From 9e2951071121cc1dda1ff072176abd81397f59ae Mon Sep 17 00:00:00 2001
From: "pramod.mahajan" <pramod.mahajan@marcoaiot.com>
Date: Thu, 11 Dec 2025 01:11:14 +0530
Subject: [PATCH] added hook for handle flip side

---
 src/services/pmsGrid/useGridCore.js | 74 ++++++++++++++++++++++++++++-
 1 file changed, 73 insertions(+), 1 deletion(-)

diff --git a/src/services/pmsGrid/useGridCore.js b/src/services/pmsGrid/useGridCore.js
index e94f7cd8..7b673f6a 100644
--- a/src/services/pmsGrid/useGridCore.js
+++ b/src/services/pmsGrid/useGridCore.js
@@ -1,4 +1,4 @@
-import { useState, useMemo, useCallback, useEffect } from "react";
+import { useState, useMemo, useCallback, useEffect,useLayoutEffect } from "react";
 
 /*
   options:
@@ -239,3 +239,75 @@ export function useGridCore({
     serverMode,
   };
 }
+
+
+
+
+
+
+
+
+
+export function useDropdownPosition(btnRef, menuRef, isOpen, level = 0) {
+  const [style, setStyle] = useState({});
+
+  useLayoutEffect(() => {
+    if (!isOpen || !btnRef.current || !menuRef.current) return;
+
+    const updatePosition = () => {
+      const btn = btnRef.current.getBoundingClientRect();
+      const menu = menuRef.current;
+
+      const menuHeight = menu.offsetHeight;
+      const menuWidth = menu.offsetWidth;
+
+      const vh = window.innerHeight;
+      const vw = window.innerWidth;
+
+      const spaceBelow = vh - btn.bottom;
+      const spaceAbove = btn.top;
+
+      // ------------ AUTO FLIP (top/bottom) ------------
+      const openUp = menuHeight > spaceBelow && spaceAbove > spaceBelow;
+      let top = openUp ? btn.top - menuHeight : btn.bottom;
+
+      if (top < 8) top = 8;
+      if (top + menuHeight > vh - 8) top = vh - menuHeight - 8;
+
+      // ------------ AUTO FLIP (left/right) ------------
+      let left = btn.left;
+
+      if (level === 0) {
+        // Main menu
+        if (left + menuWidth > vw - 8) left = vw - menuWidth - 8;
+      } else {
+        // Nested menu opens to right
+        left = btn.right;
+        if (left + menuWidth > vw - 8) {
+          left = btn.left - menuWidth; // flip to left if overflow
+        }
+      }
+
+      setStyle({
+        position: "fixed",
+        top,
+        left,
+        zIndex: 99999,
+        maxHeight: vh - 16,
+        overflowY: "auto",
+      });
+    };
+
+    // RUN AFTER MENU RENDERS
+    requestAnimationFrame(updatePosition);
+
+    // RUN AGAIN after potential layout changes
+    setTimeout(updatePosition, 50);
+
+    window.addEventListener("resize", updatePosition);
+    return () => window.removeEventListener("resize", updatePosition);
+  }, [isOpen, level]);
+
+  return style;
+}
+