08Nested depth slide — the whole menu shifts sideways by a distance tied to the entered depth value

<main class="stage">
<div class="cm is-demo" id="cm">
  <div class="cm__field" id="cmField">
    <span class="cm__hint">Right-click → Share → More</span>
  </div>
  <div class="cm__menu" id="cmMenu" role="menu">
    <div class="cm__track" id="cmTrack">
      <div class="cm__panel" data-depth="0">
        <button class="cm__item" type="button" role="menuitem"><span class="cm__ic"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256"><g fill="currentColor"><path d="M216 40v128h-48V88H88V40Z" opacity=".2"/><path d="M216 32H88a8 8 0 0 0-8 8v40H40a8 8 0 0 0-8 8v128a8 8 0 0 0 8 8h128a8 8 0 0 0 8-8v-40h40a8 8 0 0 0 8-8V40a8 8 0 0 0-8-8m-56 176H48V96h112Zm48-48h-32V88a8 8 0 0 0-8-8H96V48h112Z"/></g></svg></span><span>Copy</span></button>
        <button class="cm__item" type="button" role="menuitem" data-open="1"><span class="cm__ic"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256"><g fill="currentColor"><path d="M225.32 68.12L157.62 28a15.93 15.93 0 0 0-16.17.09l-67.7 40.72A16 16 0 0 0 66 82.55v78.06L30.68 181.79A16 16 0 0 0 30.6 209l67.7 40.72a15.93 15.93 0 0 0 16.17.08l67.7-40.72A16 16 0 0 0 190 195.36v-77.9l35.4-21.29a16 16 0 0 0 .08-27.19Z" opacity=".2"/><path d="M232.94 65a24 24 0 0 0-11.36-14.5L153.87 10.4a24 24 0 0 0-24.28.13L61.9 51.25A23.86 23.86 0 0 0 50 72.61v75.19l-9.94 6a24 24 0 0 0-2.62 39.29a1.4 1.4 0 0 0 .16.13l67.71 40.7a24 24 0 0 0 24.28-.13l67.7-40.72A23.85 23.85 0 0 0 209 174.6V99.34Z" opacity="0"/><path d="M136 128a8 8 0 0 1-8 8h-8v8a8 8 0 0 1-16 0v-8h-8a8 8 0 0 1 0-16h8v-8a8 8 0 0 1 16 0v8h8a8 8 0 0 1 8 8m84.72-49.14L128 24 35.28 78.86A8 8 0 0 0 32 85.42V170.6a8 8 0 0 0 3.28 6.46L128 232l92.72-54.94a8 8 0 0 0 3.28-6.46V85.42a8 8 0 0 0-3.28-6.56"/></g></svg></span><span>Share</span><span class="cm__caret"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256"><path fill="currentColor" d="M181.66 133.66l-80 80a8 8 0 0 1-11.32-11.32L164.69 128L90.34 53.66a8 8 0 0 1 11.32-11.32l80 80a8 8 0 0 1 0 11.32"/></svg></span></button>
        <button class="cm__item" type="button" role="menuitem" data-open="2"><span class="cm__ic"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256"><g fill="currentColor"><circle cx="128" cy="64" r="16" opacity=".2"/><circle cx="128" cy="192" r="16" opacity=".2"/><path d="M128 48a16 16 0 1 0 16 16a16 16 0 0 0-16-16m0 112a16 16 0 1 0 16 16a16 16 0 0 0-16-16m0-56a16 16 0 1 0 16 16a16 16 0 0 0-16-16"/></g></svg></span><span>More</span><span class="cm__caret"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256"><path fill="currentColor" d="M181.66 133.66l-80 80a8 8 0 0 1-11.32-11.32L164.69 128L90.34 53.66a8 8 0 0 1 11.32-11.32l80 80a8 8 0 0 1 0 11.32"/></svg></span></button>
      </div>
      <div class="cm__panel" data-depth="1">
        <button class="cm__item cm__item--back" type="button" data-back="1">‹ Share</button>
        <button class="cm__item" type="button" role="menuitem"><span>Messenger</span></button>
        <button class="cm__item" type="button" role="menuitem"><span>Copy link</span></button>
      </div>
      <div class="cm__panel" data-depth="2">
        <button class="cm__item cm__item--back" type="button" data-back="1">‹ More</button>
        <button class="cm__item cm__item--danger" type="button" role="menuitem"><span>Delete</span></button>
        <button class="cm__item" type="button" role="menuitem"><span>Properties</span></button>
      </div>
    </div>
  </div>
</div>
</main>

