01밀려 올라가는 스택

<main class="stage">
  <div class="pu is-demo">
    <div class="pu__stack">
      <div class="pu__list" id="pu-list" role="region" aria-label="알림 스택" aria-live="polite">
        <article class="pu__item">
          <span class="pu__ic" aria-hidden="true"><svg viewBox="0 0 256 256" width="18" height="18"><g fill="currentColor"><path d="M224 128a96 96 0 1 1-96-96a96 96 0 0 1 96 96" opacity=".2"/><path d="M173.66 98.34a8 8 0 0 1 0 11.32l-56 56a8 8 0 0 1-11.32 0l-24-24a8 8 0 0 1 11.32-11.32L112 148.69l50.34-50.35a8 8 0 0 1 11.32 0M232 128A104 104 0 1 1 128 24a104.11 104.11 0 0 1 104 104m-16 0a88 88 0 1 0-88 88a88.1 88.1 0 0 0 88-88"/></g></svg></span>
          <span class="pu__msg">파일을 저장했습니다</span>
        </article>
        <article class="pu__item">
          <span class="pu__ic" aria-hidden="true"><svg viewBox="0 0 256 256" width="18" height="18"><g fill="currentColor"><path d="M208 192H48a8 8 0 0 1-6.88-12C47.71 168.6 56 139.81 56 104a72 72 0 0 1 144 0c0 35.82 8.3 64.6 14.9 76a8 8 0 0 1-6.9 12" opacity=".2"/><path d="M221.8 175.94c-5.55-9.56-13.8-36.61-13.8-71.94a80 80 0 1 0-160 0c0 35.34-8.26 62.38-13.81 71.94A16 16 0 0 0 48 200h40.81a40 40 0 0 0 78.38 0H208a16 16 0 0 0 13.8-24.06M128 216a24 24 0 0 1-22.62-16h45.24A24 24 0 0 1 128 216m-80-32c7.7-13.24 16-43.92 16-80a64 64 0 1 1 128 0c0 36.05 8.28 66.73 16 80Z"/></g></svg></span>
          <span class="pu__msg">댓글이 하나 달렸습니다</span>
        </article>
        <article class="pu__item">
          <span class="pu__ic" aria-hidden="true"><svg viewBox="0 0 256 256" width="18" height="18"><g fill="currentColor"><path d="M240 128a80 80 0 0 1-80 80H72A56 56 0 1 1 85.92 97.74v.1A80 80 0 0 1 240 128" opacity=".2"/><path d="M178.34 165.66L160 147.31V208a8 8 0 0 1-16 0v-60.69l-18.34 18.35a8 8 0 0 1-11.32-11.32l32-32a8 8 0 0 1 11.32 0l32 32a8 8 0 0 1-11.32 11.32M160 40a88.08 88.08 0 0 0-78.71 48.68A64 64 0 1 0 72 216h40a8 8 0 0 0 0-16H72a48 48 0 0 1 0-96c1.1 0 2.2 0 3.29.12A88 88 0 0 0 72 128a8 8 0 0 0 16 0a72 72 0 1 1 100.8 66a8 8 0 0 0 3.2 15.34a7.9 7.9 0 0 0 3.2-.68A88 88 0 0 0 160 40"/></g></svg></span>
          <span class="pu__msg">업로드가 끝났습니다</span>
        </article>
      </div>
    </div>
    <button class="pu__go" type="button" id="pu-go">알림 하나 더 보내기</button>
  </div>
</main>

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

$duration: $dur-base;
$easing: $ease-spring;
$color: $subject-blue;

@include stage($stage-ink);

.pu {
  box-sizing: border-box;
  width: min(408px, 88vw);
  display: flex;
  flex-direction: column;
  gap: $sp-2;
  --slot: 44px;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: $subject-cream;
}

// 스택 상자 — 카드가 아래에서 들어오므로 넘치는 부분은 여기서 잘린다
.pu__stack {
  position: relative;
  overflow: hidden;
  height: 140px;
  border-radius: $r-card;
  background: rgba(255, 255, 255, .05);
}
.pu__list {
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: 8px;
  display: flex;
  flex-direction: column-reverse;
  justify-content: flex-start;
  gap: $sp-2;
}

