06順番の値に沿って広がる全既読処理

<main class="stage">
  <div class="ma is-demo" id="ma">
    <div class="ma__head">
      <span class="ma__headLabel">通知 <span id="maCount">5</span></span>
      <button class="ma__all" id="maAllBtn" type="button">
        <svg class="ma__checkIc" viewBox="0 0 256 256" aria-hidden="true" focusable="false">
          <g fill="currentColor">
            <path opacity=".2" d="M232 56v144a16 16 0 0 1-16 16H40a16 16 0 0 1-16-16V56a16 16 0 0 1 16-16h176a16 16 0 0 1 16 16"/>
            <path d="m205.66 85.66l-96 96a8 8 0 0 1-11.32 0l-40-40a8 8 0 0 1 11.32-11.32L104 164.69l90.34-90.35a8 8 0 0 1 11.32 11.32"/>
          </g>
        </svg>
        すべて既読
      </button>
    </div>
    <ul class="ma__list" id="maList" role="list"></ul>
    <p class="ma__sr" id="maSr" aria-live="polite"></p>
  </div>
</main>

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

// 계산 겹: index.html markAllRead() 가 항목 순번(index) x NOTIF_MARK_ALL_STAGGER_MS 를
// 각 점의 transitionDelay 로 걸어두고 한꺼번에 목표 상태(채운 점 → 빈 원)를 바꾼다 —
// 항목 수가 늘어나면 번지는 데 걸리는 전체 시간도 그만큼 늘어난다.
.stage { @include stage($stage-yellow); }

.ma {
  width: min(100%, 300px);
  background: $subject-ink;
  border-radius: $r-card;
  padding: $sp-4;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  gap: $sp-3;
}

.ma__head { display: flex; align-items: center; justify-content: space-between; gap: $sp-2; }
.ma__headLabel { font-size: 13px; font-weight: 700; color: $subject-cream; }

.ma__all {
  display: flex;
  align-items: center;
  gap: $sp-1;
  border: none;
  background: $subject-blue-deep;
  color: $subject-cream;
  font-size: 11px;
  border-radius: $r-pill;
  padding: $sp-1 $sp-3;
  cursor: pointer;
}
.ma__checkIc { width: 12px; height: 12px; }

.ma__list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: $sp-2; }

.ma__item {
  position: relative;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: $sp-2;
  padding-left: $sp-2;
  border-left: 3px solid $subject-blue-light;
  border-radius: $r-sm;
  transition: border-left-width $dur-quick $ease-out;
}

// 계산 겹: index.html markAllRead()/resetAll() 이 점(fill·ring)에 거는 것과 같은 순번×간격
// transitionDelay 를 이 톤·좌측 굵기에도 건다 — 캐스케이드가 점 하나가 아니라 행 전체로 보인다.
.ma__itemTint {
  position: absolute;
  inset: 0;
  border-radius: $r-sm;
  background: $subject-blue-light;
  opacity: .12;
  pointer-events: none;
  transition: opacity $dur-quick $ease-out;
}

.ma__dot { position: relative; z-index: 1; width: 13px; height: 13px; flex: 0 0 auto; }
.ma__dotFill,
.ma__dotRing {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  box-sizing: border-box;
  transition: opacity $dur-quick $ease-out, border-width $dur-quick $ease-out;
}
.ma__dotFill { background: $subject-blue-light; opacity: 1; }
.ma__dotRing { border: 0 solid $subject-blue-light; }

.ma__name { position: relative; z-index: 1; font-size: 12px; color: $subject-cream; }

.ma__sr {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); margin: -1px; padding: 0; border: 0;
}

@media (max-width: 340px) {
  .ma { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  .ma__dotFill,
  .ma__dotRing { transition: none; }
  .ma__item { transition: none; }
  .ma__itemTint { transition: none; }
}

.stage html, .stage body {
  margin: 0;
  overflow: hidden;
}
.stage .stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.ma {
  width: min(100%, 300px);
  background: #17141a;
  border-radius: 16px;
  padding: 16px;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ma__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.ma__headLabel {
  font-size: 13px;
  font-weight: 700;
  color: #fff7e6;
}

.ma__all {
  display: flex;
  align-items: center;
  gap: 4px;
  border: none;
  background: #0a4fe8;
  color: #fff7e6;
  font-size: 11px;
  border-radius: 999px;
  padding: 4px 12px;
  cursor: pointer;
}

