03Clip-path Panel a Click-position Ratio Wipes

<main class="stage">
<div class="cw is-demo" id="cw">
  <div class="cw__tabs" id="cwTabs" role="tablist" aria-label="Plan tabs">
    <button type="button" class="cw__tab is-active" role="tab" id="cw-tab-0" aria-selected="true" aria-controls="cw-panel-0" data-idx="0">Basic</button>
    <button type="button" class="cw__tab" role="tab" id="cw-tab-1" aria-selected="false" aria-controls="cw-panel-1" data-idx="1" tabindex="-1">Standard</button>
    <button type="button" class="cw__tab" role="tab" id="cw-tab-2" aria-selected="false" aria-controls="cw-panel-2" data-idx="2" tabindex="-1">Pro</button>
  </div>
  <div class="cw__wrap" id="cwWrap">
    <div class="cw__panel is-visible" id="cw-panel-0" role="tabpanel" aria-labelledby="cw-tab-0" tabindex="0">
      <span class="cw__num">9,900</span><p class="cw__line">For personal projects</p>
    </div>
    <div class="cw__panel" id="cw-panel-1" role="tabpanel" aria-labelledby="cw-tab-1" tabindex="0" hidden>
      <span class="cw__num">29,900</span><p class="cw__line">For small teams</p>
    </div>
    <div class="cw__panel" id="cw-panel-2" role="tabpanel" aria-labelledby="cw-tab-2" tabindex="0" hidden>
      <span class="cw__num">79,900</span><p class="cw__line">All features</p>
    </div>
  </div>
  <p class="cw__meta">Wipe start point <b id="cwR">0</b>%</p>
</div>
</main>

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

// 계산 겹: index.html select() 가 클릭 x 좌표를 탭바 폭 대비 비율(0~1)로 바꿔 그 지점에서
// 폭 0인 clip-path 슬릿으로 새 패널을 시작한 뒤 inset(0)으로 넓혀 그 지점부터 좌우로 닦아낸다.
@include stage($stage-orange);

.cw { width: min(100%, 300px); display: flex; flex-direction: column; gap: $sp-3; }
.cw__tabs { display: flex; gap: $sp-1; background: rgba($subject-cream, .14); padding: $sp-1; border-radius: $r-pill; }
.cw__tab {
  flex: 1 1 0; border: none; background: transparent; border-radius: $r-pill; cursor: pointer;
  padding: $sp-2 $sp-2; font-size: 11px; font-weight: 700; color: rgba($subject-cream, .78);
}
.cw__tab.is-active { background: $subject-ink; color: $subject-cream; }
.cw__tab:focus-visible { outline: 2px solid $subject-cream; outline-offset: 2px; }

.cw__wrap {
  position: relative; min-width: 0; height: 140px; border-radius: $r-card; overflow: hidden;
  background: $subject-cream;
}
.cw__panel {
  position: absolute; inset: 0; box-sizing: border-box; padding: $sp-4;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: $sp-2;
  clip-path: inset(0 0 0 0);
  transition: clip-path $dur-enter $ease-out;
}
.cw__num { font-size: 32px; font-weight: 800; color: $subject-orange-deep; }
.cw__line { margin: 0; font-size: 12px; color: rgba($subject-ink, .72); }

.cw__meta { margin: 0; font-size: 11px; color: rgba($subject-cream, .8); text-align: center; }
.cw__meta b { color: $subject-cream; font-weight: 700; }

@media (max-width: 340px) {
  .cw { width: 100%; gap: $sp-2; }
  .cw__tab { padding: $sp-1 $sp-2; }
  .cw__wrap { height: 96px; }
  .cw__num { font-size: 26px; }
}

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

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.cw {
  width: min(100%, 300px);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cw__tabs {
  display: flex;
  gap: 4px;
  background: rgba(255, 247, 230, 0.14);
  padding: 4px;
  border-radius: 999px;
}

