08A Button That Reports a Failed Send With a Fading Shake and Turns Into Retry
It computes the horizontal offset as a sine wave inside an exponential decay, so the shake starts wide and narrows, while the color switches to a warning tone and settles into a Retry state.
Best forNetwork errors and missing-field alerts
SHAKE_AMP_PXSHAKE_DECAYSHAKE_HZ
<main class="stage">
<div class="sb is-demo" id="sb">
<div class="sb__scene" data-role="scene">
<div class="sh__bar" data-role="bar">
<span class="sh__text">Sending the meeting notes</span>
<button class="sh__send" data-role="send" type="button" aria-label="Send message"><svg xmlns="http://www.w3.org/2000/svg" class="sh__icon" data-role="icon-send" aria-hidden="true" focusable="false" viewBox="0 0 256 256"><g fill="currentColor"><path d="M227.91 134.86L59.93 231a8 8 0 0 1-11.44-9.67L80 128L48.49 34.72a8 8 0 0 1 11.44-9.67l168 95.85a8 8 0 0 1-.02 13.96" opacity=".2"/><path d="m231.87 114l-168-95.89a16 16 0 0 0-22.95 19.23L71.55 128l-30.63 90.67A16 16 0 0 0 56 240a16.15 16.15 0 0 0 7.93-2.1l167.92-96.05a16 16 0 0 0 .05-27.89ZM56 224a.6.6 0 0 0 0-.12L85.74 136H144a8 8 0 0 0 0-16H85.74L56.06 32.16A.5.5 0 0 0 56 32l168 95.83Z"/></g></svg><svg xmlns="http://www.w3.org/2000/svg" class="sh__icon" data-role="icon-retry" aria-hidden="true" focusable="false" viewBox="0 0 256 256"><g fill="currentColor"><path d="M216 128a88 88 0 1 1-88-88a88 88 0 0 1 88 88" opacity=".2"/><path d="M240 56v48a8 8 0 0 1-8 8h-48a8 8 0 0 1 0-16h27.4l-26.59-24.36l-.25-.24a80 80 0 1 0-1.67 114.78a8 8 0 0 1 11 11.63A95.44 95.44 0 0 1 128 224h-1.32a96 96 0 1 1 69.07-164L224 85.8V56a8 8 0 1 1 16 0"/></g></svg></button>
</div>
<p class="sh__note" data-role="note">Could not send</p>
<p class="sb__status sb__status--top" data-role="status" aria-live="off">Ready to send</p>
</div>
</div>
</main>@use "../../../../site/static/demo-tokens" as *;
@include stage($stage-ink);
.sb {
position: relative;
width: min(92vw, calc(160vh - 12.8vw));
aspect-ratio: 480 / 300;
margin: 0 auto;
border-radius: $r-card;
overflow: hidden;
box-shadow: $shadow-raised;
}
// 장면 판 — 480×300 좌표로 짜 두고 스크립트가 상자 폭에 맞춰 scale 한다.
// 기준점이 왼쪽 위 모서리인 이유: 판이 상자 왼쪽 위에 붙어 있어 모서리 기준으로 줄여야 줄인 판이 상자와 겹친다
.sb__scene {
position: absolute;
left: 0;
top: 0;
width: 480px;
height: 300px;
transform-origin: 0 0;
}
.sb__canvas {
position: absolute;
left: 0;
top: 0;
width: 480px;
height: 300px;
pointer-events: none;
}
.sb__status {
position: absolute;
left: $sp-4;
bottom: $sp-3;
box-sizing: border-box;
max-width: 260px;
margin: 0;
padding: $sp-1 $sp-3;
border-radius: $r-pill;
background: rgba(255, 255, 255, .9);
color: $subject-ink;
font-weight: 500;
font-size: 12px;
line-height: 1.4;
pointer-events: none;
}
.sb__status--top {
top: $sp-3;
bottom: auto;
}
.sb__status--side {
max-width: 140px;
border-radius: $r-control;
}
.sb { background: #f4eef6; }
.sh__bar {
position: absolute;
left: 72px;
top: 124px;
width: 336px;
height: 56px;
box-sizing: border-box;
padding: 0 $sp-2 0 $sp-5;
border-radius: $r-pill;
background: #ffffff;
box-shadow: inset 0 0 0 2px rgba(23, 20, 26, .08), 0 8px 18px rgba(23, 20, 26, .08);
display: flex;
align-items: center;
gap: $sp-3;
}