.ma__checkIc {
  width: 12px;
  height: 12px;
}

.ma__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ma__item {
  position: relative;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: 8px;
  padding-left: 8px;
  border-left: 3px solid #5b8cf8;
  border-radius: 8px;
  transition: border-left-width 220ms ease-out;
}

.ma__itemTint {
  position: absolute;
  inset: 0;
  border-radius: 8px;
  background: #5b8cf8;
  opacity: 0.12;
  pointer-events: none;
  transition: opacity 220ms ease-out;
}

.ma__dot {
  position: relative;
  z-index: 1;
  width: 13px;
  height: 13px;
  flex: 0 0 auto;
}

.ma__dotFill,
.ma__dotRing {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  box-sizing: border-box;
  transition: opacity 220ms ease-out, border-width 220ms ease-out;
}

.ma__dotFill {
  background: #5b8cf8;
  opacity: 1;
}

.ma__dotRing {
  border: 0 solid #5b8cf8;
}

.ma__name {
  position: relative;
  z-index: 1;
  font-size: 12px;
  color: #fff7e6;
}

.ma__sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  margin: -1px;
  padding: 0;
  border: 0;
}

@media (max-width: 340px) {
  .ma {
    width: 100%;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ma__dotFill,
  .ma__dotRing {
    transition: none;
  }
  .ma__item {
    transition: none;
  }
  .ma__itemTint {
    transition: none;
  }
}

(function () {
  "use strict";

  var NOTIF_MARK_ALL_STAGGER_MS = 70; // 모두 읽음을 눌렀을 때 항목 순번마다 이 값씩 늦게 번진다

  var NAMES = [
    "決済が承認されました", "新しいコメントが付きました", "会議まであと10分です",
    "アップロードが完了しました", "招待状が届きました"
  ];

  var root = document.getElementById("ma");
  var list = document.getElementById("maList");
  var sr = document.getElementById("maSr");
  var countEl = document.getElementById("maCount");
  var allBtn = document.getElementById("maAllBtn");
  var reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;

  var synthetic = false;
  function human() {
    if (synthetic) return;
    if (root.classList.contains("is-demo")) root.classList.remove("is-demo");
  }

  var rows = [];

  NAMES.forEach(function (name, i) {
    var li = document.createElement("li");
    li.className = "ma__item";
    li.setAttribute("role", "listitem");

    var tint = document.createElement("span");
    tint.className = "ma__itemTint";
    tint.setAttribute("aria-hidden", "true");

    var dot = document.createElement("span");
    dot.className = "ma__dot";
    var fill = document.createElement("span");
    fill.className = "ma__dotFill";
    var ring = document.createElement("span");
    ring.className = "ma__dotRing";
    dot.appendChild(fill);
    dot.appendChild(ring);

    var nameEl = document.createElement("span");
    nameEl.className = "ma__name";
    nameEl.textContent = name;

    li.appendChild(tint);
    li.appendChild(dot);
    li.appendChild(nameEl);
    list.appendChild(li);
    rows.push({ li: li, tint: tint, fill: fill, ring: ring, read: false });
  });

  function updateCount() {
    var unread = rows.filter(function (r) { return !r.read; }).length;
    countEl.textContent = String(unread);
  }

  function resetAll() {
    rows.forEach(function (r) {
      r.read = false;
      r.fill.style.transitionDelay = "0ms";
      r.ring.style.transitionDelay = "0ms";
      r.tint.style.transitionDelay = "0ms";
      r.li.style.transitionDelay = "0ms";
      r.fill.style.opacity = "1";
      r.ring.style.borderWidth = "0px";
      r.tint.style.opacity = ".12";
      r.li.style.borderLeftWidth = "3px";
    });
    updateCount();
  }

