04숫자가 굴러 올라가는 좋아요

<main class="stage">
  <div class="lk is-demo">
    <button class="lk__btn" id="lk-btn" type="button" aria-pressed="false" aria-label="좋아요 누르기">
      <span class="lk__heart" aria-hidden="true"><svg viewBox="0 0 256 256" width="22" height="22"><g fill="currentColor"><path d="M232 102c0 66-104 122-104 122S24 168 24 102a54 54 0 0 1 54-54c22.59 0 41.94 12.31 50 32c8.06-19.69 27.41-32 50-32a54 54 0 0 1 54 54" opacity=".2"/><path d="M178 40c-20.65 0-38.73 8.88-50 23.89C116.73 48.88 98.65 40 78 40a62.07 62.07 0 0 0-62 62c0 70 103.79 126.66 108.21 129a8 8 0 0 0 7.58 0C136.21 228.66 240 172 240 102a62.07 62.07 0 0 0-62-62m-50 174.8c-18.26-10.64-96-59.11-96-112.8a46.06 46.06 0 0 1 46-46c19.45 0 35.78 10.36 42.6 27a8 8 0 0 0 14.8 0c6.82-16.67 23.15-27 42.6-27a46.06 46.06 0 0 1 46 46c0 53.61-77.76 102.15-96 112.8"/></g></svg></span>
      <span class="lk__win" aria-live="polite">
        <span class="lk__roll">
          <span class="lk__n">1,248</span>
          <span class="lk__n">1,249</span>
        </span>
      </span>
    </button>
    <p class="lk__note">숫자가 갈아끼워지지 않고 굴러 올라갑니다</p>
  </div>
</main>

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

$duration: $dur-quick;
$easing: $ease-pop;
$color: $stage-orange;

@include stage($stage-paper);

.lk {
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-3;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.lk__btn {
  box-sizing: border-box;
  margin: 0;
  padding: $sp-2 $sp-5;
  display: inline-flex;
  align-items: center;
  gap: $sp-2;
  height: 48px;
  border: 2px solid $subject-ink;
  border-radius: $r-pill;
  background-color: transparent;
  color: $subject-ink;
  cursor: pointer;
}
.lk__btn:focus-visible { outline: 3px solid $subject-blue; outline-offset: 3px; }

.lk__heart { display: inline-flex; flex: 0 0 auto; }
.lk__heart svg { display: block; }

// 숫자 창 — 높이를 한 줄로 못 박고 그 안에서 두 값이 세로로 오간다
.lk__win {
  display: block;
  overflow: hidden;
  height: 22px;
  width: 46px;
}
.lk__roll {
  display: block;
  transform: translateY(0);
}
.lk__n {
  display: block;
  height: 22px;
  font-size: 15px;
  line-height: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

// 사람이 실제로 누른 경로
.lk:not(.is-demo) .lk__roll { transition: transform $duration $easing; }
.lk:not(.is-demo) .lk__btn[aria-pressed="true"] .lk__roll { transform: translateY(-22px); }
.lk:not(.is-demo) .lk__btn[aria-pressed="true"] { border-color: $color; color: $color; }

.lk__btn.is-beat .lk__heart {
  animation-name: lk-beat;
  animation-duration: $dur-base;
  animation-timing-function: $easing;
  animation-iteration-count: 1;
}
@keyframes lk-beat {
  0%   { transform: scale(1); }
  35%  { transform: scale(1.45); }
  70%  { transform: scale(.92); }
  100% { transform: scale(1); }
}

.lk__note {
  margin: 0;
  max-width: 260px;
  text-align: center;
  font-size: 12px;
  line-height: 18px;
  font-weight: 500;
  color: $subject-ink;
}

// ── 자동 루프: 35% 에 누르고 80% 에 다시 눌러 되돌린다. 굴림은 transform 이라 중간 프레임이 유령이 되지 않는다 ──
.lk.is-demo .lk__roll {
  animation-name: lk-roll;
  animation-duration: $dur-loop;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
}
@keyframes lk-roll {
  0%   { transform: translateY(0); }
  32%  { transform: translateY(0); }
  44%  { transform: translateY(-22px); }
  78%  { transform: translateY(-22px); }
  88%  { transform: translateY(0); }
  100% { transform: translateY(0); }
}