.sh__bar.is-fail { box-shadow: inset 0 0 0 2px #f0c4bc, 0 8px 18px rgba(240, 196, 188, .5); }
.sh__bar.is-ok { box-shadow: inset 0 0 0 2px #a9e3cf, 0 8px 18px rgba(23, 20, 26, .08); }
.sh__text {
flex: 1 1 auto;
min-width: 0;
overflow: hidden;
color: $subject-ink;
font-size: 14px;
line-height: 1.3;
white-space: nowrap;
text-overflow: ellipsis;
}
.sh__send {
position: relative;
flex: none;
width: 44px;
height: 44px;
margin: 0;
padding: 0;
border: 0;
border-radius: 50%;
background: #c8b8ff;
color: $subject-ink;
cursor: pointer;
}
.sh__bar.is-fail .sh__send {
background: $error-soft;
color: $error;
}
.sh__bar.is-ok .sh__send { background: #b4ecd9; }
.sh__send:focus-visible {
outline: 3px solid $subject-ink;
outline-offset: 3px;
}
.sh__icon {
position: absolute;
left: 11px;
top: 11px;
width: 22px;
height: 22px;
}
.sh__note {
position: absolute;
left: 96px;
top: 192px;
margin: 0;
color: $error;
font-weight: 700;
font-size: 13px;
line-height: 1.4;
}
@media (max-width: 340px) {
// 이 폭에서는 장면이 0.6 배 남짓으로 줄어든다 — 상태 줄 글자를 키워 줄인 뒤에도 읽히게 한다
.sb__status { font-size: 16px; }
}
@media (prefers-reduced-motion: reduce) {
// 움직임은 전부 스크립트가 그리고, 스크립트는 reduce 에서 루프를 돌리지 않고 결과 상태만 둔다. CSS 쪽 전환도 막아 둔다
.sb__scene * {
transition: none !important;
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: #17141a;
font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
padding: clamp(8px, 4vw, 24px);
}
.sb {
position: relative;
width: min(92vw, 160vh - 12.8vw);
aspect-ratio: 480/300;
margin: 0 auto;
border-radius: 16px;
overflow: hidden;
box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}
.sb__scene {
position: absolute;
left: 0;
top: 0;
width: 480px;
height: 300px;
transform-origin: 0 0;
}
.sb__canvas {
position: absolute;
left: 0;
top: 0;
width: 480px;
height: 300px;
pointer-events: none;
}
.sb__status {
position: absolute;
left: 16px;
bottom: 12px;
box-sizing: border-box;
max-width: 260px;
margin: 0;
padding: 4px 12px;
border-radius: 999px;
background: rgba(255, 255, 255, 0.9);
color: #17141a;
font-weight: 500;
font-size: 12px;
line-height: 1.4;
pointer-events: none;
}
.sb__status--top {
top: 12px;
bottom: auto;
}
.sb__status--side {
max-width: 140px;
border-radius: 12px;
}
.sb {
background: #f4eef6;
}
.sh__bar {
position: absolute;
left: 72px;
top: 124px;
width: 336px;
height: 56px;
box-sizing: border-box;
padding: 0 8px 0 20px;
border-radius: 999px;
background: #ffffff;
box-shadow: inset 0 0 0 2px rgba(23, 20, 26, 0.08), 0 8px 18px rgba(23, 20, 26, 0.08);
display: flex;
align-items: center;
gap: 12px;
}
.sh__bar.is-fail {
box-shadow: inset 0 0 0 2px #f0c4bc, 0 8px 18px rgba(240, 196, 188, 0.5);
}
.sh__bar.is-ok {
box-shadow: inset 0 0 0 2px #a9e3cf, 0 8px 18px rgba(23, 20, 26, 0.08);
}
.sh__text {
flex: 1 1 auto;
min-width: 0;
overflow: hidden;
color: #17141a;
font-size: 14px;
line-height: 1.3;
white-space: nowrap;
text-overflow: ellipsis;
}
.sh__send {
position: relative;
flex: none;
width: 44px;
height: 44px;
margin: 0;
padding: 0;
border: 0;
border-radius: 50%;
background: #c8b8ff;
color: #17141a;
cursor: pointer;
}
.sh__bar.is-fail .sh__send {
background: #ffe0d8;
color: #c2361a;
}
.sh__bar.is-ok .sh__send {
background: #b4ecd9;
