07途切れた地点を覚えるエラーシェイクとリトライ

<main class="stage">
<div class="es is-demo" id="esRoot">
  <div class="es__row">
    <span class="es__label" id="esLabel">
      <b class="es__label-run">送信中</b>
      <b class="es__label-err">送信失敗</b>
    </span>
    <span class="es__warn" aria-hidden="true">
      <svg viewBox="0 0 256 256" width="14" height="14"><g fill="currentColor"><path d="M236 128a108 108 0 1 1-108-108a108 108 0 0 1 108 108" opacity=".2"/><path d="M128 24a104 104 0 1 0 104 104A104.11 104.11 0 0 0 128 24m0 192a88 88 0 1 1 88-88a88.1 88.1 0 0 1-88 88m-8-80V80a8 8 0 0 1 16 0v56a8 8 0 0 1-16 0m20 36a12 12 0 1 1-12-12a12 12 0 0 1 12 12"/></g></svg>
    </span>
    <button class="es__retry" id="esRetry" type="button" aria-label="アップロード再試行">
      <svg viewBox="0 0 256 256" width="14" height="14"><g fill="currentColor"><path d="M197.67 186.37a94.06 94.06 0 0 1-66.79 27.66a93 93 0 0 1-11-.65a94.19 94.19 0 0 1-82.14-71.71a8 8 0 0 1 15.53-3.8a78.19 78.19 0 0 0 68.17 59.63a78 78 0 0 0 64.16-26.4a8 8 0 0 1 12.07 10.5Zm38.24-66.14a8 8 0 0 0-9.6 6.06a78 78 0 0 1-27.68 41.72a8 8 0 1 0 9.66 12.76a94.06 94.06 0 0 0 33.31-50.24a94.19 94.19 0 0 0-52.71-98.86a8 8 0 0 0-6.9 14.44a78 78 0 0 1 44 66.6a94.6 94.6 0 0 0-9 7.52Z" opacity=".2"/><path d="M136 24a103.8 103.8 0 0 0-73 30a8 8 0 0 0 11.3 11.32A88 88 0 1 1 63.06 190a8 8 0 0 0-12.12 10.44A104 104 0 1 0 136 24m59.32 55.72a8 8 0 0 0-11.32 11.32L192 99H160a8 8 0 0 0 0 16h48a8 8 0 0 0 8-8V59a8 8 0 0 0-16 0v10.34Z"/></g></svg>
    </button>
  </div>
  <div class="es__track">
    <span class="es__fill" id="esFill"></span>
  </div>
  <div class="es__bar">
    <span class="es__meta">ProgressEvent · AbortController</span>
  </div>
</div>
</main>

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

// 실패 흔들림과 재시도(07) — 흔들림은 translateX keyframes 뿐이다. 실패 시점의 채움 폭은
// 그대로 유지되고(scaleX 를 0 으로 되돌리지 않는다), 재시도는 그 폭에서 이어서 채워진다.

@include stage($stage-orange);

$es-text: $subject-ink;
$es-fill: $subject-ink;
$es-warn: $error;

$duration: $dur-loop;
$easing: $ease-out;
$color: $es-fill;

.es {
  display: flex; flex-direction: column; gap: $sp-3;
  width: 100%; height: 100%; min-height: 164px;
  justify-content: center;
}
.es:focus-visible { outline: 2px solid $es-text; outline-offset: 3px; border-radius: $r-control; }

.es__row { display: flex; align-items: center; gap: $sp-2; }

.es__label {
  position: relative;
  flex: 1;
  height: 14px;
  font-weight: 600; font-size: 11px; line-height: 1.3;
}
.es__label b {
  position: absolute; inset: 0;
  font-weight: 600;
  color: rgba($es-text, .82);
  opacity: 0;
}
.es__label-run { opacity: 1 !important; }
.es.is-error .es__label-run { opacity: 0 !important; }
.es.is-error .es__label-err { opacity: 1 !important; color: $es-warn !important; }

.es__warn {
  display: flex;
  color: $es-warn;
  opacity: 0;
  transform: scale(.6);
}
.es.is-error .es__warn { opacity: 1; transform: scale(1); transition: opacity $dur-quick $ease-out, transform $dur-quick $ease-elastic; }

