05누른 시간 값이 문턱을 넘으면 변형이 펼쳐지는 길게 누르기

<main class="stage">
<div class="lp is-demo" id="lp">
  <div class="lp__wrap">
    <div class="lp__fan" id="lpFan" role="menu" aria-label="반응 변형" hidden></div>
    <button class="lp__main" id="lpMain" type="button" aria-label="좋아요">
      <span class="lp__mainCh" id="lpMainCh">&#128077;</span>
      <span class="lp__ring" aria-hidden="true"><span class="lp__ringFill" id="lpRingFill"></span></span>
    </button>
  </div>
  <p class="lp__sr" role="status" aria-live="polite" id="lpLive"></p>
</div>
</main>

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

// 계산 겹: index.html press()/tick() 이 pointerdown 시각을 performance.now() 로 저장해 두고
// 매 프레임 지금 시각과의 차(누른 시간 값)를 문턱과 비교한다 — 그 값을 링 채움 비율로 그대로 쓴다.
@include stage($stage-ink);

.lp { display: flex; flex-direction: column; align-items: center; gap: $sp-2; }

.lp__wrap { position: relative; display: flex; flex-direction: column; align-items: center; }

.lp__main {
  position: relative; width: 56px; height: 56px; border-radius: 50%; border: none;
  background: rgba($subject-cream, .92); display: flex; align-items: center; justify-content: center;
  box-shadow: $shadow-raised; cursor: pointer; touch-action: none;
}
.lp__mainCh { font-size: 26px; line-height: 1; display: inline-block; }
.lp__mainCh--pop { animation: lpPop $dur-quick $ease-pop; }

.lp__ring { position: absolute; left: 8px; right: 8px; bottom: -10px; height: 4px; border-radius: $r-xs; background: rgba($subject-cream, .28); overflow: hidden; }
.lp__ringFill { display: block; width: 100%; height: 100%; background: $subject-cream; transform: scaleX(0); transform-origin: left center; }

// 부채꼴: 각 변형은 --i 로 받은 자기 순번만큼 회전해 자리를 잡고, 다시 반대로 회전해 글자를 세운다
// (rotate → translateY → rotate). transform·opacity 만 쓰므로 위치가 바뀌어도 레이아웃은 안 움직인다.
.lp__fan {
  position: absolute; left: 50%; bottom: 100%; margin-bottom: $sp-2; width: 0; height: 0; list-style: none;
}
.lp__variant {
  position: absolute; left: 0; top: 0; width: 40px; height: 40px; margin: -20px 0 0 -20px; border: none; border-radius: 50%;
  background: rgba($subject-cream, .92); display: flex; align-items: center; justify-content: center; font-size: 18px;
  box-shadow: $shadow-press; cursor: pointer; opacity: 0;
  transform: rotate(calc((var(--i) - 2) * 20deg)) translateY(0) rotate(calc((var(--i) - 2) * -20deg)) scale(.5);
  transition: transform $dur-base $ease-spring, opacity $dur-quick $ease-out, box-shadow $dur-quick $ease-out;
  transition-delay: calc(var(--i) * 18ms);
}
.lp__fan--open .lp__variant {
  opacity: 1;
  transform: rotate(calc((var(--i) - 2) * 20deg)) translateY(-58px) rotate(calc((var(--i) - 2) * -20deg)) scale(1);
}
.lp__variant--hover { box-shadow: 0 0 0 3px $subject-cream, $shadow-raised; transform: rotate(calc((var(--i) - 2) * 20deg)) translateY(-64px) rotate(calc((var(--i) - 2) * -20deg)) scale(1.25) !important; }

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

@keyframes lpPop { 0% { transform: scale(.6); } 60% { transform: scale(1.22); } 100% { transform: scale(1); } }