}
.sh__send:focus-visible {
outline: 3px solid #17141a;
outline-offset: 3px;
}
.sh__icon {
position: absolute;
left: 11px;
top: 11px;
width: 22px;
height: 22px;
}
.sh__note {
position: absolute;
left: 96px;
top: 192px;
margin: 0;
color: #c2361a;
font-weight: 700;
font-size: 13px;
line-height: 1.4;
}
@media (max-width: 340px) {
.sb__status {
font-size: 16px;
}
}
@media (prefers-reduced-motion: reduce) {
.sb__scene * {
transition: none !important;
animation: none !important;
}
}(function () {
const root = document.getElementById("sb");
if (!root) return;
const W = 480;
const H = 300;
const FIXED_DT = 16;
// 파스텔 팔레트 — 캔버스와 스크립트가 칠하는 색은 여기서만 고른다 (scss 쪽 색은 demo-tokens)
const INK = [38, 33, 52];
const PAPER = [255, 252, 246];
const CREAM = [255, 243, 224];
const SKY = [158, 208, 255];
const LILAC = [200, 184, 255];
const MINT = [156, 228, 204];
const PINK = [255, 182, 204];
const PEACH = [255, 214, 184];
function clamp(v, lo, hi) { return v < lo ? lo : (v > hi ? hi : v); }
function lerp(a, b, t) { return a + (b - a) * t; }
function easeOut(x) { const c = clamp(x, 0, 1); return 1 - Math.pow(1 - c, 3); }
function easeInOut(x) {
const c = clamp(x, 0, 1);
return c < 0.5 ? 4 * c * c * c : 1 - Math.pow(-2 * c + 2, 3) / 2;
}
function rgba(c, a) {
return 'rgba(' + Math.round(c[0]) + ',' + Math.round(c[1]) + ',' + Math.round(c[2]) + ',' + clamp(a, 0, 1).toFixed(3) + ')';
}
function mix(a, b, t) { return [lerp(a[0], b[0], t), lerp(a[1], b[1], t), lerp(a[2], b[2], t)]; }
// 시드 고정 난수 — 같은 시드면 같은 값이 다시 나온다 (32비트 정수 섞기)
function makeRng(seed) {
let s = seed >>> 0;
return function () {
s = (s + 0x6d2b79f5) >>> 0;
let t = s;
t = Math.imul(t ^ (t >>> 15), t | 1);
t ^= t + Math.imul(t ^ (t >>> 7), t | 61);
return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
};
}
const sceneEl = root.querySelector('[data-role="scene"]');
const statusEl = root.querySelector('[data-role="status"]');
if (!sceneEl || !statusEl) {
return;
}
const scene = sceneEl;
const status = statusEl;
const reduceQuery = window.matchMedia('(prefers-reduced-motion: reduce)');
const still = reduceQuery.matches;
const resizeHooks = [];
// 자동 시연 중인가 — 사람이 처음 만지는 순간 시연을 멈추고 처음 상태로 돌린 뒤 상태 줄을 읽어 주기 시작한다
let demo = root.classList.contains('is-demo');
function wake() {
if (!demo) {
return;
}
demo = false;
root.classList.remove('is-demo');
status.setAttribute('aria-live', 'polite');
resetIdle();
}
function say(text) {
if (status.textContent !== text) {
status.textContent = text;
}
}
// 장면 배율 — 480×300 좌표로 짠 판을 상자 폭에 맞춰 통째로 줄인다
let k = 1;
function fitScene() {
const w = root.clientWidth;
k = w > 0 ? w / W : 1;
scene.style.transform = 'scale(' + k.toFixed(4) + ')';
}
// 화면 좌표(CSS px) → 장면 좌표(480×300). 줄인 배율 k 로 나눠야 판 안의 위치가 된다
function toScene(clientX, clientY) {
const r = root.getBoundingClientRect();
return [(clientX - r.left) / k, (clientY - r.top) / k];
}
// 캡처 단계에서 듣는다 — 버튼 자신의 pointerdown 보다 먼저 시연을 끝내야 사람의 첫 누름이 처음 상태에서 시작한다
root.addEventListener('pointerdown', wake, true);
root.addEventListener('keydown', wake, true);
// 감쇠 스프링 한 걸음 — 질량 1, 강성 stiff, 감쇠비 zeta. 속도를 먼저 바꾸고 그 속도로 위치를 옮긴다(반암시적 오일러)
function springStep(s, stiff, zeta, dtMs) {
const dt = dtMs / 1000;