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

// 계산 겹: 현재 드릴다운 깊이(depth) 에 패널 폭(PANEL_W)을 곱한 값만큼 트랙 전체를 옆으로
// translateX 시켜, 깊이가 늘 때마다 다음 패널이 같은 폭만큼 밀려 들어오게 만든다.
@include stage($stage-yellow);

.cm {
  position: relative;
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
}

.cm__field {
  width: clamp(190px, 60vw, 260px);
  height: 130px;
  border-radius: $r-card;
  background: $subject-ink;
  color: $subject-cream;
  display: grid;
  place-items: center;
  padding: $sp-3;
  box-sizing: border-box;
  font: 600 14px/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  text-align: center;
  user-select: none;
}

.cm__hint { opacity: .8; font-weight: 500; font-size: 12px; }

.cm__menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 168px;
  background: $stage-paper;
  border-radius: $r-sm;
  box-shadow: $shadow-raised;
  opacity: 0;
  pointer-events: none;
  overflow: hidden;
  transition: opacity $dur-quick $ease-out;
  z-index: 5;

  &.is-open { opacity: 1; pointer-events: auto; }
}

.cm__track {
  display: flex;
  width: 100%;
  transition: transform $dur-base $ease-pop;
}

.cm__panel {
  flex: none;
  width: 168px;
  box-sizing: border-box;
  padding: $sp-1;
  display: grid;
  gap: $sp-1;
  align-content: start;
}

.cm__item {
  display: flex;
  align-items: center;
  gap: $sp-2;
  padding: $sp-2 $sp-3;
  border: 0;
  background: none;
  border-radius: $r-xs;
  font: 500 13px/1.2 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: $subject-ink;
  cursor: pointer;
  text-align: left;
  width: 100%;

  &:hover, &:focus-visible { background: rgba($subject-ink, .08); }
  &--back { color: rgba($subject-ink, .6); font-weight: 600; }
}

.cm__caret { margin-left: auto; width: 12px; height: 12px; color: rgba($subject-ink, .55); }
.cm__caret svg { display: block; width: 100%; height: 100%; }

.cm__ic {
  width: 16px;
  height: 16px;
  flex: none;
  color: $subject-blue;

  svg { display: block; width: 100%; height: 100%; }
}

@media (max-width: 340px) {
  .cm__field { width: 176px; height: 108px; font-size: 12px; padding: $sp-2; }
  .cm__menu, .cm__panel { width: 144px; }
  .cm__item { padding: $sp-1 $sp-2; font-size: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  .cm__menu, .cm__track { transition: none; }
}

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);
}

.cm {
  position: relative;
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
}

.cm__field {
  width: clamp(190px, 60vw, 260px);
  height: 130px;
  border-radius: 16px;
  background: #17141a;
  color: #fff7e6;
  display: grid;
  place-items: center;
  padding: 12px;
  box-sizing: border-box;
  font: 600 14px/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  text-align: center;
  user-select: none;
}

.cm__hint {
  opacity: 0.8;
  font-weight: 500;
  font-size: 12px;
}

.cm__menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 168px;
  background: #ffffff;
  border-radius: 8px;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  opacity: 0;
  pointer-events: none;
  overflow: hidden;
  transition: opacity 220ms ease-out;
  z-index: 5;
}
.cm__menu.is-open {
  opacity: 1;
  pointer-events: auto;
}

.cm__track {
  display: flex;
  width: 100%;
  transition: transform 300ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.cm__panel {
  flex: none;
  width: 168px;
  box-sizing: border-box;
  padding: 4px;
  display: grid;
  gap: 4px;
  align-content: start;
}

