Update theme.dart

增加阴影

Author: LiLinXiang

lib/src/theme.dart

@@ -53,6 +53,12 @@ class EasyLoadingTheme {
               ? Colors.black.withOpacity(0.9)
               : Colors.white;
 
+    /// boxShadow color of loading
+  static List<BoxShadow>? get boxShadow =>
+      EasyLoading.instance.loadingStyle == EasyLoadingStyle.custom
+          ? EasyLoading.instance.boxShadow!
+          : null;
+  
   /// font color of status
   static Color get textColor =>
       EasyLoading.instance.loadingStyle == EasyLoadingStyle.custom