Learning Flutter - Alura - First course

editor_component.dart

import 'package:flutter/material.dart';

class Editor extends StatelessWidget {

  final TextEditingController controller;
  final String labelText;
  final String hintText;
  final IconData icon;

  Editor(this.labelText, {this.controller, this.hintText, this.icon});

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(16.0),
      child: TextField(
        controller: this.controller,
        style: TextStyle(
          fontSize: 24.0,
        ),
        decoration: InputDecoration(
          labelText: this.labelText,
          hintText: this.hintText,
          icon: icon != null ? Icon(icon) : null,
        ),
        keyboardType: TextInputType.number,
      ),
    );
  }
}

form.dart

import 'package:flutter/material.dart';
import 'package:flutterapptesting/components/editor_component.dart';
import 'package:flutterapptesting/models/transaction_model.dart';

const _appBarTitle = 'Criando transferência';
const _buttonLabel = 'Confirmar';
const _accountNumberText = 'Número da Conta';
const _accountNumberHint = '0000';
const _valueText = 'Valor';
const _valueHint = '0.0';

class TransactionForm extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return TransactionFormState();
  }
}

class TransactionFormState extends State<TransactionForm> {
  final TextEditingController _accountNumberFieldController =
  TextEditingController();
  final TextEditingController _valueFieldController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(
          _appBarTitle,
        ),
      ),
      body: SingleChildScrollView(
        child: Column(
          children: <Widget>[
            Editor(
              _accountNumberText,
              controller: _accountNumberFieldController,
              hintText: _accountNumberHint,
            ),
            Editor(
              _valueText,
              controller: _valueFieldController,
              hintText: _valueHint,
              icon: Icons.monetization_on,
            ),
            RaisedButton(
              child: Text(_buttonLabel),
              onPressed: () => _createTransaction(context),
            )
          ],
        ),
      ),
    );
  }

  void _createTransaction(context) {
    final int accountNumber = int.tryParse(_accountNumberFieldController.text);
    final double value = double.tryParse(_valueFieldController.text);

    if (value != null && accountNumber != null) {
      Navigator.pop(
        context,
        Transaction(value, accountNumber),
      );
    }
  }
}

list.dart

import 'package:flutter/material.dart';
import 'package:flutterapptesting/models/transaction_model.dart';
import 'package:flutterapptesting/screens/transaction/form.dart';

const _appBarTitle = 'Transferências';

class TransactionList extends StatefulWidget {
  final List<Transaction> _transactions = List();

  @override
  State<StatefulWidget> createState() {
    return TransactionListState();
  }
}

class TransactionListState extends State<TransactionList> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(_appBarTitle),
      ),
      floatingActionButton: FloatingActionButton(
        child: Icon(Icons.add),
        onPressed: () {
          Navigator.push(
            context,
            MaterialPageRoute(
              builder: (context) {
                return TransactionForm();
              },
            ),
          ).then(
            (transactionReceived) => _updateList(transactionReceived),
          );
        },
      ),
      body: ListView.builder(
        itemCount: widget._transactions.length,
        itemBuilder: (context, index) {
          final transaction = widget._transactions[index];
          return TransactionItem(transaction);
        },
      ),
    );
  }

  void _updateList(Transaction t) {
    if (t != null) {
      setState(() {
        widget._transactions.add(t);
      });
    }
  }
}

class TransactionItem extends StatelessWidget {
  final Transaction _transaction;

  TransactionItem(this._transaction);

  @override
  Widget build(BuildContext context) {
    return Card(
      child: ListTile(
        leading: Icon(Icons.monetization_on),
        title: Text(_transaction.value.toString()),
        subtitle: Text(_transaction.accountNumber.toString()),
      ),
    );
  }
}

main.dart

import 'package:flutter/material.dart';
import 'package:flutterapptesting/screens/transaction/list.dart';

void main() => runApp(ByteBankApp());

class ByteBankApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primaryColor: Colors.green[900],
        accentColor: Colors.blueAccent[700],
        buttonTheme: ButtonThemeData(
          buttonColor: Colors.blueAccent[700],
          textTheme: ButtonTextTheme.primary,
        ),
      ),
      home: TransactionList(),
    );
  }
}

transaction_model.dart

class Transaction {

  final double value;
  final int accountNumber;

  Transaction(
    this.value,
    this.accountNumber,
  );

  @override
  String toString() {
    return "valor $value ____  numeroConta $accountNumber";
  }
}