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feat(conversation): customizable scrollbar for conversation content #392

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feat(conversation): customizable scrollbar for conversation content #392

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5041001
feat(conversation): customizable scrollbar for conversation content
kejiwuxian Mar 4, 2026
0254dc2
fix(conversation): use ScrollArea primitive from radix-ui directly
kejiwuxian Mar 5, 2026
2ccfcff
Merge branch 'vercel:main' into feat/customizable-scrollbar-for-conve…
kejiwuxian Mar 6, 2026
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46 changes: 36 additions & 10 deletions packages/elements/src/conversation.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -5,8 +5,9 @@ import type { ComponentProps } from "react";
import { Button } from "@repo/shadcn-ui/components/ui/button";
import { cn } from "@repo/shadcn-ui/lib/utils";
import { ArrowDownIcon, DownloadIcon } from "lucide-react";
import { useCallback } from "react";
import { useCallback, useRef, useEffect } from "react";
import { StickToBottom, useStickToBottomContext } from "use-stick-to-bottom";
import { ScrollArea } from "@repo/shadcn-ui/components/ui/scroll-area";

export type ConversationProps = ComponentProps<typeof StickToBottom>;

Expand All @@ -20,19 +21,44 @@ export const Conversation = ({ className, ...props }: ConversationProps) => (
/>
);

export type ConversationContentProps = ComponentProps<
typeof StickToBottom.Content
>;
export type ConversationContentProps = ComponentProps<typeof ScrollArea> & {
scrollClassName?: string;
};

export const ConversationContent = ({
children,
className,
scrollClassName,
...props
}: ConversationContentProps) => (
<StickToBottom.Content
className={cn("flex flex-col gap-8 p-4", className)}
{...props}
/>
);
}: ConversationContentProps) => {
const context = useStickToBottomContext();
const scrollAreaRef = useRef<HTMLDivElement>(null);

useEffect(() => {
if (scrollAreaRef.current && context.scrollRef) {
const viewportElement = scrollAreaRef.current.querySelector(
'[data-slot="scroll-area-viewport"]'
);
if (viewportElement) {
const ContentElement = viewportElement as HTMLElement;
ContentElement.className = cn("size-full overflow-y-auto", scrollClassName);
ContentElement.style.scrollbarGutter = "stable both-edges";
context.scrollRef.current = ContentElement;
}
}
}, [context.scrollRef, scrollClassName]);

return (
<ScrollArea ref={scrollAreaRef} className="size-full" {...props}>
<div
ref={context.contentRef}
className={cn("flex flex-col gap-8 p-4", className)}
>
{children}
</div>
</ScrollArea>
);
}

export type ConversationEmptyStateProps = ComponentProps<"div"> & {
title?: string;
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