PhysiGo/app/lib/SignupPage.dart

import 'package:flutter/material.dart';

class SignupPage extends StatefulWidget {
  const SignupPage({Key? key}) : super(key: key);

  @override
  State<SignupPage> createState() => _SignupPageState();
}

class _SignupPageState extends State<SignupPage> {
  int _pageIndex = 0;
  List<Widget> forms = [SignupForm1(title: '',), SignupForm2(title: '',), SignupForm3(title: '',)];

  void _updatePageIndex(int newPageIndex) {
    if(newPageIndex == -1) {
      Navigator.pushNamed(context, '/');
    } else if (newPageIndex == 3) {
      //autentification
      newPageIndex = 2;
    } else {
      setState(() {
        _pageIndex = newPageIndex;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      floatingActionButton: Row(
        mainAxisAlignment: MainAxisAlignment.end,
        children: [
          FloatingActionButton(child: Icon(Icons.navigate_before_outlined),
              onPressed: () => _updatePageIndex(_pageIndex - 1)
          ),
          SizedBox(
            width: 25,
          ),

          FloatingActionButton(child: Icon(Icons.navigate_next_outlined),
              onPressed: () => _updatePageIndex(_pageIndex +1 ))
        ],
      ),
      body: Center(child: forms[_pageIndex]),
    );
  }
}

class SignupForm1 extends StatefulWidget {
  const SignupForm1({Key? key, required this.title}) : super(key: key);
  final String title;

  @override
  //_RegisterScreen createState() => _RegisterScreen();
  State<SignupForm1> createState() => _SignupForm1();
}

class _SignupForm1 extends State<SignupForm1> {
  DateTime? _dateTime;
  String? _dateString;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Register Screen'),
      ),
      body: Center(
          child: SizedBox(
            width: 300,
            child: Column(children: <Widget>[
              const SizedBox(height: 30),
              Text(
                'Personal Information',
                style: TextStyle(fontSize: 25, fontWeight: FontWeight.bold),
              ),
              const SizedBox(height: 30),
              Image.asset(
                'assets/user.png',
                width: 150,
              ),
              const SizedBox(height: 30),
              TextField(
                decoration: InputDecoration(
                  hintText: 'Name',
                ),
              ),
              const SizedBox(height: 10),
              TextField(
                decoration: InputDecoration(
                  hintText: 'Surname',
                ),
              ),

              const SizedBox(height: 10),
              Row(children: <Widget>[
                Text(_dateString == null
                    ? 'Select birthday date :'
                    : _dateString.toString()),
                const SizedBox(width: 49),
                ElevatedButton(
                  onPressed: () {
                    showDatePicker(
                        context: context,
                        initialDate: DateTime.now(),
                        firstDate: DateTime(1900),
                        lastDate: DateTime(2222))
                        .then((date) {
                      setState(() {
                        _dateTime = date!;
                        _dateString = "${date.day}/${date.month}/${date.year}";
                      });
                    });
                  },
                  child: const Text('Select date'),
                ),
              ]),
              const SizedBox(height: 10),

            ]),
          )),
    );
  }
}

class SignupForm2 extends StatefulWidget {
  const SignupForm2({Key? key, required this.title}) : super(key: key);
  final String title;

  @override
  //_RegisterScreen createState() => _RegisterScreen();
  State<SignupForm2> createState() => _SignupForm2();
}

class _SignupForm2 extends State<SignupForm2> {
  bool isChecked = false;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Register Screen'),
      ),
      body: Center(
          child: SizedBox(
            width: 300,
            child: Column(children: <Widget>[
              const SizedBox(height: 30),
              Text(
                'Contact Details',
                style: TextStyle(fontSize: 25, fontWeight: FontWeight.bold),
              ),
              const SizedBox(height: 30),
              Image.asset(
                'assets/communicate.png',
                width: 150,
              ),
              const SizedBox(height: 30),
              TextField(
                decoration: InputDecoration(
                  hintText: 'Mail',
                ),
              ),
              const SizedBox(height: 10),
              TextField(
                decoration: InputDecoration(
                  hintText: 'Phone Number',
                ),
              ),
              const SizedBox(height: 10),
              TextField(
                decoration: InputDecoration(
                  hintText: 'Home Adress..',
                ),
              ),
              const SizedBox(height: 10),
              Row(children: <Widget>[
                Text('Anonymous'),
                Checkbox(

                  checkColor: Colors.white,
                  value: isChecked,
                  onChanged: (bool? value) {
                    setState(() {
                      isChecked = value!;
                    });
                  },),
              ]),

              const SizedBox(height: 10),


            ]),
          )),
    );
  }

}

class SignupForm3 extends StatefulWidget {
  const SignupForm3({Key? key, required this.title}) : super(key: key);
  final String title;

  @override
  //_RegisterScreen createState() => _RegisterScreen();
  State<SignupForm3> createState() => _SignupForm3();
}

class _SignupForm3 extends State<SignupForm3> {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Register Screen'),
      ),
      body: Center(
          child: SizedBox(
            width: 300,
            child: Column(children: <Widget>[
              const SizedBox(height: 30),
              Text(
                'User details',
                style: TextStyle(fontSize: 25, fontWeight: FontWeight.bold),
              ),
              const SizedBox(height: 30),
              Image.asset(
                'assets/id-card.png',
                width: 150,
              ),
              const SizedBox(height: 30),
              TextField(
                decoration: InputDecoration(
                  hintText: 'Username',
                ),
              ),
              const SizedBox(height: 10),
              TextField(
                decoration: InputDecoration(
                  hintText: 'Password',
                ),
              ),
              const SizedBox(height: 10),
              TextField(
                decoration: InputDecoration(
                  hintText: 'Repeat password',
                ),
              ),
              const SizedBox(height: 10),

            ]),
          )),
    );
  }

}