fcs/lib/pages/my_registeration_item.dart

import 'package:flutter/material.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'package:provider/provider.dart';
import 'package:fcs/model/product_model.dart';
import 'package:fcs/fcs/common/theme.dart';
import 'package:fcs/vo/buyer.dart';
import 'package:fcs/vo/product.dart';
import 'package:fcs/widget/progress.dart';

class MyRegisterationItem extends StatefulWidget {
  final BuyerProduct buyerProduct;
  const MyRegisterationItem({Key key, this.buyerProduct}) : super(key: key);
  @override
  _MyRegisterationItemState createState() => _MyRegisterationItemState();
}

class _MyRegisterationItemState extends State<MyRegisterationItem> {
  final _formKey = GlobalKey<FormState>();
  bool _isLoading = false;
  TextEditingController _storage = new TextEditingController();
  TextEditingController _sales = new TextEditingController();
  String currentProductID;
  BuyerProduct buyerProduct = BuyerProduct(action: "create");

  @override
  void initState() {
    super.initState();
    if (widget.buyerProduct != null) {
      buyerProduct = widget.buyerProduct;
      buyerProduct.action = "update";
      currentProductID = buyerProduct.productID;
      _sales.text = buyerProduct.dailySaleQty.toString();
      _storage.text = buyerProduct.storageCapacityQty.toString();
    }
  }

  Widget showProducts(BuildContext context, ProductModel productModel) {
    return Row(
      mainAxisSize: MainAxisSize.max,
      children: <Widget>[
        Icon(
          FontAwesomeIcons.tag,
          color: primaryColor,
          size: 20,
        ),
        SizedBox(
          width: 20,
        ),
        new Flexible(
          child: Container(
            width: 170.0,
            child: DropdownButton<String>(
              value: currentProductID,
              isExpanded: true,
              hint: Text(
                'Select Product',
                style: labelStyle,
              ),
              onChanged: changedProduct,
              items: productModel.products
                  .map<DropdownMenuItem<String>>((Product product) {
                return new DropdownMenuItem<String>(
                  value: product.id,
                  child: new Text(product.name, style: textStyle),
                );
              }).toList(),
            ),
          ),
        ),
      ],
    );
  }

  void changedProduct(selected) {
    setState(() {
      currentProductID = selected;
    });
  }

  @override
  Widget build(BuildContext context) {
    ProductModel productModel = Provider.of<ProductModel>(context);

    final volumeBox = Container(
      padding: EdgeInsets.only(top: 10),
      child: TextFormField(
        controller: _storage,
        autofocus: false,
        cursorColor: primaryColor,
        keyboardType: TextInputType.number,
        decoration: new InputDecoration(
          labelText: "Enter total storage capacity",
          labelStyle: labelStyle,
          icon: Image.asset(
            "assets/volume.png",
            width: 23,
            color: primaryColor,
          ),
          enabledBorder: UnderlineInputBorder(
              borderSide: BorderSide(color: primaryColor, width: 1.0)),
          focusedBorder: UnderlineInputBorder(
              borderSide: BorderSide(color: primaryColor, width: 1.0)),
        ),
        validator: (value) {
          if (value.isEmpty) {
            return "Please total storage capacity";
          }
          return null;
        },
      ),
    );
    final amountBox = Container(
      child: TextFormField(
        controller: _sales,
        autofocus: false,
        cursorColor: primaryColor,
        keyboardType: TextInputType.number,
        decoration: new InputDecoration(
          labelText: "Enter daily sale quantity",
          labelStyle: labelStyle,
          icon: Image.asset(
            "assets/sales.png",
            width: 23,
            color: primaryColor,
          ),
          enabledBorder: UnderlineInputBorder(
              borderSide: BorderSide(color: primaryColor, width: 1.0)),
          focusedBorder: UnderlineInputBorder(
              borderSide: BorderSide(color: primaryColor, width: 1.0)),
        ),
        validator: (value) {
          if (value.isEmpty) {
            return "Please enter daily sale quantity";
          }
          return null;
        },
      ),
    );

    return LocalProgress(
      inAsyncCall: _isLoading,
      child: Scaffold(
          appBar: AppBar(
            backgroundColor: primaryColor,
            title: Text("Product registration"),
            actions: <Widget>[
              IconButton(
                icon: Icon(Icons.delete),
                onPressed: () {
                  buyerProduct.action = "delete";
                  Navigator.pop(context, buyerProduct);
                },
              ),
              IconButton(
                icon: Icon(Icons.save),
                onPressed: () {
                  if (!_formKey.currentState.validate()) return;
                  _save();
                },
              )
            ],
          ),
          body: Form(
            key: _formKey,
            child: Column(
              children: <Widget>[
                Expanded(
                  child: ListView(
                    shrinkWrap: true,
                    padding: EdgeInsets.only(left: 24.0, right: 24.0),
                    children: <Widget>[
                      showProducts(context, productModel),
                      volumeBox,
                      amountBox,
                    ],
                  ),
                ),
              ],
            ),
          )),
    );
  }

  _save() {
    if (currentProductID == null) return;
    this.buyerProduct.productID = currentProductID;
    var productName =
        Provider.of<ProductModel>(context).getProductName(currentProductID);
    this.buyerProduct.productName = productName;
    this.buyerProduct.storageCapacityQty = int.parse(_storage.text);
    this.buyerProduct.dailySaleQty = int.parse(_sales.text);
    Navigator.pop<BuyerProduct>(context, this.buyerProduct);
  }
}