07Skeleton shimmer rows

<main class="stage">
  <div class="skel-list" aria-busy="true">
    <div class="skel-list__row">
      <span class="skel-list__avatar" aria-hidden="true"></span>
      <span class="skel-list__lines" aria-hidden="true"><span></span><span></span></span>
      <span class="skel-list__content"><strong>Lee Seo-jun</strong><span>left a new comment</span></span>
    </div>
    <div class="skel-list__row">
      <span class="skel-list__avatar" aria-hidden="true"></span>
      <span class="skel-list__lines" aria-hidden="true"><span></span><span></span></span>
      <span class="skel-list__content"><strong>Park Ha-yoon</strong><span>shared your post</span></span>
    </div>
    <button class="skel-list__toggle" type="button">Preview content</button>
  </div>
</main>

@use "../../../../site/static/demo-tokens" as *;

$duration: 1.4s;                                       // 한 번 훑는 시간
$easing: linear;
$color: #d8d8de;                                       // 스켈레톤 막대 바탕
$highlight: rgba(255, 255, 255, .95);                  // 훑고 지나가는 밝은 띠 — 바탕과 대비를 크게 둔다

@include stage($stage-orange);

.skel-list {
  width: min(240px, 78vw);
  display: flex;
  flex-direction: column;
  gap: $sp-3;
}

.skel-list__row {
  display: flex;
  align-items: center;
  gap: $sp-3;
  padding: $sp-3;
  border-radius: $r-card;
  background: $stage-paper;
}

.skel-list__avatar {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(90deg, $color 25%, $highlight 50%, $color 75%);
  background-size: 200% 100%;
  animation: skel-shimmer $duration $easing infinite;
}

.skel-list__lines {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: $sp-2;
  span {
    display: block;
    height: 10px;
    border-radius: $r-xs;
    background: linear-gradient(90deg, $color 25%, $highlight 50%, $color 75%);
    background-size: 200% 100%;
    animation: skel-shimmer $duration $easing infinite;
    &:last-child { width: 60%; }
  }
}

.skel-list__content {
  display: none;
  flex: 1 1 auto;
  flex-direction: column;
  gap: $sp-1;
  font-size: 12px;
  strong { font-size: 13px; color: $stage-ink; }
  span { color: rgba(23, 20, 26, .6); }
}

.skel-list.is-loaded .skel-list__avatar,
.skel-list.is-loaded .skel-list__lines { display: none; }
.skel-list.is-loaded .skel-list__content { display: flex; }

.skel-list__toggle {
  align-self: flex-start;
  border: 0;
  border-radius: $r-pill;
  padding: $sp-1 $sp-3;
  background: $stage-ink;
  color: $stage-paper;
  font-size: 11px;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
}

@keyframes skel-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

@media (prefers-reduced-motion: reduce) {
  .skel-list__avatar, .skel-list__lines span { animation-duration: 3.2s; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.skel-list {
  width: min(240px, 78vw);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.skel-list__row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: 16px;
  background: #ffffff;
}

.skel-list__avatar {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(90deg, #d8d8de 25%, rgba(255, 255, 255, 0.95) 50%, #d8d8de 75%);
  background-size: 200% 100%;
  animation: skel-shimmer 1.4s linear infinite;
}

.skel-list__lines {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.skel-list__lines span {
  display: block;
  height: 10px;
  border-radius: 4px;
  background: linear-gradient(90deg, #d8d8de 25%, rgba(255, 255, 255, 0.95) 50%, #d8d8de 75%);
  background-size: 200% 100%;
  animation: skel-shimmer 1.4s linear infinite;
}
.skel-list__lines span:last-child {
  width: 60%;
}

.skel-list__content {
  display: none;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
}
.skel-list__content strong {
  font-size: 13px;
  color: #17141a;
}
.skel-list__content span {
  color: rgba(23, 20, 26, 0.6);
}

.skel-list.is-loaded .skel-list__avatar,
.skel-list.is-loaded .skel-list__lines {
  display: none;
}

.skel-list.is-loaded .skel-list__content {
  display: flex;
}

.skel-list__toggle {
  align-self: flex-start;
  border: 0;
  border-radius: 999px;
  padding: 4px 12px;
  background: #17141a;
  color: #ffffff;
  font-size: 11px;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
}

@keyframes skel-shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .skel-list__avatar, .skel-list__lines span {
    animation-duration: 3.2s;
  }
}

document.querySelector('.skel-list__toggle').addEventListener('click', function () {
  var list = document.querySelector('.skel-list');
  var loaded = list.classList.toggle('is-loaded');
  list.setAttribute('aria-busy', String(!loaded));
  this.textContent = loaded ? 'Show skeleton again' : 'Preview content';
});

import { useState, type CSSProperties } from "react";
import styles from "./SkeletonShimmerRows.module.scss";

export type SkeletonShimmerRowsProps = {
  people: { name: string; action: string }[];
  loaded?: boolean;
  /** 한 번 훑는 시간 (기본 1.4s) */
  duration?: number;
};

type Vars = CSSProperties & { "--duration"?: string };

export default function SkeletonShimmerRows({ people, loaded = false, duration = 1400 }: SkeletonShimmerRowsProps) {
  const [isLoaded, setIsLoaded] = useState(loaded);
  const vars: Vars = { "--duration": `${duration}ms` };

  return (
    <div className={styles.list} style={vars} aria-busy={!isLoaded}>
      {people.map((p) => (
        <div className={styles.row} key={p.name}>
          {isLoaded ? (
            <span className={styles.content}>
              <strong>{p.name}</strong>
              <span>{p.action}</span>
            </span>
          ) : (
            <>
              <span className={styles.avatar} aria-hidden="true" />
              <span className={styles.lines} aria-hidden="true"><span /><span /></span>
            </>
          )}
        </div>
      ))}
      <button className={styles.toggle} type="button" onClick={() => setIsLoaded((v) => !v)}>
        {isLoaded ? "스켈레톤 다시 보기" : "콘텐츠 미리보기"}
      </button>
    </div>
  );
}