07ドラッグで複数選択

<main class="stage">
<div class="ng is-demo" id="ng">
  <div class="ng__bar">
    <span class="ng__title">ノードを選ぶ</span>
    <span class="ng__badge">
      <span class="ng__num" aria-hidden="true"><span class="ng__digits" id="ngDigits"><i>0個選択</i><i>1個選択</i><i>2個選択</i><i>3個選択</i><i>4個選択</i></span></span>
    </span>
  </div>
  <div class="ng__canvas" id="ngCanvas">
    <svg class="ng__layer" viewBox="0 0 400 196" preserveAspectRatio="none" aria-hidden="true">
      <rect class="ng__marquee" id="ngMarquee" x="56" y="20" width="208" height="161"/>
    </svg>
    <div class="ng__node ng__node--a">
      <span class="ng__port ng__port--in" aria-hidden="true"></span>
      <span class="ng__name">受信</span>
      <span class="ng__port ng__port--out" aria-hidden="true"></span>
      <span class="ng__ring" aria-hidden="true"></span>
    </div>
    <div class="ng__node ng__node--b">
      <span class="ng__port ng__port--in" aria-hidden="true"></span>
      <span class="ng__name">絞り込み</span>
      <span class="ng__port ng__port--out" aria-hidden="true"></span>
      <span class="ng__ring" aria-hidden="true"></span>
    </div>
    <div class="ng__node ng__node--c">
      <span class="ng__port ng__port--in" aria-hidden="true"></span>
      <span class="ng__name">送信</span>
      <span class="ng__port ng__port--out" aria-hidden="true"></span>
      <span class="ng__ring" aria-hidden="true"></span>
    </div>
    <div class="ng__node ng__node--d">
      <span class="ng__port ng__port--in" aria-hidden="true"></span>
      <span class="ng__name">保存</span>
      <span class="ng__port ng__port--out" aria-hidden="true"></span>
      <span class="ng__ring" aria-hidden="true"></span>
    </div>
  </div>
  <p class="ng__sr" id="ngLive" aria-live="polite" data-tpl="ノードN個を選択">ノード0個を選択</p>
</div>
</main>

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

$duration: $dur-loop;    // 미리보기 루프 주기 — 설정 `초`(2s) 고정
$easing: $ease-out;      // 사각형이 사라질 때의 감속
$color: $subject-blue;   // 고른 상태의 색 — 테두리·사각형·배지

@include stage($stage-yellow);

.stage { position: relative; }

.ng { width: min(100%, 400px); display: flex; flex-direction: column; gap: $sp-2; }

.ng__bar { display: flex; align-items: center; justify-content: space-between; gap: $sp-2; }
.ng__title { font-weight: 800; font-size: clamp(10px, 2.8vw, 12px); line-height: 1.2; color: $subject-ink; letter-spacing: .01em; }
.ng__badge {
  display: inline-flex; align-items: center; gap: $sp-1; background: $subject-ink; color: $subject-cream;
  border-radius: $r-pill; padding: $sp-1 $sp-3; font-weight: 700; font-size: clamp(9px, 2.4vw, 10px); line-height: 1;
}
// 개수 문구를 세로로 쌓아 두고 한 칸씩 밀어 올린다 — 컷이라 반투명한 중간 숫자가 안 생긴다
.ng__num { display: inline-block; height: 12px; overflow: hidden; }
.ng__digits { display: block; transform: translateY(0); }
.ng__digits i { display: block; height: 12px; font-style: normal; font-weight: 800; font-size: 10px; line-height: 12px; white-space: nowrap; }

.ng__canvas {
  position: relative; width: 100%; height: clamp(132px, 42vw, 196px);
  background-color: $stage-paper;
  background-image: linear-gradient(to right, rgba($subject-ink, .10) 1px, transparent 1px),
                    linear-gradient(to bottom, rgba($subject-ink, .10) 1px, transparent 1px);
  background-size: 24px 24px;
  border-radius: $r-card; overflow: hidden; box-shadow: $shadow-press;
  touch-action: none; cursor: crosshair;
}

.ng__layer { position: absolute; inset: 0; display: block; width: 100%; height: 100%; }
.ng__marquee {
  fill: rgba($color, .16); stroke: $color; stroke-width: 2; stroke-dasharray: 6 4;
  // 굵기를 화면 px 으로 고정 — scale 로 키워도 점선이 두꺼워지지 않는다
  vector-effect: non-scaling-stroke;
  opacity: 0;
  // 비중심 origin: 끌기 시작점(사각형의 좌상단)에 붙어 자라는 요소라서 0 0 이다
  transform-box: fill-box; transform-origin: 0 0;
}
.ng__marquee.is-on { opacity: 1; }

