feat(图片翻译): 实现图片翻译功能并添加结果预览

添加图片翻译API调用功能，包括：
1. 新增图片翻译相关模型类(Point2D, ImageTextBlock, ImageTranslationResult)
2. 实现火山引擎图片翻译API调用逻辑
3. 在界面中添加翻译结果图片预览区域
4. 优化翻译服务初始化逻辑避免重复初始化
5. 适配暗黑模式下的UI显示

lib/data/services/volcano_translation_service.dart

@@ -1,5 +1,6 @@
 import 'dart:convert';
 import 'dart:math';
+import 'dart:typed_data';
 import '../../data/models/appconfig.dart';
 import 'package:get_storage/get_storage.dart';
 import 'package:http/http.dart' as http;
@@ -8,16 +9,17 @@ import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:get/get.dart';
 import '../../core/utils/logger.dart';
 import 'language_manager.dart';
+import '../../modules/picture_translation/models/picture_translation_models.dart';
 
 //// 火山引擎机器翻译服务
 class VolcanoTranslationService extends GetxService {
   // API 配置
   late String _baseUrl;
   final String _endpoint = '/'; // 修改为根路径
-  late final String _accessKey;
-  late final String _secretKey;
-  late final String _region;
-  late final String _service;
+  late String _accessKey;
+  late String _secretKey;
+  late String _region;
+  late String _service;
 
   // 初始化标志
   bool _isInitialized = false;
@@ -27,9 +29,22 @@ class VolcanoTranslationService extends GetxService {
   // final GetStorage _storage = GetStorage();
   // 构造函数
   VolcanoTranslationService();
+  @override
+  Future<void> onInit() async {
+    await initialize();
+    super.onInit();
+  }
+
+  // 对外暴露初始化状态，便于控制器判断
+  bool get isInitialized => _isInitialized;
 
   // 初始化服务
   Future<bool> initialize() async {
+    // 已初始化则直接返回，避免重复初始化
+    if (_isInitialized) {
+      Logger.info('翻译服务已初始化，跳过重复初始化');
+      return true;
+    }
     try {
       // 优先使用后端 AppConfig，其次回退到 .env
       final bool appConfigReady = AppConfig.isInitialized();
@@ -63,7 +78,8 @@ class VolcanoTranslationService extends GetxService {
       }
 
