update pubspec

lib/app.dart

@@ -59,7 +59,7 @@ class _AppState extends State<App> {
   final CartonSizeModel cartonSizeModel = new CartonSizeModel();
   final ProcessingModel processingModel = new ProcessingModel();
 
-  AppTranslationsDelegate _newLocaleDelegate;
+  late AppTranslationsDelegate _newLocaleDelegate;
 
   @override
   void initState() {
@@ -81,7 +81,8 @@ class _AppState extends State<App> {
       ..addModel(cartonSizeModel)
       ..addModel(processingModel);
 
-    _newLocaleDelegate = AppTranslationsDelegate(newLocale: null);
+    _newLocaleDelegate = AppTranslationsDelegate(
+        newLocale: Translation().supportedLocales().first);
     Translation().onLocaleChanged = onLocaleChange;
   }
 

lib/config.dart

@@ -1,11 +1,16 @@
 import 'package:flutter/material.dart';
 import 'package:logging/logging.dart';
 
-enum Flavor { DEV, STAGING, PRODUCTION, LOCAL }
-const FlavorNames = ["Development", "Staging", "Production", "Local"];
+enum Flavor { UNSET, DEV, STAGING, PRODUCTION, LOCAL }
+const FlavorNames = ["Unset", "Development", "Staging", "Production", "Local"];
 
 class Config {
-  static Config _instance;
+  static Config _instance = Config(
+      flavor: Flavor.UNSET,
+      apiURL: "",
+      bucketName: "",
+      reportProjectID: "",
+      reportURL: "");
 
   final Flavor flavor;
   final String name;
@@ -17,14 +22,14 @@ class Config {
   final String bucketName;
 
   factory Config(
-      {@required Flavor flavor,
-      @required String apiURL,
-      @required String reportURL,
-      @required String reportProjectID,
-      @required String bucketName,
+      {required Flavor flavor,
+      required String apiURL,
+      required String reportURL,
+      required String reportProjectID,
+      required String bucketName,
       Color color: Colors.blue,
       Level level: Level.SEVERE}) {
-    _instance ??= Config._internal(flavor, FlavorNames[flavor.index], color,
+    _instance = Config._internal(flavor, FlavorNames[flavor.index], color,
         apiURL, reportURL, level, reportProjectID, bucketName);
 
     Logger.root.level = level;

lib/localization/app_translations_delegate.dart

@@ -6,7 +6,7 @@ import 'transalation.dart';
 class AppTranslationsDelegate extends LocalizationsDelegate<AppTranslations> {
   final Locale newLocale;
 
-  const AppTranslationsDelegate({this.newLocale});
+  const AppTranslationsDelegate({required this.newLocale});
 
   @override
   bool isSupported(Locale locale) {
@@ -22,4 +22,4 @@ class AppTranslationsDelegate extends LocalizationsDelegate<AppTranslations> {
   bool shouldReload(LocalizationsDelegate<AppTranslations> old) {
     return true;
   }
-}
+}

lib/localization/transalation.dart

@@ -23,5 +23,5 @@ class Translation {
       supportedLanguagesCodes.map<Locale>((language) => Locale(language, ""));
 
   //function to be invoked when changing the language
-  LocaleChangeCallback onLocaleChanged;
+  LocaleChangeCallback? onLocaleChanged;
 }

lib/pagination/paginator_listener.dart

@@ -16,22 +16,22 @@ class PaginatorListener<T> {
 
   List<String> ids = [];
   List<T> data = [];
-  DocumentSnapshot prev;
+  DocumentSnapshot? prev;
   int rowPerLoad = 10;
   bool ended = false;
   bool isLoading = false;
   bool insertNewByListener = false;
   ToObj toObj;
-  CallBack onChange;
+  CallBack? onChange;
 
-  StreamSubscription<QuerySnapshot> listener;
-  Query listeningQuery;
-  Query pageQuery;
+  StreamSubscription<QuerySnapshot>? listener;
+  Query? listeningQuery;
+  Query? pageQuery;
 
   PaginatorListener(this.toObj,
       {this.onChange, this.rowPerLoad = 10, this.insertNewByListener = false});
 
-  Future<bool> refresh({Query listeningQuery, Query pageQuery}) {
+  Future<bool> refresh({Query? listeningQuery, Query? pageQuery}) {
     this.listeningQuery = listeningQuery ?? this.listeningQuery;
     this.pageQuery = pageQuery ?? this.pageQuery;
     _clearState();
@@ -45,7 +45,7 @@ class PaginatorListener<T> {
     data = [];
     ended = false;
     isLoading = false;
-    if (listener != null) listener.cancel();
+    if (listener != null) listener!.cancel();
     listener = null;
   }
 
