03Button Whose Spinner Morphs Into a Success Checkmark

<main class="stage">
<div class="scene is-demo" id="scene">
  <button class="btn" id="btn" type="button">
    <span class="btnTint" id="tint" aria-hidden="true"></span>
    <span class="iconWrap" aria-hidden="true">
      <span class="ringWrap" id="ringWrap">
        <svg viewBox="0 0 24 24" width="18" height="18" class="ringSvg">
          <circle id="ring" cx="12" cy="12" r="9" fill="none" stroke-width="2.5" stroke-linecap="round" stroke-dasharray="34 22"></circle>
        </svg>
      </span>
      <span class="checkWrap" id="checkWrap">
        <svg viewBox="0 0 24 24" width="18" height="18">
          <path id="checkPath" d="M4 12 L9.5 17.5 L20 6" fill="none" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"></path>
        </svg>
      </span>
    </span>
    <span class="btnText" id="text">Confirm order</span>
  </button>
  <span class="visuallyHidden" id="status" role="status" aria-live="polite"></span>
</div>
</main>

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

// 변수 3개
$duration: $dur-quick;
$easing: $ease-out;
$color: $subject-blue-deep;

// 계산 겹: index.html 의 morph() 가 체크 path 의 실측 길이(getTotalLength)를 기준으로
// 링 opacity · 체크 opacity · stroke-dashoffset · 틴트 opacity 를 한 진행률로 동시에 몬다.
@include stage($stage-orange);

.scene {
  display: grid;
  place-items: center;
}

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: $sp-2;
  min-width: 150px;
  height: 44px;
  padding: 0 $sp-5;
  border: none;
  border-radius: $r-control;
  background: $color;
  color: $subject-cream;
  font-weight: 600;
  font-size: 14px;
  line-height: 1;
  box-shadow: $shadow-press;
  cursor: pointer;
  overflow: hidden;

  &:focus-visible { outline: 2px solid $subject-cream; outline-offset: 3px; }
  &:disabled { cursor: default; }
}

.btnTint {
  position: absolute;
  inset: 0;
  background: $subject-mint;
  opacity: 0;
}

.iconWrap {
  position: relative;
  z-index: 1;
  width: 18px;
  height: 18px;
}

.ringWrap,
.checkWrap {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.checkWrap { opacity: 0; }

.ringSvg circle {
  stroke: $subject-cream;
  transform-origin: 12px 12px;
}

.checkWrap svg path {
  stroke: $subject-cream;
}

.btnText {
  position: relative;
  z-index: 1;
  white-space: nowrap;
}

.visuallyHidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

@media (max-width: 340px) {
  .btn { min-width: 130px; height: 40px; padding: 0 $sp-4; font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  // 실사용 경로 적용 — index.html 의 runReduced() 가 회전·드로잉 트윈 없이 즉시 값을 바꾼다.
  // scss 만: 남은 트랜지션을 전부 끈다.
  * { 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: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.scene {
  display: grid;
  place-items: center;
}

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 150px;
  height: 44px;
  padding: 0 20px;
  border: none;
  border-radius: 12px;
  background: #0a4fe8;
  color: #fff7e6;
  font-weight: 600;
  font-size: 14px;
  line-height: 1;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  cursor: pointer;
  overflow: hidden;
}
.btn:focus-visible {
  outline: 2px solid #fff7e6;
  outline-offset: 3px;
}
.btn:disabled {
  cursor: default;
}

.btnTint {
  position: absolute;
  inset: 0;
  background: #4cd4a6;
  opacity: 0;
}

.iconWrap {
  position: relative;
  z-index: 1;
  width: 18px;
  height: 18px;
}

.ringWrap,
.checkWrap {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.checkWrap {
  opacity: 0;
}

.ringSvg circle {
  stroke: #fff7e6;
  transform-origin: 12px 12px;
}

.checkWrap svg path {
  stroke: #fff7e6;
}

.btnText {
  position: relative;
  z-index: 1;
  white-space: nowrap;
}

.visuallyHidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

@media (max-width: 340px) {
  .btn {
    min-width: 130px;
    height: 40px;
    padding: 0 16px;
    font-size: 13px;
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}

