06Tooltip label swap — the label text value beside the star changes to match the hovered star's order value

<main class="stage">
<div class="sr is-demo" id="sr">
  <div class="sr__tip" id="srTip">Average</div>
  <div class="sr__row" id="srRow">
    <span class="sr__star" data-i="1"><svg viewBox="0 0 24 24"><path d="M12 .587l3.668 7.568 8.332 1.151-6.064 5.828 1.48 8.279L12 19.771l-7.416 3.642 1.48-8.279-6.064-5.828 8.332-1.151z"/></svg></span>
    <span class="sr__star" data-i="2"><svg viewBox="0 0 24 24"><path d="M12 .587l3.668 7.568 8.332 1.151-6.064 5.828 1.48 8.279L12 19.771l-7.416 3.642 1.48-8.279-6.064-5.828 8.332-1.151z"/></svg></span>
    <span class="sr__star" data-i="3"><svg viewBox="0 0 24 24"><path d="M12 .587l3.668 7.568 8.332 1.151-6.064 5.828 1.48 8.279L12 19.771l-7.416 3.642 1.48-8.279-6.064-5.828 8.332-1.151z"/></svg></span>
    <span class="sr__star" data-i="4"><svg viewBox="0 0 24 24"><path d="M12 .587l3.668 7.568 8.332 1.151-6.064 5.828 1.48 8.279L12 19.771l-7.416 3.642 1.48-8.279-6.064-5.828 8.332-1.151z"/></svg></span>
    <span class="sr__star" data-i="5"><svg viewBox="0 0 24 24"><path d="M12 .587l3.668 7.568 8.332 1.151-6.064 5.828 1.48 8.279L12 19.771l-7.416 3.642 1.48-8.279-6.064-5.828 8.332-1.151z"/></svg></span>
  </div>
</div>
</main>

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

// 계산 겹: 별의 실제 렌더 중심 좌표(getBoundingClientRect)를 말풍선 translateX 값으로 옮기고,
// 인덱스 변경은 40ms 지연(debounce) 뒤에만 문구를 바꿔 스쳐 지나갈 때의 깜빡임을 막는다.
@include stage($stage-orange);

.sr {
  position: relative;
  display: grid;
  place-items: center;
  gap: $sp-8;
}

.sr__tip {
  position: absolute;
  top: 2px;
  left: 0;
  transform: translateX(0) translateX(-50%);
  background: $subject-ink;
  color: $stage-paper;
  padding: $sp-1 $sp-3;
  border-radius: $r-sm;
  font: 600 13px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  white-space: nowrap;
  opacity: 0;
  transition: opacity $dur-instant $ease-out, transform $dur-quick $ease-out;

  &::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: $subject-ink;
  }

  &--show { opacity: 1; }
}

.sr__row { display: flex; gap: $sp-2; margin-top: 40px; }

.sr__star {
  width: 40px;
  height: 40px;
  color: $subject-orange-deep;
  opacity: .45;
  transition: color $dur-quick $ease-out, opacity $dur-quick $ease-out;

  svg { display: block; width: 100%; height: 100%; fill: currentColor; }

  &--filled { color: $subject-blue-deep; opacity: 1; }
}

@media (max-width: 340px) {
  .sr__star { width: 32px; height: 32px; }
  .sr__row { gap: $sp-1; }
  .sr__tip { font-size: 12px; top: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .sr__tip, .sr__star { transition: none; }
}

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);
}

.sr {
  position: relative;
  display: grid;
  place-items: center;
  gap: 32px;
}

.sr__tip {
  position: absolute;
  top: 2px;
  left: 0;
  transform: translateX(0) translateX(-50%);
  background: #17141a;
  color: #ffffff;
  padding: 4px 12px;
  border-radius: 8px;
  font: 600 13px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 140ms ease-out, transform 220ms ease-out;
}
.sr__tip::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: #17141a;
}
.sr__tip--show {
  opacity: 1;
}

.sr__row {
  display: flex;
  gap: 8px;
  margin-top: 40px;
}

.sr__star {
  width: 40px;
  height: 40px;
  color: #c93000;
  opacity: 0.45;
  transition: color 220ms ease-out, opacity 220ms ease-out;
}
.sr__star svg {
  display: block;
  width: 100%;
  height: 100%;
  fill: currentColor;
}
.sr__star--filled {
  color: #0a4fe8;
  opacity: 1;
}

@media (max-width: 340px) {
  .sr__star {
    width: 32px;
    height: 32px;
  }
  .sr__row {
    gap: 4px;
  }
  .sr__tip {
    font-size: 12px;
    top: 32px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .sr__tip, .sr__star {
    transition: none;
  }
}

(function () {
  var root = document.getElementById('sr');
  var row = document.getElementById('srRow');
  var tip = document.getElementById('srTip');
  var stars = Array.prototype.slice.call(row.querySelectorAll('.sr__star'));
  var LABELS = { 1: 'Very poor', 2: 'Poor', 3: 'Average', 4: 'Good', 5: 'Excellent' };
  var pendingTimer = null;
  var shownIndex = 0;

