AudioRecorderDemo.jsx
"use client";
import { useEffect, useId, useLayoutEffect, useRef, useState } from 'react';
import './AudioRecorderDemo.css';
const INITIAL_SECONDS = 10 * 60 + 4;
const DURATION_SECONDS = INITIAL_SECONDS * 2;
const DOT_COLUMNS = 33;
const DOT_ROWS = [-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5];
const DOT_PROFILE = [
1.2, 2.2, 3.4, 3.1, 2.1, 1.2, 2.0, 3.0, 2.1, 1.1,
1.3, 2.1, 2.6, 1.4, 2.3, 1.3, 1.8, 2.5, 1.2, 1.0,
2.2, 2.5, 1.3, 2.0, 1.2, 1.0, 2.2, 3.1, 1.6, 1.1,
1.5, 2.4, 1.1, 1.0, 2.7, 2.0, 1.3, 1.0, 2.0, 3.0,
1.4, 1.1, 2.1, 1.3, 2.8, 1.5, 1.0, 2.2,
];
function clamp(value, min, max) {
return Math.min(max, Math.max(min, value));
}
function formatTime(seconds) {
const whole = Math.round(seconds);
const hours = Math.floor(whole / 3600);
const minutes = Math.floor((whole % 3600) / 60);
const remainingSeconds = whole % 60;
return [hours, minutes, remainingSeconds].map((part) => String(part).padStart(2, '0')).join(':');
}
function sampledHeight(index) {
const wrapped = ((index % DOT_PROFILE.length) + DOT_PROFILE.length) % DOT_PROFILE.length;
const first = Math.floor(wrapped);
const mix = wrapped - first;
return DOT_PROFILE[first] * (1 - mix) + DOT_PROFILE[(first + 1) % DOT_PROFILE.length] * mix;
}
function SettingsIcon() {
return (<svg width="18" height="18" viewBox="0 0 18 18" fill="none" aria-hidden="true">
<path d="M2 5h13M2 13h13" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round"/>
<circle cx="11.5" cy="5" r="2" fill="#000" stroke="currentColor" strokeWidth="1.4"/>
<circle cx="6.5" cy="13" r="2" fill="#000" stroke="currentColor" strokeWidth="1.4"/>
</svg>);
}
export function AudioRecorderDemo({ thumbnail = false, reducedMotion: reducedMotionProp = false }) {
const stageRef = useRef(null);
const waveformRef = useRef(null);
const settingsRef = useRef(null);
const settingsButtonRef = useRef(null);
const menuRef = useRef(null);
const pointerIdRef = useRef(null);
const grabOffsetRef = useRef(0);
const dragStartRef = useRef(INITIAL_SECONDS);
const positionRef = useRef(INITIAL_SECONDS);
const phaseRef = useRef(0);
const menuAnimationRef = useRef(null);
const menuId = useId();
const seekHelpId = useId();
const [scale, setScale] = useState(1);
const [visible, setVisible] = useState(!thumbnail);
const [pageVisible, setPageVisible] = useState(() => typeof document === 'undefined' || document.visibilityState === 'visible');
const [systemReducedMotion, setSystemReducedMotion] = useState(false);
const reducedMotion = reducedMotionProp || systemReducedMotion;
const [playing, setPlaying] = useState(true);
const [dragging, setDragging] = useState(false);
const [position, setPosition] = useState(INITIAL_SECONDS);
const [visualPhase, setVisualPhase] = useState(0);
const [settingsOpen, setSettingsOpen] = useState(false);
const [menuMounted, setMenuMounted] = useState(false);
const [motion, setMotion] = useState('expressive');
useLayoutEffect(() => {
const stage = stageRef.current;
if (!stage)
return;
const mobileThumbnailQuery = window.matchMedia('(max-width: 720px)');
const resize = () => {
const { width, height } = stage.getBoundingClientRect();
const fittedScale = Math.max(0.25, Math.min(1, (width - 24) / 296, (height - 24) / 296));
const thumbnailScale = mobileThumbnailQuery.matches ? 0.65 : 0.8;
setScale(fittedScale * (thumbnail ? thumbnailScale : 1));
};
resize();
const observer = new ResizeObserver(resize);
observer.observe(stage);
mobileThumbnailQuery.addEventListener('change', resize);
return () => {
observer.disconnect();
mobileThumbnailQuery.removeEventListener('change', resize);
};
}, [thumbnail]);
useEffect(() => {
const query = window.matchMedia('(prefers-reduced-motion: reduce)');
const update = () => setSystemReducedMotion(query.matches);
