08Row stagger reveal — an effect where each list row appears following an order value once the refresh finishes

<main class="stage">
<div class="prsg is-demo" id="prsg">
  <div class="prsg__phone" id="prsgPhone">
    <div class="prsg__zone">
      <span class="prsg__disc" id="prsgDisc"></span>
    </div>
    <div class="prsg__list" id="prsgList">
      <div class="prsg__row"></div>
      <div class="prsg__row"></div>
      <div class="prsg__row"></div>
      <div class="prsg__row"></div>
      <div class="prsg__row"></div>
    </div>
  </div>
  <span class="prsg__hint" id="prsgHint">Pull down</span>
</div>
</main>

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

// 계산 겹(행마다 순번 * STAGGER_MS 지연)은 JS 에 있다 — 여기는 정적 배치만.
@include stage($stage-orange);

.prsg {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-3;
}

.prsg__phone {
  position: relative;
  width: 220px;
  height: 168px;
  overflow: hidden;
  border-radius: $r-card;
  background: $stage-paper;
  touch-action: none;
  cursor: grab;
}

.prsg__zone {
  position: relative;
  height: 34px;
  display: grid;
  place-items: center;
}

.prsg__disc {
  width: 20px;
  height: 20px;
  border-radius: $r-pill;
  background: rgba($subject-ink, .22);
  transition: background $dur-quick $ease-out;

  &--ready { background: $subject-blue-deep; }
  &--spin { animation: prsgSpin .6s linear infinite; }
}

@keyframes prsgSpin {
  from { transform: rotate(0deg) scale(1); }
  to { transform: rotate(360deg) scale(1); }
}

.prsg__list {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: $sp-2;
  padding: 0 $sp-4 $sp-3;
}

.prsg__row {
  height: 15px;
  border-radius: $r-xs;
  background: $subject-cream;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity $dur-base $ease-out, transform $dur-base $ease-out;

  &--in { opacity: 1; transform: translateY(0); }
}

.prsg__hint {
  color: $subject-ink;
  font-size: 12px;
  text-align: center;
}

@media (max-width: 340px) {
  .prsg__phone { width: 176px; height: 132px; }
  .prsg__zone { height: 28px; }
  .prsg__list { gap: $sp-1; padding: 0 $sp-3 $sp-2; }
  .prsg__row { height: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  .prsg__disc, .prsg__row { transition: none !important; animation: none !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);
}

.prsg {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.prsg__phone {
  position: relative;
  width: 220px;
  height: 168px;
  overflow: hidden;
  border-radius: 16px;
  background: #ffffff;
  touch-action: none;
  cursor: grab;
}

.prsg__zone {
  position: relative;
  height: 34px;
  display: grid;
  place-items: center;
}

.prsg__disc {
  width: 20px;
  height: 20px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.22);
  transition: background 220ms ease-out;
}
.prsg__disc--ready {
  background: #0a4fe8;
}
.prsg__disc--spin {
  animation: prsgSpin 0.6s linear infinite;
}

@keyframes prsgSpin {
  from {
    transform: rotate(0deg) scale(1);
  }
  to {
    transform: rotate(360deg) scale(1);
  }
}
.prsg__list {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 0 16px 12px;
}

.prsg__row {
  height: 15px;
  border-radius: 4px;
  background: #fff7e6;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 300ms ease-out, transform 300ms ease-out;
}
.prsg__row--in {
  opacity: 1;
  transform: translateY(0);
}

.prsg__hint {
  color: #17141a;
  font-size: 12px;
  text-align: center;
}

@media (max-width: 340px) {
  .prsg__phone {
    width: 176px;
    height: 132px;
  }
  .prsg__zone {
    height: 28px;
  }
  .prsg__list {
    gap: 4px;
    padding: 0 12px 8px;
  }
  .prsg__row {
    height: 12px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .prsg__disc, .prsg__row {
    transition: none !important;
    animation: none !important;
  }
}

(function () {
  var phone = document.getElementById('prsgPhone');
  var disc = document.getElementById('prsgDisc');
  var list = document.getElementById('prsgList');
  var hint = document.getElementById('prsgHint');
  var root = document.getElementById('prsg');
  var rows = list.querySelectorAll('.prsg__row');