.cw__tab {
  flex: 1 1 0;
  border: none;
  background: transparent;
  border-radius: 999px;
  cursor: pointer;
  padding: 8px 8px;
  font-size: 11px;
  font-weight: 700;
  color: rgba(255, 247, 230, 0.78);
}

.cw__tab.is-active {
  background: #17141a;
  color: #fff7e6;
}

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

.cw__wrap {
  position: relative;
  min-width: 0;
  height: 140px;
  border-radius: 16px;
  overflow: hidden;
  background: #fff7e6;
}

.cw__panel {
  position: absolute;
  inset: 0;
  box-sizing: border-box;
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  clip-path: inset(0 0 0 0);
  transition: clip-path 600ms ease-out;
}

.cw__num {
  font-size: 32px;
  font-weight: 800;
  color: #c93000;
}

.cw__line {
  margin: 0;
  font-size: 12px;
  color: rgba(23, 20, 26, 0.72);
}

.cw__meta {
  margin: 0;
  font-size: 11px;
  color: rgba(255, 247, 230, 0.8);
  text-align: center;
}

.cw__meta b {
  color: #fff7e6;
  font-weight: 700;
}

@media (max-width: 340px) {
  .cw {
    width: 100%;
    gap: 8px;
  }
  .cw__tab {
    padding: 4px 8px;
  }
  .cw__wrap {
    height: 96px;
  }
  .cw__num {
    font-size: 26px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cw__panel {
    transition: none;
  }
}

(function () {
  var HOLD_MS = 720; // 전환(css $dur-enter) 뒤 자동 순환이 머무는 시간
  var COUNT = 3;
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  var root = document.getElementById('cw');
  var tabsBar = document.getElementById('cwTabs');
  var wrap = document.getElementById('cwWrap');
  var rEl = document.getElementById('cwR');
  var tabs = [0, 1, 2].map(function (i) { return document.getElementById('cw-tab-' + i); });
  var panels = [0, 1, 2].map(function (i) { return document.getElementById('cw-panel-' + i); });

  var isDemo = true;
  var active = 0;

  function human() {
    if (isDemo) { root.classList.remove('is-demo'); isDemo = false; }
  }

  function select(idx, originX) {
    if (idx === active) return;
    var barRect = tabsBar.getBoundingClientRect();
    var x = (typeof originX === 'number') ? originX : (tabs[idx].getBoundingClientRect().left + tabs[idx].getBoundingClientRect().width / 2);
    var r = barRect.width > 0 ? Math.min(1, Math.max(0, (x - barRect.left) / barRect.width)) : 0.5; // 계산 겹: 클릭 x 좌표 → 탭바 폭 대비 비율(0~1)
    var pct = (r * 100).toFixed(1) + '%';

    tabs[active].classList.remove('is-active');
    tabs[active].setAttribute('aria-selected', 'false');
    tabs[active].setAttribute('tabindex', '-1');
    panels[active].classList.remove('is-visible');
    panels[active].setAttribute('hidden', '');

    var next = panels[idx];
    next.style.transition = 'none';
    next.style.clipPath = 'inset(0 calc(100% - ' + pct + ') 0 ' + pct + ')'; // 계산 겹: 비율 지점에서 폭 0 인 슬릿으로 시작
    next.removeAttribute('hidden');
    next.getBoundingClientRect();
    next.style.transition = '';
    requestAnimationFrame(function () {
      next.style.clipPath = 'inset(0 0 0 0)'; // 다음 프레임에 전체 노출로 전환 → transition 이 닦아내는 모양을 그린다
      next.classList.add('is-visible');
    });

    tabs[idx].classList.add('is-active');
    tabs[idx].setAttribute('aria-selected', 'true');
    tabs[idx].setAttribute('tabindex', '0');

    rEl.textContent = (r * 100).toFixed(0);
    active = idx;
  }

  tabs.forEach(function (t, i) {
    t.addEventListener('click', function () {
      human();
      var rect = t.getBoundingClientRect();
      select(i, rect.left + rect.width / 2);
    });
  });