.lk.is-demo .lk__heart {
  animation-name: lk-beat-loop;
  animation-duration: $dur-loop;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
}
@keyframes lk-beat-loop {
  0%   { transform: scale(1); }
  32%  { transform: scale(1); }
  40%  { transform: scale(1.5); }
  50%  { transform: scale(.94); }
  58%  { transform: scale(1); }
  78%  { transform: scale(1); }
  84%  { transform: scale(1.2); }
  90%  { transform: scale(1); }
  100% { transform: scale(1); }
}

.lk.is-demo .lk__btn {
  animation-name: lk-skin;
  animation-duration: $dur-loop;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
@keyframes lk-skin {
  0%   { border-color: $subject-ink; color: $subject-ink; }
  36%  { border-color: $color; color: $color; }
  82%  { border-color: $subject-ink; color: $subject-ink; }
  100% { border-color: $subject-ink; color: $subject-ink; }
}

@media (max-width: 340px) {
  .lk { gap: $sp-2; }
  .lk__btn { height: 44px; padding: $sp-2 $sp-4; }
  .lk__note { font-size: 11px; line-height: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .lk.is-demo .lk__roll,
  .lk.is-demo .lk__heart,
  .lk.is-demo .lk__btn,
  .lk__btn.is-beat .lk__heart { animation: none !important; }
  .lk:not(.is-demo) .lk__roll { transition: none !important; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffffff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.lk {
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.lk__btn {
  box-sizing: border-box;
  margin: 0;
  padding: 8px 20px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 48px;
  border: 2px solid #17141a;
  border-radius: 999px;
  background-color: transparent;
  color: #17141a;
  cursor: pointer;
}

.lk__btn:focus-visible {
  outline: 3px solid #2f6df6;
  outline-offset: 3px;
}

.lk__heart {
  display: inline-flex;
  flex: 0 0 auto;
}

.lk__heart svg {
  display: block;
}

.lk__win {
  display: block;
  overflow: hidden;
  height: 22px;
  width: 46px;
}

.lk__roll {
  display: block;
  transform: translateY(0);
}

.lk__n {
  display: block;
  height: 22px;
  font-size: 15px;
  line-height: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.lk:not(.is-demo) .lk__roll {
  transition: transform 220ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.lk:not(.is-demo) .lk__btn[aria-pressed=true] .lk__roll {
  transform: translateY(-22px);
}

.lk:not(.is-demo) .lk__btn[aria-pressed=true] {
  border-color: #ff4d1f;
  color: #ff4d1f;
}

.lk__btn.is-beat .lk__heart {
  animation-name: lk-beat;
  animation-duration: 300ms;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: 1;
}

@keyframes lk-beat {
  0% {
    transform: scale(1);
  }
  35% {
    transform: scale(1.45);
  }
  70% {
    transform: scale(0.92);
  }
  100% {
    transform: scale(1);
  }
}
.lk__note {
  margin: 0;
  max-width: 260px;
  text-align: center;
  font-size: 12px;
  line-height: 18px;
  font-weight: 500;
  color: #17141a;
}

.lk.is-demo .lk__roll {
  animation-name: lk-roll;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: infinite;
}

@keyframes lk-roll {
  0% {
    transform: translateY(0);
  }
  32% {
    transform: translateY(0);
  }
  44% {
    transform: translateY(-22px);
  }
  78% {
    transform: translateY(-22px);
  }
  88% {
    transform: translateY(0);
  }
  100% {
    transform: translateY(0);
  }
}
.lk.is-demo .lk__heart {
  animation-name: lk-beat-loop;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: infinite;
}

@keyframes lk-beat-loop {
  0% {
    transform: scale(1);
  }
  32% {
    transform: scale(1);
  }
  40% {
    transform: scale(1.5);
  }
  50% {
    transform: scale(0.94);
  }
  58% {
    transform: scale(1);
  }
  78% {
    transform: scale(1);
  }
  84% {
    transform: scale(1.2);
  }
  90% {
    transform: scale(1);
  }
  100% {
    transform: scale(1);
  }
}
.lk.is-demo .lk__btn {
  animation-name: lk-skin;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

