04Progress-bar auto-dismiss

<main class="stage">
  <div class="toast is-demo" role="status" aria-live="polite">
    <div class="toast__body">
      <p class="toast__title">Upload complete</p>
      <p class="toast__text">Closes automatically in 5 seconds</p>
    </div>
    <span class="toast__bar" aria-hidden="true"></span>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────
$duration: 5000ms;       // 진행바가 다 닳아 닫히기까지 실제 시간 (UI 모션이 아니라 타이머 값이라 토큰 밖)
$easing: linear;         // 진행바는 등속으로 — 급가속하면 "얼마 남았는지" 신뢰가 깨진다
$color: $subject-blue;   // 진행바 색

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

.toast {
  position: relative;
  overflow: hidden;
  width: min(280px, 84vw);
  padding: $sp-4;
  border-radius: $r-card;
  background: $subject-ink;
  color: $subject-cream;
  box-shadow: $shadow-raised;
}
.toast__title { margin: 0 0 $sp-1; font-weight: 700; font-size: 15px; line-height: 1.3; font-family: inherit; }
.toast__text { margin: 0; font-weight: 400; font-size: 13px; line-height: 1.4; font-family: inherit; opacity: .78; }
.toast__bar {
  position: absolute; left: 0; bottom: 0;
  width: 100%; height: $sp-1;
  background: $color;
  transform-origin: left; // 규칙8: 진행바 왼쪽 끝 고정
  transform: scaleX(1);
}

// 실제 사용: 진행바의 animationend 가 곧 닫힘 신호다. bar.addEventListener('animationend', () => toast.remove())
// 데모는 이 사이클(진행바가 다 닳고 → 토스트가 사라짐)을 전역 루프(2s) 안에 압축해 반복한다
.toast.is-demo .toast__bar { animation: bar-shrink $dur-loop $easing infinite; }
.toast.is-demo { animation: toast-out $dur-loop $ease-out infinite; }

@keyframes bar-shrink {
  0%   { transform: scaleX(1); }
  82%  { transform: scaleX(0); }
  100% { transform: scaleX(0); }
}
@keyframes toast-out {
  0%, 82% { opacity: 1; transform: translateY(0); }
  100%    { opacity: 0; transform: translateY(-8px); }
}

// ── 접근성: 움직임 줄이기 설정이면 진행바만 조용히 줄고 토스트는 안 흔들린다 ────────
@media (prefers-reduced-motion: reduce) {
  .toast.is-demo { animation: none; }
  .toast.is-demo .toast__bar { animation: bar-shrink $duration linear forwards; }
}

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);
}

.toast {
  position: relative;
  overflow: hidden;
  width: min(280px, 84vw);
  padding: 16px;
  border-radius: 16px;
  background: #17141a;
  color: #fff7e6;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.toast__title {
  margin: 0 0 4px;
  font-weight: 700;
  font-size: 15px;
  line-height: 1.3;
  font-family: inherit;
}

.toast__text {
  margin: 0;
  font-weight: 400;
  font-size: 13px;
  line-height: 1.4;
  font-family: inherit;
  opacity: 0.78;
}

.toast__bar {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 4px;
  background: #2f6df6;
  transform-origin: left;
  transform: scaleX(1);
}

.toast.is-demo .toast__bar {
  animation: bar-shrink 2s linear infinite;
}

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

@keyframes bar-shrink {
  0% {
    transform: scaleX(1);
  }
  82% {
    transform: scaleX(0);
  }
  100% {
    transform: scaleX(0);
  }
}
@keyframes toast-out {
  0%, 82% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(-8px);
  }
}
@media (prefers-reduced-motion: reduce) {
  .toast.is-demo {
    animation: none;
  }
  .toast.is-demo .toast__bar {
    animation: bar-shrink 5000ms linear forwards;
  }
}

import { useEffect, useRef } from "react";
import type { CSSProperties } from "react";
import styles from "./ProgressCloseToast.module.scss";

export type ProgressCloseToastProps = {
  title: string;
  message: string;
  onDismiss?: () => void;
  /** 진행바가 다 닳기까지 실제 시간 (기본 5000ms) */
  duration?: number;
  color?: string;
};

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

export default function ProgressCloseToast({
  title,
  message,
  onDismiss,
  duration = 5000,
  color = "#2f6df6",
}: ProgressCloseToastProps) {
  const barRef = useRef<HTMLSpanElement | null>(null);

  useEffect(() => {
    const bar = barRef.current;
    if (!bar || !onDismiss) return;
    const onEnd = () => onDismiss();
    bar.addEventListener("animationend", onEnd);
    return () => bar.removeEventListener("animationend", onEnd);
  }, [onDismiss]);

  const vars: Vars = { "--duration": `${duration}ms`, "--color": color };

  return (
    <div className={styles.toast} style={vars} role="status" aria-live="polite">
      <div className={styles.body}>
        <p className={styles.title}>{title}</p>
        <p className={styles.text}>{message}</p>
      </div>
      <span ref={barRef} className={styles.bar} aria-hidden="true" />
    </div>
  );
}