import 'package:flutter/material.dart';

class AnimatedGradientBackground extends StatefulWidget {
  final Widget child;

  const AnimatedGradientBackground(this.child, {super.key});

  @override
  State<AnimatedGradientBackground> createState() =>
      _AnimatedGradientBackgroundState();
}

class _AnimatedGradientBackgroundState extends State<AnimatedGradientBackground>
    with SingleTickerProviderStateMixin {
  late AnimationController _controller;
  late Animation<Alignment?> _beginAnimation;
  late Animation<Alignment?> _endAnimation;

  final Color color1 = const Color(0xFFfbcfdd);
  final Color color2 = const Color(0xFFe2e9fb);

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

    _controller = AnimationController(
      vsync: this,
      duration: const Duration(seconds: 10),
    )..repeat(reverse: true);

    // 创建起始点动画
    _beginAnimation = AlignmentTween(
      begin: Alignment.topCenter,
      end: Alignment.bottomLeft,
    ).animate(_controller);

    // 创建结束点动画
    _endAnimation = AlignmentTween(
      begin: Alignment.bottomCenter,
      end: Alignment.topRight,
    ).animate(_controller);
  }

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

  @override
  Widget build(BuildContext context) {
    return AnimatedBuilder(
      animation: _controller,
      builder: (context, child) {
        return Container(
          decoration: BoxDecoration(
            gradient: LinearGradient(
              colors: [color1, color2],
              begin: _beginAnimation.value!,
              end: _endAnimation.value!,
            ),
          ),
          child: child,
        );
      },
      child: widget.child,
    );
  }
}