  // 계산 겹: 각 항목의 순번(index)에 NOTIF_MARK_ALL_STAGGER_MS 를 곱한 값을 그 항목의
  // transitionDelay 로 걸어둔 뒤 한꺼번에 목표 상태를 바꾼다 — 항목 수가 늘면 번지는 시간도
  // 그만큼 함께 늘어난다(하드코딩된 총 시간이 아니라 항목 수 x 간격으로 계산한다). 같은 지연값을
  // 행 톤(tint)·좌측 굵기(border-left)에도 걸어 점 하나가 아니라 행 전체가 캐스케이드로 보인다.
  function markAllRead() {
    rows.forEach(function (r, i) {
      if (r.read) return;
      var delay = reduce ? 0 : i * NOTIF_MARK_ALL_STAGGER_MS;
      r.fill.style.transitionDelay = delay + "ms";
      r.ring.style.transitionDelay = delay + "ms";
      r.tint.style.transitionDelay = delay + "ms";
      r.li.style.transitionDelay = delay + "ms";
      r.read = true;
      r.fill.style.opacity = "0";
      r.ring.style.borderWidth = "2.4px";
      r.tint.style.opacity = "0";
      r.li.style.borderLeftWidth = "0px";
    });
    updateCount();
    sr.textContent = "すべて既読にしました";
  }

  allBtn.addEventListener("click", function () {
    human();
    markAllRead();
  });
  allBtn.addEventListener("keydown", function (e) {
    if (e.key === "Enter" || e.key === " ") {
      e.preventDefault();
      human();
      markAllRead();
    }
  });

  if (reduce) {
    markAllRead();
  } else {
    var phase = "mark";
    function loop() {
      if (!root.classList.contains("is-demo")) return;
      synthetic = true;
      if (phase === "mark") {
        markAllRead();
        phase = "reset";
        window.setTimeout(loop, rows.length * NOTIF_MARK_ALL_STAGGER_MS + 550);
      } else {
        resetAll();
        phase = "mark";
        window.setTimeout(loop, 700);
      }
      synthetic = false;
    }
    window.setTimeout(loop, 350);
  }
})();

// NotifMarkAllReadCascade — vanilla 판(run/405/demo/06-.../index.html) 의 React 포트.
// 계산 겹: 각 항목의 순번(index)에 NOTIF_MARK_ALL_STAGGER_MS 를 곱한 값을 그 항목의
// transitionDelay 로 걸어둔 뒤 한꺼번에 목표 상태를 바꾼다 — 항목 수가 늘면 번지는 시간도
// 그만큼 함께 늘어난다(하드코딩된 총 시간이 아니라 항목 수 x 간격으로 계산한다).
import { useEffect, useRef, useState } from "react";
import styles from "./NotifMarkAllReadCascade.module.scss";

type Box<T> = { current: T };
type KeyEvt = { key: string; preventDefault(): void };

const NOTIF_MARK_ALL_STAGGER_MS = 70; // 모두 읽음을 눌렀을 때 항목 순번마다 이 값씩 늦게 번진다

const NAMES = [
  "결제가 승인됐어요", "새 댓글이 달렸어요", "회의 10분 전이에요",
  "업로드가 끝났어요", "초대장이 도착했어요",
];

type Row = { li: HTMLLIElement; tint: HTMLElement; fill: HTMLElement; ring: HTMLElement; read: boolean };

export default function NotifMarkAllReadCascade() {
  const [isDemo, setIsDemo] = useState(true);

  const isDemoRef = useRef(true) as unknown as Box<boolean>;
  const synthRef = useRef(false) as unknown as Box<boolean>;
  const rootRef = useRef(null) as unknown as Box<HTMLDivElement>;
  const listRef = useRef(null) as unknown as Box<HTMLUListElement>;
  const srRef = useRef(null) as unknown as Box<HTMLParagraphElement>;
  const countRef = useRef(null) as unknown as Box<HTMLSpanElement>;
  const rowsRef = useRef([] as Row[]) as unknown as Box<Row[]>;
  const reduceRef = useRef(false) as unknown as Box<boolean>;
  const loopTimerRef = useRef(0) as unknown as Box<number>;

  function human() {
    if (synthRef.current) return;
    if (isDemoRef.current) { isDemoRef.current = false; setIsDemo(false); }
  }

  function updateCount() {
    const unread = rowsRef.current.filter((r) => !r.read).length;
    if (countRef.current) countRef.current.textContent = String(unread);
  }

  function resetAll() {
    rowsRef.current.forEach((r) => {
      r.read = false;
      r.fill.style.transitionDelay = "0ms";
      r.ring.style.transitionDelay = "0ms";
      r.tint.style.transitionDelay = "0ms";
      r.li.style.transitionDelay = "0ms";
      r.fill.style.opacity = "1";
      r.ring.style.borderWidth = "0px";
      r.tint.style.opacity = ".12";
      r.li.style.borderLeftWidth = "3px";
    });
    updateCount();
  }

