Teso_Mobile/lib/Pages/Sub_Pages/LandingPage/SignUp.dart

import 'package:flutter/material.dart';

import 'package:teso/Pages/PageWidgets/Login/signupusername.dart';
import 'package:teso/Pages/Sub_Pages/LandingPage/FinalProcess.dart';
import 'package:teso/providers/pageAnimations.dart';
import 'package:flutter/cupertino.dart';
import 'package:teso/util/consts.dart';
import 'package:teso/Classes/TesoUser.dart';
import 'package:http/http.dart' as http;

class SignUpPage extends StatefulWidget {
  @override
  _SignUpPageState createState() => _SignUpPageState();
}

class _SignUpPageState extends State<SignUpPage> {
  TesoUser newuser = new TesoUser();
  TextEditingController user = new TextEditingController();
  bool loading = false;
  bool taken = false;

  @override
  void dispose() {
    super.dispose();
  }

  @override
  void initState() {
    super.initState();
    user.addListener(() {
      taken = false;
    });
  }

  void startProcessing() async {
    setState(() {
      loading = true;
    });
    var client = await http.get(Uri.parse(
        serverLocation + "api/username/" + user.text.toString().trim()));
    if (client.statusCode == 200) {
      newuser.username = user.text;
      Navigator.push(
        context,
        PageTransition(
            type: PageTransitionType.rightToLeft,
            child: FinalProcess(
              newuser: this.newuser,
            )),
      );
      setState(() {
        loading = false;
      });
    } else {
      setState(() {
        loading = false;
        taken = true;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      margin: EdgeInsets.only(
        top: MediaQuery.of(context).size.height * 0.05,
      ),
      height: MediaQuery.of(context).size.height * 0.9,
      child: SingleChildScrollView(
        scrollDirection: Axis.vertical,
        child: new Column(
          children: <Widget>[
            new Container(
              // color: Colors.white,
              margin: EdgeInsets.only(
                left: 20.0,
                top: 20.0,
                bottom: 12.0,
              ),
              child: Row(
                children: [
                  Container(
                    child: InkWell(
                      onTap: () => Navigator.pop(context),
                      child: Icon(Icons.close),
                    ),
                  ),
                  Expanded(
                    child: Container(
                      width: double.infinity,
                      child: Center(
                        child: Text(
                          "Create username",
                          style: TextStyle(
                            fontSize: 20.0,
                            color: Colors.black,
                          ),
                        ),
                      ),
                    ),
                  ),
                ],
              ),
            ),
            Padding(
              padding: const EdgeInsets.all(8.0),
              child: Divider(
                thickness: 0.8,
              ),
            ),
            Container(
              width: double.infinity,
              margin: EdgeInsets.only(
                bottom: MediaQuery.of(context).size.height * 0.02,
              ),
              child: Center(
                child: Text(
                  "Choose a username for your new account. You can always change it later.",
                  textAlign: TextAlign.center,
                  style: TextStyle(
                    color: Colors.grey,
                  ),
                ),
              ),
            ),
            SizedBox(
              height: 20,
            ),
            usersignup(context, user),
            Visibility(
              visible: loading,
              child:
                  SizedBox(height: MediaQuery.of(context).size.height * 0.025),
            ),
            Visibility(
              visible: loading,
              child: Center(
                child: CupertinoActivityIndicator(
                  animating: true,
                  radius: 15,
                ),
              ),
            ),
            Visibility(
              visible: taken,
              child: Container(
                margin: EdgeInsets.only(top: 20),
                width: MediaQuery.of(context).size.width * 0.6,
                // height: 40.0,
                child: Center(
                  child: Text(
                    "Username has already been taken...",
                    style: TextStyle(
                      color: Colors.red,
                    ),
                  ),
                ),
              ),
            ),
            SizedBox(height: MediaQuery.of(context).size.height * 0.001),
            Container(
              margin: EdgeInsets.only(top: 20),
              width: MediaQuery.of(context).size.width * 0.6,
              height: 40.0,
              decoration: BoxDecoration(
                  gradient: LinearGradient(
                    begin: Alignment.topCenter,
                    end: Alignment.bottomCenter,
                    colors: [
                      accentMain,
                      darkAccent,
                    ],
                    // stops: [0.1, 0.4, 0.7, 0.8],
                  ),
                  boxShadow: [
                    BoxShadow(
                      color: Colors.grey[500],
                      offset: Offset(0.0, 1.5),
                      blurRadius: 1.5,
                    ),
                  ]),
              child: Material(
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.all(
                    Radius.circular(25.0),
                  ),
                ),
                color: Colors.transparent,
                child: InkWell(
                    onTap: startProcessing,
                    child: Center(
                      child: Text(
                        "NEXT",
                        style: TextStyle(
                          fontSize: 18,
                          color: Colors.white,
                        ),
                      ),
                    )),
              ),
            ),
          ],
        ),
      ),
    );
  }
}