06Drop-gap indicator reorder
Dragging the six-dot handle shows a highlighted empty gap line where the item will land, instead of just shoving siblings aside.
Best forReordering task priority, editing a playlist order
drop-indicator 엘리먼트pointermove 중간 인덱스 계산화살표 키보드 이동
<main class="stage">
<ul class="rd-list is-demo" aria-label="Priority list. On the handle, reorder with Alt+Up/Down">
<li class="rd-item" data-i="0">
<button class="rd-item__handle" type="button" aria-label="Reorder, up/down arrows">
<svg viewBox="0 0 256 256" aria-hidden="true"><g fill="currentColor"><path d="M208 32v192a16 16 0 0 1-16 16H64a16 16 0 0 1-16-16V32a16 16 0 0 1 16-16h128a16 16 0 0 1 16 16" opacity=".2"/><path d="M104 60a12 12 0 1 1-12-12a12 12 0 0 1 12 12m60 12a12 12 0 1 0-12-12a12 12 0 0 0 12 12m-72 44a12 12 0 1 0 12 12a12 12 0 0 0-12-12m72 0a12 12 0 1 0 12 12a12 12 0 0 0-12-12m-72 68a12 12 0 1 0 12 12a12 12 0 0 0-12-12m72 0a12 12 0 1 0 12 12a12 12 0 0 0-12-12"/></g></svg>
</button>
<span>Fix payment error</span>
</li>
<li class="rd-drop-indicator" aria-hidden="true"></li>
<li class="rd-item rd-item--lifted" data-i="1">
<button class="rd-item__handle" type="button" aria-label="Reorder, up/down arrows">
<svg viewBox="0 0 256 256" aria-hidden="true"><g fill="currentColor"><path d="M208 32v192a16 16 0 0 1-16 16H64a16 16 0 0 1-16-16V32a16 16 0 0 1 16-16h128a16 16 0 0 1 16 16" opacity=".2"/><path d="M104 60a12 12 0 1 1-12-12a12 12 0 0 1 12 12m60 12a12 12 0 1 0-12-12a12 12 0 0 0 12 12m-72 44a12 12 0 1 0 12 12a12 12 0 0 0-12-12m72 0a12 12 0 1 0 12 12a12 12 0 0 0-12-12m-72 68a12 12 0 1 0 12 12a12 12 0 0 0-12-12m72 0a12 12 0 1 0 12 12a12 12 0 0 0-12-12"/></g></svg>
</button>
<span>Login page QA</span>
</li>
<li class="rd-item" data-i="2">
<button class="rd-item__handle" type="button" aria-label="Reorder, up/down arrows">
<svg viewBox="0 0 256 256" aria-hidden="true"><g fill="currentColor"><path d="M208 32v192a16 16 0 0 1-16 16H64a16 16 0 0 1-16-16V32a16 16 0 0 1 16-16h128a16 16 0 0 1 16 16" opacity=".2"/><path d="M104 60a12 12 0 1 1-12-12a12 12 0 0 1 12 12m60 12a12 12 0 1 0-12-12a12 12 0 0 0 12 12m-72 44a12 12 0 1 0 12 12a12 12 0 0 0-12-12m72 0a12 12 0 1 0 12 12a12 12 0 0 0-12-12m-72 68a12 12 0 1 0 12 12a12 12 0 0 0-12-12m72 0a12 12 0 1 0 12 12a12 12 0 0 0-12-12"/></g></svg>
</button>
<span>Organize deploy docs</span>
</li>
</ul>
</main>@use "../../../../site/static/demo-tokens" as *;
$duration: $dur-base; // 들어올림·이동 시간
$easing: $ease-spring;
$color: $subject-blue; // 드롭 인디케이터 색
@include stage($stage-ink);
.rd-list {
list-style: none;
margin: 0;
padding: 0;
width: min(260px, 82vw);
display: flex;
flex-direction: column;
}
.rd-item {
display: flex;
align-items: center;
gap: $sp-2;
padding: $sp-3 $sp-4;
margin: $sp-1 0;
border-radius: $r-sm;
background: $stage-paper;
transition: transform $duration $easing, box-shadow $duration $easing;
}
.rd-item span { font-size: 13px; color: $stage-ink; }
.rd-item.is-dragging {
position: relative;
z-index: 2;
box-shadow: $shadow-raised;
transition: none;
cursor: grabbing;
}
.rd-item__handle {
width: 24px;
height: 24px;
display: grid;
place-items: center;
border: 0;
background: none;
color: rgba(23, 20, 26, .5);
cursor: grab;
flex: 0 0 auto;
touch-action: none;
}
.rd-item__handle svg { width: 14px; height: 14px; }
.rd-item__handle:focus-visible { outline: 2px solid $color; outline-offset: 2px; border-radius: $r-xs; }
.rd-drop-indicator {
height: 0;
margin: 0 $sp-4;
border-radius: $r-xs;
background: $color;
opacity: 0;
transition: height $duration $easing, opacity $duration $easing;
}
.rd-list.is-dragging .rd-drop-indicator { height: 8px; opacity: 1; }
// 데모 강제 루프 — 가운데 항목이 들리고, 그 아래 자리에 드롭 인디케이터가 나타났다 정리되는 흐름
.rd-list.is-demo .rd-item--lifted {
animation: rd-lift-loop $dur-loop $easing infinite;
}
.rd-list.is-demo .rd-drop-indicator {
animation: rd-gap-loop $dur-loop $easing infinite;
}
@keyframes rd-lift-loop {
0%, 10% { transform: translateY(0) scale(1); box-shadow: none; }
40%, 65% { transform: translateY(52px) scale(1.03); box-shadow: $shadow-raised; }
95%, 100% { transform: translateY(0) scale(1); box-shadow: none; }
}
@keyframes rd-gap-loop {
0%, 10% { height: 0; opacity: 0; }
40%, 65% { height: 8px; opacity: 1; }
95%, 100% { height: 0; opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
.rd-item, .rd-drop-indicator { transition: none; }
}html, body {
