Teso_Mobile/lib/Pages/Campaigns.dart

import 'package:flutter/material.dart';
import 'PageWidgets/Campaigns/header.dart';
import 'package:teso/Classes/API Clasess/Campaign.dart';
import 'PageWidgets/Campaigns/campaignTile.dart';
import 'package:flutter/cupertino.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:teso/util/consts.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
import 'dart:async';

class Campaigns extends StatefulWidget {
  @override
  _CampaignsState createState() => _CampaignsState();
}

class _CampaignsState extends State<Campaigns> {
  TextEditingController searchkey;
  List<Campaign> campaignMain;
  List<Campaign> campaign;
  var _future;

  void clearText() {
    setState(() {
      searchkey.clear();
    });
  }

  Future<List<Campaign>> getCampaigns() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();

    Map<String, String> requestHeaders = {
      'Content-type': 'application/json',
      'Authorization': prefs.getString('tokensTeso')
    };

    var register2 = serverLocation + 'adverts/businesscampaigns';
    var client1 = await http.post(Uri.parse(register2),
        body: json.encode(searchkey.text), headers: requestHeaders);

    if (client1.statusCode == 200) {
      var details = jsonDecode(client1.body);
      if (mounted)
        setState(() {
          campaign = List<Campaign>.from(
              details.map((model) => Campaign.fromJSON(model)).toList());
        });
      if (campaignMain == null) {
        setState(() {
          campaignMain = campaign;
        });
      }
    }
    return campaign;
  }

  @override
  void initState() {
    super.initState();
    searchkey = new TextEditingController();
    _future = getCampaigns();
    searchkey.addListener(() async {
      if (searchkey.text.isNotEmpty) {
        getCampaigns();
      } else {
        setState(() {
          campaign = campaignMain;
        });
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.transparent,
        automaticallyImplyLeading: true,
        title: Text("Join a Campaign"),
        centerTitle: true,
      ),
      body: Container(
        // padding: EdgeInsets.only(
        //   left: 10,
        //   right: 10,
        // ),
        child: Column(
          children: [
            buildCampaignHead(context, searchkey, clearText),
            SingleChildScrollView(
              scrollDirection: Axis.vertical,
              child: Container(
                width: MediaQuery.of(context).size.width,
                // height: MediaQuery.of(context).size.height,
                child: FutureBuilder(
                  future: _future,
                  builder: (context, snapshot) {
                    if (snapshot.data == null &&
                        snapshot.connectionState == ConnectionState.waiting) {
                      return Container(
                        child: Center(
                          child: CupertinoActivityIndicator(
                            animating: true,
                            radius: 15,
                          ),
                        ),
                      );
                    } else if (snapshot.data == null &&
                        snapshot.connectionState == ConnectionState.done) {
                      return Container(
                        height: MediaQuery.of(context).size.width,
                        width: MediaQuery.of(context).size.width,
                        child: Center(
                          child: Text(
                              "Sorry there are no open campaigns at the moment"),
                        ),
                      );
                    } else {
                      return ListView.builder(
                        primary: true,
                        scrollDirection: Axis.vertical,
                        shrinkWrap: true,
                        itemCount: campaign.length,
                        itemBuilder: (context, index) {
                          return buildCampaign(
                            context,
                            campaign.elementAt(index),
                          );
                        },
                      );
                    }
                  },
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}