.ng__node {
  position: absolute; width: 24%; height: 22%;
  display: flex; align-items: center; justify-content: center;
  background: $subject-cream; border: 1px solid rgba($subject-ink, .18);
  border-radius: $r-control; box-shadow: $shadow-press;
}
.ng__node--a { left: 20%; top: 16%; }
.ng__node--b { left: 56%; top: 20%; }
.ng__node--c { left: 24%; top: 60%; }
.ng__node--d { left: 70%; top: 62%; }
.ng__name { font-weight: 700; font-size: clamp(8px, 2.4vw, 11px); line-height: 1.1; color: $subject-ink; }
.ng__port {
  position: absolute; top: 50%; width: 7px; height: 7px; border-radius: 50%;
  background: $stage-paper; border: 2px solid rgba($subject-ink, .45); transform: translateY(-50%);
}
.ng__port--in { left: -5px; }
.ng__port--out { right: -5px; }
.ng__ring {
  position: absolute; inset: -4px; border: 2px solid $color; border-radius: $r-card;
  opacity: 0; pointer-events: none;
}
.ng__node.is-picked .ng__ring { opacity: 1; }

.ng__sr { position: absolute; width: 1px; height: 1px; margin: 0; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

// ── 미리보기 루프 (2s) : 사각형이 좌상단에서 우하단으로 연속으로 자라고
//    걸친 노드가 14.5% · 42.5% · 53.5% 에 차례로 컷으로 켜진다.
//    사각형만 90% 안에 사라지고 켜진 테두리는 남는다 — 화면이 비지 않게
.ng.is-demo .ng__marquee {
  animation-name: ngGrow, ngFade;
  animation-duration: $duration, $duration;
  animation-timing-function: linear, $easing;   // 자라는 건 등속(손가락 속도), 사라지는 건 감속
  animation-iteration-count: infinite, infinite;
  animation-fill-mode: backwards, backwards;
}
@keyframes ngGrow {
  0%, 8% { transform: scale(.02, .02); }
  64%, 100% { transform: scale(1, 1); }
}
@keyframes ngFade {
  0%, 7% { opacity: 0; }
  9%, 82% { opacity: 1; }
  90%, 100% { opacity: 0; }
}

.ng.is-demo .ng__digits {
  animation-name: ngCount; animation-duration: $duration; animation-timing-function: steps(1, end);
  animation-iteration-count: infinite; animation-fill-mode: backwards;
}
@keyframes ngCount {
  0% { transform: translateY(0); }
  14.5% { transform: translateY(-12px); }
  42.5% { transform: translateY(-24px); }
  53.5% { transform: translateY(-36px); }
  100% { transform: translateY(-36px); }
}

.ng.is-demo .ng__ring {
  animation-duration: $duration; animation-timing-function: steps(1, end);
  animation-iteration-count: infinite; animation-fill-mode: backwards;
}
.ng.is-demo .ng__node--a .ng__ring { animation-name: ngRingA; }
.ng.is-demo .ng__node--c .ng__ring { animation-name: ngRingC; }
.ng.is-demo .ng__node--b .ng__ring { animation-name: ngRingB; }
@keyframes ngRingA { 0% { opacity: 0; } 14.5% { opacity: 1; } 100% { opacity: 1; } }
@keyframes ngRingC { 0% { opacity: 0; } 42.5% { opacity: 1; } 100% { opacity: 1; } }
@keyframes ngRingB { 0% { opacity: 0; } 53.5% { opacity: 1; } 100% { opacity: 1; } }

// ── 320×200 폰 (BD9). 좁은 쪽에서는 값을 올리지 않는다
@media (max-width: 340px), (max-height: 220px) {
  .ng { gap: $sp-1; }
  .ng__badge { padding: 0 $sp-2; }
  .ng__title { font-size: 9px; }
}

@media (prefers-reduced-motion: reduce) {
  .ng.is-demo .ng__marquee,
  .ng.is-demo .ng__digits,
  .ng.is-demo .ng__ring { animation: none !important; }
  .ng.is-demo .ng__marquee { opacity: 1 !important; transform: scale(1, 1) !important; }
  .ng.is-demo .ng__ring { opacity: 1 !important; }
  .ng.is-demo .ng__node--d .ng__ring { opacity: 0 !important; }
  .ng.is-demo .ng__digits { transform: translateY(-36px) !important; }
}

