07インライン編集+文字数カウントダウン

<main class="stage">
<ul class="list is-demo" id="list">
  <li class="row" data-id="0">
    <span class="display" id="display-0" tabindex="0" role="button" aria-label="編集するには選択">アイスを買う</span>
  </li>
  <li class="row" data-id="1">
    <span class="display" id="display-1" tabindex="0" role="button" aria-label="編集するには選択">洗濯物を取りに行く</span>
  </li>
  <li class="row" data-id="2">
    <span class="display" id="display-2" tabindex="0" role="button" aria-label="編集するには選択">書斎の照明交換</span>
  </li>
</ul>
<span class="mirror" id="mirror" aria-hidden="true"></span>
</main>

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

// 계산 겹은 index.html 의 measureWidth() 에 있다 — 숨은 미러 span 으로 실제 텍스트 폭을 재서
// input 너비를 그 값에 맞춘다(고정 너비가 아니다).
@include stage($stage-orange);

.list {
  list-style: none;
  margin: 0;
  padding: 0;
  width: 280px;
  display: grid;
  gap: $sp-2;
}

.row {
  padding: $sp-2 $sp-3;
  border-radius: $r-sm;
  background: $subject-cream;
}

.display {
  display: inline-block;
  color: $subject-ink;
  font-size: 13px;
  padding: $sp-1 $sp-1;
  cursor: pointer;
  border-radius: $r-xs;

  &:focus-visible { outline: 2px solid $subject-blue-light; outline-offset: 2px; }
}

.editWrap {
  display: inline-flex;
  align-items: center;
  gap: $sp-2;
}

.editInput {
  appearance: none;
  border: 1px solid rgba($subject-ink, .2);
  border-radius: $r-xs;
  padding: 4px 8px;
  font-size: 13px;
  color: $subject-ink;
  background: #fff;
  transition: width $dur-quick $ease-out, border-color $dur-quick $ease-out;

  &.warn { border-color: $error; }
  &:focus-visible { outline: 2px solid $subject-blue-light; outline-offset: 2px; }
}

.countBadge {
  font-size: 11px;
  font-weight: 700;
  color: rgba($subject-ink, .5);
  min-width: 16px;
  text-align: right;

  &.warn { color: $error; }
  &.shake { animation: shakeBadge $dur-quick $ease-out; }
}

.mirror {
  position: absolute;
  left: -9999px;
  top: -9999px;
  white-space: pre;
  font-size: 13px;
}

@keyframes shakeBadge {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-2px); }
  75% { transform: translateX(2px); }
}

@media (max-width: 340px) {
  .list { width: 220px; }
}

@media (prefers-reduced-motion: reduce) {
  // 실사용 경로에도 적용 — 너비는 즉시 바뀌고(전환 없음), 경고 흔들림은 재생하지 않는다(js 쪽 분기)
  .editInput { transition: none !important; }
  .countBadge.shake { animation: none !important; }
}

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);
}

.list {
  list-style: none;
  margin: 0;
  padding: 0;
  width: 280px;
  display: grid;
  gap: 8px;
}

.row {
  padding: 8px 12px;
  border-radius: 8px;
  background: #fff7e6;
}

.display {
  display: inline-block;
  color: #17141a;
  font-size: 13px;
  padding: 4px 4px;
  cursor: pointer;
  border-radius: 4px;
}
.display:focus-visible {
  outline: 2px solid #5b8cf8;
  outline-offset: 2px;
}

.editWrap {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.editInput {
  appearance: none;
  border: 1px solid rgba(23, 20, 26, 0.2);
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 13px;
  color: #17141a;
  background: #fff;
  transition: width 220ms ease-out, border-color 220ms ease-out;
}
.editInput.warn {
  border-color: #c2361a;
}
.editInput:focus-visible {
  outline: 2px solid #5b8cf8;
  outline-offset: 2px;
}

.countBadge {
  font-size: 11px;
  font-weight: 700;
  color: rgba(23, 20, 26, 0.5);
  min-width: 16px;
  text-align: right;
}
.countBadge.warn {
  color: #c2361a;
}
.countBadge.shake {
  animation: shakeBadge 220ms ease-out;
}

.mirror {
  position: absolute;
  left: -9999px;
  top: -9999px;
  white-space: pre;
  font-size: 13px;
}

@keyframes shakeBadge {
  0%, 100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-2px);
  }
  75% {
    transform: translateX(2px);
  }
}
@media (max-width: 340px) {
  .list {
    width: 220px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .editInput {
    transition: none !important;
  }
  .countBadge.shake {
    animation: none !important;
  }
}

(function () {
  var MAX_LEN = 24;
  var WARN_AT = 8; // 남은 글자 수가 이 값 이하면 경고
  var MIN_W = 90, MAX_W = 220;
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  var list = document.getElementById('list');
  var mirror = document.getElementById('mirror');

  function human() { list.classList.remove('is-demo'); window.clearInterval(autoTimer); }