@media (max-width: 340px) {
  .lp__main { width: 48px; height: 48px; }
  .lp__mainCh { font-size: 22px; }
  .lp__variant { width: 34px; height: 34px; margin: -17px 0 0 -17px; font-size: 15px; }
  .lp__fan--open .lp__variant { transform: rotate(calc((var(--i) - 2) * 20deg)) translateY(-46px) rotate(calc((var(--i) - 2) * -20deg)) scale(1); }
}

@media (prefers-reduced-motion: reduce) {
  .lp__mainCh--pop { animation: none; }
  .lp__ringFill { transition: none; }
  .lp__variant { transition: none; transition-delay: 0ms; }
}

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);
}

.lp {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.lp__wrap {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lp__main {
  position: relative;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 247, 230, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  cursor: pointer;
  touch-action: none;
}

.lp__mainCh {
  font-size: 26px;
  line-height: 1;
  display: inline-block;
}

.lp__mainCh--pop {
  animation: lpPop 220ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.lp__ring {
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: -10px;
  height: 4px;
  border-radius: 4px;
  background: rgba(255, 247, 230, 0.28);
  overflow: hidden;
}

.lp__ringFill {
  display: block;
  width: 100%;
  height: 100%;
  background: #fff7e6;
  transform: scaleX(0);
  transform-origin: left center;
}

.lp__fan {
  position: absolute;
  left: 50%;
  bottom: 100%;
  margin-bottom: 8px;
  width: 0;
  height: 0;
  list-style: none;
}

.lp__variant {
  position: absolute;
  left: 0;
  top: 0;
  width: 40px;
  height: 40px;
  margin: -20px 0 0 -20px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 247, 230, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  cursor: pointer;
  opacity: 0;
  transform: rotate(calc((var(--i) - 2) * 20deg)) translateY(0) rotate(calc((var(--i) - 2) * -20deg)) scale(0.5);
  transition: transform 300ms cubic-bezier(0.2, 0.8, 0.2, 1), opacity 220ms ease-out, box-shadow 220ms ease-out;
  transition-delay: calc(var(--i) * 18ms);
}

.lp__fan--open .lp__variant {
  opacity: 1;
  transform: rotate(calc((var(--i) - 2) * 20deg)) translateY(-58px) rotate(calc((var(--i) - 2) * -20deg)) scale(1);
}

.lp__variant--hover {
  box-shadow: 0 0 0 3px #fff7e6, 0 14px 24px rgba(23, 20, 26, 0.32);
  transform: rotate(calc((var(--i) - 2) * 20deg)) translateY(-64px) rotate(calc((var(--i) - 2) * -20deg)) scale(1.25) !important;
}

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

@keyframes lpPop {
  0% {
    transform: scale(0.6);
  }
  60% {
    transform: scale(1.22);
  }
  100% {
    transform: scale(1);
  }
}
@media (max-width: 340px) {
  .lp__main {
    width: 48px;
    height: 48px;
  }
  .lp__mainCh {
    font-size: 22px;
  }
  .lp__variant {
    width: 34px;
    height: 34px;
    margin: -17px 0 0 -17px;
    font-size: 15px;
  }
  .lp__fan--open .lp__variant {
    transform: rotate(calc((var(--i) - 2) * 20deg)) translateY(-46px) rotate(calc((var(--i) - 2) * -20deg)) scale(1);
  }
}
@media (prefers-reduced-motion: reduce) {
  .lp__mainCh--pop {
    animation: none;
  }
  .lp__ringFill {
    transition: none;
  }
  .lp__variant {
    transition: none;
    transition-delay: 0ms;
  }
}

(function () {
  var EMOJI_LONGPRESS_THRESHOLD_MS = 550;
  var VARIANTS = [
    { ch: '\u{1F44D}', label: '좋아요' }, { ch: '\u{2764}\u{FE0F}', label: '사랑해요' },
    { ch: '\u{1F602}', label: '웃겨요' }, { ch: '\u{1F62E}', label: '놀라워요' },
    { ch: '\u{1F622}', label: '슬퍼요' }
  ];

  var root = document.getElementById('lp');
  var main = document.getElementById('lpMain');
  var mainCh = document.getElementById('lpMainCh');
  var ringFill = document.getElementById('lpRingFill');
  var fan = document.getElementById('lpFan');
  var live = document.getElementById('lpLive');

