08Card corner grip

<main class="stage">
  <div class="cg is-demo" id="cg-root">
    <div class="cg__field">
      <div class="cg__card" id="cg-card">
        <span class="cg__row"></span>
        <span class="cg__row cg__row--short"></span>
        <span class="cg__size"></span>
        <i class="cg__grip" id="cg-grip" role="slider" tabindex="0"
           aria-label="Card size" aria-valuemin="120" aria-valuemax="220" aria-valuenow="176"></i>
      </div>
    </div>
    <button class="cg__lock is-on" id="cg-lock" type="button" aria-pressed="true">
      <span class="cg__ico" aria-hidden="true"><svg viewBox="0 0 256 256"><g fill="currentColor"><path d="M216 96v112a8 8 0 0 1-8 8H48a8 8 0 0 1-8-8V96a8 8 0 0 1 8-8h160a8 8 0 0 1 8 8" opacity=".2"/><path d="M208 80h-32V56a48 48 0 0 0-96 0v24H48a16 16 0 0 0-16 16v112a16 16 0 0 0 16 16h160a16 16 0 0 0 16-16V96a16 16 0 0 0-16-16M96 56a32 32 0 0 1 64 0v24H96Zm112 152H48V96h160z"/></g></svg></span>
      Lock ratio
    </button>
  </div>
</main>

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

$duration: $dur-quick;
$easing: $ease-spring;
$color: $subject-blue;

@include stage($stage-yellow);

@property --w {
  syntax: "<length>";
  inherits: true;
  initial-value: 176px;
}
@property --h {
  syntax: "<length>";
  inherits: true;
  initial-value: 96px;
}
// 숫자도 등록해 둬야 키프레임에서 정수로 보간된다 — counter 가 이 값을 읽는다
@property --wn {
  syntax: "<integer>";
  inherits: true;
  initial-value: 176;
}
@property --hn {
  syntax: "<integer>";
  inherits: true;
  initial-value: 96;
}

.cg {
  --w: 176px;
  --h: 96px;
  --wn: 176;
  --hn: 96;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-3;
}
// 카드가 커져도 무대 높이가 안 흔들리게 자리를 미리 잡아 둔다
.cg__field {
  display: grid;
  place-items: start center;
  width: 228px;
  max-width: 92vw;
  height: 124px;
}
.cg__card {
  position: relative;
  box-sizing: border-box;
  width: min(var(--w), 100%);
  height: var(--h);
  display: flex;
  flex-direction: column;
  gap: $sp-2;
  padding: $sp-3;
  border-radius: $r-card;
  background: $subject-ink;
  box-shadow: $shadow-raised;
  overflow: hidden;
}
.cg__row {
  flex: 0 0 auto;
  height: 8px;
  border-radius: $r-xs;
  background: rgba(255, 247, 230, .32);
}
.cg__row--short { width: 56%; background: $color; }
.cg__size {
  margin-top: auto;
  counter-reset: wn var(--wn) hn var(--hn);
  color: $subject-cream;
  font-size: 11px;
  line-height: 14px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.cg__size::after { content: counter(wn) " × " counter(hn); }
.cg__grip {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 20px;
  height: 20px;
  cursor: nwse-resize;
  touch-action: none;
  // 코너 삼각형 — 두 줄이 같은 꼭짓점에서 갈라진다
  background:
    linear-gradient(135deg, transparent 48%, #{$subject-cream} 48%, #{$subject-cream} 58%, transparent 58%),
    linear-gradient(135deg, transparent 70%, #{$subject-cream} 70%, #{$subject-cream} 80%, transparent 80%);
}
.cg__grip:focus-visible { outline: 2px solid $color; outline-offset: -2px; }

.cg__lock {
  display: inline-flex;
  align-items: center;
  gap: $sp-2;
  height: 24px;
  padding: 0 $sp-3;
  border: 1px solid rgba(23, 20, 26, .28);
  border-radius: $r-pill;
  background: transparent;
  color: rgba(23, 20, 26, .8);
  font-family: inherit;
  font-size: 11px;
  line-height: 20px;
  font-weight: 700;
  cursor: pointer;
  transition: background $duration $easing, color $duration $easing;
}
.cg__lock.is-on {
  background: $subject-ink;
  border-color: $subject-ink;
  color: $subject-cream;
}
.cg__ico { display: block; width: 14px; height: 14px; }
.cg__ico svg { display: block; width: 14px; height: 14px; }
.cg__lock:focus-visible { outline: 2px solid $subject-ink; outline-offset: 2px; }

// ── 자동 루프: 비율을 지킨 채 커졌다 작아진다 ──
.cg.is-demo {
  animation-name: cg-size;
  animation-duration: $dur-loop;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
}
@keyframes cg-size {
  0%, 8% { --w: 176px; --h: 96px; --wn: 176; --hn: 96; }
  40% { --w: 220px; --h: 120px; --wn: 220; --hn: 120; }
  68% { --w: 124px; --h: 68px; --wn: 124; --hn: 68; }
  88%, 100% { --w: 176px; --h: 96px; --wn: 176; --hn: 96; }
}

