proxybuy-flutter/lib/widgets/animated_splash_screen.dart

import 'dart:math';
import 'package:flutter/material.dart';
import 'package:flutter_svg/flutter_svg.dart';
import '../gen/assets.gen.dart';

class CoolSplashScreen extends StatefulWidget {
  final Widget nextScreen;
  final Duration duration;

  const CoolSplashScreen({
    super.key,
    required this.nextScreen,
    this.duration = const Duration(seconds: 6),
  });

  @override
  State<CoolSplashScreen> createState() => _CoolSplashScreenState();
}

class _CoolSplashScreenState extends State<CoolSplashScreen>
    with TickerProviderStateMixin {
  late AnimationController _mainController;
  late Animation<double> _backgroundAnimation;
  late Animation<double> _particlesAnimation;
  late Animation<double> _logoAnimation;
  late Animation<double> _textAnimation;

  @override
  void initState() {
    super.initState();

    _mainController = AnimationController(
      duration: const Duration(milliseconds: 4000), 
      vsync: this,
    );

    _backgroundAnimation = Tween<double>(begin: 0.0, end: 1.0).animate(
      CurvedAnimation(
        parent: _mainController,
        curve: const Interval(0.0, 0.5, curve: Curves.easeInOut),
      ),
    );

    _particlesAnimation = Tween<double>(begin: 0.0, end: 1.0).animate(
      CurvedAnimation(
        parent: _mainController,
        curve: const Interval(0.2, 0.7, curve: Curves.easeOut),
      ),
    );

    _logoAnimation = Tween<double>(begin: 0.0, end: 1.0).animate(
      CurvedAnimation(
        parent: _mainController,
        curve: const Interval(0.5, 0.9, curve: Curves.elasticOut),
      ),
    );

    _textAnimation = Tween<double>(begin: 0.0, end: 1.0).animate(
      CurvedAnimation(
        parent: _mainController,
        curve: const Interval(0.7, 1.0, curve: Curves.easeOut),
      ),
    );

    _mainController.forward();

    Future.delayed(widget.duration, () {
      if (mounted) {
        Navigator.of(context).pushReplacement(
          PageRouteBuilder(
            pageBuilder: (_, __, ___) => widget.nextScreen,
            transitionDuration: const Duration(milliseconds: 700),
            transitionsBuilder: (_, animation, __, child) {
              return FadeTransition(opacity: animation, child: child);
            },
          ),
        );
      }
    });
  }

  @override
  void dispose() {
    _mainController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: AnimatedBuilder(
        animation: _mainController,
        builder: (context, child) {
          return Container(
            decoration: BoxDecoration(
              gradient: LinearGradient(
                begin: Alignment.topLeft,
                end: Alignment.bottomRight,
                colors: [
                  Color.lerp(const Color(0xFFF5F5F5), const Color(0xFFE0E0E0), _backgroundAnimation.value)!,
                  Color.lerp(const Color(0xFFFFFFFF), const Color(0xFFF5F5F5), _backgroundAnimation.value)!,
                ],
              ),
            ),
            child: Stack(
              children: [
                for (int i = 0; i < 30; i++)
                  Particle(
                    animation: _particlesAnimation,
                    size: Random().nextDouble() * 5 + 2,
                    color: Colors.blueGrey.withOpacity(Random().nextDouble() * 0.3 + 0.1), 
                    alignment: Alignment(
                      (Random().nextDouble() * 2 - 1) * (2 - _particlesAnimation.value),
                      (Random().nextDouble() * 2 - 1) * (2 - _particlesAnimation.value),
                    ),
                  ),

                Center(
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      Transform.scale(
                        scale: _logoAnimation.value,
                        child: SvgPicture.asset(
                          Assets.images.logo.path,
                          height: 140,
                          width: 140,
                        ),
                      ),
                      const SizedBox(height: 30),
                    ],
                  ),
                ),
              ],
            ),
          );
        },
      ),
    );
  }
}

class Particle extends StatelessWidget {
  final Animation<double> animation;
  final double size;
  final Color color;
  final Alignment alignment;

  const Particle({
    super.key,
    required this.animation,
    required this.size,
    required this.color,
    required this.alignment,
  });

  @override
  Widget build(BuildContext context) {
    return Align(
      alignment: alignment,
      child: Opacity(
        opacity: animation.value,
        child: Container(
          width: size,
          height: size,
          decoration: BoxDecoration(
            color: color,
            shape: BoxShape.circle,
          ),
        ),
      ),
    );
  }
}