const c = 2 * zeta * Math.sqrt(stiff);
const a = -stiff * (s.x - s.target) - c * s.v;
s.v += a * dt;
s.x += s.v * dt;
}
// 처음 흔들림 폭(px)
const SHAKE_AMP_PX = 12;
// 지수 감쇠율(1/s) — 폭이 반으로 줄어드는 시간 = ln2 / SHAKE_DECAY
const SHAKE_DECAY = 6;
// 초당 왕복 수
const SHAKE_HZ = 8;
// 흔들림이 끝났다고 보는 폭(px) — 이 밑으로 줄어드는 시각까지만 흔든다
const SHAKE_REST_PX = 0.3;
const SHAKE_MS = Math.ceil(Math.log(SHAKE_AMP_PX / SHAKE_REST_PX) / SHAKE_DECAY * 1000);
// Send 버튼은 입력줄에 스프링으로 매달려 한 발 늦게 따라온다 — 강성을 낮추면 따라오지 못하고 제자리에 남는다
const LAG_K = 3600;
const LAG_ZETA = 0.5;
const SEND_MS = 420;
const DEMO_CYCLE = 3200;
const DEMO_RETRY_AT = 1400;
const TXT_READY = 'Ready to send';
const TXT_SENDING = 'Sending';
const TXT_FAIL = 'Send failed — press Retry';
const TXT_DONE = 'Sent — the retry went through';
const TXT_ARIA_SEND = 'Send message';
const TXT_ARIA_RETRY = 'Retry';
const TXT_ARIA_SENT = 'Sent';
const barEl = root.querySelector('[data-role="bar"]');
const sendEl = root.querySelector('[data-role="send"]');
const noteEl = root.querySelector('[data-role="note"]');
const iconSendEl = root.querySelector('[data-role="icon-send"]');
const iconRetryEl = root.querySelector('[data-role="icon-retry"]');
if (!barEl || !sendEl || !noteEl || !iconSendEl || !iconRetryEl) {
return;
}
const bar = barEl;
const send = sendEl;
const note = noteEl;
const iconSend = iconSendEl;
const iconRetry = iconRetryEl;
const lag = { x: 0, v: 0, target: 0 };
let phase = 'idle';
let pt = 0;
let attempt = 0;
let demoStart = -1;
let retryDone = false;
// 흔들림 식 — 사인파를 지수로 줄어드는 봉투 안에 넣는다. tau 는 초
function shakeOffset(tau) {
return SHAKE_AMP_PX * Math.exp(-SHAKE_DECAY * tau) * Math.sin(2 * Math.PI * SHAKE_HZ * tau);
}
function shakeEnvelope(tau) { return Math.exp(-SHAKE_DECAY * tau); }
function setState(cls, aria) {
bar.classList.remove('is-fail', 'is-ok');
if (cls) {
bar.classList.add(cls);
}
send.setAttribute('aria-label', aria);
const retry = cls === 'is-fail';
iconSend.style.opacity = retry ? '0' : '';
iconRetry.style.opacity = retry ? '' : '0';
}
function resetIdle() {
phase = 'idle';
pt = 0;
attempt = 0;
lag.x = 0;
lag.v = 0;
lag.target = 0;
setState('', TXT_ARIA_SEND);
note.style.opacity = '0';
bar.style.transform = '';
send.style.transform = '';
say(TXT_READY);
}
function fail() {
setState('is-fail', TXT_ARIA_RETRY);
note.style.opacity = '';
say(TXT_FAIL);
}
function succeed() {
phase = 'done';
pt = 0;
setState('is-ok', TXT_ARIA_SENT);
note.style.opacity = '0';
say(TXT_DONE);
}
function settle() {
resetIdle();
attempt = 1;
phase = 'failed';
fail();
}
function press() {
if (phase === 'sending' || phase === 'shake') {
return;
}
if (phase === 'done') {
resetIdle();
return;
}
attempt += 1;
if (still) {
// 줄인 움직임 — 흔들지 않고 결과 상태로 바로 간다
if (attempt === 1) {
phase = 'failed';
fail();
}
else {
succeed();
}
return;
}
phase = 'sending';
pt = 0;
say(TXT_SENDING);
}
function step() {
if (phase === 'sending') {
pt += FIXED_DT;
if (pt >= SEND_MS) {
pt = 0;
// 첫 시도는 실패, 다시 보내기는 성공 — 실패 화면을 보여 주는 시연 순서
if (attempt === 1) {
phase = 'shake';
fail();
}
else {
succeed();
}
}
}
else if (phase === 'shake') {
pt += FIXED_DT;
if (pt >= SHAKE_MS) {
phase = 'failed';
pt = 0;
}
}