(function () {
  var SPIN_MS = 700;
  var DRAW_MS = 420;
  var HOLD_MS = 450;
  var RESET_MS = 220;
  var GAP_MS = 450;
  var START_DELAY_MS = 200;
  var DEG_PER_MS = 360 / 800;

  var scene = document.getElementById('scene');
  var btn = document.getElementById('btn');
  var tint = document.getElementById('tint');
  var ringWrap = document.getElementById('ringWrap');
  var ring = document.getElementById('ring');
  var checkWrap = document.getElementById('checkWrap');
  var checkPath = document.getElementById('checkPath');
  var text = document.getElementById('text');
  var status = document.getElementById('status');
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  var gen = 0;
  var timers = [];
  var rafId = 0;

  // 계산 겹: 체크 path 의 실제 길이를 getTotalLength() 로 실측해 stroke-dasharray/offset 을
  // 그 값으로 맞춘다 — 임의 숫자를 넣으면 선이 끝까지 안 그려지거나 남는다.
  var checkLen = checkPath.getTotalLength();
  checkPath.style.strokeDasharray = String(checkLen);
  checkPath.style.strokeDashoffset = String(checkLen);

  function human() {
    if (scene.classList.contains('is-demo')) {
      scene.classList.remove('is-demo');
      timers.forEach(function (t) { clearTimeout(t); });
      timers = [];
    }
  }

  function easeOutCubic(p) { return 1 - Math.pow(1 - p, 3); }

  function spinLoop(myGen) {
    var start = null;
    function step(now) {
      if (myGen !== gen) return;
      if (start === null) start = now;
      var angle = ((now - start) * DEG_PER_MS) % 360;
      ring.style.transform = 'rotate(' + angle.toFixed(1) + 'deg)';
      rafId = requestAnimationFrame(step);
    }
    rafId = requestAnimationFrame(step);
  }

  // 한 번의 rAF 루프가 링 opacity · 체크 opacity · 체크 draw 길이 · 틴트 opacity 넷을
  // 같은 진행률 p 로 동시에 몰아 "모양이 이어져 바뀐다"는 인상을 만든다.
  function morph(myGen, onDone) {
    var start = null;
    function step(now) {
      if (myGen !== gen) return;
      if (start === null) start = now;
      var p = easeOutCubic(Math.min(1, (now - start) / DRAW_MS));
      ringWrap.style.opacity = String(1 - p);
      checkWrap.style.opacity = String(p);
      checkPath.style.strokeDashoffset = String(checkLen * (1 - p));
      tint.style.opacity = String(p * .5);
      if (p < 1) requestAnimationFrame(step); else onDone();
    }
    requestAnimationFrame(step);
  }

  function reset() {
    cancelAnimationFrame(rafId);
    ring.style.transform = 'rotate(0deg)';
    ringWrap.style.opacity = '1';
    checkWrap.style.opacity = '0';
    checkPath.style.strokeDashoffset = String(checkLen);
    tint.style.opacity = '0';
  }

  function runAnimated() {
    gen++;
    var myGen = gen;
    reset();
    btn.disabled = true;
    btn.setAttribute('aria-busy', 'true');
    status.textContent = 'Processing';
    text.textContent = 'Processing';
    spinLoop(myGen);
    timers.push(setTimeout(function () {
      cancelAnimationFrame(rafId);
      text.textContent = 'Confirmed';
      status.textContent = 'Confirmed';
      morph(myGen, function () {
        timers.push(setTimeout(function () {
          btn.disabled = false;
          btn.removeAttribute('aria-busy');
          text.textContent = 'Confirm order';
          reset();
        }, HOLD_MS));
      });
    }, SPIN_MS));
  }

  function runReduced() {
    gen++;
    reset();
    btn.disabled = true;
    btn.setAttribute('aria-busy', 'true');
    status.textContent = 'Processing';
    text.textContent = 'Processing';
    timers.push(setTimeout(function () {
      text.textContent = 'Confirmed';
      status.textContent = 'Confirmed';
      ringWrap.style.opacity = '0';
      checkWrap.style.opacity = '1';
      checkPath.style.strokeDashoffset = '0';
      tint.style.opacity = '.5';
      timers.push(setTimeout(function () {
        btn.disabled = false;
        btn.removeAttribute('aria-busy');
        text.textContent = 'Confirm order';
        reset();
      }, HOLD_MS));
    }, SPIN_MS));
  }

  btn.addEventListener('click', function () {
    if (btn.disabled) return;
    human();
    if (reduce) runReduced(); else runAnimated();
  });

