05Image bubble loading

<main class="stage">
  <figure class="bubble is-demo">
    <span class="skeleton">
      <span class="shine"></span>
    </span>
    <span class="photo"></span>
    <figcaption class="caption">Sending photo</figcaption>
  </figure>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────────
$duration: $dur-enter;     // 스켈레톤이 사진으로 바뀌는 데 걸리는 시간
$easing: $ease-out;
$color: $subject-cream;    // 말풍선 틀 색 (ink 무대라 cream)

@include stage($stage-ink);

.bubble {
  position: relative;
  width: min(200px, 60vw);
  aspect-ratio: 4 / 3;
  margin: 0;
  padding: 6px;
  border-radius: $r-card;
  background: $color;
  overflow: hidden;
}
.skeleton, .photo {
  position: absolute;
  inset: 6px;
  border-radius: 10px;
}
.skeleton { background: rgba($stage-ink, .12); overflow: hidden; }
.shine {
  position: absolute;
  top: 0;
  left: -60%;
  width: 60%;
  height: 100%;
  background: linear-gradient(100deg, rgba(255, 255, 255, 0), rgba(255, 255, 255, .55), rgba(255, 255, 255, 0));

  .bubble.is-demo & { animation: shine-loop $dur-loop $easing infinite; }
}
.photo {
  background: linear-gradient(135deg, $subject-blue, $stage-orange);
  opacity: 0;

  .bubble.is-demo & { animation: photo-in-loop $dur-loop $easing infinite; }
}
.caption {
  margin: 4px 2px 0;
  font-weight: 600; font-size: clamp(10px, 3vw, 12px); line-height: 1; font-family: inherit;
  color: $subject-ink;   // 말풍선(크림) 안 스켈레톤 위 글자 — AA 4.5 (blog-design 글자 대비)
  opacity: .85;
}

// 셰이머가 두 번 훑고 지나간 뒤 사진이 opacity 로 나타난다
@keyframes shine-loop {
  0%   { transform: translateX(0); }
  60%  { transform: translateX(360%); }
  100% { transform: translateX(360%); }
}
@keyframes photo-in-loop {
  0%   { opacity: 0; }
  62%  { opacity: 0; }
  85%  { opacity: 1; }
  100% { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .shine, .photo { animation: none !important; }
  .photo { opacity: 1; }
  .shine { opacity: 0; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.bubble {
  position: relative;
  width: min(200px, 60vw);
  aspect-ratio: 4/3;
  margin: 0;
  padding: 6px;
  border-radius: 16px;
  background: #fff7e6;
  overflow: hidden;
}

.skeleton, .photo {
  position: absolute;
  inset: 6px;
  border-radius: 10px;
}

.skeleton {
  background: rgba(23, 20, 26, 0.12);
  overflow: hidden;
}

.shine {
  position: absolute;
  top: 0;
  left: -60%;
  width: 60%;
  height: 100%;
  background: linear-gradient(100deg, rgba(255, 255, 255, 0), rgba(255, 255, 255, 0.55), rgba(255, 255, 255, 0));
}
.bubble.is-demo .shine {
  animation: shine-loop 2s ease-out infinite;
}

.photo {
  background: linear-gradient(135deg, #2f6df6, #ff4d1f);
  opacity: 0;
}
.bubble.is-demo .photo {
  animation: photo-in-loop 2s ease-out infinite;
}

.caption {
  margin: 4px 2px 0;
  font-weight: 600;
  font-size: clamp(10px, 3vw, 12px);
  line-height: 1;
  font-family: inherit;
  color: #17141a;
  opacity: 0.85;
}

@keyframes shine-loop {
  0% {
    transform: translateX(0);
  }
  60% {
    transform: translateX(360%);
  }
  100% {
    transform: translateX(360%);
  }
}
@keyframes photo-in-loop {
  0% {
    opacity: 0;
  }
  62% {
    opacity: 0;
  }
  85% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}
@media (prefers-reduced-motion: reduce) {
  .shine, .photo {
    animation: none !important;
  }
  .photo {
    opacity: 1;
  }
  .shine {
    opacity: 0;
  }
}

import type { CSSProperties } from "react";
import styles from "./ImageBubbleLoading.module.scss";

export type ImageBubbleLoadingProps = {
  /** 이미지 로드가 끝났는가 */
  loaded: boolean;
  duration?: number;
  easing?: string;
  className?: string;
};

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

export default function ImageBubbleLoading({
  loaded,
  duration = 600,
  easing = "ease-out",
  className = "",
}: ImageBubbleLoadingProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing };

  return (
    <figure className={`${styles.bubble} ${className}`} style={vars}>
      <span className={`${styles.skeleton} ${loaded ? styles.fade : ""}`}>
        <span className={styles.shine} />
      </span>
      <span className={`${styles.photo} ${loaded ? styles.show : ""}`} />
    </figure>
  );
}