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a tool for shared writing and social publishing
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3.2 kB · 94 lines
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495"use client";import { useEffect, useRef, useState } from "react";import { useSpring, animated } from "@react-spring/web";import useMeasure from "react-use-measure";
// The read-only "ALT" pill that expands to reveal alt text. Shared by the// editor (ImageAltButton's reader mode) and published posts so both render alt// text identically. Purely presentational — takes the alt string directly so it// has no replicache dependency and is safe to render on public post pages.export function ReadOnlyAltText(props: { alt: string; className?: string; onSeeMore?: () => void;}) { let [showAlt, setShowAlt] = useState(false); let [altRef, { height: altHeight }] = useMeasure(); let altStyle = useSpring({ height: showAlt ? altHeight : 0, opacity: showAlt ? 1 : 0, config: { tension: 450, friction: 30, clamp: true }, });
if (!props.alt) return null;
return ( <div onBlur={(e) => { let group = e.currentTarget; requestAnimationFrame(() => { if (!group.contains(document.activeElement)) setShowAlt(false); }); }} className={`absolute bottom-1.5 right-1.5 left-1.5 flex flex-col h-fit ${props.className || ""}`} > <div className="flex gap-1 items-center justify-end"> <button onMouseDown={(e) => { e.stopPropagation(); setShowAlt((s) => !s); }} > <div className="text-xs font-bold px-1 leading-tight opaque-container border-2! border-secondary! text-secondary rounded-md! h-5"> ALT </div> </button> </div> <animated.div style={{ ...altStyle, overflow: "hidden" }}> <div className="pt-1" ref={altRef}> <AltTextBody alt={props.alt} onSeeMore={props.onSeeMore} /> </div> </animated.div> </div> );}
// The alt text itself, clamped on the image. Alt longer than the clamp gets a// "See more" that hands off to the lightbox, which can give it the full height.export function AltTextBody(props: { alt: string; onSeeMore?: () => void }) { let [overflows, setOverflows] = useState(false); let textRef = useRef<HTMLDivElement>(null);
useEffect(() => { let el = textRef.current; if (!el) return; let measure = () => setOverflows(el.scrollHeight > el.clientHeight + 1); measure(); let observer = new ResizeObserver(measure); observer.observe(el); return () => observer.disconnect(); }, [props.alt]);
return ( <div className="opaque-container leading-snug text-secondary border-none! text-sm px-1.5 p-1 shrink-0"> <div className="relative"> <div ref={textRef} className="line-clamp-4"> {props.alt} </div> {overflows && props.onSeeMore && ( // Sits on the clipped last line, over the text it truncates. <button className="absolute bottom-0 right-0 bg-bg-page pl-2 text-accent-contrast " onMouseDown={(e) => e.stopPropagation()} onClick={(e) => { e.stopPropagation(); props.onSeeMore?.(); }} > See more </button> )} </div> </div> );}