  // 계산 겹: 별의 실제 렌더 위치(getBoundingClientRect 중심 x)를 말풍선의 translateX 값으로
  // 그대로 옮기고, 인덱스 변경은 짧은 지연(debounce)을 거친 뒤에만 이름표 문구를 바꾼다 —
  // 빠르게 스쳐 지나갈 때 문구가 매 별마다 깜빡이지 않게 하는 타이밍 계산이다.
  function positionTip(i) {
    var star = stars[i - 1];
    var sr = star.getBoundingClientRect();
    var rr = row.getBoundingClientRect();
    var cx = sr.left + sr.width / 2 - rr.left;
    tip.style.transform = 'translateX(' + cx.toFixed(1) + 'px) translateX(-50%)';
  }

  function commit(i) {
    shownIndex = i;
    tip.textContent = LABELS[i];
    positionTip(i);
    tip.classList.add('sr__tip--show');
    stars.forEach(function (s, idx) { s.classList.toggle('sr__star--filled', idx < i); });
  }

  function requestSwap(i) {
    if (pendingTimer) clearTimeout(pendingTimer);
    pendingTimer = setTimeout(function () { commit(i); }, 40);
  }

  function hide() {
    if (pendingTimer) { clearTimeout(pendingTimer); pendingTimer = null; }
    tip.classList.remove('sr__tip--show');
    stars.forEach(function (s) { s.classList.remove('sr__star--filled'); });
  }

  stars.forEach(function (s) {
    var i = Number(s.getAttribute('data-i'));
    s.addEventListener('pointerenter', function () { root.classList.remove('is-demo'); stopAutoplay(); requestSwap(i); });
  });
  row.addEventListener('pointerleave', hide);

  // 자동 루프: 1부터 5까지 순서대로 머무르며 이름표 문구가 바뀌는 것을 보여주고 끝에서 감춘다.
  var step = 0;
  var autoTimer = null;
  function autoTick() {
    if (step < 5) { commit(step + 1); } else { hide(); }
    step = (step + 1) % 7;
  }
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  function stopAutoplay() { if (autoTimer) { clearInterval(autoTimer); autoTimer = null; } }
  if (!reduce) { autoTimer = setInterval(autoTick, 340); autoTick(); }
})();

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

const STAR_PATH =
  "M12 .587l3.668 7.568 8.332 1.151-6.064 5.828 1.48 8.279L12 19.771l-7.416 3.642 1.48-8.279-6.064-5.828 8.332-1.151z";
const LABELS: Record<number, string> = { 1: "매우 별로", 2: "별로", 3: "보통", 4: "좋음", 5: "최고" };

export default function TooltipLabelSwap() {
  const rootRef = useRef<HTMLDivElement | null>(null);

  useEffect(() => {
    const root = rootRef.current;
    if (!root) return;
    const row = root.querySelector<HTMLDivElement>(`.${styles.row}`);
    const tip = root.querySelector<HTMLDivElement>(`.${styles.tip}`);
    if (!row || !tip) return;
    const stars = Array.prototype.slice.call(
      row.querySelectorAll(`.${styles.star}`)
    ) as HTMLElement[];
    let pendingTimer: number | null = null;

    // 계산 겹: 별의 실제 렌더 위치(getBoundingClientRect 중심 x)를 말풍선의 translateX 값으로
    // 그대로 옮기고, 인덱스 변경은 짧은 지연(debounce)을 거친 뒤에만 이름표 문구를 바꾼다 —
    // 빠르게 스쳐 지나갈 때 문구가 매 별마다 깜빡이지 않게 하는 타이밍 계산이다.
    function positionTip(i: number) {
      const star = stars[i - 1];
      const sr = star.getBoundingClientRect();
      const rr = row!.getBoundingClientRect();
      const cx = sr.left + sr.width / 2 - rr.left;
      tip!.style.transform = "translateX(" + cx.toFixed(1) + "px) translateX(-50%)";
    }

    function commit(i: number) {
      tip!.textContent = LABELS[i];
      positionTip(i);
      tip!.classList.add(styles.show);
      stars.forEach((s, idx) => s.classList.toggle(styles.filled, idx < i));
    }

    function requestSwap(i: number) {
      if (pendingTimer !== null) window.clearTimeout(pendingTimer);
      pendingTimer = window.setTimeout(() => commit(i), 40);
    }

    function hide() {
      if (pendingTimer !== null) { window.clearTimeout(pendingTimer); pendingTimer = null; }
      tip!.classList.remove(styles.show);
      stars.forEach((s) => s.classList.remove(styles.filled));
    }

    const enterHandlers: Array<() => void> = [];
    stars.forEach((s, idx) => {
      const i = idx + 1;
      const handler = () => { stopAutoplay(); requestSwap(i); };
      enterHandlers.push(handler);
      s.addEventListener("pointerenter", handler);
    });
    row.addEventListener("pointerleave", hide);

    // 자동 루프: 1부터 5까지 순서대로 머무르며 이름표 문구가 바뀌는 것을 보여주고 끝에서 감춘다.
    let step = 0;
    let autoTimer: number | null = null;
    function autoTick() {
      if (step < 5) { commit(step + 1); } else { hide(); }
      step = (step + 1) % 7;
    }
    function stopAutoplay() { if (autoTimer !== null) { window.clearInterval(autoTimer); autoTimer = null; } }
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    if (!reduce) { autoTimer = window.setInterval(autoTick, 340); autoTick(); }

    return () => {
      stopAutoplay();
      if (pendingTimer !== null) window.clearTimeout(pendingTimer);
      stars.forEach((s, idx) => s.removeEventListener("pointerenter", enterHandlers[idx]));
      row.removeEventListener("pointerleave", hide);
    };
  }, []);

  return (
    <div ref={rootRef} className={styles.stage}>
      <div className={styles.sr}>
        <div className={styles.tip}>보통</div>
        <div className={styles.row}>
          {[1, 2, 3, 4, 5].map((i) => (
            <span key={i} className={styles.star}>
              <svg viewBox="0 0 24 24"><path d={STAR_PATH} /></svg>
            </span>
          ))}
        </div>
      </div>
    </div>
  );
}