Documentação

lib/screens/hello_splash_screen.dart

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+import 'dart:async';
+
+import 'package:flutter/material.dart';
+
+class HelloSplashScreen extends StatefulWidget {
+  const HelloSplashScreen({super.key, required this.onFinished, this.duration = const Duration(seconds: 5)});
+
+  final Duration duration;
+  final VoidCallback onFinished;
+
+  @override
+  State<HelloSplashScreen> createState() => _HelloSplashScreenState();
+}
+
+class _HelloSplashScreenState extends State<HelloSplashScreen> with SingleTickerProviderStateMixin {
+  late final AnimationController _controller;
+  late final Animation<double> _opacity;
+
+  Timer? _fadeTimer;
+  Timer? _doneTimer;
+
+  @override
+  void initState() {
+    super.initState();
+
+    _controller = AnimationController(
+      vsync: this,
+      duration: const Duration(milliseconds: 500),
+    );
+
+    _opacity = CurvedAnimation(
+      parent: _controller,
+      curve: Curves.easeInOut,
+    );
+
+    _controller.value = 1.0;
+
+    final int fadeMs = (widget.duration.inMilliseconds - 500).clamp(0, widget.duration.inMilliseconds);
+    _fadeTimer = Timer(Duration(milliseconds: fadeMs), () {
+      if (!mounted) return;
+      _controller.reverse();
+    });
+
+    _doneTimer = Timer(widget.duration, () {
+      if (!mounted) return;
+      widget.onFinished();
+    });
+  }
+
+  @override
+  void dispose() {
+    _fadeTimer?.cancel();
+    _doneTimer?.cancel();
+    _controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final Size size = MediaQuery.sizeOf(context);
+
+    return Scaffold(
+      body: FadeTransition(
+        opacity: _opacity,
+        child: Container(
+          width: size.width,
+          height: size.height,
+          color: const Color(0xFFFFC9DF),
+          child: SafeArea(
+            child: Center(
+              child: Column(
+                mainAxisSize: MainAxisSize.min,
+                children: const [
+                  Text(
+                    'Olá',
+                    textAlign: TextAlign.center,
+                    style: TextStyle(
+                      fontSize: 64,
+                      fontWeight: FontWeight.w900,
+                      color: Colors.white,
+                      height: 1.0,
+                    ),
+                  ),
+                ],
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}