.cm__item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 0;
  background: none;
  border-radius: 4px;
  font: 500 13px/1.2 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: #17141a;
  cursor: pointer;
  text-align: left;
  width: 100%;
}
.cm__item:hover, .cm__item:focus-visible {
  background: rgba(23, 20, 26, 0.08);
}
.cm__item--back {
  color: rgba(23, 20, 26, 0.6);
  font-weight: 600;
}

.cm__caret {
  margin-left: auto;
  width: 12px;
  height: 12px;
  color: rgba(23, 20, 26, 0.55);
}

.cm__caret svg {
  display: block;
  width: 100%;
  height: 100%;
}

.cm__ic {
  width: 16px;
  height: 16px;
  flex: none;
  color: #2f6df6;
}
.cm__ic svg {
  display: block;
  width: 100%;
  height: 100%;
}

@media (max-width: 340px) {
  .cm__field {
    width: 176px;
    height: 108px;
    font-size: 12px;
    padding: 8px;
  }
  .cm__menu, .cm__panel {
    width: 144px;
  }
  .cm__item {
    padding: 4px 8px;
    font-size: 12px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cm__menu, .cm__track {
    transition: none;
  }
}

(function () {
  var field = document.getElementById('cmField');
  var menu = document.getElementById('cmMenu');
  var track = document.getElementById('cmTrack');
  var root = document.getElementById('cm');
  var GAP = 6, PANEL_W = 168, depth = 0;

  function positionAt(x, y) {
    var mw = menu.offsetWidth;
    var vw = document.documentElement.clientWidth, vh = document.documentElement.clientHeight;
    var mh = menu.offsetHeight || 160;
    var px = Math.max(GAP, Math.min(x, vw - mw - GAP));
    var py = Math.max(GAP, Math.min(y, vh - mh - GAP));
    menu.style.left = px.toFixed(0) + 'px';
    menu.style.top = py.toFixed(0) + 'px';
  }

  // 계산 겹: 깊이(depth) 값에 패널 폭(PANEL_W)을 곱해 트랙을 옆으로 밀어, 깊이가 1 늘 때마다
  // 정확히 패널 하나만큼 다음 화면이 이어 들어오게 한다.
  function goTo(d) {
    depth = d;
    track.style.transform = 'translateX(' + (-depth * PANEL_W) + 'px)';
  }

  function open(x, y) { positionAt(x, y); goTo(0); menu.classList.add('is-open'); }
  function close() { menu.classList.remove('is-open'); goTo(0); }

  menu.addEventListener('click', function (e) {
    var openBtn = e.target.closest('[data-open]');
    var backBtn = e.target.closest('[data-back]');
    if (openBtn) goTo(parseInt(openBtn.getAttribute('data-open'), 10));
    else if (backBtn) goTo(0);
  });

  field.addEventListener('contextmenu', function (e) {
    e.preventDefault();
    root.classList.remove('is-demo'); stopAutoplay();
    open(e.clientX, e.clientY);
  });
  document.addEventListener('pointerdown', function (e) {
    if (menu.classList.contains('is-open') && !menu.contains(e.target) && e.target !== field) close();
  });

  // 자동 루프: 메뉴를 연 뒤 depth 0 → 1(Share) → 0 → 2(More) 순으로 이동해 트랙이 패널 폭만큼
  // 밀렸다가 되돌아오는 것을 보여준다.
  var seq = [0, 1, 0, 2, 0];
  var si = 0, autoTimer = null, opened = false;
  function autoTick() {
    if (!opened) { var r = field.getBoundingClientRect(); open(r.left + 16, r.top + 16); opened = true; return; }
    goTo(seq[si % seq.length]);
    si++;
    if (si > seq.length + 1) { close(); opened = false; si = 0; }
  }
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  function stopAutoplay() { if (autoTimer) { clearInterval(autoTimer); autoTimer = null; } }
  if (!reduce) { autoTimer = setInterval(autoTick, 340); autoTick(); }
})();

import { useEffect, useRef } from "react";
import styles from "./NestedDepthSlide.module.scss";

