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lib/tool/encryption_util.dart

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+import 'dart:convert';
+import 'dart:typed_data';
+import 'package:encrypt/encrypt.dart' as enc;
+import 'package:archive/archive.dart';
+
+class EncryptionUtil {
+  // 固定密钥（和后端保持一致）
+  static const String _keyStr = ",Lscj312.;[]sc`1dsajcjc;;wislacx";
+  static const String _ivStr = ",>ew:[7890;,wd[2";
+
+  // 对外简易方法（你 Service / Provider 里直接用）
+  static String encrypt(String data) => encryptAndCompress(data);
+  static String decrypt(String encryptedBase64) => decompressAndDecrypt(encryptedBase64);
+
+  /// 加密：字符串 → GZIP → AES → Base64
+  static String encryptAndCompress(String plainText) {
+    // 强制 32位 Key / 16位 IV（AES 标准）
+    final key = enc.Key.fromUtf8(_keyStr.padRight(32).substring(0, 32));
+    final iv = enc.IV.fromUtf8(_ivStr.padRight(16).substring(0, 16));
+    final encrypter = enc.Encrypter(enc.AES(key, mode: enc.AESMode.cbc));
+
+    // GZIP 压缩
+    final utf8Bytes = utf8.encode(plainText);
+    final compressed = GZipEncoder().encode(utf8Bytes)!;
+
+    // AES 加密
+    final encrypted = encrypter.encryptBytes(
+      Uint8List.fromList(compressed),
+      iv: iv,
+    );
+
+    return encrypted.base64;
+  }
+
+  /// 解密：Base64 → AES → GZIP → 字符串
+  static String decompressAndDecrypt(String encryptedBase64) {
+    final key = enc.Key.fromUtf8(_keyStr.padRight(32).substring(0, 32));
+    final iv = enc.IV.fromUtf8(_ivStr.padRight(16).substring(0, 16));
+    final encrypter = enc.Encrypter(enc.AES(key, mode: enc.AESMode.cbc));
+
+    // 解密
+    final encrypted = enc.Encrypted.fromBase64(encryptedBase64);
+    final decryptedBytes = encrypter.decryptBytes(encrypted, iv: iv);
+
+    // GZIP 解压
+    final decompressed = GZipDecoder().decodeBytes(decryptedBytes);
+
+    return utf8.decode(decompressed);
+  }
+}

lib/tool/gradientText.dart

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+import 'package:flutter/material.dart';
+
+class GradientLayer {
+  final Gradient gradient;
+  final BlendMode blendMode;
+
+  const GradientLayer({
+    required this.gradient,
+    this.blendMode = BlendMode.srcIn, // 默认第一层用 srcIn 打底
+  });
+}
+
+class GradientText extends StatelessWidget {
+  final String data;
+  final TextStyle? style;
+  final TextAlign? textAlign;
+  final TextDirection? textDirection;
+  final bool softWrap;
+  final TextOverflow? overflow;
+  final double? textScaleFactor;
+  final int? maxLines;
+  final Locale? locale;
+  final String? semanticsLabel;
+  final TextWidthBasis? textWidthBasis;
+  final TextHeightBehavior? textHeightBehavior;
+  final List<GradientLayer> gradientLayers;
+
+  const GradientText({
+    Key? key,
+    required this.data,
+    this.style,
+    this.textAlign,
+    this.textDirection,
+    this.softWrap = true,
+    this.overflow,
+    this.textScaleFactor,
+    this.maxLines,
+    this.locale,
+    this.semanticsLabel,
+    this.textWidthBasis,
+    this.textHeightBehavior,
+    this.gradientLayers = const [],
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    if (gradientLayers.isEmpty) {
+      return Text(
+        data,
+        style: style,
+        textAlign: textAlign,
+        textDirection: textDirection,
+        softWrap: softWrap,
+        overflow: overflow,
+        textScaleFactor: textScaleFactor,
+        maxLines: maxLines,
+        locale: locale,
+        semanticsLabel: semanticsLabel,
+        textWidthBasis: textWidthBasis,
+        textHeightBehavior: textHeightBehavior,
+      );
+    }
+
+    final baseStyle = style ?? const TextStyle();
+
+    return Stack(
+      children: [
+        // 1. 最底层：纯色文本（可选，防止所有渐变都透明时看不见）
+        // 如果第一层渐变是 srcIn，这一层其实可以被遮挡，但保留它作为“备用底色”
+        Opacity(
+          opacity: 0.0, // 隐藏，仅占位
+          child: _buildText(baseStyle.copyWith(color: Colors.black)),
+        ),
+
+        // 2. 叠加渐变层
+        ...gradientLayers.asMap().entries.map((entry) {
+          final index = entry.key;
+          final layer = entry.value;
+
+          // 关键逻辑：
+          // 如果是第一层且用户没改 blendMode，默认用 srcIn 确保文字有颜色
+          // 如果是后续层，通常希望融合，所以建议用户传入 overlay/plus 等
+
+          return ShaderMask(
+            shaderCallback: (Rect bounds) {
+              return layer.gradient.createShader(bounds);
+            },
+            blendMode: layer.blendMode,
+            child: _buildText(
+              // 重要：为了融合效果，内部文本通常是白色或浅色
+              // 如果 blendMode 是 srcIn，颜色不重要（会被渐变替换）
+              // 如果 blendMode 是 overlay/plus，白色能让渐变颜色最纯正地显示
+              baseStyle.copyWith(color: Colors.white),
+            ),
+          );
+        }).toList(),
+      ],
+    );
+  }
+
+  Widget _buildText(TextStyle effectiveStyle) {
+    return Text(
+      data,
+      style: effectiveStyle,
+      textAlign: textAlign,
+      textDirection: textDirection,
+      softWrap: softWrap,
+      overflow: overflow,
+      textScaleFactor: textScaleFactor,
+      maxLines: maxLines,
+      locale: locale,
+      semanticsLabel: semanticsLabel,
+      textWidthBasis: textWidthBasis,
+      textHeightBehavior: textHeightBehavior,
+    );
+  }
+}