05Multi-select chip tokens

<main class="stage">
  <div class="mc is-demo is-open">
    <span class="mc__label" id="mc-label">Tech stack</span>
    <div class="mc__field" id="mc-field" role="combobox" tabindex="0" aria-haspopup="listbox" aria-expanded="true" aria-controls="mc-list" aria-labelledby="mc-label">
      <span class="mc__chips" id="mc-chips">
        <span class="mc__chip" data-for="mc-o1">React<button class="mc__x" type="button" aria-label="Remove React"><svg viewBox="0 0 256 256" width="10" height="10"><g fill="currentColor"><path d="M216 56v144a16 16 0 0 1-16 16H56a16 16 0 0 1-16-16V56a16 16 0 0 1 16-16h144a16 16 0 0 1 16 16" opacity=".2"/><path d="M205.66 194.34a8 8 0 0 1-11.32 11.32L128 139.31l-66.34 66.35a8 8 0 0 1-11.32-11.32L116.69 128L50.34 61.66a8 8 0 0 1 11.32-11.32L128 116.69l66.34-66.35a8 8 0 0 1 11.32 11.32L139.31 128Z"/></g></svg></button></span>
        <span class="mc__chip" data-for="mc-o2">SCSS<button class="mc__x" type="button" aria-label="Remove SCSS"><svg viewBox="0 0 256 256" width="10" height="10"><g fill="currentColor"><path d="M216 56v144a16 16 0 0 1-16 16H56a16 16 0 0 1-16-16V56a16 16 0 0 1 16-16h144a16 16 0 0 1 16 16" opacity=".2"/><path d="M205.66 194.34a8 8 0 0 1-11.32 11.32L128 139.31l-66.34 66.35a8 8 0 0 1-11.32-11.32L116.69 128L50.34 61.66a8 8 0 0 1 11.32-11.32L128 116.69l66.34-66.35a8 8 0 0 1 11.32 11.32L139.31 128Z"/></g></svg></button></span>
        <span class="mc__chip mc__chip--ghost" aria-hidden="true">Vite</span>
      </span>
      <span class="mc__caret" aria-hidden="true"><svg viewBox="0 0 256 256" width="12" height="12"><g fill="currentColor"><path d="m208 96l-80 80l-80-80Z" opacity=".2"/><path d="M215.39 92.94A8 8 0 0 0 208 88H48a8 8 0 0 0-5.66 13.66l80 80a8 8 0 0 0 11.32 0l80-80a8 8 0 0 0 1.73-8.72M128 164.69L67.31 104h121.38Z"/></g></svg></span>
    </div>
    <ul class="mc__list" id="mc-list" role="listbox" aria-multiselectable="true" aria-labelledby="mc-label">
      <li class="mc__opt is-on" id="mc-o1" role="option" aria-selected="true">React<span class="mc__tick" aria-hidden="true"><svg viewBox="0 0 256 256" width="13" height="13"><g fill="currentColor"><path d="M224 128a96 96 0 1 1-96-96a96 96 0 0 1 96 96" opacity=".2"/><path d="M173.66 98.34a8 8 0 0 1 0 11.32l-56 56a8 8 0 0 1-11.32 0l-24-24a8 8 0 0 1 11.32-11.32L112 148.69l50.34-50.35a8 8 0 0 1 11.32 0M232 128A104 104 0 1 1 128 24a104.11 104.11 0 0 1 104 104m-16 0a88 88 0 1 0-88 88a88.1 88.1 0 0 0 88-88"/></g></svg></span></li>
      <li class="mc__opt is-on" id="mc-o2" role="option" aria-selected="true">SCSS<span class="mc__tick" aria-hidden="true"><svg viewBox="0 0 256 256" width="13" height="13"><g fill="currentColor"><path d="M224 128a96 96 0 1 1-96-96a96 96 0 0 1 96 96" opacity=".2"/><path d="M173.66 98.34a8 8 0 0 1 0 11.32l-56 56a8 8 0 0 1-11.32 0l-24-24a8 8 0 0 1 11.32-11.32L112 148.69l50.34-50.35a8 8 0 0 1 11.32 0M232 128A104 104 0 1 1 128 24a104.11 104.11 0 0 1 104 104m-16 0a88 88 0 1 0-88 88a88.1 88.1 0 0 0 88-88"/></g></svg></span></li>
      <li class="mc__opt mc__opt--pulse" id="mc-o3" role="option" aria-selected="false">Vite<span class="mc__tick" aria-hidden="true"><svg viewBox="0 0 256 256" width="13" height="13"><g fill="currentColor"><path d="M224 128a96 96 0 1 1-96-96a96 96 0 0 1 96 96" opacity=".2"/><path d="M173.66 98.34a8 8 0 0 1 0 11.32l-56 56a8 8 0 0 1-11.32 0l-24-24a8 8 0 0 1 11.32-11.32L112 148.69l50.34-50.35a8 8 0 0 1 11.32 0M232 128A104 104 0 1 1 128 24a104.11 104.11 0 0 1 104 104m-16 0a88 88 0 1 0-88 88a88.1 88.1 0 0 0 88-88"/></g></svg></span></li>
    </ul>
  </div>
</main>

