Search

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';

class Search extends StatefulWidget {
  @override
  _SearchState createState() => _SearchState();
}

class _SearchState extends State<Search> {
  var queryResultSet = [];
  var tempSearchStore = [];

  initiateSearch(value) {
    if (value.length == 0) {
      setState(() {
        tempSearchStore = []; //comment this if you want to always show.
      });
    }

    var capitalizedValue =
        value.substring(0, 1).toUpperCase() + value.substring(1);

    tempSearchStore = [];
    queryResultSet.forEach((element) {
      if (element['searchKey'].startsWith(capitalizedValue)) {
        setState(() {
          tempSearchStore.add(element);
        });
      }
    });
  }

  _getSnapShots() {
    SearchService().searchByName().map((snapshot) {
      snapshot.then((QuerySnapshot docs) {
        for (int i = 0; i < docs.docs.length; ++i) {
          queryResultSet.add(docs.docs[i].data);
        }
      });
    }).toList();
  }

  @override
  void initState() {
    _getSnapShots();
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
        appBar: AppBar(
          title: TextField(
            autofocus: true,
            decoration: InputDecoration(
                border: InputBorder.none,
                hintText: "Search",
                hintStyle: TextStyle(
                    color: Colors.black, fontWeight: FontWeight.bold)),
            onChanged: (val) {
              initiateSearch(val.toUpperCase());
            },
          ),
        ),
        body: ListView(children: <Widget>[
          SizedBox(height: 10.0),
          GridView.count(
              padding: EdgeInsets.only(left: 10.0, right: 10.0),
              crossAxisCount: 2,
              crossAxisSpacing: 4.0,
              mainAxisSpacing: 4.0,
              primary: false,
              shrinkWrap: true,
              children: tempSearchStore.map((element) {
                return buildResultCard(element);
              }).toList())
        ]));
  }
}

Widget buildResultCard(data) {
  return Card(
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10.0)),
      elevation: 2.0,
      child: Container(
          child: Center(
              child: Text(
        data['Adı'],
        textAlign: TextAlign.center,
        style: TextStyle(
          color: Colors.black,
          fontSize: 20.0,
        ),
      ))));
}

class SearchService {
  List<Future<QuerySnapshot>> searchByName() {
    return [
      FirebaseFirestore.instance.collection('User').where('searchKey').get(),
      FirebaseFirestore.instance.collection('User').where('searchKey').get(),
    ];
  }
}