merge

lib/app.dart

@@ -22,6 +22,7 @@ import 'model/chart_model.dart';
 import 'model/device_model.dart';
 import 'model/do_model.dart';
 import 'model/employee_model.dart';
+import 'model/invoice_model.dart';
 import 'model/language_model.dart';
 import 'model/log_model.dart';
 import 'model/main_model.dart';
@@ -70,7 +71,7 @@ class _AppState extends State<App> {
   final ShipmentModel shipmentModel = new ShipmentModel();
   final PackageModel packageModel=new PackageModel();
   final MessageModel messageModel=new MessageModel();
-
+  final InvoiceModel invoiceModel = new InvoiceModel();
 
   AppTranslationsDelegate _newLocaleDelegate;
 
@@ -106,7 +107,8 @@ class _AppState extends State<App> {
       ..addModel(shipmentModel)
       ..addModel(packageModel)
       ..addModel(messageModel)
-      ..addModel(shipmentRateModel);
+      ..addModel(shipmentRateModel)
+      ..addModel(invoiceModel);
     this.mainModel.init();
   }
 
@@ -160,6 +162,7 @@ class _AppState extends State<App> {
         ChangeNotifierProvider(builder: (context) => shipmentModel),
         ChangeNotifierProvider(builder: (context) => packageModel),
         ChangeNotifierProvider(builder: (context) => messageModel),
+        ChangeNotifierProvider(builder: (context) => invoiceModel),
         ChangeNotifierProvider(
           builder: (context) => testModel,
         ),