fcs/lib/pages/do/do_storage_item.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:fcs/model/storage_model.dart';
import 'package:fcs/theme/theme.dart';
import 'package:fcs/util.dart';
import 'package:fcs/vo/do.dart';
import 'package:fcs/vo/storage.dart';
import 'package:fcs/widget/local_text.dart';
import 'package:fcs/widget/my_data_table.dart';
import 'package:fcs/widget/number_cell.dart';
import 'package:fcs/widget/progress.dart';

typedef OnSave = void Function(String storageID, String storageName);

class DOStorageItem extends StatefulWidget {
  final DOLine doLine;
  final OnSave onSave;
  const DOStorageItem({Key key, this.doLine, this.onSave}) : super(key: key);
  @override
  _DOStorageItemState createState() => _DOStorageItemState();
}

class _DOStorageItemState extends State<DOStorageItem> {
  final _formKey = GlobalKey<FormState>();
  bool _isLoading = false;
  String currentStorageID;
  TextEditingController _product = new TextEditingController();
  TextEditingController _quantity = new TextEditingController();
  DOLine doLine = DOLine();

  @override
  void initState() {
    super.initState();
    this.doLine = widget.doLine;

    if (doLine.storageID != null && doLine.storageID.isNotEmpty) {
      this.currentStorageID = doLine.storageID;
    }
    _product.text = this.doLine.productName;
    _quantity.text = this.doLine.qty.toString();
  }

  Widget showStorages(BuildContext context, StorageModel storageModel) {
    return Container(
      padding: EdgeInsets.only(top: 10),
      child: Row(
        mainAxisSize: MainAxisSize.max,
        children: <Widget>[
          Image.asset(
            "assets/inventory.png",
            width: 30,
            height: 30,
            color: primaryColor,
          ),
          SizedBox(
            width: 20,
          ),
          new Flexible(
            child: Container(
              width: 170.0,
              child: DropdownButton<String>(
                value: currentStorageID,
                isExpanded: true,
                hint: Text(
                  'Select Storage',
                  style: labelStyle,
                ),
                onChanged: changedStorage,
                items: storageModel
                    .getStorage(doLine.productID)
                    .map<DropdownMenuItem<String>>((Storage storage) {
                  return new DropdownMenuItem<String>(
                    value: storage.id,
                    child: new Text(storage.name, style: textStyle),
                  );
                }).toList(),
              ),
            ),
          ),
        ],
      ),
    );
  }

  void changedStorage(selected) {
    setState(() {
      currentStorageID = selected;
    });
  }

  Widget showStorgeTable(BuildContext context, StorageModel storageModel) {
    return Container(
      child: SingleChildScrollView(
        scrollDirection: Axis.horizontal,
        child: MyDataTable(
          headingRowHeight: 40,
          columnSpacing: 100,
          columns: [
            MyDataColumn(
              label: LocalText(context, "storge"),
            ),
            MyDataColumn(
              label: LocalText(context, "storage.product.qty"),
            ),
          ],
          rows: getProductRow(storageModel.getStorage(doLine.productID)),
        ),
      ),
    );
  }

  List<MyDataRow> getProductRow(List<Storage> storages) {
    return storages.map((s) {
      return MyDataRow(
        onSelectChanged: (bool selected) {
          setState(() {
            currentStorageID = s.id;
          });
        },
        cells: [
          MyDataCell(
            new Text(s.name, style: textStyle),
          ),
          MyDataCell(
            NumberCell(s.products
                .firstWhere((p) => p.id == doLine.productID)
                .quantity),
          ),
        ],
      );
    }).toList();
  }

  @override
  Widget build(BuildContext context) {
    var storgeModel = Provider.of<StorageModel>(context);

    final productbox = Container(
        padding: EdgeInsets.only(top: 10),
        child: Row(
          children: <Widget>[
            LocalText(context, "do.product"),
            SizedBox(
              width: 20,
            ),
            Text(_product.text, style: textStyle)
          ],
        ));

    final quantitybox = Container(
      padding: EdgeInsets.only(top: 15),
      child: Row(
        children: <Widget>[
          LocalText(context, "do.quantity"),
          SizedBox(
            width: 20,
          ),
          Text(formatNumber(this.doLine.qty), style: textStyle)
        ],
      ),
    );

    return LocalProgress(
      inAsyncCall: _isLoading,
      child: Scaffold(
          appBar: AppBar(
            backgroundColor: primaryColor,
            title: Text("DO"),
            actions: <Widget>[
              IconButton(
                icon: Icon(Icons.save),
                onPressed: () {
                  _save();
                },
              )
            ],
          ),
          body: Form(
            key: _formKey,
            child: Column(
              children: <Widget>[
                Expanded(
                  child: ListView(
                    shrinkWrap: true,
                    padding: EdgeInsets.only(left: 24.0, right: 24.0, top: 10),
                    children: <Widget>[
                      productbox,
                      quantitybox,
                      showStorages(context, storgeModel),
                      showStorgeTable(context, storgeModel)
                    ],
                  ),
                ),
              ],
            ),
          )),
    );
  }

  _save() {
    this.doLine.storageID = currentStorageID;
    var storageName =
        Provider.of<StorageModel>(context).getStorageName(currentStorageID);
    this.doLine.storageName = storageName;
    if (widget.onSave != null)
      widget.onSave(this.doLine.storageID, storageName);
    Navigator.pop<DOLine>(context, this.doLine);
  }
}