some more ui improvements

lib/addevent.dart

@@ -95,9 +95,7 @@ class _AddEventPageState extends State<AddEvent>  {
     }catch(e){
       debugPrint('Canceling location stream failed');
     }
-
     super.dispose();
-    //TODO: only if initialized positionStream.cancel();
   }
 
   void _storeCurrentEvent() {
@@ -120,7 +118,6 @@ class _AddEventPageState extends State<AddEvent>  {
   }
 
   //TODO: add field validators for freetext fields. Check allowed characters in sensor.awi.de
-
   @override
   Widget build(BuildContext context) {
     /* Get singletons to access relevant data here.*/
@@ -128,7 +125,6 @@ class _AddEventPageState extends State<AddEvent>  {
     final ConfigurationStoreInstance configuration = ConfigurationStoreInstance();
     String gnssStatusText = "";
 
-
     if (true == syncGNSSData){
       // Update current event coordinates from GNSS stream
       eventsStore.currentEvent.latitude = lat;
@@ -153,14 +149,16 @@ class _AddEventPageState extends State<AddEvent>  {
     if (configuration.initialized == true) {
       return Scaffold(
         appBar: AppBar(title: const Text("Add Event")),
-        body:
+        body: SingleChildScrollView( child:
         Column(
             mainAxisAlignment: MainAxisAlignment.spaceEvenly,
             children: <Widget>[
+              const SizedBox(height: 10.0),
               TextFormField(
                 initialValue: eventsStore.currentEvent.label,
                 autovalidateMode: AutovalidateMode.onUserInteraction,
                 decoration: const InputDecoration(
+                    border: OutlineInputBorder(),
                     labelText: 'Label',
                     errorText: 'Only: a-z , A-Z , _ , 0-9 , ,(Comma) , ( , ) , + , - , . , :'
                 ),
@@ -177,10 +175,12 @@ class _AddEventPageState extends State<AddEvent>  {
                   }
                 },
               ),
+              const SizedBox(height: 10.0),
               DropdownButtonFormField(
                   value: eventsStore.currentEvent.type,
                   isExpanded: true,
                   decoration: const InputDecoration(
+                    border: OutlineInputBorder(),
                     labelText: 'Event Type',
                   ),
                   items:
@@ -194,10 +194,12 @@ class _AddEventPageState extends State<AddEvent>  {
                     eventsStore.currentEvent.type = value.toString();
                   }
               ),
+              const SizedBox(height: 10.0),
               DropdownButtonFormField(
                   value: eventsStore.currentEvent.urn,
                   isExpanded: true,
                   decoration: const InputDecoration(
+                    border: OutlineInputBorder(),
                     labelText: 'URN',
                   ),
                   items:
@@ -213,18 +215,22 @@ class _AddEventPageState extends State<AddEvent>  {
                         configuration.getDeviceIdFromUrn(value.toString());
                   }
               ),
+              const SizedBox(height: 10.0),
               TextFormField(
+                minLines: 3,
+                maxLines: 3,
                 initialValue: eventsStore.currentEvent.description,
                 decoration: const InputDecoration(
+                    border: OutlineInputBorder(),
                     labelText: 'Description'
                 ),
                 onChanged: (value) {
                   eventsStore.currentEvent.description = value;
                 },
               ),
-
+              const SizedBox(height: 10.0),
               Row(
-                  mainAxisSize: MainAxisSize.min,
+                  mainAxisSize: MainAxisSize.max,
                   children: <Widget>[
                     Flexible(child:
                     TextFormField(
@@ -264,6 +270,7 @@ class _AddEventPageState extends State<AddEvent>  {
                     ),
                   ]
               ),
+              const SizedBox(height: 10.0),
               TextFormField(
                   readOnly: false,
                   enabled: !syncGNSSData,
@@ -277,6 +284,7 @@ class _AddEventPageState extends State<AddEvent>  {
                     eventsStore.currentEvent.latitude = value;
                   }
               ),
+              const SizedBox(height: 10.0),
               TextFormField(
                   readOnly: false,
                   enabled: !syncGNSSData,
@@ -291,6 +299,7 @@ class _AddEventPageState extends State<AddEvent>  {
                     eventsStore.currentEvent.longitude = value;
                   }
               ),
+              const SizedBox(height: 10.0),
               TextFormField(
                   readOnly: false,
                   enabled: !syncGNSSData,
@@ -305,6 +314,7 @@ class _AddEventPageState extends State<AddEvent>  {
                   }
               ),
             ]),
+        ),
         bottomNavigationBar: Row(
           mainAxisAlignment: MainAxisAlignment.end,
           children: [