  // reduce: 실사용 경로 적용 — runReduced() 는 회전·드로잉 트윈 없이 opacity/offset 을 즉시 바꾼다.
  // 아래 자동 루프는 시연 게이트만 — reduce 에서는 돌지 않는다.
  function cycle() {
    if (!scene.classList.contains('is-demo')) return;
    runAnimated();
    timers.push(setTimeout(function () {
      timers.push(setTimeout(cycle, GAP_MS));
    }, SPIN_MS + DRAW_MS + HOLD_MS + RESET_MS));
  }

  if (!reduce) {
    timers.push(setTimeout(cycle, START_DELAY_MS));
  }
})();

import { useEffect, useRef } from 'react';
import styles from './ButtonLoadingSuccessCheckmarkMorph.module.scss';

const SPIN_MS = 700;
const DRAW_MS = 420;
const HOLD_MS = 450;
const RESET_MS = 220;
const GAP_MS = 450;
const START_DELAY_MS = 200;
const DEG_PER_MS = 360 / 800;

export default function ButtonLoadingSuccessCheckmarkMorph() {
  const sceneRef = useRef<HTMLDivElement>(null);
  const btnRef = useRef<HTMLButtonElement>(null);
  const tintRef = useRef<HTMLSpanElement>(null);
  const ringWrapRef = useRef<HTMLSpanElement>(null);
  const ringRef = useRef<SVGCircleElement>(null);
  const checkWrapRef = useRef<HTMLSpanElement>(null);
  const checkPathRef = useRef<SVGPathElement>(null);
  const textRef = useRef<HTMLSpanElement>(null);
  const statusRef = useRef<HTMLSpanElement>(null);

  useEffect(() => {
    const scene = sceneRef.current;
    const btn = btnRef.current;
    const tint = tintRef.current;
    const ringWrap = ringWrapRef.current;
    const ring = ringRef.current;
    const checkWrap = checkWrapRef.current;
    const checkPath = checkPathRef.current;
    const text = textRef.current;
    const status = statusRef.current;
    if (!scene || !btn || !tint || !ringWrap || !ring || !checkWrap || !checkPath || !text || !status) return undefined;
    const reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

    let gen = 0;
    let timers: number[] = [];
    let rafId = 0;

    // 계산 겹: 체크 path 의 실제 길이를 getTotalLength() 로 실측해 stroke-dasharray/offset 을
    // 그 값으로 맞춘다 — 임의 숫자를 넣으면 선이 끝까지 안 그려지거나 남는다.
    const checkLen = checkPath.getTotalLength();
    checkPath.style.strokeDasharray = String(checkLen);
    checkPath.style.strokeDashoffset = String(checkLen);

    function human() {
      if (scene!.classList.contains(styles['is-demo'])) {
        scene!.classList.remove(styles['is-demo']);
        timers.forEach((t) => window.clearTimeout(t));
        timers = [];
      }
    }

    function easeOutCubic(p: number) { return 1 - Math.pow(1 - p, 3); }

    function spinLoop(myGen: number) {
      let start: number | null = null;
      function step(now: number) {
        if (myGen !== gen) return;
        if (start === null) start = now;
        const angle = ((now - start) * DEG_PER_MS) % 360;
        ring!.style.transform = 'rotate(' + angle.toFixed(1) + 'deg)';
        rafId = requestAnimationFrame(step);
      }
      rafId = requestAnimationFrame(step);
    }

    // 한 번의 rAF 루프가 링 opacity · 체크 opacity · 체크 draw 길이 · 틴트 opacity 넷을
    // 같은 진행률 p 로 동시에 몰아 "모양이 이어져 바뀐다"는 인상을 만든다.
    function morph(myGen: number, onDone: () => void) {
      let start: number | null = null;
      function step(now: number) {
        if (myGen !== gen) return;
        if (start === null) start = now;
        const p = easeOutCubic(Math.min(1, (now - start) / DRAW_MS));
        ringWrap!.style.opacity = String(1 - p);
        checkWrap!.style.opacity = String(p);
        checkPath!.style.strokeDashoffset = String(checkLen * (1 - p));
        tint!.style.opacity = String(p * .5);
        if (p < 1) requestAnimationFrame(step); else onDone();
      }
      requestAnimationFrame(step);
    }

