fix carton

lib/pages/carton/package_carton_editor.dart

@@ -138,9 +138,10 @@ class _PackageCartonEditorState extends State<PackageCartonEditor> {
                 context,
                 CupertinoPageRoute(builder: (context) => CargoTypeAddition()));
             if (cargos == null) return;
+            if (cargos == null) return;
             setState(() {
-              _cargoTypes.clear();
-              _cargoTypes.addAll(cargos);
+              _cargoTypes.addAll(
+                  cargos.where((e) => !_cargoTypes.contains(e)).toList());
             });
           }),
     );
@@ -148,8 +149,8 @@ class _PackageCartonEditorState extends State<PackageCartonEditor> {
     final cargoTableBox = CargoTable(
       isNew: widget.isNew,
       cargoTypes: _cargoTypes,
-      onAdd: (c) => _addCargo(c),
       onRemove: (c) => _removeCargo(c),
+      onUpdate: (c) => _updateCargo(c),
     );
 
     return LocalProgress(
@@ -286,20 +287,23 @@ class _PackageCartonEditorState extends State<PackageCartonEditor> {
     );
   }
 
-  _addCargo(CargoType cargo) {
-    if (cargo == null) return;
-    setState(() {
-      _cargoTypes.remove(cargo);
-      _cargoTypes.add(cargo);
-    });
-  }
-
   _removeCargo(CargoType cargo) {
     setState(() {
       _cargoTypes.remove(cargo);
     });
   }
 
+  _updateCargo(CargoType cargo) {
+    setState(() {
+      var _c =
+          _cargoTypes.firstWhere((e) => e.id == cargo.id, orElse: () => null);
+      if (_c != null) {
+        _c.weight = cargo.weight;
+        _c.qty = cargo.qty;
+      }
+    });
+  }
+
   _creatCarton() async {
     if ((_cargoTypes?.length ?? 0) == 0) {
       showMsgDialog(context, "Error", "Expect at least one cargo type");