margin: 0;
overflow: hidden;
}
.stage {
box-sizing: border-box;
min-height: 100vh;
display: grid;
place-items: center;
margin: 0;
background: #17141a;
font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
padding: clamp(8px, 4vw, 24px);
}
.rd-list {
list-style: none;
margin: 0;
padding: 0;
width: min(260px, 82vw);
display: flex;
flex-direction: column;
}
.rd-item {
display: flex;
align-items: center;
gap: 8px;
padding: 12px 16px;
margin: 4px 0;
border-radius: 8px;
background: #ffffff;
transition: transform 300ms cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
.rd-item span {
font-size: 13px;
color: #17141a;
}
.rd-item.is-dragging {
position: relative;
z-index: 2;
box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
transition: none;
cursor: grabbing;
}
.rd-item__handle {
width: 24px;
height: 24px;
display: grid;
place-items: center;
border: 0;
background: none;
color: rgba(23, 20, 26, 0.5);
cursor: grab;
flex: 0 0 auto;
touch-action: none;
}
.rd-item__handle svg {
width: 14px;
height: 14px;
}
.rd-item__handle:focus-visible {
outline: 2px solid #2f6df6;
outline-offset: 2px;
border-radius: 4px;
}
.rd-drop-indicator {
height: 0;
margin: 0 16px;
border-radius: 4px;
background: #2f6df6;
opacity: 0;
transition: height 300ms cubic-bezier(0.2, 0.8, 0.2, 1), opacity 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
.rd-list.is-dragging .rd-drop-indicator {
height: 8px;
opacity: 1;
}
.rd-list.is-demo .rd-item--lifted {
animation: rd-lift-loop 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}
.rd-list.is-demo .rd-drop-indicator {
animation: rd-gap-loop 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}
@keyframes rd-lift-loop {
0%, 10% {
transform: translateY(0) scale(1);
box-shadow: none;
}
40%, 65% {
transform: translateY(52px) scale(1.03);
box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}
95%, 100% {
transform: translateY(0) scale(1);
box-shadow: none;
}
}
@keyframes rd-gap-loop {
0%, 10% {
height: 0;
opacity: 0;
}
40%, 65% {
height: 8px;
opacity: 1;
}
95%, 100% {
height: 0;
opacity: 0;
}
}
@media (prefers-reduced-motion: reduce) {
.rd-item, .rd-drop-indicator {
transition: none;
}
}(function () {
var list = document.querySelector('.rd-list');
var indicator = list.querySelector('.rd-drop-indicator');
function order() { return Array.prototype.slice.call(list.querySelectorAll('.rd-item')); }
order().forEach(function (item) {
var handle = item.querySelector('.rd-item__handle');
var dragging = false, startY = 0;
handle.addEventListener('pointerdown', function (e) {
list.classList.remove('is-demo');
dragging = true;
startY = e.clientY;
item.classList.add('is-dragging');
list.classList.add('is-dragging');
handle.setPointerCapture(e.pointerId);
});
handle.addEventListener('pointermove', function (e) {
if (!dragging) return;
item.style.transform = 'translateY(' + (e.clientY - startY) + 'px)';
var rest = order().filter(function (r) { return r !== item; });
var target = rest.filter(function (r) {
var rect = r.getBoundingClientRect();
return e.clientY < rect.top + rect.height / 2;
})[0];
if (target) list.insertBefore(indicator, target);
else list.insertBefore(indicator, null);
});
function drop() {
if (!dragging) return;
dragging = false;
item.style.transform = '';
item.classList.remove('is-dragging');
list.classList.remove('is-dragging');
list.insertBefore(item, indicator);
}
handle.addEventListener('pointerup', drop);
handle.addEventListener('pointercancel', drop);
handle.addEventListener('keydown', function (e) {
if ((e.key !== 'ArrowUp' && e.key !== 'ArrowDown') || !e.altKey) return;
e.preventDefault();
list.classList.remove('is-demo');
var o = order();
var idx = o.indexOf(item);
var targetIdx = e.key === 'ArrowUp' ? idx - 1 : idx + 1;
if (targetIdx < 0 || targetIdx >= o.length) return;
if (e.key === 'ArrowUp') list.insertBefore(item, o[targetIdx]);
else list.insertBefore(item, o[targetIdx].nextSibling);
handle.focus({ preventScroll: true });
});
});
})();import { useRef, useState, type CSSProperties } from "react";
import styles from "./ReorderIndicatorDropGap.module.scss";
export type ReorderIndicatorDropGapProps = {
items: string[];
/** 들어올림·이동 시간 (기본 300ms) */
duration?: number;
easing?: string;
/** 드롭 인디케이터 색 */
color?: string;
};
type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
/**
* 손잡이를 드래그하면 항목이 통째로 밀리는 대신 놓일 자리에 빈 줄 인디케이터가 먼저 나타난다.
