implement time frame to record screen

diabeta_app/lib/screens/dashboard_screen.dart

@@ -127,7 +127,7 @@ class _DashboardScreenState extends State<DashboardScreen> {
             builder: (context, AsyncSnapshot snapshot) {
               if (snapshot.hasData) {
                 int length = snapshot.data!.length;
-                return ListView(
+                return length >0 ? ListView(
                   shrinkWrap: true,
                   physics: const NeverScrollableScrollPhysics(),
                   children: List.generate(
@@ -152,6 +152,17 @@ class _DashboardScreenState extends State<DashboardScreen> {
                       );
                     },
                   ),
+                ): Padding(
+                  padding: const EdgeInsets.only(top: 50.0),
+                  child: Column(
+                    children: [
+                      Container(child: Center(child: Text(" No records, yet.")),),
+                      SizedBox(
+                        height: 8,
+                      ),
+                      Container(child: Center(child: Text(" Add your first record.")),),
+                    ],
+                  ),
                 );
               } else {
                 return const Center(

diabeta_app/lib/screens/diabetes/screens/logbook_screen.dart

@@ -23,7 +23,7 @@ class _LogbookScreenState extends State<LogbookScreen> {
         builder: (context, AsyncSnapshot snapshot) {
           if (snapshot.hasData) {
             int length = snapshot.data!.length;
-            return ListView(
+            return length>0 ? ListView(
               shrinkWrap: true,
               children: List.generate(length, (index) {
                 return Center(
@@ -44,7 +44,7 @@ class _LogbookScreenState extends State<LogbookScreen> {
                   ),
                 );
               }),
-            );
+            ): Container(child: Center(child: Text("No data to display."),),);
           } else {
             return const Center(
               child: CircularProgressIndicator(),

diabeta_app/lib/services/glucose_log_service.dart

@@ -206,7 +206,7 @@ class GlucoseLogService {
   }
 
   static Future<List<LogEntry>> getRecordsByTimeFrame(
-      String accountId, String period) async {
+      String accountId, String period, {bool isDecending = true}) async {
     List<LogEntry> recordList = [];
     DateTime date = DateTime.now();
 
@@ -218,7 +218,7 @@ class GlucoseLogService {
           .where("userId", isEqualTo: accountId)
           .where("dateTime",
               isGreaterThanOrEqualTo: Timestamp.fromDate(firstDayOfWeek))
-          .orderBy("dateTime", descending: true)
+          .orderBy("dateTime", descending: isDecending)
           .get()
           .then((QuerySnapshot querySnapshot) {
         querySnapshot.docs.forEach((doc) {
@@ -245,7 +245,7 @@ class GlucoseLogService {
           .where("dateTime",
               isGreaterThanOrEqualTo:
                   Timestamp.fromDate(DateTime(now.year, now.month, 1)))
-          .orderBy("dateTime", descending: true)
+          .orderBy("dateTime", descending: isDecending)
           .get()
           .then((QuerySnapshot querySnapshot) {
         querySnapshot.docs.forEach((doc) {
@@ -272,7 +272,7 @@ class GlucoseLogService {
           .where("dateTime",
               isGreaterThanOrEqualTo:
                   Timestamp.fromDate(DateTime(now.year, 1, 1)))
-          .orderBy("dateTime", descending: true)
+          .orderBy("dateTime", descending: isDecending)
           .get()
           .then((QuerySnapshot querySnapshot) {
         querySnapshot.docs.forEach((doc) {
@@ -295,7 +295,7 @@ class GlucoseLogService {
     } else if (period == "All records") {
       await _records
           .where("userId", isEqualTo: accountId)
-          .orderBy("dateTime", descending: true)
+          .orderBy("dateTime", descending: isDecending)
           .get()
           .then((QuerySnapshot querySnapshot) {
         querySnapshot.docs.forEach((doc) {