  // 계산 겹: 새로고침이 끝난 뒤 각 행의 등장 지연은 STAGGER_MS * 행 순번 — 한 번의 CSS
  // animation-delay 로 걸지 않고 행마다 setTimeout 을 따로 걸어 순번 계산을 그대로 노출한다.
  var REF = 90, MAX = 130, STAGGER_MS = 90, LATENCY_MS = 420;

  var raw = 0, target = 0, raf = null;
  function apply(raw) {
    var pull = Math.min(raw, MAX) * 0.28;
    disc.style.transform = 'translateY(' + pull.toFixed(1) + 'px) scale(' + (0.7 + 0.3 * Math.min(1, raw / REF)).toFixed(2) + ')';
    disc.classList.toggle('prsg__disc--ready', raw >= REF);
    hint.textContent = raw >= REF ? 'Release to refresh' : (raw > 4 ? 'Pull more (' + Math.round(raw) + '/' + REF + 'px)' : 'Pull down');
  }
  function settle() {
    raw += (target - raw) * 0.3;
    if (Math.abs(target - raw) < 0.3) { raw = target; }
    apply(raw);
    if (raw !== target) { raf = requestAnimationFrame(settle); } else { raf = null; }
  }
  function goTo(v) { target = v; if (raf === null) { raf = requestAnimationFrame(settle); } }

  var timers = [];
  function clearTimers() { timers.forEach(clearTimeout); timers = []; }

  function refreshCycle() {
    disc.classList.add('prsg__disc--spin');
    hint.textContent = 'Refreshing';
    timers.push(setTimeout(function () {
      for (var i = 0; i < rows.length; i++) { rows[i].classList.remove('prsg__row--in'); }
      // 강제 리플로우 — 클래스를 뗀 상태를 브라우저가 실제로 반영하게 한다.
      void list.offsetHeight;
      for (var j = 0; j < rows.length; j++) {
        (function (idx) {
          timers.push(setTimeout(function () { rows[idx].classList.add('prsg__row--in'); }, idx * STAGGER_MS));
        })(j);
      }
      var totalDelay = (rows.length - 1) * STAGGER_MS + 260;
      timers.push(setTimeout(function () {
        disc.classList.remove('prsg__disc--spin', 'prsg__disc--ready');
        hint.textContent = 'Pull down';
        raw = 0; apply(0);
      }, totalDelay));
    }, LATENCY_MS));
  }

  var dragging = false, startY = 0, startRaw = 0, committing = false;
  function onDown(y) { if (committing) { return; } dragging = true; startY = y; startRaw = raw; if (raf) { cancelAnimationFrame(raf); raf = null; } }
  function onMove(y) {
    if (!dragging) { return; }
    raw = Math.max(0, Math.min(MAX, startRaw + (y - startY)));
    apply(raw);
  }
  function onUp() {
    if (!dragging) { return; }
    dragging = false;
    if (raw >= REF) {
      committing = true;
      refreshCycle();
      timers.push(setTimeout(function () { committing = false; }, LATENCY_MS + (rows.length - 1) * STAGGER_MS + 260));
    } else {
      goTo(0);
    }
  }

  function wireReal() {
    phone.addEventListener('pointerdown', function (e) { root.classList.remove('is-demo'); stopAutoplay(); onDown(e.clientY); });
    window.addEventListener('pointermove', function (e) { onMove(e.clientY); });
    window.addEventListener('pointerup', onUp);
  }
  phone.style.touchAction = 'none';
  wireReal();
  for (var k = 0; k < rows.length; k++) { rows[k].classList.add('prsg__row--in'); }
  apply(0);

  var autoRaw = 0, autoTimer = null;
  function autoTick() {
    if (committing) { return; }
    autoRaw += 18;
    if (autoRaw >= REF) {
      raw = REF; apply(raw); autoRaw = 0;
      committing = true;
      refreshCycle();
      timers.push(setTimeout(function () { committing = false; }, LATENCY_MS + (rows.length - 1) * STAGGER_MS + 260));
      return;
    }
    raw = autoRaw; apply(raw);
  }
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  function stopAutoplay() { if (autoTimer) { clearInterval(autoTimer); autoTimer = null; } clearTimers(); }
  if (!reduce) { autoTimer = setInterval(autoTick, 190); }
})();

import { useEffect, useRef } from "react";
import styles from "./PullRefreshRowStaggerReveal.module.scss";

export type PullRefreshRowStaggerRevealProps = {
  color?: string;
};

export default function PullRefreshRowStaggerReveal({
  color = "#0a4fe8",
}: PullRefreshRowStaggerRevealProps) {
  const rootRef = useRef<HTMLDivElement | null>(null);

  useEffect(() => {
    const root = rootRef.current;
    if (!root) return;
    const phone = root.querySelector<HTMLDivElement>(`.${styles.phone}`);
    const disc = root.querySelector<HTMLSpanElement>(`.${styles.disc}`);
    const list = root.querySelector<HTMLDivElement>(`.${styles.list}`);
    const hint = root.querySelector<HTMLSpanElement>(`.${styles.hint}`);
    if (!phone || !disc || !list || !hint) return;
    const rows = Array.from(root.querySelectorAll<HTMLDivElement>(`.${styles.row}`));