.es__retry {
  display: flex; align-items: center; justify-content: center;
  width: 22px; height: 22px;
  border: 0; border-radius: $r-pill;
  background: rgba($es-text, .12);
  color: $es-text;
  opacity: 0;
  transform: scale(.6);
  cursor: pointer;
  padding: 0;
}
.es.is-error .es__retry { opacity: 1; transform: scale(1); transition: opacity $dur-quick $ease-out, transform $dur-quick $ease-elastic; }

.es__track {
  position: relative;
  height: $sp-2;
  border-radius: $r-pill;
  background: rgba($es-text, .14);
  overflow: hidden;
}
.es__fill {
  position: absolute; inset: 0;
  transform-origin: left center;
  transform: scaleX(0);
  border-radius: $r-pill;
  background: $es-fill;
}
.es.is-error .es__track { animation: esShake $dur-enter $ease-out 1; }

.es__bar { display: flex; justify-content: flex-end; }
.es__meta { font-weight: 500; font-size: 10px; color: rgba($es-text, .6); }

@keyframes esShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(5px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(2px); }
}

// ── 데모 루프 — 58% 까지 채우고 실패, 흔들리고, 남은 폭에서 이어 채워 완료한다 ──
@keyframes esFillLoop {
  0%   { transform: scaleX(0); }
  30%  { transform: scaleX(.58); }
  46%  { transform: scaleX(.58); }
  74%  { transform: scaleX(1); }
  86%  { transform: scaleX(1); }
  92%, 100% { transform: scaleX(0); }
}
@keyframes esTrackShake {
  0%, 30% { transform: translateX(0); }
  34% { transform: translateX(-6px); }
  38% { transform: translateX(5px); }
  41% { transform: translateX(-3px); }
  44%, 100% { transform: translateX(0); }
}
@keyframes esWarnLoop {
  0%, 31%  { opacity: 0; transform: scale(.6); }
  36%      { opacity: 1; transform: scale(1); animation-timing-function: $ease-elastic; }
  46%      { opacity: 1; transform: scale(1); }
  50%, 100% { opacity: 0; transform: scale(.6); }
}
@keyframes esLabelSwap {
  0%, 30% { opacity: 1; }
  31%, 49% { opacity: 0; }
  50%, 100% { opacity: 1; }
}
@keyframes esLabelErrSwap {
  0%, 30% { opacity: 0; }
  31%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

.is-demo .es__fill { animation: esFillLoop $duration $easing infinite; }
.is-demo .es__track { animation: esTrackShake $duration linear infinite; }
.is-demo .es__warn, .is-demo .es__retry { animation: esWarnLoop $duration linear infinite; }
.is-demo .es__label-run { animation: esLabelSwap $duration linear infinite; }
.is-demo .es__label-err { animation: esLabelErrSwap $duration linear infinite; color: $es-warn; }

@media (max-width: 340px) {
  .es__retry { width: 20px; height: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  .is-demo .es__fill, .is-demo .es__track, .is-demo .es__warn, .is-demo .es__retry,
  .is-demo .es__label-run, .is-demo .es__label-err { animation: none !important; }
  .is-demo .es__fill { transform: scaleX(.58) !important; }
}

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);
}

.es {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  height: 100%;
  min-height: 164px;
  justify-content: center;
}

.es:focus-visible {
  outline: 2px solid #17141a;
  outline-offset: 3px;
  border-radius: 12px;
}

.es__row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.es__label {
  position: relative;
  flex: 1;
  height: 14px;
  font-weight: 600;
  font-size: 11px;
  line-height: 1.3;
}

.es__label b {
  position: absolute;
  inset: 0;
  font-weight: 600;
  color: rgba(23, 20, 26, 0.82);
  opacity: 0;
}

.es__label-run {
  opacity: 1 !important;
}

.es.is-error .es__label-run {
  opacity: 0 !important;
}

.es.is-error .es__label-err {
  opacity: 1 !important;
  color: #c2361a !important;
}

.es__warn {
  display: flex;
  color: #c2361a;
  opacity: 0;
  transform: scale(0.6);
}