@media (prefers-reduced-motion: reduce) {
  .cg.is-demo { animation: none !important; }
  .cg__lock { transition: none; }
}

@media (max-width: 340px) {
  .cg__card { padding: $sp-2; }
}

@charset "UTF-8";
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);
}

@property --w {
  syntax: "<length>";
  inherits: true;
  initial-value: 176px;
}
@property --h {
  syntax: "<length>";
  inherits: true;
  initial-value: 96px;
}
@property --wn {
  syntax: "<integer>";
  inherits: true;
  initial-value: 176;
}
@property --hn {
  syntax: "<integer>";
  inherits: true;
  initial-value: 96;
}
.cg {
  --w: 176px;
  --h: 96px;
  --wn: 176;
  --hn: 96;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.cg__field {
  display: grid;
  place-items: start center;
  width: 228px;
  max-width: 92vw;
  height: 124px;
}

.cg__card {
  position: relative;
  box-sizing: border-box;
  width: min(var(--w), 100%);
  height: var(--h);
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px;
  border-radius: 16px;
  background: #17141a;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  overflow: hidden;
}

.cg__row {
  flex: 0 0 auto;
  height: 8px;
  border-radius: 4px;
  background: rgba(255, 247, 230, 0.32);
}

.cg__row--short {
  width: 56%;
  background: #2f6df6;
}

.cg__size {
  margin-top: auto;
  counter-reset: wn var(--wn) hn var(--hn);
  color: #fff7e6;
  font-size: 11px;
  line-height: 14px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.cg__size::after {
  content: counter(wn) " × " counter(hn);
}

.cg__grip {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 20px;
  height: 20px;
  cursor: nwse-resize;
  touch-action: none;
  background: linear-gradient(135deg, transparent 48%, #fff7e6 48%, #fff7e6 58%, transparent 58%), linear-gradient(135deg, transparent 70%, #fff7e6 70%, #fff7e6 80%, transparent 80%);
}

.cg__grip:focus-visible {
  outline: 2px solid #2f6df6;
  outline-offset: -2px;
}

.cg__lock {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 24px;
  padding: 0 12px;
  border: 1px solid rgba(23, 20, 26, 0.28);
  border-radius: 999px;
  background: transparent;
  color: rgba(23, 20, 26, 0.8);
  font-family: inherit;
  font-size: 11px;
  line-height: 20px;
  font-weight: 700;
  cursor: pointer;
  transition: background 220ms cubic-bezier(0.2, 0.8, 0.2, 1), color 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.cg__lock.is-on {
  background: #17141a;
  border-color: #17141a;
  color: #fff7e6;
}

.cg__ico {
  display: block;
  width: 14px;
  height: 14px;
}

.cg__ico svg {
  display: block;
  width: 14px;
  height: 14px;
}

.cg__lock:focus-visible {
  outline: 2px solid #17141a;
  outline-offset: 2px;
}

.cg.is-demo {
  animation-name: cg-size;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}

@keyframes cg-size {
  0%, 8% {
    --w: 176px;
    --h: 96px;
    --wn: 176;
    --hn: 96;
  }
  40% {
    --w: 220px;
    --h: 120px;
    --wn: 220;
    --hn: 120;
  }
  68% {
    --w: 124px;
    --h: 68px;
    --wn: 124;
    --hn: 68;
  }
  88%, 100% {
    --w: 176px;
    --h: 96px;
    --wn: 176;
    --hn: 96;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cg.is-demo {
    animation: none !important;
  }
  .cg__lock {
    transition: none;
  }
}
@media (max-width: 340px) {
  .cg__card {
    padding: 8px;
  }
}

// 실제 동작: 코너 그립의 포인터 델타로 폭·높이를 함께 바꾼다. 잠금이 켜져 있으면 높이는 폭 × 처음 비율.
var root = document.getElementById('cg-root');
var card = document.getElementById('cg-card');
var grip = document.getElementById('cg-grip');
var lock = document.getElementById('cg-lock');
var RATIO = 96 / 176, locked = true, dragging = false, w0 = 0, h0 = 0, x0 = 0, y0 = 0;

function set(w, h) {
  var W = Math.max(120, Math.min(Math.round(w), 220));
  var H = locked ? Math.round(W * RATIO) : Math.max(64, Math.min(Math.round(h), 132));
  root.style.setProperty('--w', W + 'px');
  root.style.setProperty('--h', H + 'px');
  // 숫자 표시는 counter 가 읽는 --wn/--hn 한 쌍이다. 자동 루프도 같은 값을 움직이므로
  // 카드 크기와 글자가 어긋나는 프레임이 없다
  root.style.setProperty('--wn', String(W));
  root.style.setProperty('--hn', String(H));
  grip.setAttribute('aria-valuenow', String(W));
}
lock.addEventListener('click', function () {
  locked = !locked;
  lock.classList.toggle('is-on', locked);
  lock.setAttribute('aria-pressed', String(locked));
  root.classList.toggle('is-aspect', locked);
});
grip.addEventListener('pointerdown', function (e) {
  root.classList.remove('is-demo');
  dragging = true;
  var r = card.getBoundingClientRect();
  w0 = r.width; h0 = r.height; x0 = e.clientX; y0 = e.clientY;
  grip.setPointerCapture(e.pointerId);
  e.preventDefault();
});
grip.addEventListener('pointermove', function (e) {
  if (!dragging) return;
  set(w0 + (e.clientX - x0), h0 + (e.clientY - y0));
});
grip.addEventListener('pointerup', function () { dragging = false; });
grip.addEventListener('keydown', function (e) {
  var d = e.key === 'ArrowLeft' ? -8 : e.key === 'ArrowRight' ? 8 : 0;
  if (!d) return;
  root.classList.remove('is-demo');
  var n = Number(grip.getAttribute('aria-valuenow')) + d;
  set(n, n * RATIO);
  grip.focus({ preventScroll: true });
  e.preventDefault();
});

