loading_overlay 0.4.2

A modal progress indicator widget that fades in and out. Wrap around another widget to block access to widget during an async call.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:loading_overlay/loading_overlay.dart';
import 'dart:async';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'loading_overlay demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: LoginPage(
        onSignIn: () => print('login successful!'),
      ),
    );
  }
}

class LoginPage extends StatefulWidget {
  final VoidCallback onSignIn;

  const LoginPage({super.key, required this.onSignIn});

  @override
  LoginPageState createState() => LoginPageState();
}

class LoginPageState extends State<LoginPage> {
  final TextEditingController _usernameController = TextEditingController();
  final TextEditingController _passwordController = TextEditingController();
  bool _isLoading = false;

  Future<void> signIn() async {
    setState(() {
      _isLoading = true;
    });

    await Future.delayed(const Duration(seconds: 2));

    widget.onSignIn();

    setState(() {
      _isLoading = false;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: LoadingOverlay(
        color: Colors.black.withOpacity(0.5),
        isLoading: _isLoading,
        child: Padding(
          padding: const EdgeInsets.all(16.0),
          child: Column(
            children: [
              TextField(
                controller: _usernameController,
                decoration: const InputDecoration(labelText: 'Username'),
              ),
              TextField(
                controller: _passwordController,
                decoration: const InputDecoration(labelText: 'Password'),
                obscureText: true,
              ),
              ElevatedButton(
                onPressed: signIn,
                child: const Text('Login'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}