core/apps/webapp/app/components/ui/scrollarea.tsx

import * as ScrollAreaPrimitive from "@radix-ui/react-scroll-area";
import React from "react";

import { cn } from "../../lib/utils";

interface ScrollAreaProps
  extends React.ComponentPropsWithoutRef<typeof ScrollAreaPrimitive.Root> {
  orientation?: "horizontal" | "vertical";
}

// Add this custom hook above the ScrollArea component
function useScrollRestoration(
  id: string | undefined,
  ref: React.RefObject<HTMLDivElement>,
) {
  React.useEffect(() => {
    const element = ref.current as any;

    const handleScroll = () => {
      (window as any).__scrollPositions[id as string] = {
        scrollTop: element.scrollTop,
        scrollLeft: element.scrollLeft,
      };
    };

    if (id && ref.current) {
      // Initialize window storage if it doesn't exist
      if (!(window as any).__scrollPositions) {
        (window as any).__scrollPositions = {};
      }

      // Restore scroll position on mount
      const savedPosition = (window as any).__scrollPositions[id];
      if (savedPosition) {
        const { scrollTop, scrollLeft } = savedPosition;
        element.scrollTop = scrollTop;
        element.scrollLeft = scrollLeft;
      }

      // Add scroll event listener to save position while scrolling

      element.addEventListener("scroll", handleScroll);
    }

    // Cleanup: remove event listener and save final position
    return () => {
      element.removeEventListener("scroll", handleScroll);
    };
  }, [id, ref]);
}

const ScrollArea = React.forwardRef<
  React.ElementRef<typeof ScrollAreaPrimitive.Root>,
  ScrollAreaProps
>(({ className, children, orientation = "vertical", id, ...props }, ref) => {
  const viewportRef = React.useRef<HTMLDivElement>(null);
  useScrollRestoration(id, viewportRef);

  return (
    <ScrollAreaPrimitive.Root
      ref={ref}
      className={cn("relative overflow-hidden", className)}
      {...props}
    >
      <ScrollAreaPrimitive.Viewport
        className="scroll-area h-full w-full rounded-[inherit]"
        id={id}
        ref={viewportRef}
      >
        {children}
      </ScrollAreaPrimitive.Viewport>
      <ScrollBar orientation={orientation} />
      <ScrollAreaPrimitive.Corner />
    </ScrollAreaPrimitive.Root>
  );
});
ScrollArea.displayName = ScrollAreaPrimitive.Root.displayName;

const ScrollBar = React.forwardRef<
  React.ElementRef<typeof ScrollAreaPrimitive.ScrollAreaScrollbar>,
  React.ComponentPropsWithoutRef<typeof ScrollAreaPrimitive.ScrollAreaScrollbar>
>(({ className, orientation = "vertical", ...props }, ref) => (
  <ScrollAreaPrimitive.ScrollAreaScrollbar
    ref={ref}
    orientation={orientation}
    className={cn(
      "flex touch-none transition-colors select-none",
      orientation === "vertical" &&
        "h-full w-2.5 border-l border-l-transparent p-[1px]",
      orientation === "horizontal" &&
        "h-2.5 flex-col border-t border-t-transparent p-[1px]",
      className,
    )}
    {...props}
  >
    <ScrollAreaPrimitive.ScrollAreaThumb className="bg-border relative flex-1 rounded-full" />
  </ScrollAreaPrimitive.ScrollAreaScrollbar>
));
ScrollBar.displayName = ScrollAreaPrimitive.ScrollAreaScrollbar.displayName;

export { ScrollArea, ScrollBar };