07Type rejection — a gate that computes the reason from MIME prefix matching and bounces the file

<main class="stage">
<div class="rt" id="rt">
  <p class="rt__hint" id="rtHint">Only types starting with image/ are accepted — others bounce back with a reason</p>
  <div class="rt__zone" id="rtZone" role="button" tabindex="0" aria-describedby="rtHint" aria-label="Image-only dropzone">
    <input type="file" id="rtInput" class="rt__file" aria-label="Choose file">
    <svg class="rt__ic" viewBox="0 0 256 256" aria-hidden="true"><g fill="currentColor"><path d="M224 56v122.06l-39.72-39.72a8 8 0 0 0-11.31 0L147.31 164l-49.65-49.66a8 8 0 0 0-11.32 0L32 168.69V56a8 8 0 0 1 8-8h176a8 8 0 0 1 8 8" opacity=".2"/><path d="M216 40H40a16 16 0 0 0-16 16v144a16 16 0 0 0 16 16h176a16 16 0 0 0 16-16V56a16 16 0 0 0-16-16m0 16v102.75l-26.07-26.06a16 16 0 0 0-22.63 0l-20 20l-44-44a16 16 0 0 0-22.62 0L40 149.37V56Zm0 144H40l68.69-68.68l72 72Z"/></g></svg>
    <span class="rt__file-name" id="rtFileName"></span>
  </div>
  <p class="rt__msg" id="rtMsg" aria-live="polite">Try dropping a file whose type starts with image/</p>
  <div class="rt__meta">
    <span class="rt__tag" id="rtTag">accepted 0 · rejected 0</span>
  </div>
</div>
</main>

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

$duration: 120ms;      // 거부 튕김(변형: 기본 240ms → 120ms)
$easing: $ease-out;
$color: $subject-blue-deep;

// 파스텔 강조(채도 .34 · 명도 +.11)
$p-warn: #ebe0d6;
$p-mint: #93d9c0;

@include stage($stage-paper);

.rt {
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: $sp-2;
}

.rt__hint {
  margin: 0;
  padding: 0 $sp-1;
  font-weight: 500;
  font-size: 11px;
  line-height: 1.4;
  color: $subject-ink;
}

.rt__zone {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: $sp-1;
  min-height: 76px;
  padding: $sp-3;
  border: 2px dashed rgba($subject-ink, .72);
  border-radius: $r-card;
  cursor: pointer;
  overflow: hidden;
  transition: border-color $dur-quick $ease-out, background $dur-quick $ease-out;
}

.rt__zone.is-over {
  border-color: $p-mint;
  background: rgba(147, 217, 192, .14);
}

.rt__zone.is-precheck-reject {
  border-color: $p-warn;
  background: rgba(243, 201, 161, .18);
  cursor: not-allowed;
}

.rt__zone.is-accept {
  border-color: $p-mint;
}

.rt__zone.is-reject-live {
  border-color: $p-warn;
}

.rt__file {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.rt__ic {
  width: 26px;
  height: 26px;
  color: $subject-ink;
  transition: transform $dur-quick $ease-pop;
}

.rt__zone.is-over .rt__ic {
  transform: scale(1.15);
}

.rt__file-name {
  max-width: 100%;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-weight: 700;
  font-size: 11px;
  color: $subject-ink;
}

.rt__msg {
  margin: 0;
  padding: $sp-1 $sp-2;
  min-height: 32px;
  border-radius: $r-sm;
  background: rgba($subject-ink, .06);
  font-weight: 500;
  font-size: 11px;
  line-height: 1.4;
  color: $subject-ink;
}

.rt__meta {
  display: flex;
  align-items: baseline;
  gap: $sp-2;
  padding: 0 $sp-1;
}

.rt__tag {
  font-weight: 700;
  font-size: 12px;
  color: $subject-ink;
}

@keyframes rtBounce {
  0% { transform: translateY(-10px); }
  55% { transform: translateY(2px); }
  100% { transform: translateY(0); }
}

@media (max-width: 340px) {
  .rt { max-width: 260px; gap: $sp-1; }
  .rt__hint { font-size: 9px; line-height: 1.25; }
  .rt__zone { min-height: 44px; padding: $sp-2; gap: $sp-1; }
  .rt__ic { width: 20px; height: 20px; }
  .rt__file-name, .rt__msg { font-size: 10px; }
  .rt__msg { min-height: 0; padding: $sp-1; }
}

@media (prefers-reduced-motion: reduce) {
  .rt__zone, .rt__ic { transition: none; }
  .rt__zone.is-over .rt__ic { transform: none; }
}

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

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

.rt {
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.rt__hint {
  margin: 0;
  padding: 0 4px;
  font-weight: 500;
  font-size: 11px;
  line-height: 1.4;
  color: #17141a;
}