.pu__item {
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: $sp-2;
  margin: 0;
  padding: $sp-2 $sp-3;
  border-radius: $r-control;
  background: $subject-cream;
  color: $subject-ink;
  box-shadow: $shadow-press;
  transition: transform $duration $easing;
}
.pu__ic {
  display: inline-flex;
  flex: 0 0 auto;
  color: $color;
}
.pu__ic svg { display: block; }
.pu__msg {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 12px;
  line-height: 18px;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pu__go {
  box-sizing: border-box;
  margin: 0;
  padding: $sp-2 $sp-4;
  border: 0;
  border-radius: $r-pill;
  background: $subject-blue-deep;
  color: $subject-cream;
  font-family: inherit;
  font-size: 12px;
  line-height: 18px;
  font-weight: 700;
  cursor: pointer;
}
.pu__go:focus-visible { outline: 2px solid $subject-cream; outline-offset: 2px; }

// 사람이 누른 뒤: 새 카드만 아래에서 솟고, 밀려나는 카드는 위 transition 이 옮긴다
.pu__item.is-in {
  animation-name: pu-in;
  animation-duration: $duration;
  animation-timing-function: $easing;
  animation-iteration-count: 1;
}
@keyframes pu-in {
  0%   { opacity: 0; transform: translateY(40px); }
  100% { opacity: 1; transform: translateY(0); }
}

// ── 자동 루프: 세 장이 차례로 들어오며 앞 카드를 한 칸씩 위로 민다. 90% 안에서 전부 빠진다 ──
.pu.is-demo .pu__item {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  transition: none;
  animation-duration: $dur-loop;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
}
.pu.is-demo .pu__item:nth-child(1) { animation-name: pu-a; }
.pu.is-demo .pu__item:nth-child(2) { animation-name: pu-b; }
.pu.is-demo .pu__item:nth-child(3) { animation-name: pu-c; }

// 퇴장은 샘플 프레임 사이(4.1667% 간격)에서 한 장씩 끊어 없앤다 — 셋이 한꺼번에 사라지면 그 빈 화면이 poster 로 뽑힌다
@keyframes pu-a {
  0%, 4%    { opacity: 0; transform: translateY(48px); }
  12%       { opacity: 1; transform: translateY(0); }
  34%       { opacity: 1; transform: translateY(0); }
  42%       { opacity: 1; transform: translateY(calc(var(--slot) * -1)); }
  62%       { opacity: 1; transform: translateY(calc(var(--slot) * -1)); }
  70%       { opacity: 1; transform: translateY(calc(var(--slot) * -2)); }
  76%       { opacity: 1; transform: translateY(calc(var(--slot) * -2)); }
  78%       { opacity: 0; transform: translateY(calc(var(--slot) * -2)); }
  90%, 100% { opacity: 0; transform: translateY(48px); }
}
@keyframes pu-b {
  0%, 30%   { opacity: 0; transform: translateY(48px); }
  40%       { opacity: 1; transform: translateY(0); }
  62%       { opacity: 1; transform: translateY(0); }
  70%       { opacity: 1; transform: translateY(calc(var(--slot) * -1)); }
  80%       { opacity: 1; transform: translateY(calc(var(--slot) * -1)); }
  82%       { opacity: 0; transform: translateY(calc(var(--slot) * -1)); }
  90%, 100% { opacity: 0; transform: translateY(48px); }
}
@keyframes pu-c {
  0%, 58%   { opacity: 0; transform: translateY(48px); }
  68%       { opacity: 1; transform: translateY(0); }
  84%       { opacity: 1; transform: translateY(0); }
  86%       { opacity: 0; transform: translateY(0); }
  90%, 100% { opacity: 0; transform: translateY(48px); }
}

@media (max-width: 340px) {
  .pu { --slot: 34px; }
  .pu__stack { height: 104px; }
  .pu__item { padding: $sp-1 $sp-2; }
  .pu__msg { font-size: 11px; line-height: 16px; }
  .pu__go { padding: $sp-1 $sp-3; font-size: 11px; line-height: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .pu.is-demo .pu__item,
  .pu__item.is-in { animation: none !important; opacity: 1; }
  .pu.is-demo .pu__item:nth-child(1) { transform: translateY(calc(var(--slot) * -2)); }
  .pu.is-demo .pu__item:nth-child(2) { transform: translateY(calc(var(--slot) * -1)); }
  .pu.is-demo .pu__item:nth-child(3) { transform: translateY(0); }
  .pu__item { transition: none; }
}

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);
}

.pu {
  box-sizing: border-box;
  width: min(408px, 88vw);
  display: flex;
  flex-direction: column;
  gap: 8px;
  --slot: 44px;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: #fff7e6;
}

.pu__stack {
  position: relative;
  overflow: hidden;
  height: 140px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.05);
}