update();
query.addEventListener('change', update);
return () => query.removeEventListener('change', update);
}, []);
useEffect(() => {
const update = () => setPageVisible(document.visibilityState === 'visible');
document.addEventListener('visibilitychange', update);
return () => document.removeEventListener('visibilitychange', update);
}, []);
useEffect(() => {
if (!thumbnail)
return;
const stage = stageRef.current;
if (!stage)
return;
const observer = new IntersectionObserver(([entry]) => {
if (entry.isIntersecting) {
positionRef.current = INITIAL_SECONDS;
phaseRef.current = 0;
setPosition(INITIAL_SECONDS);
setVisualPhase(0);
setPlaying(true);
}
setVisible(entry.isIntersecting);
}, { threshold: 0.15 });
observer.observe(stage);
return () => observer.disconnect();
}, [thumbnail]);
useEffect(() => {
if (!playing || !visible || !pageVisible || dragging)
return;
let frame = 0;
let last = performance.now();
let lastPaint = 0;
const tick = (now) => {
const delta = Math.max(0, (now - last) / 1000);
last = now;
positionRef.current = Math.min(DURATION_SECONDS, positionRef.current + delta);
if (!reducedMotion)
phaseRef.current += Math.min(delta, 0.08) * (motion === 'expressive' ? 3.4 : 2.3);
if (now - lastPaint >= 45 || positionRef.current === DURATION_SECONDS) {
setPosition(positionRef.current);
if (!reducedMotion)
setVisualPhase(phaseRef.current);
lastPaint = now;
}
if (positionRef.current >= DURATION_SECONDS) {
setPlaying(false);
return;
}
frame = requestAnimationFrame(tick);
};
frame = requestAnimationFrame(tick);
return () => cancelAnimationFrame(frame);
}, [playing, visible, pageVisible, dragging, reducedMotion, motion]);
useEffect(() => {
if (settingsOpen || !menuMounted)
return;
const timer = window.setTimeout(() => setMenuMounted(false), 170);
return () => window.clearTimeout(timer);
}, [settingsOpen, menuMounted]);
useEffect(() => {
if (!settingsOpen)
return;
const frame = requestAnimationFrame(() => {
menuRef.current?.querySelector('[aria-checked="true"]')?.focus();
});
const closeOutside = (event) => {
if (!settingsRef.current?.contains(event.target))
setSettingsOpen(false);
};
document.addEventListener('pointerdown', closeOutside);
return () => {
cancelAnimationFrame(frame);
document.removeEventListener('pointerdown', closeOutside);
};
}, [settingsOpen]);
useEffect(() => () => {
if (menuAnimationRef.current !== null)
cancelAnimationFrame(menuAnimationRef.current);
}, []);
const seekTo = (next, stopAtEnd = true) => {
const value = clamp(next, 0, DURATION_SECONDS);
positionRef.current = value;
setPosition(value);
if (stopAtEnd && value >= DURATION_SECONDS)
setPlaying(false);
};
const seekFromClient = (clientX) => {
const rect = waveformRef.current?.getBoundingClientRect();
if (!rect)
return;
const fraction = clamp((clientX - grabOffsetRef.current - rect.left) / rect.width, 0, 1);
seekTo(fraction * DURATION_SECONDS, false);
};
const handleSeekDown = (event) => {
if (pointerIdRef.current !== null)
return;
if (event.pointerType === 'mouse' && event.button !== 0)
return;
const rect = waveformRef.current?.getBoundingClientRect();
if (!rect)
return;
event.currentTarget.focus();
event.currentTarget.setPointerCapture(event.pointerId);
pointerIdRef.current = event.pointerId;
dragStartRef.current = positionRef.current;
const currentX = rect.left + (positionRef.current / DURATION_SECONDS) * rect.width;
grabOffsetRef.current = Math.abs(event.clientX - currentX) <= 24 * scale ? event.clientX - currentX : 0;
setDragging(true);
seekFromClient(event.clientX);
};
const handleSeekMove = (event) => {
if (pointerIdRef.current === event.pointerId)
seekFromClient(event.clientX);
};
const endSeek = (event, cancel = false) => {
if (pointerIdRef.current !== event.pointerId)