lag.target = phase === 'shake' ? shakeOffset(pt / 1000) : 0;
springStep(lag, LAG_K, LAG_ZETA, FIXED_DT);
}
function demoTick(t) {
// 첫 시연은 200ms 뒤에 — 렌더 하네스가 로드 직후를 따로 재는 구간을 비운다
if (t < 200) {
return;
}
if (demoStart < 0 || t - demoStart >= DEMO_CYCLE) {
demoStart = t;
retryDone = false;
resetIdle();
press();
}
else if (!retryDone && t - demoStart >= DEMO_RETRY_AT) {
retryDone = true;
press();
}
}
function draw() {
const x = phase === 'shake' ? shakeOffset(pt / 1000) : 0;
// 기울기도 같은 값에서 — 밀린 쪽으로 x × 0.12° 만큼 고개를 돌린다
bar.style.transform = x === 0 ? '' : 'translateX(' + x.toFixed(2) + 'px) rotate(' + (x * 0.12).toFixed(2) + 'deg)';
let nudge = 0;
if (phase === 'sending') {
nudge = Math.sin(Math.PI * pt / SEND_MS) * 6;
}
const rel = lag.x - x + nudge;
send.style.transform = Math.abs(rel) < 0.01 ? '' : 'translateX(' + rel.toFixed(2) + 'px)';
if (phase === 'shake') {
note.style.opacity = clamp(1 - shakeEnvelope(pt / 1000) * 0.6, 0, 1).toFixed(3);
}
}
send.addEventListener('click', function () { press(); });
resetIdle();
let rafId = 0;
let lastTs = -1;
let acc = 0;
let clock = 0;
function onResize() {
fitScene();
for (const f of resizeHooks) {
f();
}
draw();
}
fitScene();
window.addEventListener('resize', onResize);
function frame(ts) {
if (lastTs < 0) {
lastTs = ts;
}
// 탭이 숨었다 돌아와도 한 번에 100ms 까지만 따라잡는다 — 순간이동 대신 이어서 움직인다
acc += Math.min(ts - lastTs, 100);
lastTs = ts;
let n = 0;
while (acc >= FIXED_DT && n < 6) {
clock += FIXED_DT;
if (demo) {
demoTick(clock);
}
step();
acc -= FIXED_DT;
n += 1;
}
draw();
rafId = window.requestAnimationFrame(frame);
}
if (still) {
settle();
draw();
}
else {
rafId = window.requestAnimationFrame(frame);
}
return function () {
window.cancelAnimationFrame(rafId);
window.removeEventListener('resize', onResize);
};
})();// SendFailDampedShake - vanilla 판(08-send-btn-fail-damped-shake) 의 React 포트. 같은 계산을 useEffect 안에서 돌린다.
import { useEffect, useRef } from "react";
import styles from "./SendFailDampedShake.module.scss";
const cx = (s: string): string => s.split(" ").map((n) => styles[n] ?? n).join(" ");
export default function SendFailDampedShake() {
const rootRef = useRef<HTMLDivElement | null>(null);
useEffect(() => {
const rootEl = rootRef.current;
if (!rootEl) return;
const root: HTMLElement = rootEl;
type RGB = [number, number, number];
const W = 480;
const H = 300;
const FIXED_DT = 16;
// 파스텔 팔레트 — 캔버스와 스크립트가 칠하는 색은 여기서만 고른다 (scss 쪽 색은 demo-tokens)
const INK: RGB = [38, 33, 52];
const PAPER: RGB = [255, 252, 246];
const CREAM: RGB = [255, 243, 224];
const SKY: RGB = [158, 208, 255];
const LILAC: RGB = [200, 184, 255];
const MINT: RGB = [156, 228, 204];
const PINK: RGB = [255, 182, 204];
const PEACH: RGB = [255, 214, 184];
function clamp(v: number, lo: number, hi: number): number { return v < lo ? lo : (v > hi ? hi : v); }
function lerp(a: number, b: number, t: number): number { return a + (b - a) * t; }
function easeOut(x: number): number { const c = clamp(x, 0, 1); return 1 - Math.pow(1 - c, 3); }
function easeInOut(x: number): number {
const c = clamp(x, 0, 1);
return c < 0.5 ? 4 * c * c * c : 1 - Math.pow(-2 * c + 2, 3) / 2;
}
function rgba(c: RGB, a: number): string {