import { useRef, useState } from "react";
import type { CSSProperties } from "react";
import styles from "./CornerResizeCard.module.scss";

export type CornerResizeCardProps = {
  startWidth?: number;
  startHeight?: number;
  duration?: number;
  easing?: string;
  color?: string;
};

type PEvt = { clientX: number; clientY: number; pointerId: number; preventDefault(): void; currentTarget: { setPointerCapture(id: number): void } };
type KeyEvt = { key: string; preventDefault(): void };
type Box<T> = { current: T };
type Grab = { w: number; h: number; x: number; y: number; on: boolean };
type Vars = CSSProperties & {
  "--w"?: string; "--h"?: string; "--wn"?: string; "--hn"?: string;
  "--duration"?: string; "--easing"?: string; "--color"?: string;
};

export default function CornerResizeCard({
  startWidth = 176,
  startHeight = 96,
  duration = 220,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: CornerResizeCardProps) {
  const ratio = startHeight / startWidth;
  const [size, setSize] = useState({ w: startWidth, h: startHeight });
  const [locked, setLocked] = useState(true);
  const cardRef = useRef<HTMLDivElement>(null);
  const from = useRef({ w: 0, h: 0, x: 0, y: 0, on: false }) as Box<Grab>;

  function set(w: number, h: number): void {
    const W = Math.max(120, Math.min(Math.round(w), 220));
    const H = locked ? Math.round(W * ratio) : Math.max(64, Math.min(Math.round(h), 132));
    setSize({ w: W, h: H });
  }
  function onDown(e: PEvt): void {
    const card = cardRef.current;
    if (!card) return;
    const r = card.getBoundingClientRect();
    from.current = { w: r.width, h: r.height, x: e.clientX, y: e.clientY, on: true };
    e.currentTarget.setPointerCapture(e.pointerId);
    e.preventDefault();
  }
  function onMove(e: PEvt): void {
    if (!from.current.on) return;
    set(from.current.w + (e.clientX - from.current.x), from.current.h + (e.clientY - from.current.y));
  }
  function onUp(): void { from.current.on = false; }
  function onKey(e: KeyEvt): void {
    const d = e.key === "ArrowLeft" ? -8 : e.key === "ArrowRight" ? 8 : 0;
    if (!d) return;
    set(size.w + d, (size.w + d) * ratio);
    e.preventDefault();
  }

  const vars: Vars = {
    "--w": `${size.w}px`,
    "--h": `${size.h}px`,
    "--wn": String(size.w),
    "--hn": String(size.h),
    "--duration": `${duration}ms`,
    "--easing": easing,
    "--color": color,
  };

  return (
    <div className={locked ? `${styles.cg} ${styles.isAspect}` : styles.cg} style={vars}>
      <div className={styles.field}>
        <div className={styles.card} ref={cardRef}>
          <span className={styles.row} />
          <span className={`${styles.row} ${styles.rowShort}`} />
          <span className={styles.size} />
          <i
            className={styles.grip}
            role="slider"
            tabIndex={0}
            aria-label="Card size"
            aria-valuemin={120}
            aria-valuemax={220}
            aria-valuenow={size.w}
            onPointerDown={onDown}
            onPointerMove={onMove}
            onPointerUp={onUp}
            onPointerCancel={onUp}
            onKeyDown={onKey}
          />
        </div>
      </div>
      <button
        type="button"
        className={locked ? `${styles.lock} ${styles.isOn}` : styles.lock}
        aria-pressed={locked}
        onClick={(): void => setLocked(!locked)}
      >
        <span className={styles.ico} aria-hidden="true">
          <svg viewBox="0 0 256 256"><g fill="currentColor"><path d="M216 96v112a8 8 0 0 1-8 8H48a8 8 0 0 1-8-8V96a8 8 0 0 1 8-8h160a8 8 0 0 1 8 8" opacity=".2" /><path d="M208 80h-32V56a48 48 0 0 0-96 0v24H48a16 16 0 0 0-16 16v112a16 16 0 0 0 16 16h160a16 16 0 0 0 16-16V96a16 16 0 0 0-16-16M96 56a32 32 0 0 1 64 0v24H96Zm112 152H48V96h160z" /></g></svg>
        </span>
        Lock ratio
      </button>
    </div>
  );
}