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);
}

.stage {
  position: relative;
}

.ng {
  width: min(100%, 400px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ng__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.ng__title {
  font-weight: 800;
  font-size: clamp(10px, 2.8vw, 12px);
  line-height: 1.2;
  color: #17141a;
  letter-spacing: 0.01em;
}

.ng__badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: #17141a;
  color: #fff7e6;
  border-radius: 999px;
  padding: 4px 12px;
  font-weight: 700;
  font-size: clamp(9px, 2.4vw, 10px);
  line-height: 1;
}

.ng__num {
  display: inline-block;
  height: 12px;
  overflow: hidden;
}

.ng__digits {
  display: block;
  transform: translateY(0);
}

.ng__digits i {
  display: block;
  height: 12px;
  font-style: normal;
  font-weight: 800;
  font-size: 10px;
  line-height: 12px;
  white-space: nowrap;
}

.ng__canvas {
  position: relative;
  width: 100%;
  height: clamp(132px, 42vw, 196px);
  background-color: #ffffff;
  background-image: linear-gradient(to right, rgba(23, 20, 26, 0.1) 1px, transparent 1px), linear-gradient(to bottom, rgba(23, 20, 26, 0.1) 1px, transparent 1px);
  background-size: 24px 24px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  touch-action: none;
  cursor: crosshair;
}

.ng__layer {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
}

.ng__marquee {
  fill: rgba(47, 109, 246, 0.16);
  stroke: #2f6df6;
  stroke-width: 2;
  stroke-dasharray: 6 4;
  vector-effect: non-scaling-stroke;
  opacity: 0;
  transform-box: fill-box;
  transform-origin: 0 0;
}

.ng__marquee.is-on {
  opacity: 1;
}

.ng__node {
  position: absolute;
  width: 24%;
  height: 22%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff7e6;
  border: 1px solid rgba(23, 20, 26, 0.18);
  border-radius: 12px;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

.ng__node--a {
  left: 20%;
  top: 16%;
}

.ng__node--b {
  left: 56%;
  top: 20%;
}

.ng__node--c {
  left: 24%;
  top: 60%;
}

.ng__node--d {
  left: 70%;
  top: 62%;
}

.ng__name {
  font-weight: 700;
  font-size: clamp(8px, 2.4vw, 11px);
  line-height: 1.1;
  color: #17141a;
}

.ng__port {
  position: absolute;
  top: 50%;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #ffffff;
  border: 2px solid rgba(23, 20, 26, 0.45);
  transform: translateY(-50%);
}

.ng__port--in {
  left: -5px;
}

.ng__port--out {
  right: -5px;
}

.ng__ring {
  position: absolute;
  inset: -4px;
  border: 2px solid #2f6df6;
  border-radius: 16px;
  opacity: 0;
  pointer-events: none;
}

.ng__node.is-picked .ng__ring {
  opacity: 1;
}

.ng__sr {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.ng.is-demo .ng__marquee {
  animation-name: ngGrow, ngFade;
  animation-duration: 2s, 2s;
  animation-timing-function: linear, ease-out;
  animation-iteration-count: infinite, infinite;
  animation-fill-mode: backwards, backwards;
}

@keyframes ngGrow {
  0%, 8% {
    transform: scale(0.02, 0.02);
  }
  64%, 100% {
    transform: scale(1, 1);
  }
}
@keyframes ngFade {
  0%, 7% {
    opacity: 0;
  }
  9%, 82% {
    opacity: 1;
  }
  90%, 100% {
    opacity: 0;
  }
}
.ng.is-demo .ng__digits {
  animation-name: ngCount;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

@keyframes ngCount {
  0% {
    transform: translateY(0);
  }
  14.5% {
    transform: translateY(-12px);
  }
  42.5% {
    transform: translateY(-24px);
  }
  53.5% {
    transform: translateY(-36px);
  }
  100% {
    transform: translateY(-36px);
  }
}
.ng.is-demo .ng__ring {
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

.ng.is-demo .ng__node--a .ng__ring {
  animation-name: ngRingA;
}

.ng.is-demo .ng__node--c .ng__ring {
  animation-name: ngRingC;
}

.ng.is-demo .ng__node--b .ng__ring {
  animation-name: ngRingB;
}

@keyframes ngRingA {
  0% {
    opacity: 0;
  }
  14.5% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}
@keyframes ngRingC {
  0% {
    opacity: 0;
  }
  42.5% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}
@keyframes ngRingB {
  0% {
    opacity: 0;
  }
  53.5% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}
@media (max-width: 340px), (max-height: 220px) {
  .ng {
    gap: 4px;
  }
  .ng__badge {
    padding: 0 8px;
  }
  .ng__title {
    font-size: 9px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ng.is-demo .ng__marquee,
  .ng.is-demo .ng__digits,
  .ng.is-demo .ng__ring {
    animation: none !important;
  }
  .ng.is-demo .ng__marquee {
    opacity: 1 !important;
    transform: scale(1, 1) !important;
  }
  .ng.is-demo .ng__ring {
    opacity: 1 !important;
  }
  .ng.is-demo .ng__node--d .ng__ring {
    opacity: 0 !important;
  }
  .ng.is-demo .ng__digits {
    transform: translateY(-36px) !important;
  }
}