  // 계산 겹: 실제 텍스트 폭을 숨은 미러 span 으로 측정해(scrollWidth) input 너비를 그 값에 맞춘다.
  function measureWidth(text) {
    mirror.textContent = text || ' ';
    var w = mirror.getBoundingClientRect().width + 24;
    return Math.max(MIN_W, Math.min(MAX_W, w));
  }

  function enterEdit(row) {
    var display = row.querySelector('.display');
    var text = display.textContent;
    var wrap = document.createElement('span');
    wrap.className = 'editWrap';
    var input = document.createElement('input');
    input.className = 'editInput';
    input.type = 'text';
    input.value = text;
    input.maxLength = MAX_LEN;
    input.setAttribute('aria-label', 'やることの内容を編集');
    var badge = document.createElement('span');
    badge.className = 'countBadge';
    wrap.appendChild(input);
    wrap.appendChild(badge);
    display.replaceWith(wrap);

    function paint() {
      var remain = MAX_LEN - input.value.length;
      badge.textContent = String(remain);
      input.style.width = measureWidth(input.value) + 'px';
      var warn = remain <= WARN_AT;
      badge.classList.toggle('warn', warn);
      input.classList.toggle('warn', warn);
      if (warn && !reduce) {
        badge.classList.remove('shake');
        void badge.offsetWidth;
        badge.classList.add('shake');
      }
    }

    function save() {
      var val = input.value.trim() || text;
      var newDisplay = document.createElement('span');
      newDisplay.className = 'display';
      newDisplay.id = display.id;
      newDisplay.tabIndex = 0;
      newDisplay.setAttribute('role', 'button');
      newDisplay.setAttribute('aria-label', '編集するには選択');
      newDisplay.textContent = val;
      wrap.replaceWith(newDisplay);
      bindDisplay(newDisplay);
    }

    input.addEventListener('input', function () { human(); paint(); });
    input.addEventListener('keydown', function (e) {
      human();
      if (e.key === 'Enter') { e.preventDefault(); save(); }
      else if (e.key === 'Escape') { input.value = text; save(); }
    });
    input.addEventListener('blur', save);

    paint();
    input.focus({ preventScroll: true });
    input.setSelectionRange(input.value.length, input.value.length);
    return input;
  }

  function bindDisplay(display) {
    display.addEventListener('click', function () { human(); enterEdit(display.closest('.row')); });
    display.addEventListener('keydown', function (e) {
      if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); human(); enterEdit(display.closest('.row')); }
    });
  }

  Array.prototype.forEach.call(list.querySelectorAll('.display'), bindDisplay);

  var SCRIPT = [
    { id: 0, append: ' (コンビニもスーパーも)' },
    { id: 1, append: ' 今夜まで' }
  ];
  var cursor = 0;
  function autoStep() {
    var step = SCRIPT[cursor];
    var row = list.querySelector('.row[data-id="' + step.id + '"]');
    var display = row.querySelector('.display');
    if (!display) { cursor = (cursor + 1) % SCRIPT.length; return; }
    var input = enterEdit(row);
    var base = input.value;
    var full = (base + step.append).slice(0, MAX_LEN);
    var i = base.length;
    var typeIv = setInterval(function () {
      i++;
      input.value = full.slice(0, i);
      input.dispatchEvent(new Event('input'));
      if (i >= full.length) {
        clearInterval(typeIv);
        window.setTimeout(function () {
          input.dispatchEvent(new KeyboardEvent('keydown', { key: 'Enter' }));
        }, 260);
      }
    }, 70);
    cursor = (cursor + 1) % SCRIPT.length;
  }
  var autoTimer;
  if (!reduce) { autoTimer = window.setInterval(autoStep, 1700); }
})();

// InlineEdit — vanilla 판(run/377/demo/07-inline-edit/index.html) 의 React 포트.
// 계산 겹: 숨은 미러 span 으로 실제 텍스트 폭을 재서 input 너비를 그 값에 맞춘다.
import { useEffect, useRef, useState } from "react";
import type { ChangeEvent } from "react";
// KeyboardEvent 는 "react" 스텁이 export 하지 않는다(demo.py ambient.d.ts) — lib.dom 의 전역 타입을 그대로 쓴다.
import styles from "./InlineEdit.module.scss";