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

  var variantEls = [];
  VARIANTS.forEach(function (v, i) {
    var b = document.createElement('button');
    b.type = 'button'; b.className = 'lp__variant'; b.dataset.i = String(i);
    b.setAttribute('role', 'menuitem'); b.setAttribute('aria-label', v.label);
    b.style.setProperty('--i', String(i));
    b.textContent = v.ch;
    fan.appendChild(b);
    variantEls.push(b);
  });

  // 계산 겹: pointerdown 시각을 performance.now() 로 저장해 두고 매 프레임 지금 시각과의 차(누른
  // 시간 값)를 문턱과 비교한다 — 그 값을 그대로 링 채움 비율로 써서 문턱까지 남은 거리를 보여주고,
  // 값이 문턱을 넘는 순간에만 변형이 펼쳐진다.
  var pressing = false, pressStart = 0, fanOpened = false, rafId = 0, hoverIndex = -1;

  function tick() {
    if (!pressing) return;
    var elapsed = performance.now() - pressStart;
    var pct = Math.min(1, elapsed / EMOJI_LONGPRESS_THRESHOLD_MS);
    ringFill.style.transform = 'scaleX(' + pct + ')';
    if (pct >= 1 && !fanOpened) openFan();
    rafId = requestAnimationFrame(tick);
  }

  function openFan() {
    fanOpened = true;
    fan.hidden = false;
    requestAnimationFrame(function () { fan.classList.add('lp__fan--open'); });
    live.textContent = '변형 ' + VARIANTS.length + '개 펼쳐짐';
  }

  function closeFan() {
    fan.classList.remove('lp__fan--open');
    variantEls.forEach(function (b) { b.classList.remove('lp__variant--hover'); });
    hoverIndex = -1;
    window.setTimeout(function () { if (!fanOpened) fan.hidden = true; }, 220);
  }

  function selectDefault() {
    mainCh.classList.remove('lp__mainCh--pop'); void mainCh.offsetWidth; mainCh.classList.add('lp__mainCh--pop');
    live.textContent = VARIANTS[0].label + ' 선택됨';
  }

  function selectVariant(i) {
    mainCh.textContent = VARIANTS[i].ch;
    mainCh.classList.remove('lp__mainCh--pop'); void mainCh.offsetWidth; mainCh.classList.add('lp__mainCh--pop');
    live.textContent = VARIANTS[i].label + ' 선택됨';
  }

  function setHover(i) {
    if (hoverIndex === i) return;
    if (hoverIndex >= 0) variantEls[hoverIndex].classList.remove('lp__variant--hover');
    hoverIndex = i;
    if (i >= 0) variantEls[i].classList.add('lp__variant--hover');
  }

  function press() {
    pressing = true; pressStart = performance.now(); fanOpened = false; hoverIndex = -1;
    ringFill.style.transform = 'scaleX(0)';
    rafId = requestAnimationFrame(tick);
  }

  function release() {
    if (!pressing) return;
    pressing = false;
    cancelAnimationFrame(rafId);
    ringFill.style.transform = 'scaleX(0)';
    if (fanOpened) {
      if (hoverIndex >= 0) selectVariant(hoverIndex); else live.textContent = '닫힘';
      closeFan();
    } else {
      selectDefault();
    }
  }

  main.addEventListener('pointerdown', function () { human(); press(); });
  window.addEventListener('pointerup', function () { release(); });
  main.addEventListener('pointercancel', function () { release(); });

  var mounted = false;

