09길게 눌러 확인

<main class="stage"><button class="btn is-demo" type="button"><span class="btn__fill" aria-hidden="true"></span><span class="btn__label">길게 눌러 삭제</span></button></main>

// ── 변수 3개 ──────────────────────────────────────────
$hold: 1.2s;                                     // 이만큼 누르고 있어야 실행된다
$color: #fff7e6;
$fill: #17141a;

html, body { margin: 0; overflow: hidden; }          // iframe 안에서 스크롤바가 생기지 않게 (실측 2026-09-09: body 여백 8px 이 100vh 를 넘겼다)
.stage { min-height: 100vh; display: grid; place-items: center; margin: 0; background: #c89a8f; font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif; }

.btn {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  border: 2.5px solid $color;
  border-radius: 14px;
  padding: 20px 44px;
  font-weight: 800;
  font-size: 20px;
  line-height: 1;
  font-family: inherit;
  color: $color;
  background: transparent;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;                            // 모바일에서 길게 누를 때 스크롤·메뉴가 안 뜨게

  &__fill {
    position: absolute; inset: 0;
    background: $fill;
    transform: scaleX(0);
    transform-origin: left;                      // 왼쪽에서 차오른다. 세로면 bottom + scaleY
    z-index: -1;
    transition: transform 200ms ease-out;        // 떼면 되돌아가는 속도
  }
  &.is-holding &__fill { animation: fill $hold linear forwards; }
  &.is-done &__fill    { transform: scaleX(1); }
  &.is-done            { color: $color; }
  &__label { position: relative; }

  &.is-demo &__fill { animation: fill-loop 2s linear infinite; }
}

@keyframes fill      { from { transform: scaleX(0); } to { transform: scaleX(1); } }
@keyframes fill-loop { 0%, 10% { transform: scaleX(0); } 70%, 85% { transform: scaleX(1); } 100% { transform: scaleX(0); } }

@media (prefers-reduced-motion: reduce) {
  .btn__fill { transition: none; }
  .btn.is-demo .btn__fill { animation: none; }
  .btn.is-holding .btn__fill { animation-duration: $hold; }   // 길게 누르기 자체는 유지 — 안전장치라 뺄 수 없다
}

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

.stage {
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #c89a8f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.btn {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  border: 2.5px solid #fff7e6;
  border-radius: 14px;
  padding: 20px 44px;
  font-weight: 800;
  font-size: 20px;
  line-height: 1;
  font-family: inherit;
  color: #fff7e6;
  background: transparent;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}
.btn__fill {
  position: absolute;
  inset: 0;
  background: #17141a;
  transform: scaleX(0);
  transform-origin: left;
  z-index: -1;
  transition: transform 200ms ease-out;
}
.btn.is-holding .btn__fill {
  animation: fill 1.2s linear forwards;
}
.btn.is-done .btn__fill {
  transform: scaleX(1);
}
.btn.is-done {
  color: #fff7e6;
}
.btn__label {
  position: relative;
}
.btn.is-demo .btn__fill {
  animation: fill-loop 2s linear infinite;
}

@keyframes fill {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}
@keyframes fill-loop {
  0%, 10% {
    transform: scaleX(0);
  }
  70%, 85% {
    transform: scaleX(1);
  }
  100% {
    transform: scaleX(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .btn__fill {
    transition: none;
  }
  .btn.is-demo .btn__fill {
    animation: none;
  }
  .btn.is-holding .btn__fill {
    animation-duration: 1.2s;
  }
}

// 누르고 있는 동안 채워진다. 끝까지 차면 실행. 중간에 떼면 되돌아간다.
var b = document.querySelector('.btn'), label = b.querySelector('.btn__label'), done = false;
function start(e) { if (done) return; b.classList.remove('is-demo'); b.classList.add('is-holding'); }
function stop() { if (!done) b.classList.remove('is-holding'); }
b.addEventListener('pointerdown', start);
b.addEventListener('pointerup', stop); b.addEventListener('pointerleave', stop); b.addEventListener('pointercancel', stop);
b.querySelector('.btn__fill').addEventListener('animationend', function (e) {
  if (e.animationName !== 'fill') return;
  done = true; label.textContent = '삭제됨'; b.classList.add('is-done');
  setTimeout(function () { done = false; label.textContent = '길게 눌러 삭제'; b.classList.remove('is-done', 'is-holding'); }, 1400);
});

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

export type HoldButtonProps = { children: ReactNode; doneLabel?: ReactNode; hold?: number; color?: string; fill?: string; onConfirm: () => void };

/** 누르고 있는 동안 차오르고, 다 차면 onConfirm. 중간에 떼면 되돌아간다. */
export default function HoldButton({ children, doneLabel = "완료", hold = 1200, color = "#fff7e6", fill = "#17141a", onConfirm }: HoldButtonProps) {
  const [holding, setHolding] = useState<boolean>(false);
  const [done, setDone] = useState<boolean>(false);
  const vars = { "--hold": `${hold}ms`, "--color": color, "--fill": fill } as CSSProperties;
  const cls = `${styles.btn} ${holding ? styles.holding : ""} ${done ? styles.done : ""}`;
  return (
    <button type="button" className={cls} style={vars}
      onPointerDown={() => !done && setHolding(true)} onPointerUp={() => setHolding(false)} onPointerLeave={() => setHolding(false)} onPointerCancel={() => setHolding(false)}>
      <span className={styles.fill} aria-hidden="true" onAnimationEnd={() => { if (holding) { setDone(true); onConfirm(); } }} />
      <span className={styles.label}>{done ? doneLabel : children}</span>
    </button>
  );
}