return 'rgba(' + Math.round(c[0]) + ',' + Math.round(c[1]) + ',' + Math.round(c[2]) + ',' + clamp(a, 0, 1).toFixed(3) + ')';
}
function mix(a: RGB, b: RGB, t: number): RGB { return [lerp(a[0], b[0], t), lerp(a[1], b[1], t), lerp(a[2], b[2], t)]; }
// 시드 고정 난수 — 같은 시드면 같은 값이 다시 나온다 (32비트 정수 섞기)
function makeRng(seed: number): () => number {
let s = seed >>> 0;
return function (): number {
s = (s + 0x6d2b79f5) >>> 0;
let t = s;
t = Math.imul(t ^ (t >>> 15), t | 1);
t ^= t + Math.imul(t ^ (t >>> 7), t | 61);
return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
};
}
const sceneEl = root.querySelector('[data-role="scene"]') as HTMLElement | null;
const statusEl = root.querySelector('[data-role="status"]') as HTMLElement | null;
if (!sceneEl || !statusEl) { return; }
const scene: HTMLElement = sceneEl;
const status: HTMLElement = statusEl;
const reduceQuery = window.matchMedia('(prefers-reduced-motion: reduce)');
const still = reduceQuery.matches;
const resizeHooks: Array<() => void> = [];
// 자동 시연 중인가 — 사람이 처음 만지는 순간 시연을 멈추고 처음 상태로 돌린 뒤 상태 줄을 읽어 주기 시작한다
let demo = root.classList.contains('is-demo');
function wake(): void {
if (!demo) { return; }
demo = false;
root.classList.remove('is-demo');
status.setAttribute('aria-live', 'polite');
resetIdle();
}
function say(text: string): void {
if (status.textContent !== text) { status.textContent = text; }
}
// 장면 배율 — 480×300 좌표로 짠 판을 상자 폭에 맞춰 통째로 줄인다
let k = 1;
function fitScene(): void {
const w = root.clientWidth;
k = w > 0 ? w / W : 1;
scene.style.transform = 'scale(' + k.toFixed(4) + ')';
}
// 화면 좌표(CSS px) → 장면 좌표(480×300). 줄인 배율 k 로 나눠야 판 안의 위치가 된다
function toScene(clientX: number, clientY: number): [number, number] {
const r = root.getBoundingClientRect();
return [(clientX - r.left) / k, (clientY - r.top) / k];
}
// 캡처 단계에서 듣는다 — 버튼 자신의 pointerdown 보다 먼저 시연을 끝내야 사람의 첫 누름이 처음 상태에서 시작한다
root.addEventListener('pointerdown', wake, true);
root.addEventListener('keydown', wake, true);
type Spring = { x: number; v: number; target: number };
// 감쇠 스프링 한 걸음 — 질량 1, 강성 stiff, 감쇠비 zeta. 속도를 먼저 바꾸고 그 속도로 위치를 옮긴다(반암시적 오일러)
function springStep(s: Spring, stiff: number, zeta: number, dtMs: number): void {
const dt = dtMs / 1000;
const c = 2 * zeta * Math.sqrt(stiff);
const a = -stiff * (s.x - s.target) - c * s.v;
s.v += a * dt;
s.x += s.v * dt;
}
type Phase = 'idle' | 'sending' | 'shake' | 'failed' | 'done';
// 처음 흔들림 폭(px)
const SHAKE_AMP_PX = 12;
// 지수 감쇠율(1/s) — 폭이 반으로 줄어드는 시간 = ln2 / SHAKE_DECAY
const SHAKE_DECAY = 6;
// 초당 왕복 수
const SHAKE_HZ = 8;
// 흔들림이 끝났다고 보는 폭(px) — 이 밑으로 줄어드는 시각까지만 흔든다
const SHAKE_REST_PX = 0.3;
const SHAKE_MS = Math.ceil(Math.log(SHAKE_AMP_PX / SHAKE_REST_PX) / SHAKE_DECAY * 1000);
// 보내기 버튼은 입력줄에 스프링으로 매달려 한 발 늦게 따라온다 — 강성을 낮추면 따라오지 못하고 제자리에 남는다
const LAG_K = 3600;
const LAG_ZETA = 0.5;
const SEND_MS = 420;
const DEMO_CYCLE = 3200;
const DEMO_RETRY_AT = 1400;
const TXT_READY = '보낼 준비 됨';
const TXT_SENDING = '보내는 중';
const TXT_FAIL = '전송 실패 — 다시 보내기를 눌러 주세요';
const TXT_DONE = '보냄 — 다시 보내기에 성공했어요';
const TXT_ARIA_SEND = '메시지 보내기';
const TXT_ARIA_RETRY = '다시 보내기';
const TXT_ARIA_SENT = '보냄';
const barEl = root.querySelector('[data-role="bar"]') as HTMLElement | null;