.rt__zone {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  min-height: 76px;
  padding: 12px;
  border: 2px dashed rgba(23, 20, 26, 0.72);
  border-radius: 16px;
  cursor: pointer;
  overflow: hidden;
  transition: border-color 220ms ease-out, background 220ms ease-out;
}

.rt__zone.is-over {
  border-color: #93d9c0;
  background: rgba(147, 217, 192, 0.14);
}

.rt__zone.is-precheck-reject {
  border-color: #ebe0d6;
  background: rgba(243, 201, 161, 0.18);
  cursor: not-allowed;
}

.rt__zone.is-accept {
  border-color: #93d9c0;
}

.rt__zone.is-reject-live {
  border-color: #ebe0d6;
}

.rt__file {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.rt__ic {
  width: 26px;
  height: 26px;
  color: #17141a;
  transition: transform 220ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.rt__zone.is-over .rt__ic {
  transform: scale(1.15);
}

.rt__file-name {
  max-width: 100%;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-weight: 700;
  font-size: 11px;
  color: #17141a;
}

.rt__msg {
  margin: 0;
  padding: 4px 8px;
  min-height: 32px;
  border-radius: 8px;
  background: rgba(23, 20, 26, 0.06);
  font-weight: 500;
  font-size: 11px;
  line-height: 1.4;
  color: #17141a;
}

.rt__meta {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 0 4px;
}

.rt__tag {
  font-weight: 700;
  font-size: 12px;
  color: #17141a;
}

@keyframes rtBounce {
  0% {
    transform: translateY(-10px);
  }
  55% {
    transform: translateY(2px);
  }
  100% {
    transform: translateY(0);
  }
}
@media (max-width: 340px) {
  .rt {
    max-width: 260px;
    gap: 4px;
  }
  .rt__hint {
    font-size: 9px;
    line-height: 1.25;
  }
  .rt__zone {
    min-height: 44px;
    padding: 8px;
    gap: 4px;
  }
  .rt__ic {
    width: 20px;
    height: 20px;
  }
  .rt__file-name, .rt__msg {
    font-size: 10px;
  }
  .rt__msg {
    min-height: 0;
    padding: 4px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .rt__zone, .rt__ic {
    transition: none;
  }
  .rt__zone.is-over .rt__ic {
    transform: none;
  }
}

// Type rejection(07) — File.type.indexOf('image/')===0 (startsWith 대용) 로 허용 여부를 가르고,
// 거부된 파일은 CSS 트랜짓으로 원래 자리로 튕겨 돌아가며 aria-live 문구가 이유를 읽어준다.
// dragover 시점엔 아직 File 이 없어도 DataTransferItem.type 으로 미리 거부 신호(커서·테두리)를
// 낼 수 있다 — 드롭 전에 이미 계산이 끝나 있는 것이 이 데모의 축.
(function () {
  var zone = document.getElementById('rtZone');
  var input = document.getElementById('rtInput');
  var fnameEl = document.getElementById('rtFileName');
  var msgEl = document.getElementById('rtMsg');
  var tagEl = document.getElementById('rtTag');
  if (!zone || !input || !fnameEl || !msgEl || !tagEl) return;
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  var ALLOW = 'image/';
  var BOUNCE_MS = 120;   // 변형: 기본 240ms → 이 편은 120ms(queue 변형표)

  // 시나리오 — allowed up to/거부가 섞인 순서. startsWith(indexOf===0) 판정이 매번 갈린다.
  var FILES = [
    { name: 'photo-01.png', type: 'image/png' },
    { name: 'report.pdf', type: 'application/pdf' },
    { name: 'photo-02.jpg', type: 'image/jpeg' },
    { name: 'notes.txt', type: 'text/plain' }
  ];
  var accepted = 0, rejected = 0, cur = -1;

  function judge(type) { return type.startsWith(ALLOW); }   // File.type 의 접두사 판정

  function announce(f, ok) {
    fnameEl.textContent = f.name;
    if (ok) {
      accepted++;
      msgEl.textContent = f.name + ' accepted(' + f.type + ')';
      zone.classList.remove('is-reject-live');
      zone.classList.add('is-accept');
      if (!reduce) { zone.style.animation = 'none'; void zone.offsetWidth; zone.style.animation = ''; }
    } else {
      rejected++;
      msgEl.textContent = f.name + '  rejected — must start with image/ (got  ' + f.type + ')';
      zone.classList.remove('is-accept');
      zone.classList.add('is-reject-live');
      if (!reduce) {
        zone.style.animation = 'none';
        void zone.offsetWidth;
        zone.style.animation = 'rtBounce ' + BOUNCE_MS + 'ms ease-out';
      }
    }
    tagEl.textContent = 'accepted ' + accepted + ' · rejected  ' + rejected;
  }

