05Undo toast

<main class="stage">
  <div class="toast is-demo" role="status" aria-live="polite">
    <p class="toast__text">Item deleted</p>
    <button class="toast__undo" type="button">Undo</button>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────
$duration: $dur-base;    // 300ms — 접히며 사라지는 시간
$easing: $ease-out;
$color: $subject-blue-deep;   // 실행 취소 글자 색

// ── 데모 무대 ───────────────────────────────
@include stage($stage-ink);

.toast {
  box-sizing: border-box;
  display: flex; align-items: center; justify-content: space-between; gap: $sp-4;
  width: min(300px, 88vw);
  padding: $sp-4;
  border-radius: $r-card;
  background: $subject-cream;
  color: $subject-ink;
  box-shadow: $shadow-raised;
  transform-origin: top center; // 규칙8: 위 변에서 접혀 사라짐
}
.toast__text { margin: 0; font-weight: 600; font-size: 13px; line-height: 1.4; font-family: inherit; }
.toast__undo {
  flex: none;
  border: 0; background: transparent;
  color: $color; font-weight: 700; font-size: 13px; line-height: 1; font-family: inherit;
  padding: $sp-2 $sp-1;
  cursor: pointer;
  &:hover, &:focus-visible { text-decoration: underline; }
}
.toast.is-cancelled .toast__undo { visibility: hidden; }

// 실측 2026-09-10: 05번은 "실행취소" 버튼이 본체다. 데모는 등장 → 유지 → (취소 없이) 위에서부터 접히며 사라지는
// 한 바퀴를 반복한다 — scaleY 로 접는다(height 는 애니메이션하지 않는다, 원칙 1)
.toast.is-demo {
  animation: undo-loop $dur-loop $easing infinite;
}

@keyframes undo-loop {
  0%   { transform: translateY(16px) scaleY(1); opacity: 0; }
  15%  { transform: translateY(0) scaleY(1); opacity: 1; }
  70%  { transform: translateY(0) scaleY(1); opacity: 1; }
  92%  { transform: translateY(0) scaleY(.35); opacity: .3; }
  100% { transform: translateY(0) scaleY(0); opacity: 0; }
}

// ── 접근성: 움직임 줄이기 설정이면 접히지 않고 보이다 사라진다(opacity만) ────────
@media (prefers-reduced-motion: reduce) {
  .toast.is-demo { animation: none; transform: none; opacity: 1; }
}

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);
}

.toast {
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: min(300px, 88vw);
  padding: 16px;
  border-radius: 16px;
  background: #fff7e6;
  color: #17141a;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  transform-origin: top center;
}

.toast__text {
  margin: 0;
  font-weight: 600;
  font-size: 13px;
  line-height: 1.4;
  font-family: inherit;
}

.toast__undo {
  flex: none;
  border: 0;
  background: transparent;
  color: #0a4fe8;
  font-weight: 700;
  font-size: 13px;
  line-height: 1;
  font-family: inherit;
  padding: 8px 4px;
  cursor: pointer;
}
.toast__undo:hover, .toast__undo:focus-visible {
  text-decoration: underline;
}

.toast.is-cancelled .toast__undo {
  visibility: hidden;
}

.toast.is-demo {
  animation: undo-loop 2s ease-out infinite;
}

@keyframes undo-loop {
  0% {
    transform: translateY(16px) scaleY(1);
    opacity: 0;
  }
  15% {
    transform: translateY(0) scaleY(1);
    opacity: 1;
  }
  70% {
    transform: translateY(0) scaleY(1);
    opacity: 1;
  }
  92% {
    transform: translateY(0) scaleY(0.35);
    opacity: 0.3;
  }
  100% {
    transform: translateY(0) scaleY(0);
    opacity: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .toast.is-demo {
    animation: none;
    transform: none;
    opacity: 1;
  }
}

// 실제 동작: 4초 뒤 사라지지만, 그 전에 "Undo"를 누르면 타이머를 멈추고 문구를 바꾼다
document.querySelectorAll('.toast').forEach(function (t) {
  var btn = t.querySelector('.toast__undo'), msg = t.querySelector('.toast__text');
  var timer = setTimeout(function () { t.classList.add('is-gone'); }, 4000);
  btn.addEventListener('click', function () {
    clearTimeout(timer);
    msg.textContent = 'Cancelled';
    t.classList.add('is-cancelled');
  });
});

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

export type UndoToastProps = {
  message: string;
  undoLabel?: string;
  cancelledMessage?: string;
  onExpire?: () => void;
  /** 몇 ms 뒤 자동으로 onExpire 를 부를지 (기본 4000ms) */
  timeout?: number;
  color?: string;
};

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

export default function UndoToast({
  message,
  undoLabel = "실행 취소",
  cancelledMessage = "취소되었습니다",
  onExpire,
  timeout = 4000,
  color = "#0a4fe8",
}: UndoToastProps) {
  const [cancelled, setCancelled] = useState(false);
  const timer = useRef<ReturnType<typeof setTimeout> | null>(null);

  if (timer.current === null && onExpire) {
    timer.current = setTimeout(onExpire, timeout);
  }

  const undo = useCallback(() => {
    if (timer.current) clearTimeout(timer.current);
    setCancelled(true);
  }, []);

  const vars: Vars = { "--color": color };

  return (
    <div className={styles.toast} style={vars} role="status" aria-live="polite">
      <p className={styles.text}>{cancelled ? cancelledMessage : message}</p>
      {!cancelled && (
        <button className={styles.undo} type="button" onClick={undo}>
          {undoLabel}
        </button>
      )}
    </div>
  );
}