add invoice pdf

lib/pages/invoice/invoice_shipment_list_row.dart

@@ -8,9 +8,12 @@ import 'package:intl/intl.dart';
 import '../main/util.dart';
 import 'invoice_customer_list.dart';
 
+typedef OnSelect(FcsShipment fcsShipment);
+
 class InvoiceShipmentListRow extends StatefulWidget {
+  final OnSelect onSelect;
   final FcsShipment fcsShipment;
-  const InvoiceShipmentListRow({this.fcsShipment});
+  const InvoiceShipmentListRow({this.fcsShipment, this.onSelect});
 
   @override
   _InvoiceShipmentListRowState createState() => _InvoiceShipmentListRowState();
@@ -35,10 +38,7 @@ class _InvoiceShipmentListRowState extends State<InvoiceShipmentListRow> {
       padding: EdgeInsets.only(left: 15, right: 15),
       child: InkWell(
         onTap: () {
-          Navigator.of(context).push(CupertinoPageRoute(
-              builder: (context) => InvoiceCustomerList(
-                    fcsShipment: _fcsShipment,
-                  )));
+          if (widget.onSelect != null) widget.onSelect(widget.fcsShipment);
         },
         child: Row(
           children: <Widget>[