       _isInitialized = true;
-      Logger.info('lxm---Volcano Translation Service initialized成功');
+      Logger.info(
+          'lxm---Volcano Translation Service initialized成功, accessKey: $_accessKey, region: $_region, service: $_service,secretKey: $_secretKey');
       return true;
     } catch (e) {
       Logger.error('lxm---Volcano Translation Service initialized失败，$e');
@@ -271,4 +287,110 @@ class VolcanoTranslationService extends GetxService {
       return null;
     }
   }
+
+  /// 图片翻译（整图识别+回贴翻译）
+  Future<ImageTranslationResult?> translateImage({
+    required Uint8List imageBytes,
+    required String targetLanguageCode, // ASR代码，如 zh-CN / en-US
+  }) async {
+    if (!_isInitialized) {
+      Logger.error('图片翻译服务未初始化');
+      return null;
+    }
+
+    try {
+      // 目标语言短代码（例如 zh / en）
+      String targetCode = 'zh';
+      final targetShortCode =
+          _languageManager.getShortCodeByAsrCode(targetLanguageCode);
+      if (targetShortCode != null && targetShortCode.isNotEmpty) {
+        targetCode = targetShortCode;
+      }
+
+      // 将图片二进制转为base64字符串（不带前缀）
+      final imgBase64 = base64.encode(imageBytes);
+
+      // 构建请求体（根据官方文档）
+      final requestBody = {
+        'Image': imgBase64,
+        'TargetLanguage': targetCode,
+      };
+
+      // 查询参数（官方示例仅包含 Action/Version；为保持与文本翻译一致，保留 Region/Service）
+      final queryParams = {
+        'Action': 'TranslateImage',
+        'Version': '2020-07-01',
+        'Region': _region,
+        'Service': _service,
+      };
+
+      // 生成签名与请求头
+      final headers = _generateSignature('POST', requestBody, queryParams);
+
+      // 拼接请求URL
+      final queryString = Uri(queryParameters: queryParams).query;
+      final url = '$_baseUrl/?$queryString';
+
+      final response = await http.post(
+        Uri.parse(url),
+        headers: headers,
+        body: json.encode(requestBody),
+      );
+
+      if (response.statusCode == 200) {
+        final responseData = json.decode(response.body);
+
+        // 错误元数据检测
+        if (responseData is Map &&
+            responseData['ResponseMetadata'] is Map &&
+            (responseData['ResponseMetadata']['Error'] != null)) {
+          final err = responseData['ResponseMetadata']['Error'];
+          Logger.error('图片翻译错误: code=${err['Code']}, message=${err['Message']}');
+          return null;
+        }
+
+        // 解析回贴图片
+        Uint8List? translatedImage;
+        if (responseData['Image'] is String) {
+          try {
+            translatedImage = base64.decode(responseData['Image']);
+          } catch (_) {
+            translatedImage = null;
+          }
+        }
+
+        // 解析文本块
+        final List<ImageTextBlock> blocks = [];
+        if (responseData['TextBlocks'] is List) {
+          for (final item in (responseData['TextBlocks'] as List)) {
+            if (item is Map<String, dynamic>) {
+              blocks.add(ImageTextBlock.fromJson(item));
+            } else if (item is Map) {
+              blocks.add(ImageTextBlock.fromJson(
+                  item.map((k, v) => MapEntry(k.toString(), v))));
+            }
+          }
+        }
+
+        // 提取一个整体检测语种（若存在文本块）
+        String? detectedLang;
+        if (blocks.isNotEmpty && blocks.first.detectedLanguage.isNotEmpty) {
+          detectedLang = blocks.first.detectedLanguage;
+        }
+
+        return ImageTranslationResult(
+          translatedImageBytes: translatedImage,
+          blocks: blocks,
+          detectedLanguage: detectedLang,
+        );
+      }
+
+      Logger.error(
+          '图片翻译HTTP错误: status=${response.statusCode}, body=${response.body}');
+      return null;
+    } catch (e) {
+      Logger.error('图片翻译请求异常: $e');
+      return null;
+    }
+  }
 }

lib/modules/picture_translation/controllers/picture_translation_controller.dart

@@ -30,6 +30,7 @@ class PictureTranslationController extends GetxController {
   final targetLanguageChineseName = '英语'.obs;
   final sourceText = ''.obs;
   final translatedText = ''.obs;
+  final translatedImageBytes = Rx<Uint8List?>(null); // 回贴后的图片二进制
   final isProcessing = false.obs;
   final pickedImageFile = Rx<File?>(null);
   final currentStep = ProcessingStep(
@@ -215,27 +216,11 @@ class PictureTranslationController extends GetxController {
       file = await _preprocessImage(file);
       pickedImageFile.value = file;
 
-      _updateStep('识别文本', '正在分析图片中的文本...', ProcessingStatus.recognizing,
-          progress: 0.3);
+      // 直接调用图片翻译API（包含识别+回贴）
+      _updateStep('翻译图片', '正在调用图片翻译服务...', ProcessingStatus.translating,
+          progress: 0.6);
 
-      // 文本识别
-      // final inputImage = InputImage.fromFile(file);
-      // final RecognizedText recognizedText =
-      //     await _textRecognizer.processImage(inputImage);
-
-      // sourceText.value = recognizedText.text.trim();
-
-      if (sourceText.value.isEmpty) {
-        _updateStep('识别完成', '未识别到任何文本', ProcessingStatus.idle);
-        translatedText.value = '';
-        return;
-      }
-
-      _updateStep('翻译文本', '正在翻译识别的文本...', ProcessingStatus.translating,
-          progress: 0.7);
-
-      // 执行翻译
-      await _performTranslation();
+      await _performImageTranslation(file);
 
