05Bulk Select That Counts With a Badge, No Toolbar

<main class="stage">
<div class="bks is-demo" id="bks">
  <div class="bks__header">
    <span class="bks__title">Document box</span>
    <span class="bks__badge" id="bksBadge" aria-live="polite" hidden>0 selected</span>
  </div>
  <ul class="bks__list" id="bksList">
    <li class="bks__row">
      <input type="checkbox" id="bksCb0" class="bks__checkbox" aria-checked="false">
      <label for="bksCb0" class="bks__label">Report draft</label>
    </li>
    <li class="bks__row">
      <input type="checkbox" id="bksCb1" class="bks__checkbox" aria-checked="false">
      <label for="bksCb1" class="bks__label">Meeting notes cleanup</label>
    </li>
    <li class="bks__row">
      <input type="checkbox" id="bksCb2" class="bks__checkbox" aria-checked="false">
      <label for="bksCb2" class="bks__label">Budget proposal review</label>
    </li>
    <li class="bks__row">
      <input type="checkbox" id="bksCb3" class="bks__checkbox" aria-checked="false">
      <label for="bksCb3" class="bks__label">Design draft</label>
    </li>
    <li class="bks__row">
      <input type="checkbox" id="bksCb4" class="bks__checkbox" aria-checked="false">
      <label for="bksCb4" class="bks__label">Contract review</label>
    </li>
  </ul>
</div>
</main>

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

// 변수 3개
$duration: $dur-quick;
$easing: $ease-pop;
$color: $subject-sky;

// 계산 겹: index.html 의 applyRange() 가 마지막 인덱스~이번 인덱스 사이를 산술로 구해
// 시프트 클릭 한 번으로 그 구간 전체 체크 상태를 맞춘다.
@include stage($stage-ink);

.bks {
  width: min(100%, 280px);
  display: flex;
  flex-direction: column;
  gap: $sp-3;
}

.bks__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 24px;
}

.bks__title {
  color: $stage-paper;
  font-weight: 700;
  font-size: 13px;
}

.bks__badge {
  box-sizing: border-box;
  padding: $sp-1 $sp-3;
  border-radius: $r-pill;
  background: rgba($color, .22);
  color: $subject-blue-light;
  font-weight: 700;
  font-size: 11px;
  transform: scale(1);

  &.is-pop {
    animation-name: bksPop;
    animation-duration: $duration;
    animation-timing-function: $easing;
  }
}

@keyframes bksPop {
  0% { transform: scale(.7); opacity: .4; }
  100% { transform: scale(1); opacity: 1; }
}

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

.bks__row {
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: $sp-2;
  padding: $sp-2 $sp-3;
  border-radius: $r-sm;
  background: rgba(255, 255, 255, .07);
}

.bks__checkbox {
  width: 16px;
  height: 16px;
  accent-color: $color;
  cursor: pointer;
}

.bks__label {
  color: $stage-paper;
  font-weight: 600;
  font-size: 12px;
  cursor: pointer;
}

@media (max-width: 340px) {
  .bks { gap: $sp-1; }
  .bks__header { min-height: 0; }
  .bks__badge { padding: 0 $sp-2; }
  .bks__list { gap: $sp-1; }
  .bks__row { padding: 0 $sp-2; }
  .bks__checkbox { width: 14px; height: 14px; }
  .bks__label { font-size: 11px; }
}

// reduce: 실사용 경로 적용 — 배지 팝 트윈만 멈춘다. 범위 선택 계산·체크 상태는 그대로 동작
@media (prefers-reduced-motion: reduce) {
  .bks__badge.is-pop { animation: none; transform: scale(1); }
}

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);
}

.bks {
  width: min(100%, 280px);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.bks__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 24px;
}

.bks__title {
  color: #ffffff;
  font-weight: 700;
  font-size: 13px;
}

.bks__badge {
  box-sizing: border-box;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(110, 200, 255, 0.22);
  color: #5b8cf8;
  font-weight: 700;
  font-size: 11px;
  transform: scale(1);
}
.bks__badge.is-pop {
  animation-name: bksPop;
  animation-duration: 220ms;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
}

@keyframes bksPop {
  0% {
    transform: scale(0.7);
    opacity: 0.4;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}
.bks__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.bks__row {
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.07);
}

.bks__checkbox {
  width: 16px;
  height: 16px;
  accent-color: #6ec8ff;
  cursor: pointer;
}

.bks__label {
  color: #ffffff;
  font-weight: 600;
  font-size: 12px;
  cursor: pointer;
}

