06Swipe to dismiss

<main class="stage">
  <div class="toast is-demo" role="status" aria-live="polite">
    <p class="toast__text">New message received</p>
    <span class="toast__hint" aria-hidden="true">Swipe to dismiss</span>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────
$duration: $dur-quick;   // 220ms — 놓쳤을 때 닫히는 속도
$easing: $ease-out;
$color: $subject-ink;    // 카드 색

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

.toast {
  position: relative;
  display: flex; align-items: center; justify-content: space-between; gap: $sp-3;
  width: min(280px, 84vw);
  padding: $sp-4;
  border-radius: $r-card;
  background: $color;
  color: $subject-cream;
  box-shadow: $shadow-raised;
  touch-action: pan-y;               // 세로 스크롤은 살리고 가로만 드래그로 가져간다
  transform: translateX(var(--dx, 0px));
}
.toast__text { margin: 0; font-weight: 600; font-size: 13px; line-height: 1.4; font-family: inherit; }
.toast__hint { flex: none; font-weight: 400; font-size: 11px; line-height: 1; font-family: inherit; opacity: .55; }

.toast.is-swiped-left,
.toast.is-swiped-right {
  transition: transform $duration $easing, opacity $duration $easing;
  opacity: 0;
}
.toast.is-swiped-left  { transform: translateX(-120%); }
.toast.is-swiped-right { transform: translateX(120%); }

// 실측 2026-09-10: 손이 없는 렌더에서도 "밀려서 사라짐"이 보이게 자동 루프를 별도로 둔다
.toast.is-demo { animation: swipe-loop $dur-loop $easing infinite; }

@keyframes swipe-loop {
  0%   { transform: translateX(0); opacity: 0; }
  10%  { transform: translateX(0); opacity: 1; }
  55%  { transform: translateX(0); opacity: 1; }
  85%  { transform: translateX(120%); opacity: 0; }
  86%  { transform: translateX(0); opacity: 0; }
  100% { transform: translateX(0); opacity: 0; }
}

// ── 접근성: 움직임 줄이기 설정이면 드래그 반응만 남기고 자동 루프는 끈다 ────────
@media (prefers-reduced-motion: reduce) {
  .toast.is-demo { animation: none; opacity: 1; transform: translateX(0); }
  .toast.is-swiped-left, .toast.is-swiped-right { transition: opacity $duration linear; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.toast {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: min(280px, 84vw);
  padding: 16px;
  border-radius: 16px;
  background: #17141a;
  color: #fff7e6;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  touch-action: pan-y;
  transform: translateX(var(--dx, 0px));
}

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

.toast__hint {
  flex: none;
  font-weight: 400;
  font-size: 11px;
  line-height: 1;
  font-family: inherit;
  opacity: 0.55;
}

.toast.is-swiped-left,
.toast.is-swiped-right {
  transition: transform 220ms ease-out, opacity 220ms ease-out;
  opacity: 0;
}

.toast.is-swiped-left {
  transform: translateX(-120%);
}

.toast.is-swiped-right {
  transform: translateX(120%);
}

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

@keyframes swipe-loop {
  0% {
    transform: translateX(0);
    opacity: 0;
  }
  10% {
    transform: translateX(0);
    opacity: 1;
  }
  55% {
    transform: translateX(0);
    opacity: 1;
  }
  85% {
    transform: translateX(120%);
    opacity: 0;
  }
  86% {
    transform: translateX(0);
    opacity: 0;
  }
  100% {
    transform: translateX(0);
    opacity: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .toast.is-demo {
    animation: none;
    opacity: 1;
    transform: translateX(0);
  }
  .toast.is-swiped-left, .toast.is-swiped-right {
    transition: opacity 220ms linear;
  }
}

// 실제 동작: 손가락(또는 마우스)을 뗀 순간 80px 이상 밀렸으면 그 방향으로 닫힌다. 데모 루프는 놓고 자동 재생
(function () {
  var el = document.querySelector('.toast'), x0 = 0, dx = 0, dragging = false;
  el.addEventListener('pointerdown', function (e) { x0 = e.clientX; dragging = true; el.setPointerCapture(e.pointerId); el.classList.remove('is-demo'); });
  el.addEventListener('pointermove', function (e) { if (!dragging) return; dx = e.clientX - x0; el.style.setProperty('--dx', dx + 'px'); });
  el.addEventListener('pointerup', function () {
    dragging = false;
    if (Math.abs(dx) > 80) el.classList.add(dx > 0 ? 'is-swiped-right' : 'is-swiped-left');
    else el.style.setProperty('--dx', '0px');
    dx = 0;
  });
})();

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

export type SwipeDismissToastProps = {
  message: string;
  hint?: string;
  onDismiss?: (direction: "left" | "right") => void;
  /** 이 px 이상 밀면 닫힌다 (기본 80) */
  threshold?: number;
  duration?: number;
  color?: string;
};

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

export default function SwipeDismissToast({
  message,
  hint = "밀어서 닫기",
  onDismiss,
  threshold = 80,
  duration = 220,
  color = "#17141a",
}: SwipeDismissToastProps) {
  const [dx, setDx] = useState(0);
  const [swiped, setSwiped] = useState<"left" | "right" | null>(null);
  const x0 = useRef(0);
  const dragging = useRef(false);

  const onDown = useCallback((e: PointerEvent<HTMLDivElement>) => {
    x0.current = e.clientX;
    dragging.current = true;
    e.currentTarget.setPointerCapture(e.pointerId);
  }, []);

  const onMove = useCallback((e: PointerEvent<HTMLDivElement>) => {
    if (!dragging.current) return;
    setDx(e.clientX - (x0.current ?? 0));
  }, []);

  const onUp = useCallback(() => {
    dragging.current = false;
    if (Math.abs(dx) > threshold) {
      const dir = dx > 0 ? "right" : "left";
      setSwiped(dir);
      onDismiss?.(dir);
    } else {
      setDx(0);
    }
  }, [dx, threshold, onDismiss]);

  const vars: Vars = { "--dx": `${swiped ? 0 : dx}px`, "--color": color };

  return (
    <div
      className={`${styles.toast} ${swiped ? styles[swiped === "left" ? "swipedLeft" : "swipedRight"] : ""}`}
      style={vars}
      role="status"
      aria-live="polite"
      onPointerDown={onDown}
      onPointerMove={onMove}
      onPointerUp={onUp}
    >
      <p className={styles.text}>{message}</p>
      <span className={styles.hint} aria-hidden="true">{hint}</span>
    </div>
  );
}