  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  var steps = [
    { hold: 240, hover: -1 },
    { hold: 780, hover: 1 },
    { hold: 240, hover: -1 },
    { hold: 900, hover: 3 }
  ];
  var si = 0, loopTimer = 0;
  function runStep() {
    if (!root.classList.contains('is-demo')) return;
    var s = steps[si % steps.length];
    synthetic = true; main.dispatchEvent(new PointerEvent('pointerdown', { bubbles: true, pointerId: 1 })); synthetic = false;
    var mid = Math.round(s.hold * .78);
    window.setTimeout(function () {
      if (s.hover >= 0 && fanOpened) setHover(s.hover);
    }, mid);
    window.setTimeout(function () {
      synthetic = true; window.dispatchEvent(new PointerEvent('pointerup', { bubbles: true, pointerId: 1 })); synthetic = false;
      si++;
      loopTimer = window.setTimeout(runStep, 520);
    }, s.hold);
  }
  if (!reduce) { loopTimer = window.setTimeout(runStep, 400); }
  else { root.classList.remove('is-demo'); }
  mounted = true;
})();

// EmojiPickerVariantLongpressFan — vanilla 판(run/402/demo/05-.../index.html) 의 React 포트.
// 계산 겹: pointerdown 시각을 performance.now() 로 저장해 두고 매 프레임 지금 시각과의 차(누른
// 시간 값)를 문턱과 비교한다 — 그 값을 그대로 링 채움 비율로 써서, 값이 문턱을 넘는 순간에만
// 반응 변형이 부채꼴로 펼쳐진다.
import { useEffect, useRef, useState } from "react";
import styles from "./EmojiPickerVariantLongpressFan.module.scss";

type Box<T> = { current: T };

const EMOJI_LONGPRESS_THRESHOLD_MS = 550;
const VARIANTS = [
  { ch: "\u{1F44D}", label: "좋아요" },
  { ch: "\u{2764}\u{FE0F}", label: "사랑해요" },
  { ch: "\u{1F602}", label: "웃겨요" },
  { ch: "\u{1F62E}", label: "놀라워요" },
  { ch: "\u{1F622}", label: "슬퍼요" },
];

export default function EmojiPickerVariantLongpressFan() {
  const [isDemo, setIsDemo] = useState(true);
  const [fanOpen, setFanOpen] = useState(false);
  const [hoverIndex, setHoverIndex] = useState(-1);
  const [ch, setCh] = useState(VARIANTS[0].ch);
  const [pop, setPop] = useState(0);

  const isDemoRef = useRef(true) as unknown as Box<boolean>;
  const synthRef = useRef(false) as unknown as Box<boolean>;
  const pressingRef = useRef(false) as unknown as Box<boolean>;
  const pressStartRef = useRef(0) as unknown as Box<number>;
  const fanOpenedRef = useRef(false) as unknown as Box<boolean>;
  const hoverIndexRef = useRef(-1) as unknown as Box<number>;
  const rafRef = useRef(0) as unknown as Box<number>;
  const loopTimerRef = useRef(0) as unknown as Box<number>;
  const liveRef = useRef(null) as unknown as Box<HTMLParagraphElement>;
  const ringRef = useRef(null) as unknown as Box<HTMLSpanElement>;

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

  function tick() {
    if (!pressingRef.current) return;
    const elapsed = performance.now() - pressStartRef.current;
    const pct = Math.min(1, elapsed / EMOJI_LONGPRESS_THRESHOLD_MS);
    if (ringRef.current) ringRef.current.style.transform = "scaleX(" + pct + ")";
    if (pct >= 1 && !fanOpenedRef.current) openFan();
    rafRef.current = requestAnimationFrame(tick);
  }

  function openFan() {
    fanOpenedRef.current = true;
    setFanOpen(true);
    if (liveRef.current) liveRef.current.textContent = "변형 " + VARIANTS.length + "개 펼쳐짐";
  }

