import 'package:flutter/material.dart';

class Mainwindow extends StatefulWidget {
  const Mainwindow({super.key});
  @override
  State<StatefulWidget> createState() {
    return MainState();
  }
}

class MainState extends State<Mainwindow>{
  TextEditingController baseController = TextEditingController();
  TextEditingController heightController = TextEditingController();
  TextEditingController areaController = TextEditingController();
  onPressed() {
    setState(() {
      startCalc();
    });
  }
  startCalc() {
    double base = double.parse(baseController.text);
    double height = double.parse(heightController.text);
    double area = calcArea(base, height);
    areaController.text = area.toString();
  }
  calcArea(double base, double height) {
    return base * height / 2;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Háromszög')),
      body: Column(children: [
        const Text('Háromszög területszámítás'),
        const Text('Alap'),
        TextField(controller: baseController),
        const Text('Magasság'),
        TextField(controller: heightController),
        Row(
          children: [
            Expanded(child: 
              ElevatedButton(
                onPressed: onPressed, 
                child: const Text('Számít')
              )
            ),
          ],
        ),
        Text(areaController.text),
        
      ]),
    );
  }
}