update pop menu

example/lib/example_pop_up_menu.dart

@@ -15,6 +15,7 @@ class _ExamplePopUpMenuState extends State<ExamplePopUpMenu> {
       title: 'PopUpMenu',
       body: ListView(
         children: [
+          SizedBox(height: 500),
           ListTile(
             title: 'PopUpMenu'.text,
             trailing: Builder(

lib/pop_up_menu/pop_up_menu.dart

@@ -1,4 +1,3 @@
-import 'package:ansu_ui/utils/screen_adapter.dart';
 import 'package:ansu_ui/extension/num_extension.dart';
 import 'package:flutter/material.dart';
 
@@ -17,15 +16,17 @@ Future<T> showASPopUpMenu<T>({
   T initValue,
 }) async {
   final RenderBox renderBox = context.findRenderObject();
-  Offset offset = renderBox.localToGlobal(Offset.zero);
+  Size size = renderBox.size;
   return await showMenu(
     context: context,
     initialValue: initValue,
-    position: RelativeRect.fromLTRB(
-      offset.dx,
-      offset.dy,
-      screenWidth,
-      screenHeight,
+    position: RelativeRect.fromRect(
+      Rect.fromPoints(
+        renderBox.localToGlobal(Offset.zero,
+            ancestor: Overlay.of(context).context.findRenderObject()),
+        renderBox.localToGlobal(size.bottomRight(Offset.zero)),
+      ),
+      Offset.zero & Overlay.of(context).context.size,
     ),
     items: items,
     shape: RoundedRectangleBorder(borderRadius: 10.radius),