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

const MAX_LEN = 24;
const WARN_AT = 8;
const MIN_W = 90;
const MAX_W = 220;

const ROWS = [
  { id: 0, text: "아이스크림 사기" },
  { id: 1, text: "세탁물 찾아오기" },
  { id: 2, text: "서재 조명 교체" },
];

const SCRIPT = [
  { id: 0, append: " (편의점, 마트 둘 다)" },
  { id: 1, append: " 오늘 저녁까지" },
];

export default function InlineEdit() {
  const [isDemo, setIsDemo] = useState(true);
  const [values, setValues] = useState(ROWS.map(function (r) { return r.text; }));
  const [editing, setEditing] = useState(-1);
  const [draft, setDraft] = useState("");
  const [width, setWidth] = useState(MIN_W);
  const [shakeKey, setShakeKey] = useState(0);
  const mirrorRef = useRef(null) as unknown as Box<HTMLSpanElement>;
  const inputRef = useRef(null) as unknown as Box<HTMLInputElement | null>;
  const timerRef = useRef(0) as unknown as Box<number>;

  const reduce = typeof window !== "undefined" && window.matchMedia("(prefers-reduced-motion: reduce)").matches;

  function human() {
    if (isDemo) { setIsDemo(false); window.clearInterval(timerRef.current); }
  }

  function measureWidth(text: string) {
    const mirror = mirrorRef.current;
    if (!mirror) return MIN_W;
    mirror.textContent = text || " ";
    const w = mirror.getBoundingClientRect().width + 24;
    return Math.max(MIN_W, Math.min(MAX_W, w));
  }

  function startEdit(i: number) {
    human();
    setEditing(i);
    setDraft(values[i]);
    setWidth(measureWidth(values[i]));
  }

  function onDraftChange(v: string) {
    setDraft(v);
    setWidth(measureWidth(v));
    const remain = MAX_LEN - v.length;
    if (remain <= WARN_AT && !reduce) setShakeKey(function (k) { return k + 1; });
  }

  function save() {
    const i = editing;
    if (i < 0) return;
    setValues(function (prev) {
      const n = prev.slice();
      n[i] = draft.trim() || prev[i];
      return n;
    });
    setEditing(-1);
  }

  function cancel() {
    setEditing(-1);
  }

  useEffect(function () {
    if (editing >= 0 && inputRef.current) {
      inputRef.current.focus({ preventScroll: true });
      const len = inputRef.current.value.length;
      inputRef.current.setSelectionRange(len, len);
    }
  }, [editing]);

  useEffect(function () {
    if (reduce) return;
    let cursor = 0;
    function autoStep() {
      const step = SCRIPT[cursor];
      cursor = (cursor + 1) % SCRIPT.length;
      startEdit(step.id);
      const base = ROWS[step.id].text;
      const full = (base + step.append).slice(0, MAX_LEN);
      let i = base.length;
      const typeIv = window.setInterval(function () {
        i++;
        const v = full.slice(0, i);
        setDraft(v);
        setWidth(measureWidth(v));
        if (i >= full.length) {
          window.clearInterval(typeIv);
          window.setTimeout(function () {
            setValues(function (prev) {
              const n = prev.slice();
              n[step.id] = v.trim() || prev[step.id];
              return n;
            });
            setEditing(-1);
          }, 260);
        }
      }, 70);
    }
    autoStep();
    timerRef.current = window.setInterval(autoStep, 1700);
    return function () { window.clearInterval(timerRef.current); };
    // eslint-disable-next-line
  }, []);

  const remain = MAX_LEN - draft.length;
  const warn = editing >= 0 && remain <= WARN_AT;

  return (
    <main className={styles.stage}>
      <ul className={styles.list + (isDemo ? " " + styles.isDemo : "")}>
        {ROWS.map(function (row, i) {
          if (editing === i) {
            return (
              <li key={row.id} className={styles.row}>
                <span className={styles.editWrap}>
                  <input
                    ref={inputRef}
                    className={styles.editInput + (warn ? " " + styles.warn : "")}
                    type="text"
                    value={draft}
                    maxLength={MAX_LEN}
                    aria-label="할 일 내용 수정"
                    style={{ width: width + "px" }}
                    onChange={function (e: ChangeEvent<HTMLInputElement>) { human(); onDraftChange(e.target.value); }}
                    onKeyDown={function (e: KeyboardEvent) {
                      human();
                      if (e.key === "Enter") { e.preventDefault(); save(); }
                      else if (e.key === "Escape") { cancel(); }
                    }}
                    onBlur={save}
                  />
                  <span key={shakeKey} className={styles.countBadge + (warn ? " " + styles.warn + " " + styles.shake : "")}>{remain}</span>
                </span>
              </li>
            );
          }
          return (
            <li key={row.id} className={styles.row}>
              <span
                className={styles.display}
                tabIndex={0}
                role="button"
                aria-label="수정하려면 선택"
                onClick={function () { startEdit(i); }}
                onKeyDown={function (e: KeyboardEvent) { if (e.key === "Enter" || e.key === " ") { e.preventDefault(); startEdit(i); } }}
              >
                {values[i]}
              </span>
            </li>
          );
        })}
      </ul>
      <span ref={mirrorRef} className={styles.mirror} aria-hidden="true" />
    </main>
  );
}