return;
if (cancel)
seekTo(dragStartRef.current, false);
else if (positionRef.current >= DURATION_SECONDS)
setPlaying(false);
if (event.currentTarget.hasPointerCapture(event.pointerId))
event.currentTarget.releasePointerCapture(event.pointerId);
pointerIdRef.current = null;
setDragging(false);
};
const handleSeekKey = (event) => {
let next = null;
const step = event.shiftKey ? 30 : 5;
if (event.key === 'ArrowLeft' || event.key === 'ArrowDown')
next = positionRef.current - step;
if (event.key === 'ArrowRight' || event.key === 'ArrowUp')
next = positionRef.current + step;
if (event.key === 'PageDown')
next = positionRef.current - 30;
if (event.key === 'PageUp')
next = positionRef.current + 30;
if (event.key === 'Home')
next = 0;
if (event.key === 'End')
next = DURATION_SECONDS;
if (event.key === 'Escape' && pointerIdRef.current !== null) {
event.preventDefault();
seekTo(dragStartRef.current);
if (event.currentTarget.hasPointerCapture(pointerIdRef.current))
event.currentTarget.releasePointerCapture(pointerIdRef.current);
pointerIdRef.current = null;
setDragging(false);
return;
}
if (next !== null) {
event.preventDefault();
seekTo(next);
}
};
const openMenu = () => {
if (menuAnimationRef.current !== null)
cancelAnimationFrame(menuAnimationRef.current);
setMenuMounted(true);
menuAnimationRef.current = requestAnimationFrame(() => {
setSettingsOpen(true);
menuAnimationRef.current = null;
});
};
const closeMenu = (returnFocus = false) => {
if (menuAnimationRef.current !== null) {
cancelAnimationFrame(menuAnimationRef.current);
menuAnimationRef.current = null;
}
setSettingsOpen(false);
if (returnFocus)
requestAnimationFrame(() => settingsButtonRef.current?.focus());
};
const handleMenuKey = (event) => {
const items = Array.from(menuRef.current?.querySelectorAll('[role="menuitemradio"]') ?? []);
const index = items.indexOf(document.activeElement);
if (event.key === 'Escape') {
event.preventDefault();
closeMenu(true);
}
else if (event.key === 'ArrowDown' || event.key === 'ArrowUp' || event.key === 'Home' || event.key === 'End') {
event.preventDefault();
const next = event.key === 'Home' ? 0
: event.key === 'End' ? items.length - 1
: (index + (event.key === 'ArrowDown' ? 1 : -1) + items.length) % items.length;
items[next]?.focus();
}
else if (event.key === 'Tab') {
closeMenu();
}
};
const togglePlayback = () => {
if (!playing && positionRef.current >= DURATION_SECONDS)
seekTo(0);
setPlaying((current) => !current);
};
const progress = position / DURATION_SECONDS;
const renderedDots = Array.from({ length: DOT_COLUMNS }, (_, column) => {
const x = 2 + column * 8;
const isPast = column / (DOT_COLUMNS - 1) <= progress;
const height = isPast
? clamp((sampledHeight(column + visualPhase * 1.1) - 1) * (motion === 'expressive' ? 2 : 1.65)
+ (reducedMotion ? 0 : Math.sin(visualPhase * 4.6 + column * 0.73) * (motion === 'expressive' ? 0.55 : 0.35)), 0, 5)
: 0;
return DOT_ROWS.map((row) => {
const distance = Math.abs(row);
const opacity = distance === 0
? (isPast ? 0.94 : 0.32)
: (isPast ? clamp(height - distance + 0.55, 0, 1) * 0.9 : 0);
return (<g key={String(column) + '-' + String(row)}>
<circle cx={x} cy={48 + row * 8} r="3.8" fill="#c68d13" opacity={opacity * 0.28} className="audio-recorder-dot-halo"/>
<circle cx={x} cy={48 + row * 8} r="1.8" fill="#f5bd19" opacity={opacity} className="audio-recorder-dot-core"/>
</g>);
});
});
return (<div ref={stageRef} className={'audio-recorder-stage' + (thumbnail ? ' audio-recorder-stage--thumbnail' : '')} data-reduced={reducedMotion ? 'true' : undefined}>
<div className={'audio-recorder-card audio-recorder-card--' + motion} style={{ transform: 'translate(-50%, -50%) scale(' + scale + ')' }} role={thumbnail ? undefined : 'group'} aria-label={thumbnail ? undefined : 'Audio playback visual simulation'}>
