null safety

lib/pages/customer/customer_editor.dart

@@ -14,7 +14,7 @@ import 'package:provider/provider.dart';
 typedef void FindCallBack();
 
 class CustomerEditor extends StatefulWidget {
-  final User customer;
+  final User? customer;
   const CustomerEditor({this.customer});
   @override
   _CustomerEditorState createState() => _CustomerEditorState();
@@ -34,17 +34,17 @@ class _CustomerEditorState extends State<CustomerEditor> {
       children: <Widget>[
         Expanded(
             child: DisplayText(
-          text: widget.customer.phoneNumber,
+          text: widget.customer!.phoneNumber,
           labelTextKey: "customer.phone",
           iconData: Icons.phone,
         )),
         IconButton(
             icon: Icon(Icons.open_in_new, color: primaryColor),
-            onPressed: () => call(context, widget.customer.phoneNumber)),
+            onPressed: () => call(context, widget.customer!.phoneNumber)),
       ],
     );
 
-    final enabled = widget.customer.status != user_disabled_status;
+    final enabled = widget.customer!.status != user_disabled_status;
     final enableBox = LocalButton(
       textKey: enabled ? "customer.disable.btn" : "customer.enable.btn",
       iconData: enabled ? Icons.lock : Icons.lock_open,
@@ -68,7 +68,7 @@ class _CustomerEditorState extends State<CustomerEditor> {
                 onPressed: () => Navigator.of(context).pop(),
               ),
               title: Text(
-                widget.customer.name,
+                widget.customer!.name,
                 style: TextStyle(
                   fontSize: 20,
                   color: primaryColor,
@@ -81,26 +81,26 @@ class _CustomerEditorState extends State<CustomerEditor> {
                 children: <Widget>[
                   phoneNumberBox,
                   DisplayText(
-                    text: widget.customer.fcsID,
+                    text: widget.customer!.fcsID,
                     labelTextKey: "customer.fcs.id",
                     icon: FcsIDIcon(),
                   ),
                   DisplayText(
-                    text: widget.customer.status,
+                    text: widget.customer!.status,
                     labelTextKey: "customer.status",
                     iconData: Icons.add_alarm,
                   ),
                   SizedBox(
                     height: 20,
                   ),
-                  widget.customer.requested
+                  widget.customer!.requested
                       ? fcsButton(
                           context,
                           getLocalString(
                               context, "customer.invitation.request.confirm"),
                           callack: _add)
                       : Container(),
-                  widget.customer.joined || widget.customer.disabled
+                  widget.customer!.joined || widget.customer!.disabled
                       ? enableBox
                       : Container()
                 ],
@@ -119,7 +119,7 @@ class _CustomerEditorState extends State<CustomerEditor> {
       CustomerModel customerModel =
           Provider.of<CustomerModel>(context, listen: false);
       try {
-        await customerModel.acceptRequest(widget.customer.id);
+        await customerModel.acceptRequest(widget.customer!.id);
         Navigator.pop(context);
       } catch (e) {
         showMsgDialog(context, "Error", e.toString());
@@ -139,7 +139,7 @@ class _CustomerEditorState extends State<CustomerEditor> {
     CustomerModel customerModel =
         Provider.of<CustomerModel>(context, listen: false);
     try {
-      await customerModel.enableUser(widget.customer, enabled);
+      await customerModel.enableUser(widget.customer!, enabled);
       Navigator.pop(context);
     } catch (e) {
       showMsgDialog(context, "Error", e.toString());

lib/pages/customer/customer_list.dart

@@ -233,11 +233,11 @@ class _CustomerListState extends State<CustomerList> {
   _share(User user) async {
     MainModel mainModel = Provider.of<MainModel>(context, listen: false);
     String appUrl = mainModel.setting.appUrl;
-    final RenderBox box = context.findRenderObject();
+    final RenderBox? box = context.findRenderObject() as RenderBox;
     await Share.share(
         "Join us on FCS Logistics App. Here is the link:\n $appUrl\n" +
             user.share,
         subject: "Invitation to FCS Logistics App",
-        sharePositionOrigin: box.localToGlobal(Offset.zero) & box.size);
+        sharePositionOrigin: box!.localToGlobal(Offset.zero) & box.size);
   }
 }

lib/pages/customer/invitation_create.dart

@@ -19,7 +19,7 @@ class _InvitationCreateState extends State<InvitationCreate> {
   TextEditingController _phoneController = new TextEditingController();
 
   bool _isLoading = false;
-  String dialCode;
+  late String dialCode;
 
   @override
   void initState() {
@@ -85,7 +85,7 @@ class _InvitationCreateState extends State<InvitationCreate> {
                   ),
                   Container(
                     decoration: BoxDecoration(
-                        border: Border.all(color: Colors.grey[400], width: 1),
+                        border: Border.all(color: Colors.grey.shade400, width: 1),
                         borderRadius: BorderRadius.all(Radius.circular(12.0))),
                     child: CountryCodePicker(
                       onChanged: _countryChange,
@@ -140,7 +140,7 @@ class _InvitationCreateState extends State<InvitationCreate> {
 
   _countryChange(CountryCode countryCode) {
     setState(() {
-      dialCode = countryCode.dialCode;
+      dialCode = countryCode.dialCode!;
     });
   }
 

lib/pages/customer/invitation_editor.dart

@@ -11,7 +11,7 @@ import 'package:provider/provider.dart';
 typedef void FindCallBack();
 
 class InvitationEditor extends StatefulWidget {
-  final User customer;
+  final User? customer;
   const InvitationEditor({this.customer});
   @override
   _InvitationEditorState createState() => _InvitationEditorState();
@@ -31,13 +31,13 @@ class _InvitationEditorState extends State<InvitationEditor> {
       children: <Widget>[
         Expanded(
             child: DisplayText(
-          text: widget.customer.phoneNumber,
+          text: widget.customer!.phoneNumber,
           labelTextKey: getLocalString(context, "customer.phone"),
           iconData: Icons.phone,
         )),
         IconButton(
             icon: Icon(Icons.open_in_new, color: primaryColor),
-            onPressed: () => call(context, widget.customer.phoneNumber)),
+            onPressed: () => call(context, widget.customer!.phoneNumber)),
       ],
     );
 
@@ -57,7 +57,7 @@ class _InvitationEditorState extends State<InvitationEditor> {
               onPressed: () => Navigator.of(context).pop(),
             ),
             title: Text(
-              widget.customer.name,
+              widget.customer!.name,
               style: TextStyle(fontSize: 20, color: primaryColor),
             ),
           ),
@@ -87,7 +87,7 @@ class _InvitationEditorState extends State<InvitationEditor> {
       CustomerModel customerModel =
           Provider.of<CustomerModel>(context, listen: false);
       try {
-        await customerModel.deleteInvite(widget.customer.phoneNumber);
+        await customerModel.deleteInvite(widget.customer!.phoneNumber);
         Navigator.pop(context);
       } catch (e) {
         showMsgDialog(context, "Error", e.toString());

lib/pages/customer/model/customer_model.dart

@@ -12,8 +12,8 @@ class CustomerModel extends BaseModel {
 
   List<User> customers = [];
   List<User> invitations = [];
-  StreamSubscription<QuerySnapshot> customerListener;
-  StreamSubscription<QuerySnapshot> invitationListener;
+  late StreamSubscription<QuerySnapshot?> customerListener;
+  late StreamSubscription<QuerySnapshot?> invitationListener;
 
   @override
   void privilegeChanged() {