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

$duration: $dur-quick;
$easing: $ease-pop;
$color: $subject-blue;

@include stage($stage-ink);

.mc {
  position: relative;
  box-sizing: border-box;
  width: min(228px, 84vw);
  // 열린 목록은 absolute 라 높이에 안 잡힌다 — 그만큼 아래를 비워 둔다
  padding-bottom: 96px;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}
.mc__label {
  display: block;
  font-size: 10px; line-height: 12px; font-weight: 800;
  letter-spacing: .04em;
  color: rgba(255, 255, 255, .6);
  margin: 0 0 $sp-1;
}
.mc__field {
  box-sizing: border-box;
  min-height: 36px;
  display: flex; align-items: center; justify-content: space-between; gap: $sp-2;
  padding: 0 $sp-2;
  border: 1px solid rgba(255, 255, 255, .16);
  background: rgba(255, 255, 255, .06);
  border-radius: $r-control;
  cursor: text;
}
.mc__field:focus-visible { outline: 2px solid $color; outline-offset: 2px; }
.mc__chips { display: flex; align-items: center; gap: $sp-1; flex-wrap: nowrap; }
.mc__chip {
  box-sizing: border-box;
  height: 22px;
  display: inline-flex; align-items: center; gap: $sp-1;
  padding: 0 $sp-1 0 $sp-2;
  border-radius: $r-pill;
  background: rgba(47, 109, 246, .9);
  color: #fff;
  font-size: 10px; font-weight: 700;
  white-space: nowrap;
}
.mc__x {
  display: inline-flex; align-items: center; justify-content: center;
  width: 14px; height: 14px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, .22);
  color: #fff;
  font: inherit;
  font-size: 10px; line-height: 1;
  cursor: pointer;
}
.mc__chip--ghost {
  transform: scale(.5);
  opacity: 0;
}
.mc__caret { display: inline-flex; color: rgba(255, 255, 255, .5); }

.mc__list {
  position: absolute;
  top: 60px; left: 0; right: 0;
  box-sizing: border-box;
  margin: 0; padding: $sp-1;
  list-style: none;
  background: #fff;
  border-radius: $r-card;
  box-shadow: $shadow-raised;
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity $duration $easing, transform $duration $easing;
}
.mc.is-open .mc__list { opacity: 1; transform: translateY(0); pointer-events: auto; }
.mc__opt {
  box-sizing: border-box;
  height: 26px;
  display: flex; align-items: center; justify-content: space-between; gap: $sp-2;
  padding: 0 $sp-2;
  border-radius: $r-sm;
  color: $stage-ink;
  font-size: 12px; font-weight: 600;
  cursor: pointer;
}
.mc__opt.is-at, .mc__opt:hover { background: rgba(47, 109, 246, .1); }
.mc__tick { display: inline-flex; color: $color; opacity: 0; }
.mc__opt.is-on .mc__tick { opacity: 1; }