.pu__list {
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: 8px;
  display: flex;
  flex-direction: column-reverse;
  justify-content: flex-start;
  gap: 8px;
}

.pu__item {
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 8px 12px;
  border-radius: 12px;
  background: #fff7e6;
  color: #17141a;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  transition: transform 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.pu__ic {
  display: inline-flex;
  flex: 0 0 auto;
  color: #2f6df6;
}

.pu__ic svg {
  display: block;
}

.pu__msg {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 12px;
  line-height: 18px;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pu__go {
  box-sizing: border-box;
  margin: 0;
  padding: 8px 16px;
  border: 0;
  border-radius: 999px;
  background: #0a4fe8;
  color: #fff7e6;
  font-family: inherit;
  font-size: 12px;
  line-height: 18px;
  font-weight: 700;
  cursor: pointer;
}

.pu__go:focus-visible {
  outline: 2px solid #fff7e6;
  outline-offset: 2px;
}

.pu__item.is-in {
  animation-name: pu-in;
  animation-duration: 300ms;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: 1;
}

@keyframes pu-in {
  0% {
    opacity: 0;
    transform: translateY(40px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}
.pu.is-demo .pu__item {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  transition: none;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}

.pu.is-demo .pu__item:nth-child(1) {
  animation-name: pu-a;
}

.pu.is-demo .pu__item:nth-child(2) {
  animation-name: pu-b;
}

.pu.is-demo .pu__item:nth-child(3) {
  animation-name: pu-c;
}

@keyframes pu-a {
  0%, 4% {
    opacity: 0;
    transform: translateY(48px);
  }
  12% {
    opacity: 1;
    transform: translateY(0);
  }
  34% {
    opacity: 1;
    transform: translateY(0);
  }
  42% {
    opacity: 1;
    transform: translateY(calc(var(--slot) * -1));
  }
  62% {
    opacity: 1;
    transform: translateY(calc(var(--slot) * -1));
  }
  70% {
    opacity: 1;
    transform: translateY(calc(var(--slot) * -2));
  }
  76% {
    opacity: 1;
    transform: translateY(calc(var(--slot) * -2));
  }
  78% {
    opacity: 0;
    transform: translateY(calc(var(--slot) * -2));
  }
  90%, 100% {
    opacity: 0;
    transform: translateY(48px);
  }
}
@keyframes pu-b {
  0%, 30% {
    opacity: 0;
    transform: translateY(48px);
  }
  40% {
    opacity: 1;
    transform: translateY(0);
  }
  62% {
    opacity: 1;
    transform: translateY(0);
  }
  70% {
    opacity: 1;
    transform: translateY(calc(var(--slot) * -1));
  }
  80% {
    opacity: 1;
    transform: translateY(calc(var(--slot) * -1));
  }
  82% {
    opacity: 0;
    transform: translateY(calc(var(--slot) * -1));
  }
  90%, 100% {
    opacity: 0;
    transform: translateY(48px);
  }
}
@keyframes pu-c {
  0%, 58% {
    opacity: 0;
    transform: translateY(48px);
  }
  68% {
    opacity: 1;
    transform: translateY(0);
  }
  84% {
    opacity: 1;
    transform: translateY(0);
  }
  86% {
    opacity: 0;
    transform: translateY(0);
  }
  90%, 100% {
    opacity: 0;
    transform: translateY(48px);
  }
}
@media (max-width: 340px) {
  .pu {
    --slot: 34px;
  }
  .pu__stack {
    height: 104px;
  }
  .pu__item {
    padding: 4px 8px;
  }
  .pu__msg {
    font-size: 11px;
    line-height: 16px;
  }
  .pu__go {
    padding: 4px 12px;
    font-size: 11px;
    line-height: 16px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .pu.is-demo .pu__item,
  .pu__item.is-in {
    animation: none !important;
    opacity: 1;
  }
  .pu.is-demo .pu__item:nth-child(1) {
    transform: translateY(calc(var(--slot) * -2));
  }
  .pu.is-demo .pu__item:nth-child(2) {
    transform: translateY(calc(var(--slot) * -1));
  }
  .pu.is-demo .pu__item:nth-child(3) {
    transform: translateY(0);
  }
  .pu__item {
    transition: none;
  }
}