  // 진짜 File 만 심사 — File.type 이 없는 시나리오 객체도 같은 규칙으로 재판정한다
  function isFileLike(file) { return !!(file && file.type !== undefined); }
  function intake(file) { if (isFileLike(file)) announce(file, judge(file.type)); }

  function virtualFile(spec) {
    try { return new File([new Blob(['x'])], spec.name, { type: spec.type }); }
    catch (e) { return spec; }
  }

  zone.addEventListener('dragover', function (e) {
    e.preventDefault();
    zone.classList.add('is-over');
    // 드롭 전 미리 판정 — items[0].type 은 File 없이도 읽힌다
    var items = e.dataTransfer && e.dataTransfer.items;
    var preOk = true;
    if (items && items.length) preOk = judge(items[0].type || '');
    zone.classList.toggle('is-precheck-reject', !preOk);
    if (e.dataTransfer) e.dataTransfer.dropEffect = preOk ? 'copy' : 'none';
  });
  zone.addEventListener('dragleave', function () {
    zone.classList.remove('is-over', 'is-precheck-reject');
  });
  zone.addEventListener('drop', function (e) {
    e.preventDefault();
    zone.classList.remove('is-over', 'is-precheck-reject');
    var file = e.dataTransfer && e.dataTransfer.files && e.dataTransfer.files[0];
    // File.type 이 image/ 로 시작하는지가 이 데모의 심판이다
    if (file) intake(file);
  });
  input.addEventListener('change', function () {
    var file = input.files && input.files[0];
    if (file) intake(file);
    input.value = '';
  });

  if (reduce) {
    intake(virtualFile(FILES[0]));
    setTimeout(function () { intake(virtualFile(FILES[1])); }, 30);
  } else {
    var nextAt = 0;
    (function loop(now) {
      if (now >= nextAt) {
        nextAt = now + 620;
        cur = (cur + 1) % FILES.length;
        intake(virtualFile(FILES[cur]));
      }
      requestAnimationFrame(loop);
    })(0);
  }
})();

// DropRejectType — vanilla 판(run/337/demo/07-drop-reject-type/index.html) 의 React 포트.
// dragover 단계에서 이미 e.dataTransfer.items[0].type 을 미리 읽어 허용 접두사와 비교해
// dropEffect 를 'none' 으로 앞당겨 결정한다(드롭 완료 전 판정 = 계산 한 겹). 실제 드롭에서도
// 같은 judge() 로 최종 판정해 튕김/수락 애니메이션을 가른다.
import { useEffect, useRef } from "react";
import styles from "./DropRejectType.module.scss";

export type DropRejectTypeProps = {
  duration?: string;
  easing?: string;
  color?: string;
};

const HINT = "허용 접두사 image/ 로 dragover 단계에서 먼저 판정해 드롭 전에 거부를 미리 표시합니다";
const ARIA_LABEL = "허용 형식 드롭존";

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

const ALLOW = "image/";
const BOUNCE_MS = 120;   // 변형: 큐 변형 칩 07(240ms→120ms) 적용값

type FileSpec = { name: string; type: string };
const FILES: FileSpec[] = [
  { name: "photo-01.png", type: "image/png" },
  { name: "report.pdf", type: "application/pdf" },
  { name: "photo-02.jpg", type: "image/jpeg" },
  { name: "notes.txt", type: "text/plain" }
];

function judge(type: string): boolean {
  return type.indexOf(ALLOW) === 0;
}

export default function DropRejectType({
  duration = "120ms",
  easing = "ease-out",
  color = "#0a4fe8"
}: DropRejectTypeProps) {
  const zoneRef = useRef<HTMLDivElement | null>(null);
  const inputRef = useRef<HTMLInputElement | null>(null);
  const fnameRef = useRef<HTMLElement | null>(null);
  const msgRef = useRef<HTMLParagraphElement | null>(null);
  const tagRef = useRef<HTMLSpanElement | null>(null);
  const rafRef = useRef(0) as Box<number>;
  const bounceTORef = useRef(0) as Box<number>;

  useEffect(() => {
    const zone = zoneRef.current;
    const input = inputRef.current;
    const fnameEl = fnameRef.current;
    const msgEl = msgRef.current;
    const tagEl = tagRef.current;
    if (!zone || !input || !fnameEl || !msgEl || !tagEl) return;
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    let accepted = 0, rejected = 0;