@@ -58,35 +58,39 @@ class PaginatorListener<T> {
   final String isDeletedField = 'is_deleted';
   void _initListener() {
     Query _query =
-        listeningQuery.orderBy(updateTimeField, descending: true).limit(1);
-    _query.getDocuments(source: Source.server).then((QuerySnapshot snapshot) {
-      int count = snapshot.documents.length;
+        listeningQuery!.orderBy(updateTimeField, descending: true).limit(1);
+    _query
+        .get(GetOptions(source: Source.server))
+        .then((QuerySnapshot snapshot) {
+      int count = snapshot.docs.length;
       int updateTime = 0;
       if (count == 1) {
-        updateTime = snapshot.documents[0].data[updateTimeField];
+        Map<String, dynamic> data =
+            snapshot.docs[0].data()! as Map<String, dynamic>;
+        updateTime = data[updateTimeField];
       }
 
-      Query _queryListener = listeningQuery
+      Query _queryListener = listeningQuery!
           .where(updateTimeField, isGreaterThan: updateTime)
           .orderBy(updateTimeField, descending: true);
 
-      if (listener != null) listener.cancel();
+      if (listener != null) listener!.cancel();
       listener =
           _queryListener.snapshots(includeMetadataChanges: true).listen((qs) {
-        qs.documentChanges.forEach((c) {
+        qs.docChanges.forEach((c) {
           switch (c.type) {
             case DocumentChangeType.added:
-              _update(c.document.documentID, c.document.data);
+              _update(c.doc.id, c.doc.data() as Map<String, dynamic>);
               break;
             case DocumentChangeType.modified:
-              _update(c.document.documentID, c.document.data);
+              _update(c.doc.id, c.doc.data() as Map<String, dynamic>);
               break;
             case DocumentChangeType.removed:
-              _remove(c.document.documentID, c.document.data);
+              _remove(c.doc.id, c.doc.data() as Map<String, dynamic>);
               break;
             default:
           }
-          if (onChange != null) onChange();
+          if (onChange != null) onChange!();
         });
       });
     });
@@ -129,26 +133,26 @@ class PaginatorListener<T> {
     return this._load();
   }
 
-  Future<bool> _load({CallBack onStarted, CallBack onFinished}) async {
+  Future<bool> _load({CallBack? onStarted, CallBack? onFinished}) async {
     if (ended) return ended;
     Query _query =
-        prev != null ? pageQuery.startAfterDocument(prev) : pageQuery;
+        prev != null ? pageQuery!.startAfterDocument(prev!) : pageQuery!;
     try {
       isLoading = true;
       if (onStarted != null) {
         onStarted();
       }
-      if (onChange != null) onChange();
+      if (onChange != null) onChange!();
       await _query
           .where(isDeletedField, isEqualTo: false)
           .limit(rowPerLoad)
-          .getDocuments(source: Source.server)
+          .get(GetOptions(source: Source.server))
           .then((QuerySnapshot snapshot) {
-        int count = snapshot.documents.length;
+        int count = snapshot.docs.length;
         ended = count < rowPerLoad;
-        prev = count > 0 ? snapshot.documents[count - 1] : prev;
-        snapshot.documents.forEach((e) {
-          _add(e.documentID, e.data);
+        prev = count > 0 ? snapshot.docs[count - 1] : prev;
+        snapshot.docs.forEach((e) {
+          _add(e.id, e.data() as Map<String, dynamic>);
         });
       });
     } catch (e) {
@@ -156,7 +160,7 @@ class PaginatorListener<T> {
     } finally {
       isLoading = false;
       if (onFinished != null) onFinished();
-      if (onChange != null) onChange();
+      if (onChange != null) onChange!();
     }
     return ended;
   }

lib/pagination/paginator_listview.dart

@@ -10,19 +10,17 @@ typedef OnScroll = void Function(bool down);
 class PaginatorListView<T> extends StatelessWidget {
   final PaginatorListener<T> paginatorListener;
   final RowBuilder rowBuilder;
-  final OnScroll onScroll;
+  final OnScroll? onScroll;
   final ScrollController _scrollController;
   final Color color;
 
   PaginatorListView(
-      {Key key,
-      this.paginatorListener,
-      this.rowBuilder,
+      {Key? key,
+      required this.paginatorListener,
+      required this.rowBuilder,
       this.onScroll,
       this.color = Colors.blueAccent})
       : _scrollController = ScrollController(),
-        assert(paginatorListener != null),
-        assert(rowBuilder != null),
         super(key: key) {
     _scrollController.addListener(() async {
       if (_scrollController.position.pixels ==
@@ -32,7 +30,7 @@ class PaginatorListView<T> extends StatelessWidget {
       if (onScroll != null) {
         var down = _scrollController.position.userScrollDirection ==
             ScrollDirection.forward;
-        onScroll(down);
+        onScroll!(down);
       }
     });
   }