a tool for shared writing and social publishing
implement collapsing thread replies
Jared Pereira
(Dec 19, 2025, 7:20 AM +0400)
c1e986c4
80ea9419
+59
-12
+59
-12
app/lish/[did]/[publication]/[rkey]/ThreadPage.tsx
+59
-12
app/lish/[did]/[publication]/[rkey]/ThreadPage.tsx
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"use client";
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import { useEffect, useRef } from "react";
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import { AppBskyFeedDefs, AppBskyFeedPost } from "@atproto/api";
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import useSWR, { preload } from "swr";
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import { PageWrapper } from "components/Pages/Page";
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import { useHasPageLoaded } from "components/InitialPageLoadProvider";
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import { openPage, OpenPage } from "./PostPages";
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import { useCardBorderHidden } from "components/Pages/useCardBorderHidden";
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import { useThreadState } from "src/useThreadState";
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import { scrollIntoViewIfNeeded } from "src/utils/scrollIntoViewIfNeeded";
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type ThreadViewPost = AppBskyFeedDefs.ThreadViewPost;
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type NotFoundPost = AppBskyFeedDefs.NotFoundPost;
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function ThreadContent(props: { thread: ThreadType; threadUri: string }) {
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const { thread, threadUri } = props;
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const mainPostRef = useRef<HTMLDivElement>(null);
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// Scroll the main post into view when the thread loads
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useEffect(() => {
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if (mainPostRef.current) {
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mainPostRef.current.scrollIntoView({
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behavior: "instant",
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block: "start",
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});
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}
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}, []);
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if (AppBskyFeedDefs.isNotFoundPost(thread)) {
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return <PostNotAvailable />;
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))}
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{/* Main post */}
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<ThreadPost
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post={thread}
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isMainPost={true}
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showReplyLine={false}
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threadUri={threadUri}
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/>
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<div ref={mainPostRef}>
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<ThreadPost
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post={thread}
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isMainPost={true}
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showReplyLine={false}
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threadUri={threadUri}
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/>
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</div>
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{/* Replies */}
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{thread.replies && thread.replies.length > 0 && (
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depth: number;
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}) {
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const { replies, threadUri, depth } = props;
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const collapsedThreads = useThreadState((s) => s.collapsedThreads);
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const toggleCollapsed = useThreadState((s) => s.toggleCollapsed);
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return (
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<div className="flex flex-col gap-0">
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}
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const hasReplies = reply.replies && reply.replies.length > 0;
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const isCollapsed = collapsedThreads.has(reply.post.uri);
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const replyCount = reply.replies?.length ?? 0;
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return (
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<div key={reply.post.uri} className="flex flex-col">
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threadUri={threadUri}
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/>
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{hasReplies && depth < 3 && (
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<div className="ml-5 pl-5 border-l border-border-light">
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<Replies
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replies={reply.replies as any[]}
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threadUri={threadUri}
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depth={depth + 1}
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/>
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<div className="ml-2 flex">
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{/* Clickable collapse line - w-8 matches avatar width, centered line aligns with avatar center */}
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<button
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onClick={(e) => {
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e.stopPropagation();
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toggleCollapsed(reply.post.uri);
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}}
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className="group w-8 flex justify-center cursor-pointer shrink-0"
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aria-label={
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isCollapsed ? "Expand replies" : "Collapse replies"
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}
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>
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<div className="w-0.5 h-full bg-border-light group-hover:bg-accent-contrast group-hover:w-1 transition-all" />
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</button>
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{isCollapsed ? (
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<button
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onClick={(e) => {
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e.stopPropagation();
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toggleCollapsed(reply.post.uri);
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}}
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className="text-xs text-accent-contrast hover:underline py-1 pl-1"
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>
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Show {replyCount} {replyCount === 1 ? "reply" : "replies"}
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</button>
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) : (
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<div className="grow">
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<Replies
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replies={reply.replies as any[]}
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threadUri={threadUri}
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depth={depth + 1}
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/>
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</div>
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)}
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</div>
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)}
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{hasReplies && depth >= 3 && (