* 마우스를 못 쓰는 사람은 손잡이 포커스 후 Alt+화살표로 같은 순서 변경을 할 수 있다.
*/
export default function ReorderIndicatorDropGap({
items,
duration = 300,
easing = "cubic-bezier(.2,.8,.2,1)",
color = "#2f6df6",
}: ReorderIndicatorDropGapProps) {
const [order, setOrder] = useState(items);
const [dragIdx, setDragIdx] = useState<number | null>(null);
const [dragY, setDragY] = useState(0);
const [dropIdx, setDropIdx] = useState<number | null>(null);
const rowRefs = useRef<Array<HTMLLIElement | null>>([]);
const startY = useRef(0);
const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
const move = (i: number, dir: -1 | 1) => {
const j = i + dir;
if (j < 0 || j >= order.length) return;
const next = order.slice();
[next[i], next[j]] = [next[j], next[i]];
setOrder(next);
};
const down = (i: number, e: any) => {
setDragIdx(i);
setDropIdx(i);
startY.current = e.clientY;
e.currentTarget.setPointerCapture(e.pointerId);
};
const dragMove = (e: any) => {
if (dragIdx === null) return;
setDragY(e.clientY - (startY.current ?? e.clientY));
let target = order.length;
const refs = rowRefs.current ?? [];
for (let k = 0; k < order.length; k++) {
const el = refs[k];
if (!el || k === dragIdx) continue;
const rect = el.getBoundingClientRect();
if (e.clientY < rect.top + rect.height / 2) { target = k; break; }
}
setDropIdx(target);
};
const drop = () => {
if (dragIdx === null || dropIdx === null) { setDragIdx(null); return; }
const next = order.slice();
const [moved] = next.splice(dragIdx, 1);
next.splice(dropIdx > dragIdx ? dropIdx - 1 : dropIdx, 0, moved);
setOrder(next);
setDragIdx(null); setDropIdx(null); setDragY(0);
};
const rows = order.flatMap((label, i) => {
const nodes = [];
if (dropIdx === i && dragIdx !== null) {
nodes.push(<li key={`gap-${label}`} className={styles.indicator} aria-hidden="true" />);
}
nodes.push(
<li
key={label}
ref={(el: HTMLLIElement | null) => { if (rowRefs.current) rowRefs.current[i] = el; }}
className={`${styles.item} ${dragIdx === i ? styles.dragging : ""}`}
style={dragIdx === i ? { transform: `translateY(${dragY}px)` } : undefined}
>
<button
className={styles.handle}
type="button"
aria-label="순서 변경, 위/아래 화살표"
onPointerDown={(e: any) => down(i, e)}
onPointerMove={dragMove}
onPointerUp={drop}
onPointerCancel={drop}
onKeyDown={(e: any) => {
if ((e.key === "ArrowUp" || e.key === "ArrowDown") && e.altKey) {
e.preventDefault();
move(i, e.key === "ArrowUp" ? -1 : 1);
}
}}
>
<svg viewBox="0 0 256 256" aria-hidden="true"><g fill="currentColor"><path d="M208 32v192a16 16 0 0 1-16 16H64a16 16 0 0 1-16-16V32a16 16 0 0 1 16-16h128a16 16 0 0 1 16 16" opacity=".2" /><path d="M104 60a12 12 0 1 1-12-12a12 12 0 0 1 12 12m60 12a12 12 0 1 0-12-12a12 12 0 0 0 12 12m-72 44a12 12 0 1 0 12 12a12 12 0 0 0-12-12m72 0a12 12 0 1 0 12 12a12 12 0 0 0-12-12m-72 68a12 12 0 1 0 12 12a12 12 0 0 0-12-12m72 0a12 12 0 1 0 12 12a12 12 0 0 0-12-12" /></g></svg>
</button>
<span>{label}</span>
</li>
);
return nodes;
});
return (
<ul className={styles.list} style={vars} aria-label="우선순위 목록. 손잡이에서 화살표 키(Alt+위/아래)로 순서 변경">
{rows}
{dropIdx === order.length && dragIdx !== null && <li className={styles.indicator} aria-hidden="true" />}
</ul>
);
}06 Drop-gap indicator reorder — Measured area 19.851% · moving frames 16/23Original by GODRICH · SCSS and React ship in the zip · 9 Accordion List UI Patterns (Copy-Paste)
The post this demo lives in
9 Accordion List UI Patterns (Copy-Paste)An accordion list is a UI where clicking a row grows its height in place to reveal detail content. Here are nine working See all demos in this post