const sendEl = root.querySelector('[data-role="send"]') as HTMLButtonElement | null;
const noteEl = root.querySelector('[data-role="note"]') as HTMLElement | null;
const iconSendEl = root.querySelector('[data-role="icon-send"]') as SVGElement | null;
const iconRetryEl = root.querySelector('[data-role="icon-retry"]') as SVGElement | null;
if (!barEl || !sendEl || !noteEl || !iconSendEl || !iconRetryEl) { return; }
const bar: HTMLElement = barEl;
const send: HTMLButtonElement = sendEl;
const note: HTMLElement = noteEl;
const iconSend: SVGElement = iconSendEl;
const iconRetry: SVGElement = iconRetryEl;
const lag: Spring = { x: 0, v: 0, target: 0 };
let phase: Phase = 'idle';
let pt = 0;
let attempt = 0;
let demoStart = -1;
let retryDone = false;
// 흔들림 식 — 사인파를 지수로 줄어드는 봉투 안에 넣는다. tau 는 초
function shakeOffset(tau: number): number {
return SHAKE_AMP_PX * Math.exp(-SHAKE_DECAY * tau) * Math.sin(2 * Math.PI * SHAKE_HZ * tau);
}
function shakeEnvelope(tau: number): number { return Math.exp(-SHAKE_DECAY * tau); }
function setState(cls: string, aria: string): void {
bar.classList.remove('is-fail', 'is-ok');
if (cls) { bar.classList.add(cls); }
send.setAttribute('aria-label', aria);
const retry = cls === 'is-fail';
iconSend.style.opacity = retry ? '0' : '';
iconRetry.style.opacity = retry ? '' : '0';
}
function resetIdle(): void {
phase = 'idle';
pt = 0;
attempt = 0;
lag.x = 0;
lag.v = 0;
lag.target = 0;
setState('', TXT_ARIA_SEND);
note.style.opacity = '0';
bar.style.transform = '';
send.style.transform = '';
say(TXT_READY);
}
function fail(): void {
setState('is-fail', TXT_ARIA_RETRY);
note.style.opacity = '';
say(TXT_FAIL);
}
function succeed(): void {
phase = 'done';
pt = 0;
setState('is-ok', TXT_ARIA_SENT);
note.style.opacity = '0';
say(TXT_DONE);
}
function settle(): void {
resetIdle();
attempt = 1;
phase = 'failed';
fail();
}
function press(): void {
if (phase === 'sending' || phase === 'shake') { return; }
if (phase === 'done') { resetIdle(); return; }
attempt += 1;
if (still) {
// 줄인 움직임 — 흔들지 않고 결과 상태로 바로 간다
if (attempt === 1) { phase = 'failed'; fail(); } else { succeed(); }
return;
}
phase = 'sending';
pt = 0;
say(TXT_SENDING);
}
function step(): void {
if (phase === 'sending') {
pt += FIXED_DT;
if (pt >= SEND_MS) {
pt = 0;
// 첫 시도는 실패, 다시 보내기는 성공 — 실패 화면을 보여 주는 시연 순서
if (attempt === 1) { phase = 'shake'; fail(); } else { succeed(); }
}
} else if (phase === 'shake') {
pt += FIXED_DT;
if (pt >= SHAKE_MS) { phase = 'failed'; pt = 0; }
}
lag.target = phase === 'shake' ? shakeOffset(pt / 1000) : 0;
springStep(lag, LAG_K, LAG_ZETA, FIXED_DT);
}
function demoTick(t: number): void {
// 첫 시연은 200ms 뒤에 — 렌더 하네스가 로드 직후를 따로 재는 구간을 비운다
if (t < 200) { return; }
if (demoStart < 0 || t - demoStart >= DEMO_CYCLE) {
demoStart = t;
retryDone = false;
resetIdle();
press();
} else if (!retryDone && t - demoStart >= DEMO_RETRY_AT) {
retryDone = true;
press();
}
}
function draw(): void {
const x = phase === 'shake' ? shakeOffset(pt / 1000) : 0;
// 기울기도 같은 값에서 — 밀린 쪽으로 x × 0.12° 만큼 고개를 돌린다
bar.style.transform = x === 0 ? '' : 'translateX(' + x.toFixed(2) + 'px) rotate(' + (x * 0.12).toFixed(2) + 'deg)';
let nudge = 0;
