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

import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import '../../controllers/translation_controller.dart';
import '../dialogs/translation_mode_selector.dart';

/// 可拖拽悬浮按钮组件
class DraggableFloatingButton extends StatelessWidget {
  final bool isDarkMode;
  final TranslationController controller;

  const DraggableFloatingButton({
    Key? key,
    required this.isDarkMode,
    required this.controller,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Obx(() => Positioned(
          right: controller.floatingButtonPosition.value.dx, // 使用保存的位置
          bottom: controller.floatingButtonPosition.value.dy, // 使用保存的位置
          child: Draggable(
            feedback: Material(
              color: Colors.transparent,
              child: Container(
                width: 56.w,
                height: 56.w,
                decoration: BoxDecoration(
                  color: (isDarkMode ? Colors.grey[700] : Colors.blue)
                      ?.withOpacity(0.8),
                  shape: BoxShape.circle,
                  boxShadow: [
                    BoxShadow(
                      color: Colors.black.withOpacity(0.3),
                      blurRadius: 8,
                      offset: const Offset(0, 4),
                    ),
                  ],
                ),
                child: Icon(
                  Icons.translate,
                  color: Colors.white,
                  size: 24.sp,
                ),
              ),
            ),
            childWhenDragging: Container(
              width: 56.w,
              height: 56.w,
              decoration: BoxDecoration(
                color: (isDarkMode ? Colors.grey[700] : Colors.blue)
                    ?.withOpacity(0.3),
                shape: BoxShape.circle,
              ),
            ),
            onDragEnd: (details) {
              _handleDragEnd(context, details);
            },
            child: GestureDetector(
              onTap: () => _showTranslationModeSelector(isDarkMode),
              child: Container(
                width: 56.w,
                height: 56.w,
                decoration: BoxDecoration(
                  color: isDarkMode ? Colors.grey[700] : Colors.blue,
                  shape: BoxShape.circle,
                  boxShadow: [
                    BoxShadow(
                      color: Colors.black.withOpacity(0.2),
                      blurRadius: 6,
                      offset: const Offset(0, 3),
                    ),
                  ],
                ),
                child: Icon(
                  Icons.translate,
                  color: Colors.white,
                  size: 24.sp,
                ),
              ),
            ),
          ),
        ));
  }

  /// 处理拖拽结束事件
  void _handleDragEnd(BuildContext context, DraggableDetails details) {
    final screenSize = MediaQuery.of(context).size;
    final appBarHeight = Scaffold.of(context).appBarMaxHeight ?? kToolbarHeight;
    final statusBarHeight = MediaQuery.of(context).padding.top;
    final safeAreaTop = statusBarHeight + appBarHeight;

    // 计算新位置（相对于屏幕右下角）
    final newRight = screenSize.width - details.offset.dx - 56.w;
    final newBottom = screenSize.height - details.offset.dy - 56.w;

    // 边界检查，确保按钮不会超出屏幕或被AppBar遮盖
    final clampedRight = newRight.clamp(0.0, screenSize.width - 56.w);
    final clampedBottom = newBottom.clamp(
      0.0, // 底部边界
      screenSize.height - safeAreaTop - 56.w, // 顶部边界（避免被AppBar遮盖）
    );

    // 保存新位置
    controller.saveFloatingButtonPosition(Offset(clampedRight, clampedBottom));
  }

  /// 显示翻译模式选择器
  void _showTranslationModeSelector(bool isDarkMode) {
    TranslationModeSelector.show(isDarkMode);
  }
}