update rate

lib/pages/discount_by_weight_editor.dart

@@ -0,0 +1,81 @@
+import 'package:fcs/pages/util.dart';
+import 'package:fcs/vo/custom.dart';
+import 'package:fcs/vo/discount.dart';
+import 'package:fcs/widget/localization/app_translations.dart';
+import 'package:flutter/material.dart';
+import 'package:fcs/widget/progress.dart';
+import 'package:font_awesome_flutter/font_awesome_flutter.dart';
+import '../theme/theme.dart';
+
+class DiscountByWeightEditor extends StatefulWidget {
+  final Discount discount;
+  DiscountByWeightEditor({this.discount});
+
+  @override
+  _DiscountByWeightEditorState createState() => _DiscountByWeightEditorState();
+}
+
+class _DiscountByWeightEditorState extends State<DiscountByWeightEditor> {
+  TextEditingController _weightController = new TextEditingController();
+  TextEditingController _rateController = new TextEditingController();
+
+  bool _isLoading = false;
+  Discount _discount = new Discount();
+
+  @override
+  void initState() {
+    super.initState();
+    if (widget.discount != null) {
+      _discount = widget.discount;
+      _weightController.text = _discount.weight.toString();
+      _rateController.text = _discount.discountRate.toString();
+    }
+  }
+
+  @override
+  void dispose() {
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return LocalProgress(
+      inAsyncCall: _isLoading,
+      child: Scaffold(
+        appBar: AppBar(
+          centerTitle: true,
+          leading: new IconButton(
+            icon: new Icon(
+              Icons.close,
+            ),
+            onPressed: () => Navigator.of(context).pop(),
+          ),
+          backgroundColor: primaryColor,
+          title: Text(AppTranslations.of(context).text("discount.new")),
+        ),
+        body: Container(
+          padding: EdgeInsets.all(18),
+          child: Column(
+            children: <Widget>[
+              Expanded(
+                child: ListView(
+                  children: <Widget>[
+                    fcsInput("Weight", FontAwesomeIcons.weightHanging,
+                        controller: _weightController),
+                    fcsInput("Discount Rate", Icons.attach_money,
+                        controller: _rateController),
+                    SizedBox(height: 30),
+                  ],
+                ),
+              ),
+              widget.discount == null
+                  ? fcsButton(context, "Create", callack: () {})
+                  : fcsButton(context, "Save", callack: () {}),
+              SizedBox(height: 10)
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}