if (phase === 'sending') { nudge = Math.sin(Math.PI * pt / SEND_MS) * 6; }
const rel = lag.x - x + nudge;
send.style.transform = Math.abs(rel) < 0.01 ? '' : 'translateX(' + rel.toFixed(2) + 'px)';
if (phase === 'shake') {
note.style.opacity = clamp(1 - shakeEnvelope(pt / 1000) * 0.6, 0, 1).toFixed(3);
}
}
send.addEventListener('click', function (): void { press(); });
resetIdle();
let rafId = 0;
let lastTs = -1;
let acc = 0;
let clock = 0;
function onResize(): void {
fitScene();
for (const f of resizeHooks) { f(); }
draw();
}
fitScene();
window.addEventListener('resize', onResize);
function frame(ts: number): void {
if (lastTs < 0) { lastTs = ts; }
// 탭이 숨었다 돌아와도 한 번에 100ms 까지만 따라잡는다 — 순간이동 대신 이어서 움직인다
acc += Math.min(ts - lastTs, 100);
lastTs = ts;
let n = 0;
while (acc >= FIXED_DT && n < 6) {
clock += FIXED_DT;
if (demo) { demoTick(clock); }
step();
acc -= FIXED_DT;
n += 1;
}
draw();
rafId = window.requestAnimationFrame(frame);
}
if (still) {
settle();
draw();
} else {
rafId = window.requestAnimationFrame(frame);
}
return function (): void {
window.cancelAnimationFrame(rafId);
window.removeEventListener('resize', onResize);
};
}, []);
return (
<div className={cx("sb") + " is-demo"} ref={rootRef}>
<div className={cx("sb__scene")} data-role="scene">
<div className={cx("sh__bar")} data-role="bar">
<span className={cx("sh__text")}>회의 자료 보내 드려요</span>
<button className={cx("sh__send")} data-role="send" type="button" aria-label="메시지 보내기"><svg xmlns="http://www.w3.org/2000/svg" className={cx("sh__icon")} data-role="icon-send" aria-hidden="true" focusable="false" viewBox="0 0 256 256"><g fill="currentColor"><path d="M227.91 134.86L59.93 231a8 8 0 0 1-11.44-9.67L80 128L48.49 34.72a8 8 0 0 1 11.44-9.67l168 95.85a8 8 0 0 1-.02 13.96" opacity=".2"/><path d="m231.87 114l-168-95.89a16 16 0 0 0-22.95 19.23L71.55 128l-30.63 90.67A16 16 0 0 0 56 240a16.15 16.15 0 0 0 7.93-2.1l167.92-96.05a16 16 0 0 0 .05-27.89ZM56 224a.6.6 0 0 0 0-.12L85.74 136H144a8 8 0 0 0 0-16H85.74L56.06 32.16A.5.5 0 0 0 56 32l168 95.83Z"/></g></svg><svg xmlns="http://www.w3.org/2000/svg" className={cx("sh__icon")} data-role="icon-retry" aria-hidden="true" focusable="false" viewBox="0 0 256 256"><g fill="currentColor"><path d="M216 128a88 88 0 1 1-88-88a88 88 0 0 1 88 88" opacity=".2"/><path d="M240 56v48a8 8 0 0 1-8 8h-48a8 8 0 0 1 0-16h27.4l-26.59-24.36l-.25-.24a80 80 0 1 0-1.67 114.78a8 8 0 0 1 11 11.63A95.44 95.44 0 0 1 128 224h-1.32a96 96 0 1 1 69.07-164L224 85.8V56a8 8 0 1 1 16 0"/></g></svg></button>
</div>
<p className={cx("sh__note")} data-role="note">전송하지 못했어요</p>
<p className={cx("sb__status sb__status--top")} data-role="status" aria-live="off">보낼 준비 됨</p>
</div>
</div>
);
}08 A Button That Reports a Failed Send With a Fading Shake and Turns Into Retry — Measured area 6.092% · moving frames 15/23Original by GODRICH · SCSS and React ship in the zip · Send Button Animation CSS: 9 Fold-and-Fly Buttons
The post this demo lives in
Send Button Animation CSS: 9 Fold-and-Fly ButtonsA send button should show that something left — 01 folds into a paper plane that banks along a curve, 02 springs back as See all demos in this post
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