null safety

lib/pages/receiving/receiving_info.dart

@@ -13,7 +13,7 @@ import 'package:fcs/pages/widgets/progress.dart';
 import 'package:fcs/pages/widgets/status_tree.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter_icons/flutter_icons.dart';
+import 'package:flutter_vector_icons/flutter_vector_icons.dart';
 import 'package:intl/intl.dart';
 import 'package:provider/provider.dart';
 
@@ -22,7 +22,7 @@ import 'receiving_editor.dart';
 final DateFormat dateFormat = DateFormat("d MMM yyyy");
 
 class ReceivingInfo extends StatefulWidget {
-  final Package package;
+  final Package? package;
   ReceivingInfo({this.package});
 
   @override
@@ -30,14 +30,14 @@ class ReceivingInfo extends StatefulWidget {
 }
 
 class _ReceivingInfoState extends State<ReceivingInfo> {
-  Package _package;
+  Package? _package;
   bool _isLoading = false;
   MultiImgController multiImgController = MultiImgController();
 
   @override
   void initState() {
     super.initState();
-    initPackage(widget.package);
+    initPackage(widget.package!);
   }
 
   initPackage(Package package) {
@@ -57,22 +57,22 @@ class _ReceivingInfoState extends State<ReceivingInfo> {
     bool isCustomer = Provider.of<MainModel>(context).isCustomer();
 
     final trackingIdBox = DisplayText(
-      text: _package.trackingID,
+      text: _package!.trackingID,
       labelTextKey: "package.tracking.id",
       iconData: MaterialCommunityIcons.barcode_scan,
     );
     var fcsIDBox = DisplayText(
-      text: _package.fcsID,
+      text: _package!.fcsID,
       labelTextKey: "processing.fcs.id",
       icon: FcsIDIcon(),
     );
     final customerNameBox = DisplayText(
-      text: _package.userName,
+      text: _package!.userName,
       labelTextKey: "package.create.name",
       iconData: Icons.perm_identity,
     );
     final remarkBox = DisplayText(
-      text: _package.remark ?? "-",
+      text: _package!.remark ?? "-",
       labelTextKey: "package.edit.remark",
       iconData: Entypo.new_message,
     );
@@ -123,10 +123,10 @@ class _ReceivingInfoState extends State<ReceivingInfo> {
                   fcsIDBox,
                   customerNameBox,
                   remarkBox,
-                  _package.photoUrls.length == 0 ? Container() : img,
+                  _package!.photoUrls.length == 0 ? Container() : img,
                   StatusTree(
-                      shipmentHistory: _package.shipmentHistory,
-                      currentStatus: _package.status),
+                      shipmentHistory: _package!.shipmentHistory,
+                      currentStatus: _package!.status),
                   SizedBox(
                     height: 20,
                   )
@@ -149,7 +149,7 @@ class _ReceivingInfoState extends State<ReceivingInfo> {
     );
     PackageModel packageModel =
         Provider.of<PackageModel>(context, listen: false);
-    var pkg = await packageModel.getPackage(widget.package.id);
+    var pkg = await packageModel.getPackage(widget.package!.id);
     initPackage(pkg);
   }
 
@@ -164,7 +164,7 @@ class _ReceivingInfoState extends State<ReceivingInfo> {
     try {
       PackageModel packageModel =
           Provider.of<PackageModel>(context, listen: false);
-      await packageModel.deleteReceiving(_package);
+      await packageModel.deleteReceiving(_package!);
       Navigator.pop(context);
     } catch (e) {
       showMsgDialog(context, "Error", e.toString());