05件数バー分解 — 星の点数ごとの回答件数の値が横棒の長さの値に分かれて現れる方式

<main class="stage">
<div class="sr is-demo" id="sr">
  <div class="sr__list" id="srList" role="list">
    <button class="sr__row" type="button" role="listitem" data-star="5" aria-pressed="false">
      <span class="sr__label">5</span>
      <span class="sr__track"><span class="sr__bar" data-bar></span></span>
      <span class="sr__pct" data-pct>0%</span>
    </button>
    <button class="sr__row" type="button" role="listitem" data-star="4" aria-pressed="false">
      <span class="sr__label">4</span>
      <span class="sr__track"><span class="sr__bar" data-bar></span></span>
      <span class="sr__pct" data-pct>0%</span>
    </button>
    <button class="sr__row" type="button" role="listitem" data-star="3" aria-pressed="false">
      <span class="sr__label">3</span>
      <span class="sr__track"><span class="sr__bar" data-bar></span></span>
      <span class="sr__pct" data-pct>0%</span>
    </button>
    <button class="sr__row" type="button" role="listitem" data-star="2" aria-pressed="false">
      <span class="sr__label">2</span>
      <span class="sr__track"><span class="sr__bar" data-bar></span></span>
      <span class="sr__pct" data-pct>0%</span>
    </button>
    <button class="sr__row" type="button" role="listitem" data-star="1" aria-pressed="false">
      <span class="sr__label">1</span>
      <span class="sr__track"><span class="sr__bar" data-bar></span></span>
      <span class="sr__pct" data-pct>0%</span>
    </button>
  </div>
</div>
</main>

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

// 계산 겹: 별점별 응답 개수를 전체 응답 개수 합으로 나눈 비율(%)을 막대 길이 값으로 쓴다 (paint()).
@include stage($stage-ink);

.sr__list {
  display: grid;
  gap: $sp-2;
  width: clamp(220px, 70vw, 320px);
}

.sr__row {
  display: grid;
  grid-template-columns: 16px 1fr 68px;
  align-items: center;
  gap: $sp-3;
  border: 0;
  background: none;
  padding: $sp-1 $sp-2;
  border-radius: $r-sm;
  cursor: pointer;
  transition: background $dur-quick $ease-out;

  &--on { background: rgba($subject-blue-light, .18); }
}

.sr__label {
  color: $stage-paper;
  font: 600 13px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  text-align: center;
}

.sr__track {
  height: 10px;
  border-radius: $r-pill;
  background: rgba($stage-paper, .14);
  overflow: hidden;
}

.sr__bar {
  display: block;
  height: 100%;
  width: 0%;
  border-radius: $r-pill;
  background: $subject-mint;
  transition: width $dur-base $ease-out;
}

.sr__row--on .sr__bar { background: $subject-pink; }

.sr__pct {
  color: $stage-paper;
  font: 500 12px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 340px) {
  .sr__list { width: 100%; gap: $sp-1; }
  .sr__row { grid-template-columns: 14px 1fr 56px; gap: $sp-2; }
  .sr__pct { font-size: 11px; }
}

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

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);
}

.sr__list {
  display: grid;
  gap: 8px;
  width: clamp(220px, 70vw, 320px);
}

.sr__row {
  display: grid;
  grid-template-columns: 16px 1fr 68px;
  align-items: center;
  gap: 12px;
  border: 0;
  background: none;
  padding: 4px 8px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 220ms ease-out;
}
.sr__row--on {
  background: rgba(91, 140, 248, 0.18);
}

.sr__label {
  color: #ffffff;
  font: 600 13px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  text-align: center;
}

.sr__track {
  height: 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  overflow: hidden;
}

.sr__bar {
  display: block;
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: #4cd4a6;
  transition: width 300ms ease-out;
}

.sr__row--on .sr__bar {
  background: #ff9ebb;
}

.sr__pct {
  color: #ffffff;
  font: 500 12px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 340px) {
  .sr__list {
    width: 100%;
    gap: 4px;
  }
  .sr__row {
    grid-template-columns: 14px 1fr 56px;
    gap: 8px;
  }
  .sr__pct {
    font-size: 11px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .sr__row, .sr__bar {
    transition: none;
  }
}

(function () {
  var root = document.getElementById('sr');
  var rows = Array.prototype.slice.call(document.querySelectorAll('.sr__row'));
  var counts = { 5: 42, 4: 21, 3: 9, 2: 4, 1: 3 };
  var selected = null;

