Loading, error and empty states in Flutter: solved exercise

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52

import 'package:flutter/material.dart';

void main() {
  runApp(const MaterialApp(home: ExercisePage()));
}

class ExercisePage extends StatefulWidget {
  const ExercisePage({super.key});

  @override
  State<ExercisePage> createState() => _ExercisePageState();
}

class _ExercisePageState extends State<ExercisePage> {
  bool loading = false;
  String message = 'Initial state';

  Future<void> runExercise() async {
    setState(() {
      loading = true;
      message = 'Processing...';
    });

    await Future<void>.delayed(const Duration(milliseconds: 700));

    if (!mounted) return;
    setState(() {
      loading = false;
      message = 'Exercise completed';
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Flutter solved exercise')),
      body: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Text(message),
            const SizedBox(height: 12),
            ElevatedButton(
              onPressed: loading ? null : runExercise,
              child: Text(loading ? 'Loading...' : 'Run'),
            ),
          ],
        ),
      ),
    );
  }
}