const ICON_COPY = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256"><g fill="currentColor"><path d="M216 40v128h-48V88H88V40Z" opacity=".2"/><path d="M216 32H88a8 8 0 0 0-8 8v40H40a8 8 0 0 0-8 8v128a8 8 0 0 0 8 8h128a8 8 0 0 0 8-8v-40h40a8 8 0 0 0 8-8V40a8 8 0 0 0-8-8m-56 176H48V96h112Zm48-48h-32V88a8 8 0 0 0-8-8H96V48h112Z"/></g></svg>';
const ICON_SHARE = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256"><g fill="currentColor"><path d="M225.32 68.12L157.62 28a15.93 15.93 0 0 0-16.17.09l-67.7 40.72A16 16 0 0 0 66 82.55v78.06L30.68 181.79A16 16 0 0 0 30.6 209l67.7 40.72a15.93 15.93 0 0 0 16.17.08l67.7-40.72A16 16 0 0 0 190 195.36v-77.9l35.4-21.29a16 16 0 0 0 .08-27.19Z" opacity=".2"/><path d="M232.94 65a24 24 0 0 0-11.36-14.5L153.87 10.4a24 24 0 0 0-24.28.13L61.9 51.25A23.86 23.86 0 0 0 50 72.61v75.19l-9.94 6a24 24 0 0 0-2.62 39.29a1.4 1.4 0 0 0 .16.13l67.71 40.7a24 24 0 0 0 24.28-.13l67.7-40.72A23.85 23.85 0 0 0 209 174.6V99.34Z" opacity="0"/><path d="M136 128a8 8 0 0 1-8 8h-8v8a8 8 0 0 1-16 0v-8h-8a8 8 0 0 1 0-16h8v-8a8 8 0 0 1 16 0v8h8a8 8 0 0 1 8 8m84.72-49.14L128 24 35.28 78.86A8 8 0 0 0 32 85.42V170.6a8 8 0 0 0 3.28 6.46L128 232l92.72-54.94a8 8 0 0 0 3.28-6.46V85.42a8 8 0 0 0-3.28-6.56"/></g></svg>';
const ICON_MORE = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256"><g fill="currentColor"><circle cx="128" cy="64" r="16" opacity=".2"/><circle cx="128" cy="192" r="16" opacity=".2"/><path d="M128 48a16 16 0 1 0 16 16a16 16 0 0 0-16-16m0 112a16 16 0 1 0 16 16a16 16 0 0 0-16-16m0-56a16 16 0 1 0 16 16a16 16 0 0 0-16-16"/></g></svg>';
const ICON_CARET = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256"><path fill="currentColor" d="M181.66 133.66l-80 80a8 8 0 0 1-11.32-11.32L164.69 128L90.34 53.66a8 8 0 0 1 11.32-11.32l80 80a8 8 0 0 1 0 11.32"/></svg>';

export type NestedDepthSlideProps = {
  color?: string;
};

export default function NestedDepthSlide({
  color = "#2f6df6",
}: NestedDepthSlideProps) {
  const rootRef = useRef<HTMLDivElement | null>(null);

  useEffect(() => {
    const root = rootRef.current;
    if (!root) return;
    const field = root.querySelector<HTMLDivElement>(`.${styles.field}`);
    const menu = root.querySelector<HTMLDivElement>(`.${styles.menu}`);
    const track = root.querySelector<HTMLDivElement>(`.${styles.track}`);
    if (!field || !menu || !track) return;
    const GAP = 6, PANEL_W = 168;
    let depth = 0;

    function positionAt(x: number, y: number) {
      const mw = menu!.offsetWidth;
      const vw = document.documentElement.clientWidth, vh = document.documentElement.clientHeight;
      const mh = menu!.offsetHeight || 160;
      const px = Math.max(GAP, Math.min(x, vw - mw - GAP));
      const py = Math.max(GAP, Math.min(y, vh - mh - GAP));
      menu!.style.left = px.toFixed(0) + "px";
      menu!.style.top = py.toFixed(0) + "px";
    }