  // 계산 겹: 각 항목의 순번(index)에 NOTIF_MARK_ALL_STAGGER_MS 를 곱한 값을 그 항목의
  // transitionDelay 로 걸어둔 뒤 한꺼번에 목표 상태를 바꾼다. 같은 지연값을 행 톤(tint)·좌측
  // 굵기(border-left)에도 걸어 점 하나가 아니라 행 전체가 캐스케이드로 보인다.
  function markAllRead() {
    const reduce = reduceRef.current;
    rowsRef.current.forEach((r, i) => {
      if (r.read) return;
      const delay = reduce ? 0 : i * NOTIF_MARK_ALL_STAGGER_MS;
      r.fill.style.transitionDelay = delay + "ms";
      r.ring.style.transitionDelay = delay + "ms";
      r.tint.style.transitionDelay = delay + "ms";
      r.li.style.transitionDelay = delay + "ms";
      r.read = true;
      r.fill.style.opacity = "0";
      r.ring.style.borderWidth = "2.4px";
      r.tint.style.opacity = "0";
      r.li.style.borderLeftWidth = "0px";
    });
    updateCount();
    if (srRef.current) srRef.current.textContent = "모두 읽음으로 표시했습니다";
  }

  function onAllClick() {
    human();
    markAllRead();
  }

  function onAllKeyDown(e: KeyEvt) {
    if (e.key === "Enter" || e.key === " ") {
      e.preventDefault();
      human();
      markAllRead();
    }
  }

  useEffect(() => {
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    reduceRef.current = reduce;
    const list = listRef.current;
    if (!list) return;

    const rows: Row[] = [];
    NAMES.forEach((name) => {
      const li = document.createElement("li");
      li.className = styles.item;
      li.setAttribute("role", "listitem");

      const tint = document.createElement("span");
      tint.className = styles.itemTint;
      tint.setAttribute("aria-hidden", "true");

      const dot = document.createElement("span");
      dot.className = styles.dot;
      const fill = document.createElement("span");
      fill.className = styles.dotFill;
      const ring = document.createElement("span");
      ring.className = styles.dotRing;
      dot.appendChild(fill);
      dot.appendChild(ring);

      const nameEl = document.createElement("span");
      nameEl.className = styles.name;
      nameEl.textContent = name;

      li.appendChild(tint);
      li.appendChild(dot);
      li.appendChild(nameEl);
      list.appendChild(li);
      rows.push({ li, tint, fill, ring, read: false });
    });
    rowsRef.current = rows;
    updateCount();

    if (reduce) {
      markAllRead();
    } else {
      let phase = "mark";
      function loop() {
        if (!isDemoRef.current) return;
        synthRef.current = true;
        if (phase === "mark") {
          markAllRead();
          phase = "reset";
          loopTimerRef.current = window.setTimeout(loop, rowsRef.current.length * NOTIF_MARK_ALL_STAGGER_MS + 550);
        } else {
          resetAll();
          phase = "mark";
          loopTimerRef.current = window.setTimeout(loop, 700);
        }
        synthRef.current = false;
      }
      loopTimerRef.current = window.setTimeout(loop, 350);
    }

    return () => { window.clearTimeout(loopTimerRef.current); };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  return (
    <main className={styles.stage}>
      <div className={styles.ma + " " + (isDemo ? styles.isDemo : "")} ref={rootRef}>
        <div className={styles.head}>
          <span className={styles.headLabel}>알림 <span ref={countRef}>5</span></span>
          <button className={styles.all} type="button" onClick={onAllClick} onKeyDown={onAllKeyDown}>
            <svg className={styles.checkIc} viewBox="0 0 256 256" aria-hidden="true" focusable="false">
              <g fill="currentColor">
                <path opacity=".2" d="M232 56v144a16 16 0 0 1-16 16H40a16 16 0 0 1-16-16V56a16 16 0 0 1 16-16h176a16 16 0 0 1 16 16" />
                <path d="m205.66 85.66l-96 96a8 8 0 0 1-11.32 0l-40-40a8 8 0 0 1 11.32-11.32L104 164.69l90.34-90.35a8 8 0 0 1 11.32 11.32" />
              </g>
            </svg>
            모두 읽음
          </button>
        </div>
        <ul className={styles.list} role="list" ref={listRef} />
        <p className={styles.sr} aria-live="polite" ref={srRef} />
      </div>
    </main>
  );
}