       // 保存历史记录
       if (sourceText.value.isNotEmpty && translatedText.value.isNotEmpty) {
@@ -293,22 +278,53 @@ class PictureTranslationController extends GetxController {
     }
   }
 
-  /// 执行翻译
-  Future<void> _performTranslation() async {
-    final sourceCode = languageManager
-            .getAsrCodeByChineseName(sourceLanguageChineseName.value) ??
-        'zh-CN';
-    final targetCode = languageManager
-            .getAsrCodeByChineseName(targetLanguageChineseName.value) ??
-        'en-US';
-
-    final result = await _translationService.translateText(
-      text: sourceText.value,
-      sourceLanguageCode: sourceCode,
-      targetLanguageCode: targetCode,
-    );
+  /// 执行图片翻译（调用火山引擎图片翻译API）
+  Future<void> _performImageTranslation(File imageFile) async {
+    try {
+      final bytes = await imageFile.readAsBytes();
 
-    translatedText.value = result ?? '';
+      // 图片大小限制：4MB（文档要求）
+      const int maxSize = 4 * 1024 * 1024;
+      if (bytes.lengthInBytes > maxSize) {
+        _updateStep('处理失败', '图片大小超过4MB限制', ProcessingStatus.error);
+        _showErrorDialog('处理失败', '图片大小超过4MB限制，请降低质量或尺寸后重试');
+        return;
+      }
+
+      final targetCode = languageManager
+              .getAsrCodeByChineseName(targetLanguageChineseName.value) ??
+          'zh-CN';
+
+      final result = await _translationService.translateImage(
+        imageBytes: bytes,
+        targetLanguageCode: targetCode,
+      );
+
+      if (result == null) {
+        _updateStep('处理失败', '图片翻译接口返回空结果', ProcessingStatus.error);
+        _showErrorDialog('处理失败', '图片翻译失败，可能的原因：网络异常或接口限流，请稍后重试');
+        return;
+      }
+
+      // 更新回贴图片
+      translatedImageBytes.value = result.translatedImageBytes != null
+          ? Uint8List.fromList(result.translatedImageBytes!)
+          : null;
+
+      // 将文本块汇总为识别文本与翻译文本，便于展示与复制
+      if (result.blocks.isNotEmpty) {
+        sourceText.value = result.blocks.map((b) => b.text).join('\n');
+        translatedText.value =
+            result.blocks.map((b) => b.translation).join('\n');
+      } else {
+        sourceText.value = '';
+        translatedText.value = '';
+      }
+    } catch (e) {
+      Logger.error('PictureTranslation', '图片翻译调用失败: $e');
+      _updateStep('处理失败', e.toString(), ProcessingStatus.error);
+      _showErrorDialog('处理失败', '图片翻译接口调用异常，请检查网络后重试');
+    }
   }
 
   /// 保存翻译结果
@@ -395,6 +411,7 @@ class PictureTranslationController extends GetxController {
   void reset() {
     sourceText.value = '';
     translatedText.value = '';
+    translatedImageBytes.value = null;
     pickedImageFile.value = null;
     _updateStep('等待操作', '请选择图片开始翻译', ProcessingStatus.idle);
   }