.es.is-error .es__warn {
  opacity: 1;
  transform: scale(1);
  transition: opacity 220ms ease-out, transform 220ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.es__retry {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border: 0;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.12);
  color: #17141a;
  opacity: 0;
  transform: scale(0.6);
  cursor: pointer;
  padding: 0;
}

.es.is-error .es__retry {
  opacity: 1;
  transform: scale(1);
  transition: opacity 220ms ease-out, transform 220ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.es__track {
  position: relative;
  height: 8px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.14);
  overflow: hidden;
}

.es__fill {
  position: absolute;
  inset: 0;
  transform-origin: left center;
  transform: scaleX(0);
  border-radius: 999px;
  background: #17141a;
}

.es.is-error .es__track {
  animation: esShake 600ms ease-out 1;
}

.es__bar {
  display: flex;
  justify-content: flex-end;
}

.es__meta {
  font-weight: 500;
  font-size: 10px;
  color: rgba(23, 20, 26, 0.6);
}

@keyframes esShake {
  0%, 100% {
    transform: translateX(0);
  }
  20% {
    transform: translateX(-6px);
  }
  40% {
    transform: translateX(5px);
  }
  60% {
    transform: translateX(-3px);
  }
  80% {
    transform: translateX(2px);
  }
}
@keyframes esFillLoop {
  0% {
    transform: scaleX(0);
  }
  30% {
    transform: scaleX(0.58);
  }
  46% {
    transform: scaleX(0.58);
  }
  74% {
    transform: scaleX(1);
  }
  86% {
    transform: scaleX(1);
  }
  92%, 100% {
    transform: scaleX(0);
  }
}
@keyframes esTrackShake {
  0%, 30% {
    transform: translateX(0);
  }
  34% {
    transform: translateX(-6px);
  }
  38% {
    transform: translateX(5px);
  }
  41% {
    transform: translateX(-3px);
  }
  44%, 100% {
    transform: translateX(0);
  }
}
@keyframes esWarnLoop {
  0%, 31% {
    opacity: 0;
    transform: scale(0.6);
  }
  36% {
    opacity: 1;
    transform: scale(1);
    animation-timing-function: cubic-bezier(0.34, 1.56, 0.64, 1);
  }
  46% {
    opacity: 1;
    transform: scale(1);
  }
  50%, 100% {
    opacity: 0;
    transform: scale(0.6);
  }
}
@keyframes esLabelSwap {
  0%, 30% {
    opacity: 1;
  }
  31%, 49% {
    opacity: 0;
  }
  50%, 100% {
    opacity: 1;
  }
}
@keyframes esLabelErrSwap {
  0%, 30% {
    opacity: 0;
  }
  31%, 49% {
    opacity: 1;
  }
  50%, 100% {
    opacity: 0;
  }
}
.is-demo .es__fill {
  animation: esFillLoop 2s ease-out infinite;
}

.is-demo .es__track {
  animation: esTrackShake 2s linear infinite;
}

.is-demo .es__warn, .is-demo .es__retry {
  animation: esWarnLoop 2s linear infinite;
}

.is-demo .es__label-run {
  animation: esLabelSwap 2s linear infinite;
}

.is-demo .es__label-err {
  animation: esLabelErrSwap 2s linear infinite;
  color: #c2361a;
}

@media (max-width: 340px) {
  .es__retry {
    width: 20px;
    height: 20px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .is-demo .es__fill, .is-demo .es__track, .is-demo .es__warn, .is-demo .es__retry,
  .is-demo .es__label-run, .is-demo .es__label-err {
    animation: none !important;
  }
  .is-demo .es__fill {
    transform: scaleX(0.58) !important;
  }
}

// 실패 흔들림과 재시도 — error 이벤트가 오면 그 시점의 loaded 값을 남긴 채 바가 흔들리고,
// 재시도는 AbortController 로 이전 시도를 끊은 뒤 처음부터가 아니라 남은 바이트만 이어 보낸다.
(function () {
  var SEED = 0x44c1e0;
  function mulberry32(a) {
    return function () {
      a |= 0; a = (a + 0x6D2B79F5) | 0;
      var t = Math.imul(a ^ (a >>> 15), 1 | a);
      t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
      return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
    };
  }
  var rand = mulberry32(SEED);
  var FAIL_AT = 58;