  root.addEventListener('keydown', function (e) {
    var idx = tabs.indexOf(document.activeElement);
    if (idx === -1) return;
    var next = null;
    if (e.key === 'ArrowRight') next = (idx + 1) % COUNT;
    else if (e.key === 'ArrowLeft') next = (idx - 1 + COUNT) % COUNT;
    else if (e.key === 'Home') next = 0;
    else if (e.key === 'End') next = COUNT - 1;
    if (next === null) return;
    e.preventDefault();
    human();
    tabs[next].focus({ preventScroll: true });
    var rect = tabs[next].getBoundingClientRect();
    select(next, rect.left + rect.width / 2);
  });

  function loop() {
    if (!isDemo) return;
    var next = (active + 1) % COUNT;
    var rect = tabs[next].getBoundingClientRect();
    select(next, rect.left + rect.width / 2);
    window.setTimeout(loop, HOLD_MS);
  }

  if (!reduce) {
    window.setTimeout(loop, HOLD_MS);
  } else {
    root.classList.remove('is-demo');
  }
})();

// TabClipWipeProgress — vanilla 판(run/394/demo/03-tab-panel-clip-wipe-progress/index.html) 의 React 포트.
// select() 가 클릭 x 좌표를 탭바 폭 대비 비율(0~1)로 바꿔 그 지점에서 폭 0인 clip-path 슬릿으로
// 새 패널을 시작한 뒤 inset(0)으로 넓혀 그 지점부터 좌우로 닦아낸다.
import { useEffect, useRef } from "react";
import styles from "./TabClipWipeProgress.module.scss";

type Box<T> = { current: T };

const HOLD_MS = 720; // 전환(css $dur-enter) 뒤 자동 순환이 머무는 시간
const COUNT = 3;

export default function TabClipWipeProgress() {
  const rootRef = useRef(null) as unknown as Box<HTMLDivElement>;
  const tabsBarRef = useRef(null) as unknown as Box<HTMLDivElement>;
  const rEl = useRef(null) as unknown as Box<HTMLElement>;
  const tabRefs = useRef([null, null, null]) as unknown as Box<(HTMLButtonElement | null)[]>;
  const panelRefs = useRef([null, null, null]) as unknown as Box<(HTMLDivElement | null)[]>;
  const timerRef = useRef(0) as unknown as Box<number>;

  useEffect(() => {
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    let isDemo = true;
    let active = 0;

    function human() {
      if (isDemo) { rootRef.current?.classList.remove(styles.isDemo); isDemo = false; }
    }

    function select(idx: number, originX?: number) {
      if (idx === active) return;
      const tabsBar = tabsBarRef.current;
      const tab = tabRefs.current[idx];
      if (!tabsBar || !tab) return;
      const barRect = tabsBar.getBoundingClientRect();
      const x = typeof originX === "number" ? originX : tab.getBoundingClientRect().left + tab.getBoundingClientRect().width / 2;
      const r = barRect.width > 0 ? Math.min(1, Math.max(0, (x - barRect.left) / barRect.width)) : 0.5; // 계산 겹: 클릭 x 좌표 → 탭바 폭 대비 비율(0~1)
      const pct = (r * 100).toFixed(1) + "%";

      const prevTab = tabRefs.current[active], nextTab = tabRefs.current[idx];
      const prevPanel = panelRefs.current[active], nextPanel = panelRefs.current[idx];
      prevTab?.classList.remove(styles.isActive);
      prevTab?.setAttribute("aria-selected", "false");
      prevTab?.setAttribute("tabindex", "-1");
      prevPanel?.classList.remove(styles.isVisible);
      prevPanel?.setAttribute("hidden", "");

      if (nextPanel) {
        nextPanel.style.transition = "none";
        nextPanel.style.clipPath = "inset(0 calc(100% - " + pct + ") 0 " + pct + ")"; // 계산 겹: 비율 지점에서 폭 0 인 슬릿으로 시작
        nextPanel.removeAttribute("hidden");
        nextPanel.getBoundingClientRect();
        nextPanel.style.transition = "";
        requestAnimationFrame(() => {
          nextPanel.style.clipPath = "inset(0 0 0 0)";
          nextPanel.classList.add(styles.isVisible);
        });
      }