(function () {
  var ng = document.getElementById('ng');
  var canvas = document.getElementById('ngCanvas');
  var marquee = document.getElementById('ngMarquee');
  var digits = document.getElementById('ngDigits');
  var live = document.getElementById('ngLive');
  var nodes = canvas.querySelectorAll('.ng__node');
  var DIGIT_H = 12;                 // 숫자 한 칸 높이 — style.scss 의 .ng__digits i 높이와 같은 값
  var VIEW_W = 400, VIEW_H = 196;   // svg viewBox 단위. 화면 px 을 이 좌표로 되돌려 넣는다
  var start = null;

  function rectOf(el) {
    var r = el.getBoundingClientRect(), c = canvas.getBoundingClientRect();
    return { x: r.left - c.left, y: r.top - c.top, w: r.width, h: r.height };
  }
  function place(x, y, w, h) {
    var c = canvas.getBoundingClientRect();
    marquee.setAttribute('x', String(x / c.width * VIEW_W));
    marquee.setAttribute('y', String(y / c.height * VIEW_H));
    marquee.setAttribute('width', String(w / c.width * VIEW_W));
    marquee.setAttribute('height', String(h / c.height * VIEW_H));
  }
  function pick(x, y, w, h) {
    var n = 0;
    for (var i = 0; i < nodes.length; i++) {
      var b = rectOf(nodes[i]);
      var hit = b.x < x + w && b.x + b.w > x && b.y < y + h && b.y + b.h > y;
      nodes[i].classList.toggle('is-picked', hit);
      if (hit) n++;
    }
    digits.style.transform = 'translateY(' + (-DIGIT_H * n) + 'px)';
    live.textContent = live.getAttribute('data-tpl').replace('N', String(n));
  }
  canvas.addEventListener('pointerdown', function (e) {
    if (e.target.closest('.ng__node')) return;   // 빈 바닥에서만 사각형이 시작한다
    ng.classList.remove('is-demo');
    var c = canvas.getBoundingClientRect();
    start = { x: e.clientX - c.left, y: e.clientY - c.top };
    canvas.setPointerCapture(e.pointerId);
    marquee.classList.add('is-on');
    place(start.x, start.y, 0, 0);
    e.preventDefault();
  });
  canvas.addEventListener('pointermove', function (e) {
    if (!start) return;
    var c = canvas.getBoundingClientRect();
    var cx = e.clientX - c.left, cy = e.clientY - c.top;
    // 어느 방향으로 끌어도 되게 정규화한다 — 두 점 중 작은 쪽이 좌상단,
    // 차의 절댓값이 크기다. 이 두 줄이 없으면 왼쪽·위로 끌 때 사각형이 안 그려진다
    var x = Math.min(start.x, cx), y = Math.min(start.y, cy);
    var w = Math.abs(cx - start.x), h = Math.abs(cy - start.y);
    place(x, y, w, h);
    pick(x, y, w, h);
  });
  function stop() { start = null; marquee.classList.remove('is-on'); }
  canvas.addEventListener('pointerup', stop);
  canvas.addEventListener('pointercancel', stop);
})();

import { useRef, useState } from "react";
import styles from "./MarqueeSelect.module.scss";

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

// ambient 에 React 이벤트 제네릭이 없다 — 필요한 것만 로컬 타입으로 선언한다
type PointerEvt = { clientX: number; clientY: number; pointerId: number; target: any; preventDefault(): void };
type Box<T> = { current: T };
type Rect = { x: number; y: number; w: number; h: number };

const VIEW_W = 400;
const VIEW_H = 196;
const DIGIT_H = 12;
const NODES = [
  { key: "a", name: "받기", left: "20%", top: "16%" },
  { key: "b", name: "거르기", left: "56%", top: "20%" },
  { key: "c", name: "보내기", left: "24%", top: "60%" },
  { key: "d", name: "저장", left: "70%", top: "62%" },
];
const COUNTS = ["0개 선택", "1개 선택", "2개 선택", "3개 선택", "4개 선택"];
const LIVE = ["노드 0개 선택", "노드 1개 선택", "노드 2개 선택", "노드 3개 선택", "노드 4개 선택"];