  var root  = document.getElementById('esRoot');
  var fill  = document.getElementById('esFill');
  var label = document.getElementById('esLabel');
  var retry = document.getElementById('esRetry');
  if (!root || !fill || !label || !retry) return;

  var bus = new EventTarget();
  var loaded = 0, failedOnce = false, controller = new AbortController(), timer = null;

  bus.addEventListener('progress', function (e) {
    fill.style.transform = 'scaleX(' + (e.loaded / 100) + ')';
  });
  bus.addEventListener('error', function (e) {
    root.classList.add('is-error');
  });

  function run(startAt) {
    loaded = startAt;
    controller = new AbortController();
    timer = setInterval(function () {
      if (controller.signal.aborted) return;
      loaded = Math.min(100, loaded + 4 + rand() * 8);
      if (!failedOnce && loaded >= FAIL_AT) {
        failedOnce = true;
        clearInterval(timer);
        bus.dispatchEvent(new ProgressEvent('error', { lengthComputable: true, loaded: loaded, total: 100 }));
        return;
      }
      bus.dispatchEvent(new ProgressEvent('progress', { lengthComputable: true, loaded: loaded, total: 100 }));
      if (loaded >= 100) clearInterval(timer);
    }, 220);
  }

  retry.addEventListener('click', function () {
    controller.abort();
    root.classList.remove('is-error');
    run(loaded);
  });
  function live() {
    if (!root.classList.contains('is-demo')) return;
    root.classList.remove('is-demo');
    run(0);
  }
  ['pointerdown', 'focusin'].forEach(function (ev) { root.addEventListener(ev, live); });
})();

// UploadProgressErrorShakeRetry — vanilla 판(run/329/demo/07-upload-progress-error-shake-retry/index.html) 의 React 포트.
// error 이벤트가 오면 그 시점의 loaded 값을 남긴 채 바가 흔들리고, 재시도는 AbortController 로
// 이전 시도를 끊은 뒤 처음부터가 아니라 남은 바이트만 이어 보낸다(scaleX 를 0 으로 되돌리지 않는다).
import { useEffect, useRef, useState } from "react";
import type { CSSProperties } from "react";
import styles from "./UploadProgressErrorShakeRetry.module.scss";

export type UploadProgressErrorShakeRetryProps = {
  duration?: string;
  easing?: string;
  color?: string;
  seed?: number;     // mulberry32 시드
  failAt?: number;   // 이 loaded 값(%) 에서 한 번 실패한다
  stepBase?: number; // 매 틱 기본 증가분(퍼센트 포인트)
  stepJitter?: number; // 매 틱 랜덤 증가분 상한
  tickMs?: number;   // 진행 틱 주기(ms)
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
type Box<T> = { current: T };

const LABEL_RUN = "전송 중";
const LABEL_ERR = "전송 실패";
const RETRY_LABEL = "업로드 재시도";
const META = "ProgressEvent · AbortController";
const SEED = 0x44c1e0;
const FAIL_AT = 58;

function mulberry32(a: number): () => number {
  return function () {
    a |= 0; a = (a + 0x6D2B79F5) | 0;
    const t = Math.imul(a ^ (a >>> 15), 1 | a);
    const u = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
    return ((u ^ (u >>> 14)) >>> 0) / 4294967296;
  };
}

export default function UploadProgressErrorShakeRetry({
  duration = "2s",
  easing = "ease-out",
  color = "#17141a",
  seed = SEED,
  failAt = FAIL_AT,
  stepBase = 4,
  stepJitter = 8,
  tickMs = 220
}: UploadProgressErrorShakeRetryProps) {
  const [demo, setDemo] = useState(true);
  const [isError, setIsError] = useState(false);
  const fillRef = useRef<HTMLSpanElement | null>(null);
  const randRef = useRef<(() => number) | null>(null);
  const loadedRef = useRef(0) as Box<number>;
  const failedOnceRef = useRef(false) as Box<boolean>;
  const timerRef = useRef(0) as Box<number>;
  const controllerRef = useRef<AbortController | null>(null);
  const vars: Vars = { "--duration": duration, "--easing": easing, "--color": color };

  useEffect(() => {
    return () => {
      window.clearInterval(timerRef.current);
      if (controllerRef.current) controllerRef.current.abort();
    };
  }, []);