    function reset() {
      cancelAnimationFrame(rafId);
      ring!.style.transform = 'rotate(0deg)';
      ringWrap!.style.opacity = '1';
      checkWrap!.style.opacity = '0';
      checkPath!.style.strokeDashoffset = String(checkLen);
      tint!.style.opacity = '0';
    }

    function runAnimated() {
      gen++;
      const myGen = gen;
      reset();
      btn!.disabled = true;
      btn!.setAttribute('aria-busy', 'true');
      status!.textContent = '처리하는 중';
      text!.textContent = 'Processing';
      spinLoop(myGen);
      timers.push(window.setTimeout(() => {
        cancelAnimationFrame(rafId);
        text!.textContent = 'Confirmed';
        status!.textContent = '처리 완료';
        morph(myGen, () => {
          timers.push(window.setTimeout(() => {
            btn!.disabled = false;
            btn!.removeAttribute('aria-busy');
            text!.textContent = 'Confirm order';
            reset();
          }, HOLD_MS));
        });
      }, SPIN_MS));
    }

    function runReduced() {
      gen++;
      reset();
      btn!.disabled = true;
      btn!.setAttribute('aria-busy', 'true');
      status!.textContent = '처리하는 중';
      text!.textContent = 'Processing';
      timers.push(window.setTimeout(() => {
        text!.textContent = 'Confirmed';
        status!.textContent = '처리 완료';
        ringWrap!.style.opacity = '0';
        checkWrap!.style.opacity = '1';
        checkPath!.style.strokeDashoffset = '0';
        tint!.style.opacity = '.5';
        timers.push(window.setTimeout(() => {
          btn!.disabled = false;
          btn!.removeAttribute('aria-busy');
          text!.textContent = 'Confirm order';
          reset();
        }, HOLD_MS));
      }, SPIN_MS));
    }

    function onClick() {
      if (btn!.disabled) return;
      human();
      if (reduce) runReduced(); else runAnimated();
    }
    btn.addEventListener('click', onClick);

    // reduce: 실사용 경로 적용 — runReduced() 는 회전·드로잉 트윈 없이 opacity/offset 을 즉시 바꾼다.
    // 아래 자동 루프는 시연 게이트만 — reduce 에서는 돌지 않는다.
    function cycle() {
      if (!scene!.classList.contains(styles['is-demo'])) return;
      runAnimated();
      timers.push(window.setTimeout(() => {
        timers.push(window.setTimeout(cycle, GAP_MS));
      }, SPIN_MS + DRAW_MS + HOLD_MS + RESET_MS));
    }

    if (!reduce) {
      timers.push(window.setTimeout(cycle, START_DELAY_MS));
    }

    return () => {
      btn.removeEventListener('click', onClick);
      timers.forEach((t) => window.clearTimeout(t));
      cancelAnimationFrame(rafId);
    };
  }, []);

  return (
    <main className={styles.stage}>
      <div className={styles.scene + ' ' + styles['is-demo']} ref={sceneRef}>
        <button className={styles.btn} ref={btnRef} type="button">
          <span className={styles.btnTint} ref={tintRef} aria-hidden="true" />
          <span className={styles.iconWrap} aria-hidden="true">
            <span className={styles.ringWrap} ref={ringWrapRef}>
              <svg viewBox="0 0 24 24" width="18" height="18" className={styles.ringSvg}>
                <circle ref={ringRef} cx="12" cy="12" r="9" fill="none" strokeWidth="2.5" strokeLinecap="round" strokeDasharray="34 22" />
              </svg>
            </span>
            <span className={styles.checkWrap} ref={checkWrapRef}>
              <svg viewBox="0 0 24 24" width="18" height="18">
                <path ref={checkPathRef} d="M4 12 L9.5 17.5 L20 6" fill="none" strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round" />
              </svg>
            </span>
          </span>
          <span className={styles.btnText} ref={textRef}>Confirm order</span>
        </button>
        <span className={styles.visuallyHidden} ref={statusRef} role="status" aria-live="polite" />
      </div>
    </main>
  );
}