lib/modules/picture_translation/models/picture_translation_models.dart

@@ -132,3 +132,64 @@ class ProcessingStep {
     );
   }
 }
+
+/// 图片翻译返回的坐标点模型（用于文本块四个点）
+class Point2D {
+  final int x;
+  final int y;
+
+  Point2D({required this.x, required this.y});
+
+  /// 从JSON创建
+  factory Point2D.fromJson(Map<String, dynamic> json) {
+    return Point2D(
+      x: (json['X'] ?? 0) as int,
+      y: (json['Y'] ?? 0) as int,
+    );
+  }
+}
+
+/// 图片翻译返回的文本块模型
+class ImageTextBlock {
+  final List<Point2D> points; // 文本块四点坐标
+  final String detectedLanguage; // 检测到的语种
+  final String text; // 识别内容
+  final String translation; // 翻译结果
+  final List<int>? foreColor; // 文字平均色 RGBA
+  final List<int>? backColor; // 背景平均色 RGBA
+
+  ImageTextBlock({
+    required this.points,
+    required this.detectedLanguage,
+    required this.text,
+    required this.translation,
+    this.foreColor,
+    this.backColor,
+  });
+
+  /// 从JSON创建
+  factory ImageTextBlock.fromJson(Map<String, dynamic> json) {
+    final List<dynamic> pts = (json['Points'] ?? []) as List<dynamic>;
+    return ImageTextBlock(
+      points: pts.map((e) => Point2D.fromJson(e as Map<String, dynamic>)).toList(),
+      detectedLanguage: (json['DetectedLanguage'] ?? '') as String,
+      text: (json['Text'] ?? '') as String,
+      translation: (json['Translation'] ?? '') as String,
+      foreColor: (json['ForeColor'] as List?)?.map((e) => e as int).toList(),
+      backColor: (json['BackColor'] as List?)?.map((e) => e as int).toList(),
+    );
+  }
+}
+
+/// 图片翻译结果模型（包含回贴后的图片和文本块列表）
+class ImageTranslationResult {
+  final List<int>? translatedImageBytes; // 回贴后的图片二进制（Uint8List）
+  final List<ImageTextBlock> blocks; // 文本块列表
+  final String? detectedLanguage; // 可选：整体检测到的语种
+
+  ImageTranslationResult({
+    required this.translatedImageBytes,
+    required this.blocks,
+    this.detectedLanguage,
+  });
+}

lib/modules/picture_translation/views/picture_translation_view.dart

@@ -15,9 +15,10 @@ class PictureTranslationView extends GetView<PictureTranslationController> {
 
   @override
   Widget build(BuildContext context) {
+    final isDarkMode = Theme.of(context).brightness == Brightness.dark;
     return Scaffold(
       backgroundColor: Colors.grey[50],
-      appBar: _buildAppBar(),
+      appBar: _buildAppBar(isDarkMode),
       body: SafeArea(
         child: Obx(() {
           return CustomScrollView(
@@ -53,20 +54,27 @@ class PictureTranslationView extends GetView<PictureTranslationController> {
   }
 
   /// 构建应用栏
-  PreferredSizeWidget _buildAppBar() {
+  PreferredSizeWidget _buildAppBar(bool isDarkMode) {
     return AppBar(
       leading: IconButton(
         icon: Icon(
           Icons.arrow_back_ios,
           size: 20.w,
-          color: Colors.black87,
+          color: isDarkMode ? Colors.white : Colors.black87,
         ),
         onPressed: () => Get.back(),
       ),
       centerTitle: true,
-      title: const Text('图片翻译'),
-      backgroundColor: Colors.white,
-      foregroundColor: Colors.black87,
+      title: Text(
+        'pictureTranslation'.tr,
+        style: TextStyle(
+          fontSize: 18.sp,
+          fontWeight: FontWeight.w600,
+          color: isDarkMode ? Colors.white : Colors.black,
+        ),
+      ),
+      backgroundColor: isDarkMode ? Colors.black : Colors.white,
+      foregroundColor: isDarkMode ? Colors.white : Colors.black87,
       elevation: 0,
       actions: [
         IconButton(
@@ -492,6 +500,55 @@ class PictureTranslationView extends GetView<PictureTranslationController> {
               controller.targetLanguageChineseName.value,
               Colors.green,
             ),
+          if (controller.translatedImageBytes.value != null) ...[
+            Padding(
+              padding: EdgeInsets.symmetric(horizontal: 16.w),
+              child: Text(
+                '翻译后的图片预览',
+                style: TextStyle(
+                  fontSize: 14.sp,
+                  fontWeight: FontWeight.w600,
+                  color: Colors.black87,
+                ),
+              ),
+            ),
+            SizedBox(height: 8.h),
+            Container(
+              height: 200.h,
+              margin: EdgeInsets.symmetric(horizontal: 16.w)
+                  .copyWith(bottom: 16.h),
+              decoration: BoxDecoration(
+                color: Colors.grey[100],
+                borderRadius: BorderRadius.circular(8.r),
+                border: Border.all(color: Colors.grey[300]!),
+              ),
+              child: ClipRRect(
+                borderRadius: BorderRadius.circular(8.r),
+                child: Image.memory(
+                  controller.translatedImageBytes.value!,
+                  fit: BoxFit.cover,
+                  width: double.infinity,
+                  errorBuilder: (context, error, stackTrace) {
+                    return Center(
+                      child: Column(
+                        mainAxisAlignment: MainAxisAlignment.center,
+                        children: [
+                          Icon(Icons.error_outline,
+                              size: 48.sp, color: Colors.red[400]),
+                          SizedBox(height: 8.h),
+                          Text(
+                            '翻译图片加载失败',
+                            style: TextStyle(
+                                fontSize: 14.sp, color: Colors.red[600]),
+                          ),
+                        ],
+                      ),
+                    );
+                  },
+                ),
+              ),
+            ),
+          ],
         ],
       ),
     );