// ── 자동 루프: 세 번째 항목을 고르면 칩이 튀어나오고, 다시 빼면 칩이 줄어든다 ──
.mc.is-demo .mc__chip--ghost { animation: mc-chip $dur-loop $easing infinite; }
.mc.is-demo .mc__opt--pulse .mc__tick { animation: mc-tick $dur-loop $easing infinite; }
@keyframes mc-chip {
  0%, 100% { transform: scale(.5); opacity: 0; }
  24%      { transform: scale(1); opacity: 1; }
  76%      { transform: scale(1); opacity: 1; }
}
@keyframes mc-tick {
  0%, 100% { opacity: 0; }
  24%      { opacity: 1; }
  76%      { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .mc.is-demo .mc__chip--ghost,
  .mc.is-demo .mc__opt--pulse .mc__tick { animation: none !important; }
  .mc__list { 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);
}

.mc {
  position: relative;
  box-sizing: border-box;
  width: min(228px, 84vw);
  padding-bottom: 96px;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.mc__label {
  display: block;
  font-size: 10px;
  line-height: 12px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.6);
  margin: 0 0 4px;
}

.mc__field {
  box-sizing: border-box;
  min-height: 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 0 8px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  cursor: text;
}

.mc__field:focus-visible {
  outline: 2px solid #2f6df6;
  outline-offset: 2px;
}

.mc__chips {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: nowrap;
}

.mc__chip {
  box-sizing: border-box;
  height: 22px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0 4px 0 8px;
  border-radius: 999px;
  background: rgba(47, 109, 246, 0.9);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  white-space: nowrap;
}

.mc__x {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.22);
  color: #fff;
  font: inherit;
  font-size: 10px;
  line-height: 1;
  cursor: pointer;
}

.mc__chip--ghost {
  transform: scale(0.5);
  opacity: 0;
}

.mc__caret {
  display: inline-flex;
  color: rgba(255, 255, 255, 0.5);
}

.mc__list {
  position: absolute;
  top: 60px;
  left: 0;
  right: 0;
  box-sizing: border-box;
  margin: 0;
  padding: 4px;
  list-style: none;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity 220ms cubic-bezier(0.2, 1.4, 0.4, 1), transform 220ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.mc.is-open .mc__list {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.mc__opt {
  box-sizing: border-box;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 0 8px;
  border-radius: 8px;
  color: #17141a;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.mc__opt.is-at, .mc__opt:hover {
  background: rgba(47, 109, 246, 0.1);
}

.mc__tick {
  display: inline-flex;
  color: #2f6df6;
  opacity: 0;
}

.mc__opt.is-on .mc__tick {
  opacity: 1;
}

.mc.is-demo .mc__chip--ghost {
  animation: mc-chip 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.mc.is-demo .mc__opt--pulse .mc__tick {
  animation: mc-tick 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@keyframes mc-chip {
  0%, 100% {
    transform: scale(0.5);
    opacity: 0;
  }
  24% {
    transform: scale(1);
    opacity: 1;
  }
  76% {
    transform: scale(1);
    opacity: 1;
  }
}
@keyframes mc-tick {
  0%, 100% {
    opacity: 0;
  }
  24% {
    opacity: 1;
  }
  76% {
    opacity: 1;
  }
}
@media (prefers-reduced-motion: reduce) {
  .mc.is-demo .mc__chip--ghost,
  .mc.is-demo .mc__opt--pulse .mc__tick {
    animation: none !important;
  }
  .mc__list {
    transition: none;
  }
}