  // 계산 겹: 각 별점의 응답 개수를 전체 응답 개수 합으로 나눈 비율(%)을 막대 길이 값으로 쓴다.
  function total() {
    var t = 0;
    for (var k in counts) t += counts[k];
    return t;
  }

  function paint() {
    var t = total();
    rows.forEach(function (row) {
      var star = Number(row.getAttribute('data-star'));
      var pct = t ? (counts[star] / t) * 100 : 0;
      row.querySelector('[data-bar]').style.width = pct.toFixed(1) + '%';
      row.querySelector('[data-pct]').textContent = Math.round(pct) + '% (' + counts[star] + ')';
      row.classList.toggle('sr__row--on', star === selected);
      row.setAttribute('aria-pressed', String(star === selected));
    });
  }

  rows.forEach(function (row) {
    row.addEventListener('click', function () {
      root.classList.remove('is-demo'); stopAutoplay();
      var star = Number(row.getAttribute('data-star'));
      selected = selected === star ? null : star;
      paint();
    });
  });

  paint();

  // 자동 루프: 星評価 5→1 순서로 한 줄씩 選択 상태를 옮기고, 한 바퀴마다 응답 개수 하나를
  // 늘려 막대 길이 비율이 실시간으로 바뀌는 것을 보여준다.
  var order = [5, 4, 3, 2, 1];
  var oi = 0;
  var bump = [5, 3, 4, 5, 2, 5, 1, 4, 5, 3];
  var bi = 0;
  var autoTimer = null;
  function autoTick() {
    selected = order[oi];
    oi = (oi + 1) % order.length;
    if (oi === 0) { var v = bump[bi % bump.length]; bi++; counts[v] = counts[v] + 1; }
    paint();
  }
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  function stopAutoplay() { if (autoTimer) { clearInterval(autoTimer); autoTimer = null; } }
  if (!reduce) { autoTimer = setInterval(autoTick, 380); autoTick(); }
})();

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

const STARS = [5, 4, 3, 2, 1];

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

  useEffect(() => {
    const root = rootRef.current;
    if (!root) return;
    const rows = Array.prototype.slice.call(
      root.querySelectorAll(`.${styles.row}`)
    ) as HTMLElement[];
    let counts: Record<number, number> = { 5: 42, 4: 21, 3: 9, 2: 4, 1: 3 };
    let selected: number | null = null;

    // 계산 겹: 각 별점의 응답 개수를 전체 응답 개수 합으로 나눈 비율(%)을 막대 길이 값으로 쓴다.
    function total() {
      let t = 0;
      for (const k in counts) t += counts[Number(k)];
      return t;
    }

    function paint() {
      const t = total();
      rows.forEach((row, idx) => {
        const star = STARS[idx];
        const pct = t ? (counts[star] / t) * 100 : 0;
        row.querySelector<HTMLElement>(`.${styles.bar}`)!.style.width = pct.toFixed(1) + "%";
        row.querySelector<HTMLElement>(`.${styles.pct}`)!.textContent =
          Math.round(pct) + "% (" + counts[star] + ")";
        row.classList.toggle(styles.on, star === selected);
        row.setAttribute("aria-pressed", String(star === selected));
      });
    }

    const clickHandlers: Array<() => void> = [];
    rows.forEach((row, idx) => {
      const handler = () => {
        stopAutoplay();
        const star = STARS[idx];
        selected = selected === star ? null : star;
        paint();
      };
      clickHandlers.push(handler);
      row.addEventListener("click", handler);
    });

    paint();

    // 자동 루프: 별점 5→1 순서로 한 줄씩 선택 상태를 옮기고, 한 바퀴마다 응답 개수 하나를
    // 늘려 막대 길이 비율이 실시간으로 바뀌는 것을 보여준다.
    const order = [5, 4, 3, 2, 1];
    let oi = 0;
    const bump = [5, 3, 4, 5, 2, 5, 1, 4, 5, 3];
    let bi = 0;
    let autoTimer: number | null = null;
    function autoTick() {
      selected = order[oi];
      oi = (oi + 1) % order.length;
      if (oi === 0) { const v = bump[bi % bump.length]; bi++; counts[v] = counts[v] + 1; }
      paint();
    }
    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, 380); autoTick(); }

    return () => {
      stopAutoplay();
      rows.forEach((row, idx) => row.removeEventListener("click", clickHandlers[idx]));
    };
  }, []);

  return (
    <div ref={rootRef} className={styles.stage}>
      <div className={styles.list} role="list">
        {STARS.map((star) => (
          <button key={star} type="button" className={styles.row} role="listitem" aria-pressed="false">
            <span className={styles.label}>{star}</span>
            <span className={styles.track}><span className={styles.bar} /></span>
            <span className={styles.pct}>0%</span>
          </button>
        ))}
      </div>
    </div>
  );
}