    function announce(f: FileSpec, ok: boolean): void {
      fnameEl!.textContent = f.name;
      tagEl!.textContent = f.type;
      if (ok) {
        accepted++;
        msgEl!.textContent = "수락 — accepted " + accepted + " · rejected " + rejected;
        zone!.classList.add(styles.zoneAccept);
        zone!.classList.remove(styles.zoneRejectLive);
        if (!reduce) {
          zone!.style.animation = "none";
          void zone!.offsetWidth;
          zone!.style.animation = "";
        }
      } else {
        rejected++;
        msgEl!.textContent = "거부 — " + f.type + " 는 " + ALLOW + " 형식이 아닙니다 (accepted " + accepted + " · rejected " + rejected + ")";
        zone!.classList.add(styles.zoneRejectLive);
        zone!.classList.remove(styles.zoneAccept);
        if (!reduce) {
          zone!.classList.remove(styles.bounceRun);
          void zone!.offsetWidth;
          zone!.classList.add(styles.bounceRun);
          window.clearTimeout(bounceTORef.current);
          bounceTORef.current = window.setTimeout(() => zone!.classList.remove(styles.bounceRun), BOUNCE_MS);
        }
      }
    }

    function intake(f: FileSpec): void {
      announce(f, judge(f.type));
    }

    function virtualFile(spec: FileSpec): File {
      try { return new File([new Blob(["x"])], spec.name, { type: spec.type }); }
      catch (e) { return new File([], spec.name); }
    }

    // dragover 단계 사전 판정 — 드롭 완료 전에 type 을 읽어 dropEffect 를 미리 결정
    function onOver(e: DragEvent): void {
      e.preventDefault();
      zone!.classList.add(styles.zoneOver);
      const items = e.dataTransfer && e.dataTransfer.items;
      if (items && items.length && items[0].type) {
        const ok = judge(items[0].type);
        zone!.classList.toggle(styles.zonePrecheckReject, !ok);
        if (e.dataTransfer) e.dataTransfer.dropEffect = ok ? "copy" : "none";
      }
    }
    function onLeave(): void {
      zone!.classList.remove(styles.zoneOver, styles.zonePrecheckReject);
    }
    function onDrop(e: DragEvent): void {
      e.preventDefault();
      zone!.classList.remove(styles.zoneOver, styles.zonePrecheckReject);
      const f = e.dataTransfer && e.dataTransfer.files && e.dataTransfer.files[0];
      if (f) intake({ name: f.name, type: f.type });
    }
    function onChange(): void {
      const f = input!.files && input!.files[0];
      if (f) intake({ name: f.name, type: f.type });
      input!.value = "";
    }
    zone.addEventListener("dragover", onOver as EventListener);
    zone.addEventListener("dragleave", onLeave);
    zone.addEventListener("drop", onDrop as EventListener);
    input.addEventListener("change", onChange);

    let cur = -1;
    if (reduce) {
      intake(FILES[0]);
    } else {
      let nextAt = 0;
      const step = (now: number): void => {
        if (now >= nextAt) {
          nextAt = now + 620;
          cur = (cur + 1) % FILES.length;
          intake(FILES[cur]);
        }
        rafRef.current = requestAnimationFrame(step);
      };
      rafRef.current = requestAnimationFrame(step);
    }

    return () => {
      cancelAnimationFrame(rafRef.current);
      window.clearTimeout(bounceTORef.current);
      zone.removeEventListener("dragover", onOver as EventListener);
      zone.removeEventListener("dragleave", onLeave);
      zone.removeEventListener("drop", onDrop as EventListener);
      input.removeEventListener("change", onChange);
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  return (
    <main className={styles.stage}>
      <div className={styles.rt}>
        <p className={styles.hint} id="rtHintReact">{HINT}</p>
        <div
          className={styles.zone}
          ref={zoneRef}
          role="button"
          tabIndex={0}
          aria-describedby="rtHintReact"
          aria-label={ARIA_LABEL}
        >
          <input type="file" accept="image/*" className={styles.file} ref={inputRef} aria-label="파일 선택" />
          <svg className={styles.ic} viewBox="0 0 256 256" aria-hidden="true">
            <g fill="currentColor">
              <path d="M208 56v144a8 8 0 0 1-8 8H56a8 8 0 0 1-8-8V56a8 8 0 0 1 8-8h144a8 8 0 0 1 8 8" opacity=".2" />
              <path d="M208.49 191.51L136.53 128l71.96-63.51a8 8 0 0 0-10.98-11.64L128 116.53L59.51 52.85a8 8 0 0 0-10.98 11.64L120.53 128l-71.96 63.51a8 8 0 1 0 10.6 12l.38-.34L128 139.47l68.49 63.71a8 8 0 0 0 11.34-.55a8 8 0 0 0-.34-11.12Z" />
            </g>
          </svg>
          <p className={styles.msg} ref={msgRef} aria-live="polite" />
          <p className={styles.meta}>
            <span className={styles.fileName} ref={fnameRef}>photo-01.png</span>
            <span className={styles.tag} ref={tagRef} style={{ color }}>image/png</span>
          </p>
        </div>
      </div>
    </main>
  );
}