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hmtl preview on touch screens #2176
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114 changes: 114 additions & 0 deletions
114
components/brain/left-sidebar/waves/memes-quick-vote/MemesQuickVoteDescription.tsx
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| "use client"; | ||
|
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| import { useCallback, useEffect, useRef, useState } from "react"; | ||
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| interface MemesQuickVoteDescriptionProps { | ||
| readonly description: string; | ||
| } | ||
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| export default function MemesQuickVoteDescription({ | ||
| description, | ||
| }: MemesQuickVoteDescriptionProps) { | ||
| const [isExpanded, setIsExpanded] = useState(false); | ||
| const [isOverflowing, setIsOverflowing] = useState(false); | ||
| const visibleDescriptionRef = useRef<HTMLParagraphElement | null>(null); | ||
| const clampClass = isExpanded | ||
| ? "tw-line-clamp-none" | ||
| : "tw-line-clamp-1 md:tw-line-clamp-4"; | ||
| const descriptionClassName = | ||
| "tw-mb-0 tw-whitespace-pre-line tw-text-sm tw-font-medium tw-leading-relaxed tw-text-iron-400 md:tw-text-md"; | ||
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| const measureOverflow = useCallback(() => { | ||
| const visibleDescription = visibleDescriptionRef.current; | ||
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| if (!visibleDescription) { | ||
| return; | ||
| } | ||
|
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| const computedStyles = globalThis.getComputedStyle(visibleDescription); | ||
| const lineHeight = Number.parseFloat(computedStyles.lineHeight || "0"); | ||
| const collapsedLineCount = globalThis.matchMedia("(min-width: 768px)") | ||
| .matches | ||
| ? 4 | ||
| : 1; | ||
| const collapsedHeight = lineHeight * collapsedLineCount; | ||
|
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| if (!Number.isFinite(collapsedHeight) || collapsedHeight <= 0) { | ||
| return; | ||
| } | ||
|
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| const previousDisplay = visibleDescription.style.display; | ||
| const previousOverflow = visibleDescription.style.overflow; | ||
| const previousWebkitLineClamp = visibleDescription.style.webkitLineClamp; | ||
|
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| visibleDescription.style.display = "block"; | ||
| visibleDescription.style.overflow = "visible"; | ||
| visibleDescription.style.webkitLineClamp = "unset"; | ||
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| const fullHeight = visibleDescription.getBoundingClientRect().height; | ||
|
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| visibleDescription.style.display = previousDisplay; | ||
| visibleDescription.style.overflow = previousOverflow; | ||
| visibleDescription.style.webkitLineClamp = previousWebkitLineClamp; | ||
|
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| const nextIsOverflowing = fullHeight > collapsedHeight + 1; | ||
|
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| setIsOverflowing((current) => | ||
| current === nextIsOverflowing ? current : nextIsOverflowing | ||
| ); | ||
| }, []); | ||
|
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| useEffect(() => { | ||
| const frameId = globalThis.requestAnimationFrame(() => { | ||
| measureOverflow(); | ||
| }); | ||
|
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| if (typeof ResizeObserver === "undefined") { | ||
| const handleResize = () => { | ||
| measureOverflow(); | ||
| }; | ||
|
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| globalThis.addEventListener("resize", handleResize); | ||
| return () => { | ||
| globalThis.removeEventListener("resize", handleResize); | ||
| globalThis.cancelAnimationFrame(frameId); | ||
| }; | ||
| } | ||
|
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| const observer = new ResizeObserver(() => { | ||
| measureOverflow(); | ||
| }); | ||
|
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| if (visibleDescriptionRef.current) { | ||
| observer.observe(visibleDescriptionRef.current); | ||
| } | ||
|
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| return () => { | ||
| observer.disconnect(); | ||
| globalThis.cancelAnimationFrame(frameId); | ||
| }; | ||
| }, [measureOverflow]); | ||
|
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| return ( | ||
| <div className="tw-space-y-1.5"> | ||
| <p | ||
| ref={visibleDescriptionRef} | ||
| className={`${descriptionClassName} ${clampClass}`} | ||
| > | ||
| {description} | ||
| </p> | ||
| {isOverflowing && ( | ||
| <button | ||
| type="button" | ||
| aria-expanded={isExpanded} | ||
| onClick={() => { | ||
| setIsExpanded((current) => !current); | ||
| }} | ||
| className="tw-inline-flex tw-w-fit tw-border-0 tw-bg-transparent tw-px-0 tw-py-1 tw-text-xs tw-font-medium tw-leading-none tw-text-iron-500 tw-transition-colors tw-duration-200 focus-visible:tw-outline focus-visible:tw-outline-2 focus-visible:tw-outline-offset-2 focus-visible:tw-outline-white/15 desktop-hover:hover:tw-text-iron-300" | ||
| > | ||
| {isExpanded ? "See less" : "See more"} | ||
| </button> | ||
| )} | ||
| </div> | ||
| ); | ||
| } |
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