    // 계산 겹: 새로고침이 끝난 뒤 각 행의 등장 지연은 STAGGER_MS * 행 순번 — 한 번의 CSS
    // animation-delay 로 걸지 않고 행마다 setTimeout 을 따로 걸어 순번 계산을 그대로 노출한다.
    const REF = 90, MAX = 130, STAGGER_MS = 90, LATENCY_MS = 420;
    const readyClass = styles["disc--ready"];
    const spinClass = styles["disc--spin"];
    const inClass = styles["row--in"];

    let raw = 0, target = 0, raf: number | null = null;
    function apply(rawV: number) {
      const pull = Math.min(rawV, MAX) * 0.28;
      disc!.style.transform = "translateY(" + pull.toFixed(1) + "px) scale(" + (0.7 + 0.3 * Math.min(1, rawV / REF)).toFixed(2) + ")";
      disc!.classList.toggle(readyClass, rawV >= REF);
      hint!.textContent = rawV >= REF ? "놓으면 새로고침" : (rawV > 4 ? "더 당기세요 (" + Math.round(rawV) + "/" + REF + "px)" : "아래로 당기세요");
    }
    function settle() {
      raw += (target - raw) * 0.3;
      if (Math.abs(target - raw) < 0.3) raw = target;
      apply(raw);
      raf = raw !== target ? requestAnimationFrame(settle) : null;
    }
    function goTo(v: number) { target = v; if (raf === null) { raf = requestAnimationFrame(settle); } }

    let timers: number[] = [];
    function clearTimers() { timers.forEach((t) => window.clearTimeout(t)); timers = []; }

    function refreshCycle() {
      disc!.classList.add(spinClass);
      hint!.textContent = "새로고침 중";
      timers.push(window.setTimeout(() => {
        rows.forEach((row) => row.classList.remove(inClass));
        void list!.offsetHeight;
        rows.forEach((row, idx) => {
          timers.push(window.setTimeout(() => row.classList.add(inClass), idx * STAGGER_MS));
        });
        const totalDelay = (rows.length - 1) * STAGGER_MS + 260;
        timers.push(window.setTimeout(() => {
          disc!.classList.remove(spinClass, readyClass);
          hint!.textContent = "아래로 당기세요";
          raw = 0; apply(0);
        }, totalDelay));
      }, LATENCY_MS));
    }

    let dragging = false, startY = 0, startRaw = 0, committing = false;
    function onDown(y: number) {
      if (committing) return;
      dragging = true; startY = y; startRaw = raw;
      if (raf !== null) { cancelAnimationFrame(raf); raf = null; }
    }
    function onMove(y: number) {
      if (!dragging) return;
      raw = Math.max(0, Math.min(MAX, startRaw + (y - startY)));
      apply(raw);
    }
    function onUp() {
      if (!dragging) return;
      dragging = false;
      if (raw >= REF) {
        committing = true;
        refreshCycle();
        timers.push(window.setTimeout(() => { committing = false; }, LATENCY_MS + (rows.length - 1) * STAGGER_MS + 260));
      } else {
        goTo(0);
      }
    }

    function onPointerDown(e: PointerEvent) { stopAutoplay(); onDown(e.clientY); }
    function onPointerMove(e: PointerEvent) { onMove(e.clientY); }
    phone.style.touchAction = "none";
    phone.addEventListener("pointerdown", onPointerDown);
    window.addEventListener("pointermove", onPointerMove);
    window.addEventListener("pointerup", onUp);
    rows.forEach((row) => row.classList.add(inClass));
    apply(0);

    let autoRaw = 0, autoTimer: number | null = null;
    function autoTick() {
      if (committing) return;
      autoRaw += 18;
      if (autoRaw >= REF) {
        raw = REF; apply(raw); autoRaw = 0;
        committing = true;
        refreshCycle();
        timers.push(window.setTimeout(() => { committing = false; }, LATENCY_MS + (rows.length - 1) * STAGGER_MS + 260));
        return;
      }
      raw = autoRaw; apply(raw);
    }
    function stopAutoplay() {
      if (autoTimer !== null) { window.clearInterval(autoTimer); autoTimer = null; }
      clearTimers();
    }
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    if (!reduce) { autoTimer = window.setInterval(autoTick, 190); }

    return () => {
      stopAutoplay();
      if (raf !== null) cancelAnimationFrame(raf);
      phone.removeEventListener("pointerdown", onPointerDown);
      window.removeEventListener("pointermove", onPointerMove);
      window.removeEventListener("pointerup", onUp);
    };
  }, []);

  return (
    <div ref={rootRef} className={styles.stage}>
      <div className={styles.prsg}>
        <div className={styles.phone}>
          <div className={styles.zone}>
            <span className={styles.disc} style={{ "--accent": color } as any} />
          </div>
          <div className={styles.list}>
            <div className={styles.row} />
            <div className={styles.row} />
            <div className={styles.row} />
            <div className={styles.row} />
            <div className={styles.row} />
          </div>
        </div>
        <span className={styles.hint}>아래로 당기세요</span>
      </div>
    </div>
  );
}