<div className="audio-recorder-heading">
<span>New Audio</span>
<span className="audio-recorder-date">04.03.23</span>
</div>
{thumbnail ? (<span className="audio-recorder-settings audio-recorder-settings--decorative" aria-hidden="true"><SettingsIcon /></span>) : (<div ref={settingsRef} className="audio-recorder-settings-wrap" onBlur={(event) => {
if (settingsOpen && !settingsRef.current?.contains(event.relatedTarget))
closeMenu();
}}>
<button ref={settingsButtonRef} type="button" className="audio-recorder-settings" aria-label="Waveform options" aria-haspopup="menu" aria-expanded={settingsOpen} aria-controls={menuMounted ? menuId : undefined} onClick={() => settingsOpen ? closeMenu(true) : openMenu()} onKeyDown={(event) => {
if (event.key === 'ArrowDown' || event.key === 'ArrowUp') {
event.preventDefault();
openMenu();
}
else if (event.key === 'Escape') {
closeMenu(true);
}
}}>
<SettingsIcon />
</button>
{menuMounted && (<div id={menuId} ref={menuRef} className="audio-recorder-popover" data-open={settingsOpen} role="menu" aria-label="Waveform animation" aria-hidden={!settingsOpen} onKeyDown={handleMenuKey}>
{['steady', 'expressive'].map((option) => (<button key={option} type="button" role="menuitemradio" aria-checked={motion === option} tabIndex={-1} className="audio-recorder-motion-option" onClick={() => {
setMotion(option);
closeMenu(true);
}}>
<span className="audio-recorder-option-check" aria-hidden="true">
<svg width="16" height="16" viewBox="0 0 16 16" fill="none">
<path d="m2.8 8 3.3 3.2 7.1-7" stroke="currentColor" strokeWidth="1.8" strokeLinecap="round" strokeLinejoin="round"/>
</svg>
</span>
<span>{option === 'steady' ? 'Steady' : 'Expressive'}</span>
</button>))}
</div>)}
</div>)}
<div ref={waveformRef} className="audio-recorder-waveform">
<svg className="audio-recorder-dot-wave" viewBox="0 0 260 96" aria-hidden="true">
{renderedDots}
</svg>
{thumbnail ? (<span className="audio-recorder-playhead" style={{ left: String(progress * 100) + '%' }} aria-hidden="true">
<span className="audio-recorder-playhead-dot"/>
</span>) : (<div className={'audio-recorder-scrubber' + (dragging ? ' is-dragging' : '')} role="slider" tabIndex={0} aria-label="Audio position" aria-valuemin={0} aria-valuemax={DURATION_SECONDS} aria-valuenow={Math.round(position)} aria-valuetext={formatTime(position) + ' of ' + formatTime(DURATION_SECONDS)} aria-describedby={seekHelpId} onPointerDown={handleSeekDown} onPointerMove={handleSeekMove} onPointerUp={(event) => endSeek(event)} onPointerCancel={(event) => endSeek(event, true)} onKeyDown={handleSeekKey}>
<span className="audio-recorder-playhead" style={{ left: String(progress * 100) + '%' }} aria-hidden="true">
<span className="audio-recorder-playhead-dot"/>
</span>
</div>)}
</div>
{!thumbnail && <span id={seekHelpId} className="audio-recorder-sr-only">Drag to seek. Arrow keys move five seconds. Hold Shift for thirty seconds. Home and End jump to the start or end.</span>}
<span className="audio-recorder-time" aria-label={'Audio position ' + formatTime(position)}>
{formatTime(position)}
</span>
{thumbnail ? (<span className="audio-recorder-transport is-playing" aria-hidden="true">
<span className="audio-recorder-transport-pause"><i /><i /></span>
<span className="audio-recorder-transport-play"/>
</span>) : (<button type="button" className={'audio-recorder-transport' + (playing ? ' is-playing' : '')} aria-label={playing ? 'Pause visual audio' : 'Play visual audio'} onClick={togglePlayback}>
<span className="audio-recorder-transport-pause" aria-hidden="true"><i /><i /></span>
<span className="audio-recorder-transport-play" aria-hidden="true"/>
</button>)}
</div>
</div>);
}