refactor(translation): 重构翻译模式选择器的显示逻辑

移除手动计算锚点的冗余代码，统一从悬浮按钮位置展开
优化选择器动画和背景处理，提升用户体验

lib/modules/translation/controllers/translation_controller.dart

@@ -23,6 +23,7 @@ import '../../../data/services/ble_manager.dart';
 import 'record_timer_controller.dart';
 import 'translation_history_controller.dart';
 import '../models/translation_models.dart';
+import '../views/dialogs/translation_mode_selector.dart';
 
 /// 音频输出设备枚举
 enum AudioOutputDevice {
@@ -285,6 +286,17 @@ class TranslationController extends GetxController with WidgetsBindingObserver {
 
     // 监听应用生命周期：当应用切到后台/失焦时兜底重置 activeSpeaker
     WidgetsBinding.instance.addObserver(this);
+
+    // 延迟显示模式选择器，确保页面已经完全加载
+    // Future.delayed(const Duration(milliseconds: 100), () {
+    //   _showModeSelector();
+    // });
+    //确保关键服务初始化完成
+    WidgetsBinding.instance.addPostFrameCallback((_) async {
+      // 确保上下文有效
+      if (Get.context == null || !Get.context!.mounted) return;
+      _showModeSelector();
+    });
   }
 
   /// 预先检查权限
@@ -339,6 +351,18 @@ class TranslationController extends GetxController with WidgetsBindingObserver {
     }
   }
 
+  /// 显示模式选择器
+  void _showModeSelector() {
+    try {
+      final isDarkMode = Get.theme.brightness == Brightness.dark;
+
+      // 直接使用现有的翻译模式选择器组件
+      TranslationModeSelector.show(isDarkMode);
+    } catch (e) {
+      Logger.error('显示模式选择器失败: $e');
+    }
+  }
+
   /// 保存悬浮按钮位置
   void saveFloatingButtonPosition(Offset position) {
     floatingButtonPosition.value = position;

lib/modules/translation/views/dialogs/translation_mode_selector.dart

@@ -11,20 +11,25 @@ class TranslationModeSelector {
   static void show(bool isDarkMode, {Offset? anchor}) {
     final controller = Get.find<TranslationController>();
 
-    // 计算缩放对齐点（-1..1）。如果未提供 anchor，则从底部中间展开
-    Alignment alignment = Alignment.bottomCenter;
-    if (anchor != null) {
-      final Size screenSize = MediaQuery.of(Get.context!).size;
-      final double ax = (anchor.dx / screenSize.width) * 2 - 1;
-      final double ay = (anchor.dy / screenSize.height) * 2 - 1;
-      alignment = Alignment(ax, ay);
-    }
+    // 总是从悬浮按钮位置展开，不依赖传入的anchor参数
+    final Size screenSize = MediaQuery.of(Get.context!).size;
+    final Offset floatingButtonPos = controller.floatingButtonPosition.value;
+    
+    // 计算悬浮按钮的中心点位置（从右下角偏移转换为屏幕坐标）
+    final double buttonSize = 56.0; // 悬浮按钮的大小
+    final double buttonCenterX = screenSize.width - floatingButtonPos.dx - buttonSize / 2;
+    final double buttonCenterY = screenSize.height - floatingButtonPos.dy - buttonSize / 2;
+    
+    // 计算缩放对齐点（-1..1）
+    final double ax = (buttonCenterX / screenSize.width) * 2 - 1;
+    final double ay = (buttonCenterY / screenSize.height) * 2 - 1;
+    final Alignment alignment = Alignment(ax, ay);
 