lib/modules/text_translation/controllers/text_translation_controller.dart

@@ -10,7 +10,8 @@ import '../../../core/utils/logger.dart';
 /// 文本翻译控制器
 class TextTranslationController extends GetxController {
   // 依赖服务
-  final VolcanoTranslationService _translationService = Get.find<VolcanoTranslationService>();
+  final VolcanoTranslationService _translationService =
+      Get.find<VolcanoTranslationService>();
   final LanguageManager _languageManager = Get.find<LanguageManager>();
   final GetStorage _storage = GetStorage();
 
@@ -47,6 +48,12 @@ class TextTranslationController extends GetxController {
   /// 初始化翻译服务
   Future<void> _initializeTranslationService() async {
     try {
+      // 已初始化则跳过
+      if (_translationService.isInitialized) {
+        Logger.info('翻译服务已初始化');
+        return;
+      }
+      // final initialized =
       final initialized = await _translationService.initialize();
       if (!initialized) {
         Logger.error('翻译服务初始化失败');
@@ -74,22 +81,28 @@ class TextTranslationController extends GetxController {
   /// 加载保存的语言设置
   void _loadSavedLanguages() {
     try {
-      final savedSourceLanguage = _storage.read('text_translation_source_language');
-      final savedTargetLanguage = _storage.read('text_translation_target_language');
+      final savedSourceLanguage =
+          _storage.read('text_translation_source_language');
+      final savedTargetLanguage =
+          _storage.read('text_translation_target_language');
 
-      if (savedSourceLanguage != null && supportedLanguages.contains(savedSourceLanguage)) {
+      if (savedSourceLanguage != null &&
+          supportedLanguages.contains(savedSourceLanguage)) {
         sourceLanguageChineseName.value = savedSourceLanguage;
         // 同时更新语言代码
-        final asrCode = _languageManager.getAsrCodeByChineseName(savedSourceLanguage);
+        final asrCode =
+            _languageManager.getAsrCodeByChineseName(savedSourceLanguage);
         if (asrCode != null) {
           sourceLanguageCode.value = asrCode;
         }
       }
 
