doctor_app_flutter/lib/screens/medicine/medicine_search_screen.dart

import 'package:doctor_app_flutter/config/config.dart';
import 'package:doctor_app_flutter/config/size_config.dart';
import 'package:doctor_app_flutter/providers/medicine_provider.dart';
import 'package:doctor_app_flutter/screens/medicine/pharmacies_list_screen.dart';
import 'package:doctor_app_flutter/util/dr_app_shared_pref.dart';
import 'package:doctor_app_flutter/util/dr_app_toast_msg.dart';
import 'package:doctor_app_flutter/util/helpers.dart';
import 'package:doctor_app_flutter/widgets/medicine/medicine_item_widget.dart';
import 'package:doctor_app_flutter/widgets/shared/app_buttons_widget.dart';
import 'package:doctor_app_flutter/widgets/shared/app_scaffold_widget.dart';
import 'package:doctor_app_flutter/widgets/shared/app_text_form_field.dart';
import 'package:doctor_app_flutter/widgets/shared/app_texts_widget.dart';
import 'package:doctor_app_flutter/widgets/shared/dr_app_circular_progress_Indeicator.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../../util/extenstions.dart';

DrAppSharedPreferances sharedPref = DrAppSharedPreferances();

class MedicineSearchScreen extends StatefulWidget with DrAppToastMsg {
  MedicineSearchScreen({this.changeLoadingStata});
  final Function changeLoadingStata;

  @override
  _MedicineSearchState createState() => _MedicineSearchState();
}

class _MedicineSearchState extends State<MedicineSearchScreen> {
  var data;
  final myController = TextEditingController();
  Helpers helpers = new Helpers();

  MedicineProvider _medicineProvider;

  bool _isInit = true;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    if (_isInit) {
      _medicineProvider = Provider.of<MedicineProvider>(context);
    }
    _isInit = false;
  }

  @override
  Widget build(BuildContext context) {
    
    return AppScaffold(
        appBarTitle: "Search Medicine",
        body: Column(
          children: <Widget>[
                Padding(
                  padding: EdgeInsets.only(
                      bottom: SizeConfig.heightMultiplier * 1,
                      right: SizeConfig.heightMultiplier * 2,
                      left: SizeConfig.heightMultiplier * 2,
                      top: SizeConfig.heightMultiplier * 3),
                  child: AppTextFormField(
                      hintText: 'Search Medicine Name Here..',
                      controller: myController,
                      onSaved: (value) {},
                      inputFormatter: ONLY_LETTERS),
                ),
             
            Container(
              margin: EdgeInsets.only(bottom: 5,
              left: 10,
              right: 10,
              top: 0),
              child: Wrap(
                alignment: WrapAlignment.center,
                children: <Widget>[
                  AppButton(
                    title: "Search",
                    color: Color(PRIMARY_COLOR),
                    onPressed: () {
                      searchMedicine(context);
                    },
                  ),
                ],
              ),
            ),
            Container(
              margin: EdgeInsets.only(left: SizeConfig.heightMultiplier * 2),
              child: Row(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: <Widget>[
                  AppText(
                    "You find " + (data == null ? "0": data.length.toString())+" items in search",
                    fontWeight: FontWeight.bold,
                    margin: 5,),
                ],
              ),
            ),
            Expanded(
              child: Container(
                width: SizeConfig.screenWidth * 0.97,
                child: !_medicineProvider.isFinished
                    ? DrAppCircularProgressIndeicator()
                    : _medicineProvider.hasError
                        ? Center(
                            child: Text(
                              _medicineProvider.errorMsg,
                              style: TextStyle(
                                  color: Theme.of(context).errorColor),
                            ),
                          ):ListView.builder(
                  scrollDirection: Axis.vertical,
                  shrinkWrap: true,
                  itemCount: data == null ? 0 : data.length,
                  itemBuilder: (BuildContext context, int index) {
                    
                    return InkWell(
                      child: MedicineItemWidget(
                        label: data[index]["ItemDescription"],
                        url: data[index]["ProductImageBase64"],
                      ),
                      onTap: () {
                        Navigator.push(
                          context,
                          MaterialPageRoute(
                            builder: (context) => ChangeNotifierProvider(
                              create: (_) => MedicineProvider(),
                              child: PharmaciesListScreen(
                                  itemID: data[index]["ItemID"], url: data[index]["ProductImageBase64"]),
                            ),
                          ),
                        );
                      },
                    );
                  },
                ),
              ),
            ),
          ],
        ));
  }

  searchMedicine(context) {
    FocusScope.of(context).unfocus();
    if (myController.text.isNullOrEmpty()) {
      this.setState(() {
        data = null;
      });
      helpers.showErrorToast("Type Medicine Name");
      return;
    }
    _medicineProvider.getMedicineItem(myController.text).then((str) {
      this.setState(() {
        data = _medicineProvider.pharmacyItemsList;
      });
    });
  }
}