@keyframes lk-skin {
  0% {
    border-color: #17141a;
    color: #17141a;
  }
  36% {
    border-color: #ff4d1f;
    color: #ff4d1f;
  }
  82% {
    border-color: #17141a;
    color: #17141a;
  }
  100% {
    border-color: #17141a;
    color: #17141a;
  }
}
@media (max-width: 340px) {
  .lk {
    gap: 8px;
  }
  .lk__btn {
    height: 44px;
    padding: 8px 16px;
  }
  .lk__note {
    font-size: 11px;
    line-height: 16px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .lk.is-demo .lk__roll,
  .lk.is-demo .lk__heart,
  .lk.is-demo .lk__btn,
  .lk__btn.is-beat .lk__heart {
    animation: none !important;
  }
  .lk:not(.is-demo) .lk__roll {
    transition: none !important;
  }
}

// 실제 동작: 누른 상태와 숫자를 따로 두지 않는다. aria-pressed 하나가 하트 색과 굴림 위치를 같이 정한다
var root = document.querySelector('.lk');
var btn = document.getElementById('lk-btn');
btn.addEventListener('click', function () {
  root.classList.remove('is-demo');
  var on = btn.getAttribute('aria-pressed') === 'true';
  btn.setAttribute('aria-pressed', String(!on));
  btn.classList.remove('is-beat');
  void btn.offsetWidth;           // 연달아 눌러도 하트 반동이 매번 돌게 리플로를 강제한다
  btn.classList.add('is-beat');
});

import { useState } from "react";
import type { CSSProperties } from "react";
import styles from "./LikeCountButton.module.scss";

export type LikeCountButtonProps = {
  label?: string;
  note?: string;
  count?: number;
  duration?: number;
  easing?: string;
  color?: string;
};

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

// 1248 → "1,248" — 세 자리마다 쉼표
function fmt(n: number): string {
  const s = String(n);
  let out = "";
  for (let i = 0; i < s.length; i += 1) {
    if (i > 0 && (s.length - i) % 3 === 0) out += ",";
    out += s.charAt(i);
  }
  return out;
}

export default function LikeCountButton({
  label = "Like this post",
  note = "The number rolls up instead of being swapped",
  count = 1248,
  duration = 220,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#ff4d1f",
}: LikeCountButtonProps) {
  const [demo, setDemo] = useState(true);
  const [on, setOn] = useState(false);
  const [beat, setBeat] = useState(0);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  // 누른 상태 하나가 하트 색과 굴림 위치를 같이 정한다
  function press() {
    setDemo(false);
    setOn((v) => !v);
    setBeat((v) => v + 1); // key 를 바꿔 연달아 눌러도 하트 반동이 매번 다시 돈다
  }

  return (
    <div className={`${styles.lk} ${demo ? styles.isDemo : ""}`} style={vars}>
      <button className={styles.btn} type="button" aria-pressed={on} aria-label={label} onClick={press}>
        <span key={beat} className={`${styles.heart} ${demo ? "" : styles.isBeat}`} aria-hidden="true">
          <svg viewBox="0 0 256 256" width="22" height="22">
            <g fill="currentColor">
              <path d="M232 102c0 66-104 122-104 122S24 168 24 102a54 54 0 0 1 54-54c22.59 0 41.94 12.31 50 32c8.06-19.69 27.41-32 50-32a54 54 0 0 1 54 54" opacity=".2" />
              <path d="M178 40c-20.65 0-38.73 8.88-50 23.89C116.73 48.88 98.65 40 78 40a62.07 62.07 0 0 0-62 62c0 70 103.79 126.66 108.21 129a8 8 0 0 0 7.58 0C136.21 228.66 240 172 240 102a62.07 62.07 0 0 0-62-62m-50 174.8c-18.26-10.64-96-59.11-96-112.8a46.06 46.06 0 0 1 46-46c19.45 0 35.78 10.36 42.6 27a8 8 0 0 0 14.8 0c6.82-16.67 23.15-27 42.6-27a46.06 46.06 0 0 1 46 46c0 53.61-77.76 102.15-96 112.8" />
            </g>
          </svg>
        </span>
        <span className={styles.win} aria-live="polite">
          <span className={styles.roll}>
            <span className={styles.n}>{fmt(count)}</span>
            <span className={styles.n}>{fmt(count + 1)}</span>
          </span>
        </span>
      </button>
      <p className={styles.note}>{note}</p>
    </div>
  );
}