// 실제 동작: 항목을 누르면 칩이 실제로 늘고 줄며, Backspace 는 마지막 칩을 뺀다.
var root = document.querySelector('.mc');
var field = document.getElementById('mc-field');
var chips = document.getElementById('mc-chips');
var list = document.getElementById('mc-list');
var opts = [].slice.call(list.querySelectorAll('.mc__opt'));
var ghost = chips.querySelector('.mc__chip--ghost');
var at = 0;
function label(o) { return o.firstChild.nodeValue; }
function sync(o) {
  root.classList.remove('is-demo');
  if (ghost) { ghost.remove(); ghost = null; }
  var on = o.getAttribute('aria-selected') !== 'true';
  o.setAttribute('aria-selected', String(on));
  o.classList.toggle('is-on', on);
  var have = chips.querySelector('[data-for="' + o.id + '"]');
  if (on && !have) {
    var chip = document.createElement('span');
    chip.className = 'mc__chip';
    chip.dataset.for = o.id;
    chip.textContent = label(o);
    var x = document.createElement('button');
    x.type = 'button';
    x.className = 'mc__x';
    x.setAttribute('aria-label', label(o) + ' — remove');
    x.textContent = '×';
    x.addEventListener('click', function (e) { e.stopPropagation(); sync(o); });
    chip.appendChild(x);
    chips.appendChild(chip);
  } else if (!on && have) { have.remove(); }
}
opts.forEach(function (o, i) {
  o.addEventListener('click', function () { at = i; sync(o); });
});
chips.querySelectorAll('.mc__x').forEach(function (x) {
  x.addEventListener('click', function (e) {
    e.stopPropagation();
    sync(document.getElementById(x.parentNode.dataset.for));
  });
});
field.addEventListener('keydown', function (e) {
  if (e.key === 'Backspace') {
    var last = chips.querySelector('.mc__chip:last-child');
    if (last && last.dataset.for) sync(document.getElementById(last.dataset.for));
    e.preventDefault();
  } else if (e.key === 'ArrowDown' || e.key === 'ArrowUp') {
    at = Math.max(0, Math.min(at + (e.key === 'ArrowDown' ? 1 : -1), opts.length - 1));
    opts.forEach(function (o, k) { o.classList.toggle('is-at', k === at); });
    field.setAttribute('aria-activedescendant', opts[at].id);
    e.preventDefault();
  } else if (e.key === 'Enter' || e.key === ' ') { sync(opts[at]); e.preventDefault(); }
  else if (e.key === 'Escape') { root.classList.remove('is-open'); field.blur(); }
});

import { useRef, useState } from "react";
import type { CSSProperties } from "react";
import styles from "./MultiChipSelect.module.scss";

export type MultiChipSelectProps = {
  label?: string;
  options?: string[];
  initial?: string[];
  removeLabel?: (name: string) => string;
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
type KeyEvt = { key: string; preventDefault: () => void };
type ChangeEvt = { target: { value: string } };
type ClickEvt = { stopPropagation: () => void };

const DEFAULT_OPTIONS = ["React", "SCSS", "Vite"];
const DEFAULT_INITIAL = ["React", "SCSS"];

function XIcon() {
  return (
    <svg viewBox="0 0 256 256" width="10" height="10">
      <g fill="currentColor">
        <path d="M216 56v144a16 16 0 0 1-16 16H56a16 16 0 0 1-16-16V56a16 16 0 0 1 16-16h144a16 16 0 0 1 16 16" opacity=".2" />
        <path d="M205.66 194.34a8 8 0 0 1-11.32 11.32L128 139.31l-66.34 66.35a8 8 0 0 1-11.32-11.32L116.69 128L50.34 61.66a8 8 0 0 1 11.32-11.32L128 116.69l66.34-66.35a8 8 0 0 1 11.32 11.32L139.31 128Z" />
      </g>
    </svg>
  );
}

export default function MultiChipSelect({
  label = "Tech stack",
  options = DEFAULT_OPTIONS,
  initial = DEFAULT_INITIAL,
  removeLabel = (name: string) => `Remove ${name}`,
  duration = 220,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#2f6df6",
}: MultiChipSelectProps) {
  const [open, setOpen] = useState(true);
  const [chips, setChips] = useState<string[]>(initial);
  const [at, setAt] = useState(0);
  const fieldRef = useRef<HTMLDivElement>(null);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  function toggle(name: string) {
    setChips((cur) => (cur.includes(name) ? cur.filter((c) => c !== name) : [...cur, name]));
  }