    // 계산 겹: 깊이(depth) 값에 패널 폭(PANEL_W)을 곱해 트랙을 옆으로 밀어, 깊이가 1 늘 때마다
    // 정확히 패널 하나만큼 다음 화면이 이어 들어오게 한다.
    function goTo(d: number) {
      depth = d;
      track!.style.transform = "translateX(" + -depth * PANEL_W + "px)";
    }

    function open(x: number, y: number) { positionAt(x, y); goTo(0); menu!.classList.add(styles.open); }
    function close() { menu!.classList.remove(styles.open); goTo(0); }

    function onTrackClick(e: MouseEvent) {
      const target = e.target as HTMLElement;
      const openBtn = target.closest("[data-open]") as HTMLElement | null;
      const backBtn = target.closest("[data-back]") as HTMLElement | null;
      if (openBtn) goTo(parseInt(openBtn.getAttribute("data-open") || "0", 10));
      else if (backBtn) goTo(0);
    }
    function onContextMenu(e: MouseEvent) { e.preventDefault(); stopAutoplay(); open(e.clientX, e.clientY); }
    function onDocDown(e: PointerEvent) {
      if (menu!.classList.contains(styles.open) && !menu!.contains(e.target as Node) && e.target !== field) close();
    }
    track.addEventListener("click", onTrackClick);
    field.addEventListener("contextmenu", onContextMenu);
    document.addEventListener("pointerdown", onDocDown);

    // 자동 루프: 메뉴를 연 뒤 depth 0 → 1(공유) → 0 → 2(더보기) 순으로 이동해 트랙이 패널 폭만큼
    // 밀렸다가 되돌아오는 것을 보여준다.
    const seq = [0, 1, 0, 2, 0];
    let si = 0, autoTimer: number | null = null, opened = false;
    function autoTick() {
      if (!opened) { const r = field!.getBoundingClientRect(); open(r.left + 16, r.top + 16); opened = true; return; }
      goTo(seq[si % seq.length]);
      si++;
      if (si > seq.length + 1) { close(); opened = false; si = 0; }
    }
    function stopAutoplay() { if (autoTimer !== null) { window.clearInterval(autoTimer); autoTimer = null; } }
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    if (!reduce) { autoTimer = window.setInterval(autoTick, 340); autoTick(); }

    return () => {
      stopAutoplay();
      track.removeEventListener("click", onTrackClick);
      field.removeEventListener("contextmenu", onContextMenu);
      document.removeEventListener("pointerdown", onDocDown);
    };
  }, []);

  return (
    <div ref={rootRef} className={styles.stage}>
      <div className={styles.cm}>
        <div className={styles.field}>
          <span className={styles.hint}>우클릭 → 공유 → 더보기</span>
        </div>
        <div className={styles.menu} role="menu">
          <div className={styles.track}>
            <div className={styles.panel} data-depth="0">
              <button type="button" className={styles.item} role="menuitem">
                <span className={styles.ic} style={{ color }} dangerouslySetInnerHTML={{ __html: ICON_COPY }} />
                <span>복사</span>
              </button>
              <button type="button" className={styles.item} role="menuitem" data-open="1">
                <span className={styles.ic} style={{ color }} dangerouslySetInnerHTML={{ __html: ICON_SHARE }} />
                <span>공유</span>
                <span className={styles.caret} dangerouslySetInnerHTML={{ __html: ICON_CARET }} />
              </button>
              <button type="button" className={styles.item} role="menuitem" data-open="2">
                <span className={styles.ic} style={{ color }} dangerouslySetInnerHTML={{ __html: ICON_MORE }} />
                <span>더보기</span>
                <span className={styles.caret} dangerouslySetInnerHTML={{ __html: ICON_CARET }} />
              </button>
            </div>
            <div className={styles.panel} data-depth="1">
              <button type="button" className={`${styles.item} ${styles.back}`} data-back="1">‹ 공유</button>
              <button type="button" className={styles.item} role="menuitem"><span>메신저</span></button>
              <button type="button" className={styles.item} role="menuitem"><span>링크 복사</span></button>
            </div>
            <div className={styles.panel} data-depth="2">
              <button type="button" className={`${styles.item} ${styles.back}`} data-back="1">‹ 더보기</button>
              <button type="button" className={styles.item} role="menuitem"><span>삭제</span></button>
              <button type="button" className={styles.item} role="menuitem"><span>속성</span></button>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}