  function closeFan(commit: boolean) {
    setFanOpen(false);
    setHoverIndex(-1);
    hoverIndexRef.current = -1;
    if (!commit && liveRef.current) liveRef.current.textContent = "닫힘";
    fanOpenedRef.current = false;
  }

  function selectDefault() {
    setCh(VARIANTS[0].ch);
    setPop((p) => p + 1);
    if (liveRef.current) liveRef.current.textContent = VARIANTS[0].label + " 선택됨";
  }

  function selectVariant(i: number) {
    setCh(VARIANTS[i].ch);
    setPop((p) => p + 1);
    if (liveRef.current) liveRef.current.textContent = VARIANTS[i].label + " 선택됨";
  }

  function setHover(i: number) {
    if (hoverIndexRef.current === i) return;
    hoverIndexRef.current = i;
    setHoverIndex(i);
  }

  function press() {
    pressingRef.current = true;
    pressStartRef.current = performance.now();
    fanOpenedRef.current = false;
    hoverIndexRef.current = -1;
    setHoverIndex(-1);
    if (ringRef.current) ringRef.current.style.transform = "scaleX(0)";
    rafRef.current = requestAnimationFrame(tick);
  }

  function release() {
    if (!pressingRef.current) return;
    pressingRef.current = false;
    cancelAnimationFrame(rafRef.current);
    if (ringRef.current) ringRef.current.style.transform = "scaleX(0)";
    if (fanOpenedRef.current) {
      const hi = hoverIndexRef.current;
      if (hi >= 0) selectVariant(hi);
      closeFan(hi >= 0);
    } else {
      selectDefault();
    }
  }

  useEffect(() => {
    function onUp() { release(); }
    window.addEventListener("pointerup", onUp);
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    const steps = [
      { hold: 240, hover: -1 },
      { hold: 780, hover: 1 },
      { hold: 240, hover: -1 },
      { hold: 900, hover: 3 },
    ];
    let si = 0;
    function runStep() {
      if (!isDemoRef.current) return;
      const s = steps[si % steps.length];
      synthRef.current = true; press(); synthRef.current = false;
      const mid = Math.round(s.hold * 0.78);
      window.setTimeout(() => { if (s.hover >= 0 && fanOpenedRef.current) setHover(s.hover); }, mid);
      window.setTimeout(() => {
        synthRef.current = true; release(); synthRef.current = false;
        si++;
        loopTimerRef.current = window.setTimeout(runStep, 520);
      }, s.hold);
    }
    if (!reduce) { loopTimerRef.current = window.setTimeout(runStep, 400); }
    else { isDemoRef.current = false; setIsDemo(false); }
    return () => { window.removeEventListener("pointerup", onUp); window.clearTimeout(loopTimerRef.current); cancelAnimationFrame(rafRef.current); };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  return (
    <main className={styles.stage}>
      <div className={styles.lp + " " + (isDemo ? styles.isDemo : "")}>
        <div className={styles.wrap}>
          <div
            className={styles.fan + " " + (fanOpen ? styles.fanOpen : "")}
            role="menu"
            aria-label="반응 변형"
            hidden={!fanOpen && !isDemo}
          >
            {VARIANTS.map((v, i) => (
              <button
                key={v.label}
                type="button"
                className={styles.variant + " " + (hoverIndex === i ? styles.variantHover : "")}
                role="menuitem"
                aria-label={v.label}
                style={{ "--i": i } as any}
              >
                {v.ch}
              </button>
            ))}
          </div>
          <button
            className={styles.main}
            type="button"
            aria-label="좋아요"
            onPointerDown={() => { human(); press(); }}
            onPointerCancel={() => release()}
          >
            <span key={pop} className={styles.mainCh + " " + styles.mainChPop}>{ch}</span>
            <span className={styles.ring} aria-hidden="true">
              <span className={styles.ringFill} ref={ringRef} />
            </span>
          </button>
        </div>
        <p className={styles.sr} role="status" aria-live="polite" ref={liveRef} />
      </div>
    </main>
  );
}