// 실제 동작: 새 카드를 맨 아래에 넣고, 위로 밀려나는 카드들을 FLIP 으로 제자리에 붙였다 놓는다
var root = document.querySelector('.pu');
var list = document.getElementById('pu-list');
var go = document.getElementById('pu-go');
var seeds = [].slice.call(list.children); // 원본 카드 세 장을 틀로 쓴다
var turn = 0;
function push() {
  if (root.classList.contains('is-demo')) { root.classList.remove('is-demo'); list.innerHTML = ''; }
  var before = [].map.call(list.children, function (el) { return el.getBoundingClientRect().top; });
  var el = seeds[turn++ % seeds.length].cloneNode(true);
  el.className = 'pu__item is-in';
  list.insertBefore(el, list.firstChild);
  [].forEach.call(list.children, function (node, i) {
    if (!i) return;
    var d = before[i - 1] - node.getBoundingClientRect().top; // 옛 위치 − 새 위치 = 되돌릴 거리
    node.style.transition = 'none';
    node.style.transform = 'translateY(' + d + 'px)';
  });
  requestAnimationFrame(function () { // 한 프레임 뒤에 풀어야 브라우저가 되돌린 위치를 시작점으로 본다
    [].forEach.call(list.children, function (node, i) {
      if (!i) return;
      node.style.transition = '';
      node.style.transform = '';
    });
  });
  while (list.children.length > 3) list.removeChild(list.lastChild);
}
go.addEventListener('click', push);

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

export type PushUpStackProps = {
  items?: string[];
  label?: string;
  regionLabel?: string;
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
// React 이벤트 타입은 'react' 에서 import 하지 않는다 — 포트 안에서 필요한 모양만 선언한다
type ClickEvt = { preventDefault: () => void };

export default function PushUpStack({
  items = ["Saved the file", "Someone left a comment", "Upload finished"],
  label = "Send one more",
  regionLabel = "Notification stack",
  duration = 300,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: PushUpStackProps) {
  const [demo, setDemo] = useState(true);
  const [rows, setRows] = useState<{ id: number; text: string }[]>([]);
  const listRef = useRef<HTMLDivElement>(null);
  const before = useRef<number[]>([]);
  const seq = useRef<number[]>([0]);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  function push(e: ClickEvt) {
    e.preventDefault();
    const el = listRef.current;
    before.current = el ? Array.from(el.children).map((c) => (c as HTMLElement).getBoundingClientRect().top) : [];
    const n = (seq.current ?? [0])[0];
    if (seq.current) seq.current[0] = n + 1;
    setDemo(false);
    setRows((v) => [{ id: n, text: items[n % items.length] }, ...v].slice(0, 3));
  }

  // FLIP — 새 줄이 들어가 레이아웃이 바뀐 **뒤**에 옛 위치로 되돌렸다가 한 프레임 뒤에 풀어 준다
  useEffect(() => {
    const el = listRef.current;
    const old = before.current ?? [];
    if (!el || !old.length) return;
    const kids = Array.from(el.children) as HTMLElement[];
    kids.forEach((node, i) => {
      if (!i) return;
      node.style.transition = "none";
      node.style.transform = `translateY(${old[i - 1] - node.getBoundingClientRect().top}px)`;
    });
    requestAnimationFrame(() => {
      kids.forEach((node, i) => {
        if (!i) return;
        node.style.transition = "";
        node.style.transform = "";
      });
    });
    before.current = [];
  }, [rows]);

  const shown = demo ? items.slice(0, 3).map((text, i) => ({ id: -1 - i, text })) : rows;

  return (
    <div className={`${styles.pu} ${demo ? styles.isDemo : ""}`} style={vars}>
      <div className={styles.stack}>
        <div className={styles.list} ref={listRef} role="region" aria-label={regionLabel} aria-live="polite">
          {shown.map((row) => (
            <article key={row.id} className={`${styles.item} ${demo ? "" : styles.isIn}`}>
              <span className={styles.ic} aria-hidden="true">
                <svg viewBox="0 0 256 256" width="18" height="18"><g fill="currentColor"><path d="M224 128a96 96 0 1 1-96-96a96 96 0 0 1 96 96" opacity=".2" /><path d="M173.66 98.34a8 8 0 0 1 0 11.32l-56 56a8 8 0 0 1-11.32 0l-24-24a8 8 0 0 1 11.32-11.32L112 148.69l50.34-50.35a8 8 0 0 1 11.32 0M232 128A104 104 0 1 1 128 24a104.11 104.11 0 0 1 104 104m-16 0a88 88 0 1 0-88 88a88.1 88.1 0 0 0 88-88" /></g></svg>
              </span>
              <span className={styles.msg}>{row.text}</span>
            </article>
          ))}
        </div>
      </div>
      <button className={styles.go} type="button" onClick={push}>{label}</button>
    </div>
  );
}