Toast stack

// Copyright (c) 2026 Bruno Delorence. MIT License.'use client';import {  useCallback,  useEffect,  useLayoutEffect,  useRef,  useState,  type CSSProperties,  type RefObject,} from 'react';import { ClearIcon, MoonIcon, PlusIcon, SunIcon } from './icons';import { KIND_LABELS, SAMPLES, type ToastContent } from './samples';import { Toast, type Leave } from './toast';import { useAutoplay } from './use-autoplay';import styles from './toast-stack.module.css';/* * Toast stack: notifications that pile up at the bottom of a stage like a deck of cards, the * newest in front and each one behind a little smaller, higher and fainter. Hover the stack, or * tab into it, and it fans out into a list; the timers wait while it is open. *

/* Toast stack (toast-stack.tsx): a stage, light or dark, with a floating toolbar at the top and   the toasts at the bottom. A toast is placed by its index alone, `--i` (0 for the newest):   every toast is the same height, so the stylesheet can work out where each one goes, stacked   or fanned out. Narrow stages (a container query) give the description a third line.   Colours are the tokens below, light-dark(light, dark): the stage takes the color-scheme it   inherits from the page, or the one the colorScheme prop or the toolbar's switch sets   (data-color-scheme on the root). */.root {  container-type: inline-size;  min-width: 0;  /* For the script: a colour the root never shows (it has no outline), white in light and black     in dark, which tells the switch the scheme the root is drawn in. */  outline-color: #fff;}@supports (color: light-dark(#fff, #000)) {  .root {    outline-color: light-dark(#fff, #000);  }}/* The colorScheme prop, or the reader's pick on the switch. Without either, nothing is set:   color-scheme is inherited from the page. */.root[data-color-scheme='light'] {

'use client';import { useEffect, useRef, type CSSProperties, type PointerEvent } from 'react';import { CloseIcon, KindIcon } from './icons';import { KIND_LABELS, type ToastContent } from './samples';import styles from './toast-stack.module.css';/* * One toast: a tinted icon, a title, a description, a close button, a timer, and a swipe to send * it away. Where it sits is the stylesheet's job: the toast only hands on its place in the stack * (`--i`, 0 for the newest) and its state, as data attributes. * * - The timer counts down while `paused` is false and keeps what is left across pauses. A *   hairline along the bottom edge shows what is left: on the toast in front it runs down with the *   timer (the Web Animations API, started and stopped with it); on the others it holds still, *   hidden until the stack opens, so only one animation ever runs. * - A press that travels sideways becomes a swipe: the toast follows the pointer (pointer capture), *   fading as it goes. Let go past a third of its width, or with a flick, and it flies off that *   side; short of that, it springs back. Up and down are left to the page, so a phone still *   scrolls (touch-action: pan-y). *//** How a toast leaves: it fades (its timer, its close button, Clear), or flies off a side (a swipe). */export type Leave = 'fade' | 'left' | 'right';

/* * What a toast says, and the demo's sample toasts. The first three are on the stage when it * loads (the third in front); the toolbar's Add button and the demo go on from the fourth, round * and round, so the four kinds take turns. */export type ToastKind = 'success' | 'error' | 'info' | 'warning';export type ToastContent = {  kind: ToastKind;  title: string;  /** Up to two lines: every toast is the same height, which keeps the stack's maths in CSS. */  description: string;};/** How each kind is named to screen readers, before the title. */export const KIND_LABELS: Record<ToastKind, string> = {  success: 'Success',  error: 'Error',  info: 'Info',  warning: 'Warning',};export const SAMPLES: readonly ToastContent[] = [

import type { ReactNode } from 'react';import type { ToastKind } from './samples';/* * The toast stack's icons: a glyph for each kind of toast (drawn in the kind's colour by the * stylesheet, on a tile of the same colour, lighter), the close button's cross, and the toolbar's. * All decorative: the buttons and toasts around them carry the words. */const GLYPHS: Record<ToastKind, ReactNode> = {  success: <path d="M5.5 10.4 8.6 13.4 14.5 7" />,  error: <path d="M6.8 6.8 13.2 13.2M13.2 6.8 6.8 13.2" />,  info: (    <>      <path d="M10 9.4v5" />      <circle cx="10" cy="6.2" r="1.15" fill="currentColor" stroke="none" />    </>  ),  warning: (    <>      <path d="M10 5.6v5" />      <circle cx="10" cy="14" r="1.15" fill="currentColor" stroke="none" />    </>  ),

'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;