null safety

lib/pages/invoice/invoice_info.dart

@@ -20,8 +20,8 @@ import 'package:intl/intl.dart';
 import 'package:provider/provider.dart';
 
 class InvoiceInfo extends StatefulWidget {
-  final Invoice invoice;
-  final bool forCustomer;
+  final Invoice? invoice;
+  final bool? forCustomer;
   InvoiceInfo({this.invoice, this.forCustomer});
 
   @override
@@ -31,15 +31,15 @@ class InvoiceInfo extends StatefulWidget {
 class _InvoiceInfoState extends State<InvoiceInfo> {
   var dateFormatter = new DateFormat('dd MMM yyyy');
 
-  Invoice _invoice;
+  Invoice? _invoice;
   bool _isLoading = false;
 
   bool _showCartons = false;
   @override
   void initState() {
     super.initState();
-    _invoice = widget.invoice;
-    _invoice.shipments?.forEach((s) {
+    _invoice = widget.invoice!;
+    _invoice!.shipments.forEach((s) {
       s.isSelected = true;
     });
     _loadCartons();
@@ -54,7 +54,7 @@ class _InvoiceInfoState extends State<InvoiceInfo> {
       cartons.add(_carton);
     }
     setState(() {
-      _invoice.cartons = cartons;
+      _invoice!.cartons = cartons;
     });
   }
 
@@ -65,31 +65,31 @@ class _InvoiceInfoState extends State<InvoiceInfo> {
 
   @override
   Widget build(BuildContext context) {
-    bool isCanceled = _invoice.status == invoice_cancel_status;
-    bool isPaid = _invoice.status == invoice_paid_status;
+    bool isCanceled = _invoice!.status == invoice_cancel_status;
+    bool isPaid = _invoice!.status == invoice_paid_status;
     var rateModel = Provider.of<ShipmentRateModel>(context);
     var rate = rateModel.rate;
 
     final cartonTable = InvoiceCartonTable(
-      cartons: _invoice.cartons,
+      cartons: _invoice!.cartons,
       rate: rate,
     );
 
     final invoiceTableBox = InvoiceTable(
-      invoice: _invoice,
+      invoice: _invoice!,
       rate: rate,
       deliveryFeeSelected: (selected) {
         setState(() {
           if (selected) {
-            _invoice.deliveryFee = rate.deliveryFee;
+            _invoice!.deliveryFee = rate.deliveryFee;
           } else {
-            _invoice.deliveryFee = 0;
+            _invoice!.deliveryFee = 0;
           }
         });
       },
       discountSelected: (discount) {
         setState(() {
-          _invoice.discount = discount;
+          _invoice!.discount = discount;
         });
       },
     );
@@ -118,7 +118,7 @@ class _InvoiceInfoState extends State<InvoiceInfo> {
         Column(
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            Text(dateFormatter.format(_invoice.invoiceDate)),
+            Text(dateFormatter.format(_invoice!.invoiceDate)),
             SizedBox(
               height: 5,
             ),
@@ -140,7 +140,7 @@ class _InvoiceInfoState extends State<InvoiceInfo> {
     );
     final paymentMethodBox = DisplayText(
       labelTextKey: "invoice.payment_method",
-      text: _invoice.paymentMethod.name,
+      text: _invoice!.paymentMethod.name,
     );
 
     final cancelBtn = LocalButton(
@@ -166,7 +166,7 @@ class _InvoiceInfoState extends State<InvoiceInfo> {
           padding: const EdgeInsets.all(8.0),
           child: ListView(
             children: <Widget>[
-              getInvoiceStatus(context, _invoice),
+              getInvoiceStatus(context, _invoice!),
               headerBox,
               _showCartons ? cartonTable : Container(),
               _showCartons
@@ -183,7 +183,7 @@ class _InvoiceInfoState extends State<InvoiceInfo> {
               SizedBox(
                 height: 10,
               ),
-              isCanceled || isPaid || widget.forCustomer
+              isCanceled || isPaid || widget.forCustomer!
                   ? Container()
                   : cancelBtn,
             ],
@@ -206,7 +206,7 @@ class _InvoiceInfoState extends State<InvoiceInfo> {
       InvoiceModel invoiceModel =
           Provider.of<InvoiceModel>(context, listen: false);
 
-      await invoiceModel.cancelInvoice(_invoice);
+      await invoiceModel.cancelInvoice(_invoice!);
       Navigator.pop(context, true);
     } catch (e) {
       showMsgDialog(context, "Error", e.toString());