  function paint(loaded: number): void {
    if (fillRef.current) fillRef.current.style.transform = "scaleX(" + (loaded / 100) + ")";
  }

  function run(startAt: number): void {
    loadedRef.current = startAt;
    const controller = new AbortController();
    controllerRef.current = controller;
    const rand = randRef.current!;
    timerRef.current = window.setInterval(() => {
      if (controller.signal.aborted) return;
      loadedRef.current = Math.min(100, loadedRef.current + stepBase + rand() * stepJitter);
      if (!failedOnceRef.current && loadedRef.current >= failAt) {
        failedOnceRef.current = true;
        window.clearInterval(timerRef.current);
        setIsError(true);
        return;
      }
      paint(loadedRef.current);
      if (loadedRef.current >= 100) window.clearInterval(timerRef.current);
    }, tickMs);
  }

  function onRetry(): void {
    if (controllerRef.current) controllerRef.current.abort();
    setIsError(false);
    run(loadedRef.current);
  }

  function live(): void {
    if (!demo) return;
    setDemo(false);
    randRef.current = mulberry32(seed);
    failedOnceRef.current = false;
    run(0);
  }

  const rootCls = [styles.es, demo ? styles.isDemo : "", isError ? styles.isError : ""].filter(Boolean).join(" ");

  return (
    <main className={styles.stage}>
      <div
        className={rootCls}
        style={vars}
        role="group"
        tabIndex={0}
        aria-label="파일 업로드 전송 실패와 재시도"
        onPointerDown={live}
        onFocus={live}
      >
        <div className={styles.row}>
          <span className={styles.label}>
            <b className={styles.labelRun}>{LABEL_RUN}</b>
            <b className={styles.labelErr}>{LABEL_ERR}</b>
          </span>
          <span className={styles.warn} aria-hidden="true">
            <svg viewBox="0 0 256 256" width="14" height="14"><g fill="currentColor"><path d="M236 128a108 108 0 1 1-108-108a108 108 0 0 1 108 108" opacity=".2"/><path d="M128 24a104 104 0 1 0 104 104A104.11 104.11 0 0 0 128 24m0 192a88 88 0 1 1 88-88a88.1 88.1 0 0 1-88 88m-8-80V80a8 8 0 0 1 16 0v56a8 8 0 0 1-16 0m20 36a12 12 0 1 1-12-12a12 12 0 0 1 12 12"/></g></svg>
          </span>
          <button
            className={styles.retry}
            type="button"
            aria-label={RETRY_LABEL}
            onClick={onRetry}
          >
            <svg viewBox="0 0 256 256" width="14" height="14"><g fill="currentColor"><path d="M197.67 186.37a94.06 94.06 0 0 1-66.79 27.66a93 93 0 0 1-11-.65a94.19 94.19 0 0 1-82.14-71.71a8 8 0 0 1 15.53-3.8a78.19 78.19 0 0 0 68.17 59.63a78 78 0 0 0 64.16-26.4a8 8 0 0 1 12.07 10.5Zm38.24-66.14a8 8 0 0 0-9.6 6.06a78 78 0 0 1-27.68 41.72a8 8 0 1 0 9.66 12.76a94.06 94.06 0 0 0 33.31-50.24a94.19 94.19 0 0 0-52.71-98.86a8 8 0 0 0-6.9 14.44a78 78 0 0 1 44 66.6a94.6 94.6 0 0 0-9 7.52Z" opacity=".2"/><path d="M136 24a103.8 103.8 0 0 0-73 30a8 8 0 0 0 11.3 11.32A88 88 0 1 1 63.06 190a8 8 0 0 0-12.12 10.44A104 104 0 1 0 136 24m59.32 55.72a8 8 0 0 0-11.32 11.32L192 99H160a8 8 0 0 0 0 16h48a8 8 0 0 0 8-8V59a8 8 0 0 0-16 0v10.34Z"/></g></svg>
          </button>
        </div>
        <div className={styles.track}>
          <span className={styles.fill} ref={fillRef}></span>
        </div>
        <div className={styles.bar}>
          <span className={styles.meta}>{META}</span>
        </div>
      </div>
    </main>
  );
}