Feedback toast

// Copyright (c) 2026 Bruno Delorence. MIT License.'use client';import {  useEffect,  useEffectEvent,  useId,  useLayoutEffect,  useRef,  useState,  type CSSProperties,  type KeyboardEvent,} from 'react';import { DemoPointer, runDemo } from './demo-pointer';import { Face, RATINGS, type Rating } from './faces';import { spring } from './spring';import { useAutoplay } from './use-autoplay';import styles from './feedback-toast.module.css';/* * Feedback toast: a toast that confirms an action and asks, with three faces, how it went. * * - Hovering a face lifts it, rings it and plays its expression: the frown deepens, the neutral

/* Feedback toast (feedback-toast.tsx). Every length is a multiple of --u, the stage's unit: 1px   when the stage is wide enough for the toast at full size, less on a narrow one, so the whole   scene shrinks as one. --spring and --spring-ms, the toast's change of shape, come from the   component; --shift-ask, --shift-thanks and --thanks-width from its measures.   Colours are the tokens below, each light-dark(light, dark): the component takes the   color-scheme it inherits from the page (light unless the page says otherwise), or the one its   colorScheme prop sets (data-color-scheme). By day the toast is a white pill with dark words, a   hairline and a soft shadow over a white page; at night a dark grey pill with a lighter hairline   over a dark one. The faces, the sparkles and the green foot are the same in both. */.stage {  /* The page behind the toast and the stage's edge; its values, its terms and the lines between     them; the light strip under the green foot. */  --surface: #fff;  --edge: rgb(0 0 0 / 0.06);  --ink: #111;  --ink-muted: #3a3a3c;  --line: #efefef;  --foot: #d8d9de;  /* The toast's pill, its hairline and its shadow (near and soft; none at night); a chosen face's     empty place, and the comment field, a step off the pill; the field's placeholder. */  --surface-2: #fff;  --surface-2-edge: rgb(0 0 0 / 0.08);

import styles from './feedback-toast.module.css';/* * The three faces: a yellow disc, shaded by a CSS gradient, under an SVG of its features. Each * feature has a class the stylesheet moves while the face is hovered: the sad face's frown * deepens, the neutral one glances aside, the third one's hearts beat and its mouth opens wide. * `excited` draws that last look for good, as the face jumps out of the toast. */export type Rating = 'sad' | 'neutral' | 'love';/** The faces in order, with the names screen readers say. */export const RATINGS: readonly { id: Rating; label: string }[] = [  { id: 'sad', label: 'Sad' },  { id: 'neutral', label: 'Neutral' },  { id: 'love', label: 'Love it' },];/** A heart around (0, 0), about 8.6 wide. */const HEART =  'M0-1.9C-.9-4.1-4.3-3.9-4.3-1.1-4.3 1.2-1.6 2.9 0 4.4 1.6 2.9 4.3 1.2 4.3-1.1 4.3-3.9.9-4.1 0-1.9z';function Eyes() {  return (

'use client';import { useId, type Ref } from 'react';import styles from './feedback-toast.module.css';/* * The demo's pointer, and the timeline that moves it: a script of awaited steps (wait, glide onto * an element, press). Each glide is a curved flight played by the Web Animations API. Stopping the * demo (the reader takes over, or it scrolls away) ends the step in progress at once: its promise * rejects, which ends the script right there, and the pointer fades out. */export type Point = { x: number; y: number };export type Demo = {  /** Resolves after `ms`. */  wait: (ms: number) => Promise<void>;  /** Glides the tip onto `target`, at a point given as shares of its size (its middle by default). */  moveTo: (target: Element | null | undefined, at?: Point) => Promise<void>;  /** Glides the tip to a point in the stage's own px. */  moveToPoint: (to: Point) => Promise<void>;  /** Presses and lets go; `down` runs as the pointer goes down, `up` as it comes back up. */  press: (down: () => void, up: () => void) => Promise<void>;};

/* * Springs as CSS easings. A spring pulls a value to its target and lets it settle: fast at first, * then slowing down, overshooting a little and coming back if it is bouncy. CSS `linear()` draws * any curve through a list of points, so the spring's motion is sampled once, and the same curve * serves CSS transitions and the Web Animations API. */export type Spring = {  /** The curve, as a CSS `linear()` easing. */  easing: string;  /** How long it takes to settle, in ms: the duration to play the curve over. */  duration: number;};/** Points sampled along the curve: plenty for a smooth motion. */const SAMPLES = 40;/** * A spring that covers most of the distance in about `response` ms. With a `bounce` of 0 it * settles without overshooting; at 0.3 it overshoots by about 5% and comes back. */export function spring(bounce: number, response: number): Spring {  // The damping ratio (1: no overshoot) and the natural frequency, in radians per second.  const damping = 1 - bounce;

'use client';import { useCallback, useEffect, useRef, useState } from 'react';/* * When a demo may play on its own: while part of it is on screen and the tab is visible, never * under reduced motion, and not while the reader is using it. `take()` hands it to the reader; it * takes back over `idle` ms after their last input. */export function useAutoplay<T extends HTMLElement>(idle = 6000) {  const ref = useRef<T>(null);  const [visible, setVisible] = useState(false);  const [reduced, setReduced] = useState(true);  const [taken, setTaken] = useState(false);  const timer = useRef(0);  useEffect(() => {    const element = ref.current;    if (!element) return;    let onScreen = false;    const update = () => setVisible(onScreen && !document.hidden);    const observer = new IntersectionObserver(      ([entry]) => {        onScreen = entry.isIntersecting;