[Projeto] Solução do Desafio

import 'package:flutter/material.dart';
import 'package:nosso_primeiro_projeto/components/task.dart';
import 'package:nosso_primeiro_projeto/data/task_inherited.dart';
import 'package:nosso_primeiro_projeto/screens/form_screen.dart';

class InitialScreen extends StatefulWidget {
  InitialScreen({super.key});

  double nivelGlobal = 0;

  @override
  State<InitialScreen> createState() => _InitialScreenState();
}

class _InitialScreenState extends State<InitialScreen> {
  double calcularNivel() {
    double nivel = 0;
    for (Task task in TaskInherited.of(context)!.taskList) {
      nivel += (task.nivel / 10) * task.dificuldade;
    }
    return widget.nivelGlobal = nivel;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        toolbarHeight: 80,
        title: Column(
          children: [
            const Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Text(
                  'Tarefas',
                  style: TextStyle(color: Colors.white, fontSize: 24),
                ),
              ],
            ),
            Padding(
              padding: const EdgeInsets.only(bottom: 8.0),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.center,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: [
                  SizedBox(
                    width: 250,
                    child: LinearProgressIndicator(
                      value: widget.nivelGlobal / 100,
                      color: Colors.white,
                    ),
                  ),
                  Padding(
                    padding: const EdgeInsets.only(left: 12.0, right: 10.0),
                    child: Row(
                      children: [
                        Text(
                          'Level: ${widget.nivelGlobal.toStringAsFixed(2)}',
                          style: const TextStyle(
                              color: Colors.white, fontSize: 20),
                        ),
                      ],
                    ),
                  ),
                  IconButton(
                    onPressed: () {
                      setState(() {
                        calcularNivel();
                      });
                    },
                    icon: const Icon(
                      Icons.refresh,
                      color: Colors.white,
                      size: 25,
                    ),
                  )
                ],
              ),
            )
          ],
        ),
        centerTitle: true,
        backgroundColor: Colors.blue,
      ),
      body: ListView(
        padding: const EdgeInsets.only(top: 8, bottom: 70),
        children: TaskInherited.of(context)!.taskList,
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          Navigator.push(
            context,
            MaterialPageRoute(
              builder: (contextNew) => FormScreen(
                taskContext: context,
              ),
            ),
          );
        },
        backgroundColor: const Color.fromARGB(255, 13, 102, 175),
        child: const Icon(Icons.add, color: Colors.white),
      ),
    );
  }
}