     Get.generalDialog(
       barrierLabel: 'translation_mode_selector',
-      barrierDismissible: true,
-      barrierColor: Colors.black.withOpacity(0.35),
-      transitionDuration: const Duration(milliseconds: 250),
+      barrierDismissible: true, // 允许点击背景关闭
+      barrierColor: Colors.transparent, // 设置为透明，让自定义模糊层处理点击
+      transitionDuration: const Duration(milliseconds: 300),
       pageBuilder: (context, animation, secondaryAnimation) {
         return const SizedBox.shrink();
       },
@@ -35,17 +40,22 @@ class TranslationModeSelector {
             reverseCurve: Curves.easeInCubic);
         return Stack(
           children: [
-            // 模糊背景
-            Positioned.fill(
+            // 修复：将模糊背景放在可点击区域
+            GestureDetector(
+              onTap: () => Get.back(), // 添加点击关闭功能
               child: BackdropFilter(
                 filter: ImageFilter.blur(sigmaX: 10.0, sigmaY: 10.0),
-                child: Container(color: Colors.transparent),
+                child: Container(
+                  color: isDarkMode
+                      ? Colors.black.withOpacity(0.55)
+                      : Colors.grey.withOpacity(0.95), // 添加半透明背景
+                ),
               ),
             ),
-            // 将缩放应用在一个全屏容器上，以便 alignment 以屏幕为参考
+            // 内容区域
             ScaleTransition(
               alignment: alignment,
-              scale: Tween<double>(begin: 0.0, end: 1.0).animate(curved),
+              scale: Tween<double>(begin: 0.1, end: 1.0).animate(curved),
               child: FadeTransition(
                 opacity: curved,
                 child: SizedBox.expand(
@@ -127,19 +137,19 @@ class TranslationModeSelector {
                       }
                     : null,
               ),
-              SizedBox(height: 24.w),
-              GestureDetector(
-                onTap: () => Get.back(),
-                child: Container(
-                  width: 42,
-                  height: 42,
-                  decoration: BoxDecoration(
-                    color: Colors.black.withValues(alpha: 0.8),
-                    borderRadius: BorderRadius.circular(50),
-                  ),
-                  child: const Icon(Icons.close, color: Colors.white),
-                ),
-              ),
+              SizedBox(height: 64.w),
+              // GestureDetector(
+              //   onTap: () => Get.back(),
+              //   child: Container(
+              //     width: 42,
+              //     height: 42,
+              //     decoration: BoxDecoration(
+              //       color: Colors.black.withValues(alpha: 0.8),
+              //       borderRadius: BorderRadius.circular(50),
+              //     ),
+              //     child: const Icon(Icons.close, color: Colors.white),
+              //   ),
+              // ),
               if (Platform.isAndroid) SizedBox(height: 20.h),
             ],
           ),

lib/modules/translation/views/translation_view.dart

@@ -145,15 +145,15 @@ class TranslationView extends GetView<TranslationController> {
             onTap: () {
               // 点击标题时弹出翻译模式选择器
               // 从拖拽按钮位置作为锚点打开
-              final pos = controller.floatingButtonPosition.value;
-              final Size screen = MediaQuery.of(Get.context!).size;
-              // 已保存的是距右、下的偏移，需要换算为屏幕坐标中的中心点
-              final double buttonSize = 56.w;
-              final double left = screen.width - pos.dx - buttonSize;
-              final double top = screen.height - pos.dy - buttonSize;
-              final Offset anchor =
-                  Offset(left + buttonSize / 2, top + buttonSize / 2);
-              TranslationModeSelector.show(isDarkMode, anchor: anchor);
+              // final pos = controller.floatingButtonPosition.value;
+              // final Size screen = MediaQuery.of(Get.context!).size;
+              // // 已保存的是距右、下的偏移，需要换算为屏幕坐标中的中心点
+              // final double buttonSize = 56.w;
+              // final double left = screen.width - pos.dx - buttonSize;
+              // final double top = screen.height - pos.dy - buttonSize;
+              // final Offset anchor =
+              //     Offset(left + buttonSize / 2, top + buttonSize / 2);
+              TranslationModeSelector.show(isDarkMode);
             },
             child: Text(
               controller.currentModeTitle.value.tr,

lib/modules/translation/views/widgets/draggable_floating_button.dart

@@ -108,13 +108,7 @@ class DraggableFloatingButton extends StatelessWidget {
 
   /// 显示翻译模式选择器
   void _showTranslationModeSelector(bool isDarkMode) {
-    // 使用保存的位置换算按钮中心点（与标题点击一致）
-    final pos = controller.floatingButtonPosition.value; // 距右、下的偏移
-    final Size screen = MediaQuery.of(Get.context!).size;
-    final double buttonSize = 56.w;
-    final double left = screen.width - pos.dx - buttonSize;
-    final double top = screen.height - pos.dy - buttonSize;
-    final Offset anchor = Offset(left + buttonSize / 2, top + buttonSize / 2);
-    TranslationModeSelector.show(isDarkMode, anchor: anchor);
+    // 直接调用模式选择器，它会自动从悬浮按钮位置展开
+    TranslationModeSelector.show(isDarkMode);
   }
 }