-      if (savedTargetLanguage != null && supportedLanguages.contains(savedTargetLanguage)) {
+      if (savedTargetLanguage != null &&
+          supportedLanguages.contains(savedTargetLanguage)) {
         targetLanguageChineseName.value = savedTargetLanguage;
         // 同时更新语言代码
-        final asrCode = _languageManager.getAsrCodeByChineseName(savedTargetLanguage);
+        final asrCode =
+            _languageManager.getAsrCodeByChineseName(savedTargetLanguage);
         if (asrCode != null) {
           targetLanguageCode.value = asrCode;
         }
@@ -102,8 +115,10 @@ class TextTranslationController extends GetxController {
   /// 保存语言设置
   void _saveLanguageSettings() {
     try {
-      _storage.write('text_translation_source_language', sourceLanguageChineseName.value);
-      _storage.write('text_translation_target_language', targetLanguageChineseName.value);
+      _storage.write(
+          'text_translation_source_language', sourceLanguageChineseName.value);
+      _storage.write(
+          'text_translation_target_language', targetLanguageChineseName.value);
     } catch (e) {
       Logger.error('保存语言设置失败: $e');
     }
@@ -173,20 +188,21 @@ class TextTranslationController extends GetxController {
   /// 执行翻译
   Future<void> translateText() async {
     final text = textController.text.trim();
-    
+
     // 验证输入
     if (text.isEmpty) {
-      Get.snackbar(
-        'error'.tr,
-        'pleaseInputText'.tr,
-        snackPosition: SnackPosition.TOP,
-        backgroundColor: Colors.orange.withOpacity(0.9),
-        colorText: Colors.white,
-      );
+      // Get.snackbar(
+      //   'error'.tr,
+      //   'pleaseInputText'.tr,
+      //   snackPosition: SnackPosition.TOP,
+      //   backgroundColor: Colors.orange.withOpacity(0.9),
+      //   colorText: Colors.white,
+      // );
       return;
     }
-    
-    if (text.length > 1000) {
+
+    if (text.length > 5000) {
+      // 5000 字符限制
       Get.snackbar(
         'error'.tr,
         'textTooLong'.tr,
@@ -196,24 +212,29 @@ class TextTranslationController extends GetxController {
       );
       return;
     }
-    
+
     // 检查源语言和目标语言是否相同
     if (sourceLanguageChineseName.value == targetLanguageChineseName.value) {
       translatedText.value = text;
       return;
     }
-    
+
     isTranslating.value = true;
     translatedText.value = '';
-    
+
     try {
       Logger.info('开始翻译: $text');
-      Logger.info('源语言: ${sourceLanguageChineseName.value} -> ${sourceLanguageCode.value}');
-      Logger.info('目标语言: ${targetLanguageChineseName.value} -> ${targetLanguageCode.value}');
+      Logger.info(
+          '源语言: ${sourceLanguageChineseName.value} -> ${sourceLanguageCode.value}');
+      Logger.info(
+          '目标语言: ${targetLanguageChineseName.value} -> ${targetLanguageCode.value}');
 
       // 确保翻译服务已初始化
       Logger.info('确保翻译服务已初始化...');
-      final initialized = await _translationService.initialize();
+      bool initialized = _translationService.isInitialized;
+      if (!initialized) {
+        initialized = await _translationService.initialize();
+      }
       Logger.info('翻译服务初始化结果: $initialized');
       if (!initialized) {
         throw Exception('翻译服务初始化失败');
@@ -289,7 +310,9 @@ class TextTranslationController extends GetxController {
                 mainAxisAlignment: MainAxisAlignment.spaceBetween,
                 children: [
                   Text(
-                    isSourceLanguage ? 'sourceLanguage'.tr : 'targetLanguage'.tr,
+                    isSourceLanguage
+                        ? 'sourceLanguage'.tr
+                        : 'targetLanguage'.tr,
                     style: const TextStyle(
                       fontSize: 18,
                       fontWeight: FontWeight.bold,
@@ -311,10 +334,12 @@ class TextTranslationController extends GetxController {
                   final isSelected = isSourceLanguage
                       ? language == sourceLanguageChineseName.value
                       : language == targetLanguageChineseName.value;
-                  
+
                   return ListTile(
                     title: Text(language),
-                    trailing: isSelected ? const Icon(Icons.check, color: Colors.blue) : null,
+                    trailing: isSelected
+                        ? const Icon(Icons.check, color: Colors.blue)
+                        : null,
                     onTap: () {
                       if (isSourceLanguage) {
                         setSourceLanguage(language);

lib/modules/text_translation/views/text_translation_view.dart

@@ -55,12 +55,13 @@ class TextTranslationView extends GetView<TextTranslationController> {
         ),
         onPressed: () => Get.back(),
       ),
+      centerTitle: true,
       title: Text(
         'textTranslation'.tr,
         style: TextStyle(
-          color: isDarkMode ? Colors.white : Colors.black,
           fontSize: 18.sp,
           fontWeight: FontWeight.w600,
+          color: isDarkMode ? Colors.white : Colors.black,
         ),
       ),
       actions: [