@media (max-width: 340px) {
  .bks {
    gap: 4px;
  }
  .bks__header {
    min-height: 0;
  }
  .bks__badge {
    padding: 0 8px;
  }
  .bks__list {
    gap: 4px;
  }
  .bks__row {
    padding: 0 8px;
  }
  .bks__checkbox {
    width: 14px;
    height: 14px;
  }
  .bks__label {
    font-size: 11px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .bks__badge.is-pop {
    animation: none;
    transform: scale(1);
  }
}

(function () {
  var AUTO_STEP_MS = 550;
  var AUTO_RESET_DELAY_MS = 900;
  var AUTO_SEQ = [
    { idx: 0, shift: false },
    { idx: 3, shift: true },
    { idx: 1, shift: false }
  ];

  var root = document.getElementById('bks');
  var list = document.getElementById('bksList');
  var badge = document.getElementById('bksBadge');
  var rows = Array.prototype.slice.call(list.querySelectorAll('.bks__row'));
  var checkboxes = rows.map(function (row) { return row.querySelector('input'); });
  var lastIndex = null;

  function setChecked(cb, checked) {
    cb.checked = checked;
    cb.setAttribute('aria-checked', checked ? 'true' : 'false');
  }

  function updateBadge() {
    var n = checkboxes.filter(function (cb) { return cb.checked; }).length;
    badge.hidden = n === 0;
    badge.textContent = n + ' selected';
    badge.classList.remove('is-pop');
    void badge.offsetWidth;
    badge.classList.add('is-pop');
  }

  // 계산 겹: 마지막으로 다룬 인덱스와 이번 인덱스 사이 범위를 산술로 구해
  // 그 구간 전체를 한 번에 같은 상태로 맞춘다 — 하나씩 누르지 않아도 된다.
  function applyRange(fromIdx, toIdx, checked) {
    var lo = Math.min(fromIdx, toIdx);
    var hi = Math.max(fromIdx, toIdx);
    for (var i = lo; i <= hi; i += 1) {
      setChecked(checkboxes[i], checked);
    }
  }

  function clearAll() {
    checkboxes.forEach(function (cb) { setChecked(cb, false); });
    lastIndex = null;
    updateBadge();
  }

  function human() {
    if (root.classList.contains('is-demo')) {
      root.classList.remove('is-demo');
      if (timer) { window.clearInterval(timer); timer = null; }
    }
  }

  checkboxes.forEach(function (cb, idx) {
    cb.addEventListener('click', function (e) {
      human();
      if (e.shiftKey && lastIndex !== null) {
        applyRange(lastIndex, idx, cb.checked);
      }
      lastIndex = idx;
      updateBadge();
    });
  });

  var timer = null;
  var seqPos = 0;

  function autoTick() {
    if (seqPos >= AUTO_SEQ.length) {
      window.clearInterval(timer);
      timer = null;
      window.setTimeout(function () {
        clearAll();
        seqPos = 0;
        timer = window.setInterval(autoTick, AUTO_STEP_MS);
      }, AUTO_RESET_DELAY_MS);
      return;
    }
    var step = AUTO_SEQ[seqPos];
    var cb = checkboxes[step.idx];
    var nextChecked = !cb.checked;
    if (step.shift && lastIndex !== null) {
      applyRange(lastIndex, step.idx, nextChecked);
    } else {
      setChecked(cb, nextChecked);
    }
    lastIndex = step.idx;
    updateBadge();
    seqPos += 1;
  }

  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  if (!reduce) {
    timer = window.setInterval(autoTick, AUTO_STEP_MS);
  } else {
    // reduce: 실사용 경로 적용 — 자동 선택 루프와 배지 팝 트윈을 멈춘다. 클릭·범위 선택 계산은 그대로 동작
  }
})();

// BulkSelect — vanilla 판(run/381/demo/05-bulk-select/index.html)의 React 포트.
// Shift 클릭 구간 선택은 마지막으로 다룬 인덱스와 이번 인덱스 사이를 산술로 구해
// 그 구간 전체를 클릭된 체크박스의 결과 상태로 한 번에 맞춘다.
import { useEffect, useRef } from "react";
import type { CSSProperties } from "react";
import styles from "./BulkSelect.module.scss";

export type BulkSelectProps = {
  duration?: string;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };

const LABELS = ["보고서 초안", "회의록 정리", "예산안 검토", "디자인 초안", "계약서 검토"];

type AutoStep = { idx: number; shift: boolean };
const AUTO_SEQ: AutoStep[] = [
  { idx: 0, shift: false },
  { idx: 3, shift: true },
  { idx: 1, shift: false },
];

export default function BulkSelect({
  duration = "220ms", // vanilla $duration: $dur-quick
  easing = "cubic-bezier(.2, 1.4, .4, 1)", // vanilla $easing: $ease-pop
  color = "#6ec8ff", // vanilla $color: $subject-sky
}: BulkSelectProps) {
  const rootRef = useRef<HTMLDivElement | null>(null);

