+    if (event.showAllEvents == false) {
+      _appBarText = 'Pending Events';
+      //Get only pending events
+      _localEvents = await database.getPendingEvents();
+      pendingEvents = _localEvents.length;
+
+    }else {
+      _appBarText = 'All Events';
+      _localEvents = await database.getEvents();
+      pendingEvents = await database.getPendingEventCnt();
+    }
 
     _status = pendingEvents.toString() + ' event(s) pending';
     _statusStyle = const TextStyle(color: Colors.black);
-    setState(() {});  //Got events from database, so update UI
+    setState(() {}); //Got events from database, so update UI
   }
 
   @override
@@ -84,9 +97,20 @@ class _ViewEvents extends State<ViewEvents> {
 
   @override
   Widget build(BuildContext context) {
+    final EventStoreInstance event = EventStoreInstance();
     return Scaffold(
       appBar: AppBar(
         title: const Text("View & Sync"),
+        actions: <Widget>[
+          Text(_appBarText, style: const TextStyle(fontStyle: FontStyle.italic),),
+          Switch(  //Enable showing all or only pending events. Default is to show only pending events
+              value: event.showAllEvents,
+              onChanged: (value) {
+                event.showAllEvents = value;
+                fetchEventsFromDb();
+                setState(() {});
+              }),
+        ],
       ),
       body: Container(
         margin: const EdgeInsets.symmetric(horizontal: 5.0),
@@ -260,3 +284,4 @@ class _ViewEvents extends State<ViewEvents> {
   }
 }
 //TODO: allow editing fields here.
+//TODO: show only pending events.
\ No newline at end of file