  return (
    <div className={`${styles.mc} ${open ? styles.isOpen : ""}`} style={vars}>
      <span className={styles.label} id="mc-label">{label}</span>
      <div
        ref={fieldRef}
        id="mc-field"
        className={styles.field}
        role="combobox"
        tabIndex={0}
        aria-haspopup="listbox"
        aria-expanded={open}
        aria-controls="mc-list"
        aria-labelledby="mc-label"
        aria-activedescendant={`mc-o${at}`}
        onClick={() => setOpen(true)}
        onKeyDown={(e: KeyEvt) => {
          if (e.key === "Backspace") {
            setChips((cur) => cur.slice(0, -1));
            e.preventDefault();
          } else if (e.key === "ArrowDown" || e.key === "ArrowUp") {
            setAt((a) => Math.max(0, Math.min(a + (e.key === "ArrowDown" ? 1 : -1), options.length - 1)));
            setOpen(true);
            e.preventDefault();
          } else if (e.key === "Enter" || e.key === " ") {
            toggle(options[at]);
            e.preventDefault();
          } else if (e.key === "Escape") {
            setOpen(false);
            fieldRef.current?.blur();
          }
        }}
      >
        <span className={styles.chips} id="mc-chips">
          {chips.map((c) => (
            <span key={c} className={styles.chip}>
              {c}
              <button
                type="button"
                className={styles.x}
                aria-label={removeLabel(c)}
                onClick={(e: ClickEvt) => {
                  e.stopPropagation();
                  toggle(c);
                }}
              >
                <XIcon />
              </button>
            </span>
          ))}
        </span>
        <span className={styles.caret} aria-hidden="true">
          <svg viewBox="0 0 256 256" width="12" height="12">
            <g fill="currentColor">
              <path d="m208 96l-80 80l-80-80Z" opacity=".2" />
              <path d="M215.39 92.94A8 8 0 0 0 208 88H48a8 8 0 0 0-5.66 13.66l80 80a8 8 0 0 0 11.32 0l80-80a8 8 0 0 0 1.73-8.72M128 164.69L67.31 104h121.38Z" />
            </g>
          </svg>
        </span>
      </div>
      <ul
        id="mc-list"
        className={styles.list}
        role="listbox"
        aria-multiselectable="true"
        aria-labelledby="mc-label"
      >
        {options.map((o, i) => {
          const on = chips.includes(o);
          return (
            <li
              key={o}
              id={`mc-o${i}`}
              className={`${styles.opt} ${on ? styles.isOn : ""} ${i === at ? styles.isAt : ""}`}
              role="option"
              aria-selected={on}
              onMouseMove={() => setAt(i)}
              onClick={() => {
                setAt(i);
                toggle(o);
                fieldRef.current?.focus({ preventScroll: true });
              }}
            >
              {o}
              <span className={styles.tick} aria-hidden="true">
                <svg viewBox="0 0 256 256" width="13" height="13">
                  <g fill="currentColor">
                    <path d="M224 128a96 96 0 1 1-96-96a96 96 0 0 1 96 96" opacity=".2" />
                    <path d="M173.66 98.34a8 8 0 0 1 0 11.32l-56 56a8 8 0 0 1-11.32 0l-24-24a8 8 0 0 1 11.32-11.32L112 148.69l50.34-50.35a8 8 0 0 1 11.32 0M232 128A104 104 0 1 1 128 24a104.11 104.11 0 0 1 104 104m-16 0a88 88 0 1 0-88 88a88.1 88.1 0 0 0 88-88" />
                  </g>
                </svg>
              </span>
            </li>
          );
        })}
      </ul>
    </div>
  );
}