  useEffect(() => {
    const root = rootRef.current;
    if (!root) return;
    const list = root.querySelector<HTMLUListElement>('[data-role="list"]');
    const badge = root.querySelector<HTMLSpanElement>('[data-role="badge"]');
    if (!list || !badge) return;
    const rows = Array.prototype.slice.call(list.querySelectorAll("[data-row]")) as HTMLLIElement[];
    const checkboxes = rows.map((row) => row.querySelector<HTMLInputElement>("input")!);

    const AUTO_STEP_MS = 550;
    const AUTO_RESET_DELAY_MS = 900;

    let lastIndex: number | null = null;

    function setChecked(cb: HTMLInputElement, checked: boolean): void {
      cb.checked = checked;
      cb.setAttribute("aria-checked", checked ? "true" : "false");
    }

    function updateBadge(): void {
      const n = checkboxes.filter((cb) => cb.checked).length;
      badge!.hidden = n === 0;
      badge!.textContent = n + "개 선택";
      badge!.classList.remove("is-pop");
      void badge!.offsetWidth; // 리플로우 강제 — 연속 클릭에도 팝 애니메이션이 매번 재생되게
      badge!.classList.add("is-pop");
    }

    // 계산 겹: 마지막으로 다룬 인덱스와 이번 인덱스 사이 범위를 산술로 구해
    // 그 구간 전체를 한 번에 같은 상태로 맞춘다 — 하나씩 누르지 않아도 된다.
    function applyRange(fromIdx: number, toIdx: number, checked: boolean): void {
      const lo = Math.min(fromIdx, toIdx);
      const hi = Math.max(fromIdx, toIdx);
      for (let i = lo; i <= hi; i += 1) {
        setChecked(checkboxes[i], checked);
      }
    }

    function clearAll(): void {
      checkboxes.forEach((cb) => setChecked(cb, false));
      lastIndex = null;
      updateBadge();
    }

    function human(): void {
      if (root!.classList.contains("is-demo")) {
        root!.classList.remove("is-demo");
        if (timer) {
          window.clearInterval(timer);
          timer = null;
        }
      }
    }

    const clickHandlers: ((e: MouseEvent) => void)[] = [];
    checkboxes.forEach((cb, idx) => {
      const onClick = (e: MouseEvent) => {
        human();
        if (e.shiftKey && lastIndex !== null) {
          applyRange(lastIndex, idx, cb.checked);
        }
        lastIndex = idx;
        updateBadge();
      };
      cb.addEventListener("click", onClick);
      clickHandlers.push(onClick);
    });

    let timer: number | null = null;
    let seqPos = 0;

    function autoTick(): void {
      if (seqPos >= AUTO_SEQ.length) {
        if (timer) {
          window.clearInterval(timer);
          timer = null;
        }
        window.setTimeout(() => {
          clearAll();
          seqPos = 0;
          timer = window.setInterval(autoTick, AUTO_STEP_MS);
        }, AUTO_RESET_DELAY_MS);
        return;
      }
      const step = AUTO_SEQ[seqPos];
      const cb = checkboxes[step.idx];
      const nextChecked = !cb.checked;
      if (step.shift && lastIndex !== null) {
        applyRange(lastIndex, step.idx, nextChecked);
      } else {
        setChecked(cb, nextChecked);
      }
      lastIndex = step.idx;
      updateBadge();
      seqPos += 1;
    }

    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    if (!reduce) {
      timer = window.setInterval(autoTick, AUTO_STEP_MS);
    }
    // reduce: 실사용 경로 적용 — 자동 선택 루프와 배지 팝 트윈을 멈춘다. 클릭·범위 선택 계산은 그대로 동작

    return () => {
      checkboxes.forEach((cb, idx) => {
        cb.removeEventListener("click", clickHandlers[idx]);
      });
      if (timer) {
        window.clearInterval(timer);
      }
    };
  }, []);

  const vars: Vars = { "--duration": duration, "--easing": easing, "--color": color };

  return (
    <main className={styles.stage}>
      <div className={`${styles.bks} is-demo`} ref={rootRef} style={vars}>
        <div className={styles.bks__header}>
          <span className={styles.bks__title}>문서함</span>
          <span className={styles.bks__badge} data-role="badge" aria-live="polite" hidden>
            0개 선택
          </span>
        </div>
        <ul className={styles.bks__list} data-role="list">
          {LABELS.map((label, i) => (
            <li className={styles.bks__row} data-row={i} key={i}>
              <input
                type="checkbox"
                id={`bksCb${i}`}
                className={styles.bks__checkbox}
                aria-checked="false"
                readOnly
              />
              <label htmlFor={`bksCb${i}`} className={styles.bks__label}>
                {label}
              </label>
            </li>
          ))}
        </ul>
      </div>
    </main>
  );
}