      nextTab?.classList.add(styles.isActive);
      nextTab?.setAttribute("aria-selected", "true");
      nextTab?.setAttribute("tabindex", "0");

      if (rEl.current) rEl.current.textContent = (r * 100).toFixed(0);
      active = idx;
    }

    function onKeydown(e: KeyboardEvent) {
      const idx = tabRefs.current.indexOf(document.activeElement as HTMLButtonElement);
      if (idx === -1) return;
      let next: number | null = null;
      if (e.key === "ArrowRight") next = (idx + 1) % COUNT;
      else if (e.key === "ArrowLeft") next = (idx - 1 + COUNT) % COUNT;
      else if (e.key === "Home") next = 0;
      else if (e.key === "End") next = COUNT - 1;
      if (next === null) return;
      e.preventDefault();
      human();
      const t = tabRefs.current[next];
      t?.focus({ preventScroll: true });
      const rect = t?.getBoundingClientRect();
      select(next, rect ? rect.left + rect.width / 2 : undefined);
    }

    function onTabClick(i: number) {
      return () => {
        human();
        const t = tabRefs.current[i];
        const rect = t?.getBoundingClientRect();
        select(i, rect ? rect.left + rect.width / 2 : undefined);
      };
    }
    const clickHandlers = [0, 1, 2].map(onTabClick);
    tabRefs.current.forEach((t, i) => t?.addEventListener("click", clickHandlers[i]));
    rootRef.current?.addEventListener("keydown", onKeydown);

    function loop() {
      if (!isDemo) return;
      const next = (active + 1) % COUNT;
      const t = tabRefs.current[next];
      const rect = t?.getBoundingClientRect();
      select(next, rect ? rect.left + rect.width / 2 : undefined);
      timerRef.current = window.setTimeout(loop, HOLD_MS);
    }

    if (!reduce) {
      timerRef.current = window.setTimeout(loop, HOLD_MS);
    } else {
      rootRef.current?.classList.remove(styles.isDemo);
    }

    return () => {
      window.clearTimeout(timerRef.current);
      tabRefs.current.forEach((t, i) => t?.removeEventListener("click", clickHandlers[i]));
      rootRef.current?.removeEventListener("keydown", onKeydown);
    };
  }, []);

  const plans = [
    { name: "베이직", price: "9,900", line: "개인 프로젝트용" },
    { name: "스탠다드", price: "29,900", line: "소규모 팀용" },
    { name: "프로", price: "79,900", line: "전체 기능" },
  ];

  return (
    <main className={styles.stage}>
      <div className={styles.cw + " " + styles.isDemo} ref={rootRef}>
        <div className={styles.tabs} ref={tabsBarRef} role="tablist" aria-label="플랜 탭">
          {plans.map((p, i) => (
            <button
              key={p.name}
              type="button"
              className={styles.tab + (i === 0 ? " " + styles.isActive : "")}
              role="tab"
              aria-selected={i === 0 ? "true" : "false"}
              tabIndex={i === 0 ? 0 : -1}
              ref={(el: HTMLButtonElement | null) => { tabRefs.current[i] = el; }}
            >{p.name}</button>
          ))}
        </div>
        <div className={styles.wrap}>
          {plans.map((p, i) => (
            <div
              key={p.name}
              className={styles.panel + (i === 0 ? " " + styles.isVisible : "")}
              role="tabpanel"
              tabIndex={0}
              hidden={i !== 0}
              ref={(el: HTMLDivElement | null) => { panelRefs.current[i] = el; }}
            >
              <span className={styles.num}>{p.price}</span>
              <p className={styles.line}>{p.line}</p>
            </div>
          ))}
        </div>
        <p className={styles.meta}>
          닦아낸 시작점 <b ref={rEl}>0</b>%
        </p>
      </div>
    </main>
  );
}