export default function MarqueeSelect({ duration = 2000, easing = "ease-out", color = "#2f6df6" }: MarqueeSelectProps) {
  const [demo, setDemo] = useState(true);
  const [picked, setPicked] = useState<boolean[]>([false, false, false, false]);
  const [rect, setRect] = useState<Rect | null>(null);
  const canvasRef = useRef<any>(null) as Box<any>;
  const nodeRefs = useRef<any[]>([]) as Box<any[]>;
  const startRef = useRef<{ x: number; y: number } | null>(null) as Box<{ x: number; y: number } | null>;

  const count = picked.filter(Boolean).length;
  const rootStyle = { "--ngDur": duration + "ms", "--ngEase": easing, "--ngColor": color } as { [k: string]: string };

  function onDown(e: PointerEvt) {
    if (e.target && e.target.closest && e.target.closest("[data-node]")) return;   // 빈 바닥에서만 시작
    setDemo(false);
    const c = canvasRef.current.getBoundingClientRect();
    startRef.current = { x: e.clientX - c.left, y: e.clientY - c.top };
    canvasRef.current.setPointerCapture(e.pointerId);
    setRect({ x: (startRef.current.x / c.width) * VIEW_W, y: (startRef.current.y / c.height) * VIEW_H, w: 0, h: 0 });
    e.preventDefault();
  }
  function onMove(e: PointerEvt) {
    const s = startRef.current;
    if (!s) return;
    const c = canvasRef.current.getBoundingClientRect();
    const cx = e.clientX - c.left;
    const cy = e.clientY - c.top;
    // 어느 방향으로 끌어도 되게 정규화한다 — 두 점 중 작은 쪽이 좌상단, 차의 절댓값이 크기다
    const x = Math.min(s.x, cx);
    const y = Math.min(s.y, cy);
    const w = Math.abs(cx - s.x);
    const h = Math.abs(cy - s.y);
    setRect({ x: (x / c.width) * VIEW_W, y: (y / c.height) * VIEW_H, w: (w / c.width) * VIEW_W, h: (h / c.height) * VIEW_H });
    setPicked(
      nodeRefs.current.map(function (el: any) {
        if (!el) return false;
        const r = el.getBoundingClientRect();
        return r.left - c.left < x + w && r.right - c.left > x && r.top - c.top < y + h && r.bottom - c.top > y;
      })
    );
  }
  function onUp() {
    startRef.current = null;
    setRect(null);
  }

  return (
    <main className={styles.stage}>
      <div className={demo ? styles.ng + " " + styles.isDemo : styles.ng} style={rootStyle}>
        <div className={styles.bar}>
          <span className={styles.title}>노드 고르기</span>
          <span className={styles.badge}>
            <span className={styles.num} aria-hidden="true">
              <span
                className={styles.digits}
                style={demo ? undefined : { transform: "translateY(" + -DIGIT_H * count + "px)" }}
              >
                {COUNTS.map((c) => (
                  <i key={c}>{c}</i>
                ))}
              </span>
            </span>
          </span>
        </div>
        <div
          className={styles.canvas}
          ref={(el: any) => { canvasRef.current = el; }}
          onPointerDown={onDown}
          onPointerMove={onMove}
          onPointerUp={onUp}
          onPointerCancel={onUp}
        >
          <svg className={styles.layer} viewBox={"0 0 " + VIEW_W + " " + VIEW_H} preserveAspectRatio="none" aria-hidden="true">
            <rect
              className={rect ? styles.marquee + " " + styles.isOn : styles.marquee}
              x={rect ? rect.x : 56}
              y={rect ? rect.y : 20}
              width={rect ? rect.w : 208}
              height={rect ? rect.h : 161}
            />
          </svg>
          {NODES.map((n, i) => (
            <div
              key={n.key}
              data-node={n.key}
              ref={(el: any) => { nodeRefs.current[i] = el; }}
              className={[styles.node, styles["node_" + n.key], picked[i] ? styles.isPicked : ""].join(" ")}
              style={{ left: n.left, top: n.top }}
            >
              <span className={styles.port + " " + styles.portIn} aria-hidden="true" />
              <span className={styles.name}>{n.name}</span>
              <span className={styles.port + " " + styles.portOut} aria-hidden="true" />
              <span className={styles.ring} aria-hidden="true" />
            </div>
          ))}
        </div>
        <p className={styles.sr} aria-live="polite">{LIVE[count]}</p>
      </div>
    </main>
  );
}