recipes/ui/page.tsx
One file of recipes/ui, at commit 9a5bb24.
// The gallery: every system `@aweftjs/ui` ships this step, in each of its states.
//
// One file, written the way an application writes one: JSX, a theme defined at import, cells for
// every piece of state, and no imperative handle anywhere. It is the page `main.ts` builds and
// drives, and the page `npx vite recipes/ui` serves.
import { mutable, mutableArray } from '@aweftjs/core';
import {
Detached, LoaderContext, PopupContext, Shown, Switch, TextField, TextModifiers, Theme,
ThemeContext, Typography, h, mark, suspend,
} from '@aweftjs/ui';
Theme.define({
// This page's own values. The gallery keeps its own look rather than the library's default
// one, because what it is here to exercise is the engine: functions, nesting, `$var`. Every
// value it uses has a name, which is the rule `check-theme.ts` enforces over `recipes/` too.
'*': {
$brand: '#1b6ef3',
$paper: '#ffffff',
$edge: '#d8dbe2',
$pageWidth: '720px',
$pageMargin: '40px',
$line: '1px',
$corner: '6px',
$menuWidth: '160px',
$demoRing: '3px',
$demoRingOffset: '2px',
},
page: {
fontFamily: '$font',
maxWidth: '$pageWidth',
margin: '$pageMargin auto',
padding: '$space6',
display: 'flex',
flexDirection: 'column',
gap: '$space6',
},
section: { display: 'flex', flexDirection: 'column', gap: '$space2' },
heading: { fontSize: '$textLg', lineHeight: '$textLgLine', margin: 0 },
// One entry, three states, and the states are written where they belong rather than in the
// component. `demo_hovered` reaches an element themed `demo primary hovered` too.
demo: {
padding: '$space2 $space4',
borderRadius: '$corner',
border: '$line solid $edge',
background: '$brand',
color: '$contrast_text($brand)',
cursor: 'pointer',
'_cssProp_focus-visible': { outline: '$demoRing solid $hue($brand, 180)', outlineOffset: '$demoRingOffset' },
},
demo_hovered: { background: '$shiftBrightness($brand, -0.12)' },
demo_quiet: { background: 'transparent', color: '$brand' },
tile: { background: '$paper', border: '$line solid $edge', borderRadius: '$corner', padding: '$space3' },
menu: {
background: '$paper',
border: '$line solid $edge',
borderRadius: '$corner',
padding: '$space2',
minWidth: '$menuWidth',
},
// A function defined by this page, used by the entry below it. Theme functions are theme data,
// so a page can add one and a nested theme can replace it.
sized: {
$em: (args: string[]) => `${Number(args[0]) * 16}px`,
fontSize: '$em(1.25)',
},
});
const Spinner = (): unknown => <span id="spinner">loading…</span>;
const Broken = (props: { error?: unknown }): unknown => <span id="failed">{String(props.error)}</span>;
const Slow = suspend(Spinner, async () => {
await new Promise((resolve) => setTimeout(resolve, 30));
return <span id="arrived">the slow part arrived</span>;
});
const Failing = suspend(Spinner, async () => { throw new Error('the loader said no'); }, Broken);
const Row = (props: { each?: unknown }): unknown => <li theme="tile">{props.each as string}</li>;
/** A component that takes its `h` from the cascade, so everything it themes inherits the prefix. */
const Card = ThemeContext.use((themed) => (props: { children?: unknown[] }) =>
themed('div', { theme: 'tile', id: 'card' }, ...(props.children ?? [])));
export const App = (): unknown => {
const clicks = mutable(0);
const hovered = mutable(false);
const focused = mutable(false);
const typed = mutable('');
const open = mutable(false);
const shown = mutable(true);
const stage = mutable<'one' | 'two'>('one');
const rows = mutableArray(['first', 'second']);
const note = mutable('nothing to do yet');
return (
<PopupContext>
<main theme="page" id="page">
<section theme="section">
<h1 theme="heading">Gallery</h1>
<p theme="sized" id="sized">A theme function this page defined.</p>
</section>
<section theme="section">
<h2 theme="heading">Theme, state and events</h2>
<button
id="counter"
theme={['demo', hovered.bool('hovered', null)]}
isHovered={hovered}
isFocused={focused}
onClick={() => clicks.set(clicks.get() + 1)}
>
clicked {clicks} times
</button>
<button id="quiet" theme="demo_quiet">quiet</button>
<p id="focus-state">{focused.bool('focused', 'not focused')}</p>
<input
id="field"
$value={typed}
onInput={(event: { target: { value: string } }) => typed.set(event.target.value)}
/>
<p id="typed">{typed}</p>
</section>
<section theme="section">
<h2 theme="heading">Nested themes</h2>
<div theme="tile" id="outer-tile">outer</div>
<Theme value={{ tile: { background: '#fdf3d8' } }}>
<div theme="tile" id="inner-tile">inner</div>
</Theme>
<ThemeContext value="brand">
<Card>a card built through the cascade</Card>
</ThemeContext>
</section>
<section theme="section">
<h2 theme="heading">Control flow</h2>
<button id="toggle" theme="demo" onClick={() => shown.set(!shown.get())}>toggle</button>
<Shown value={shown}>
<p id="then">shown</p>
<mark.else><p id="else">hidden</p></mark.else>
</Shown>
<button id="switch" theme="demo" onClick={() => stage.set(stage.get() === 'one' ? 'two' : 'one')}>
switch
</button>
<Switch value={stage}>
<mark.case value="one"><p id="case-one">case one</p></mark.case>
<mark.case value="two"><p id="case-two">case two</p></mark.case>
<mark.default><p id="case-none">nothing</p></mark.default>
</Switch>
<ul id="rows"><Row each={rows} /></ul>
<button id="add-row" theme="demo" onClick={() => rows.push(`row ${rows.length + 1}`)}>add a row</button>
</section>
<section theme="section">
<h2 theme="heading">A popup</h2>
<Detached enabled={open}>
<button id="anchor" theme="demo" onClick={() => open.set(!open.get())}>open the menu</button>
<mark.popup>
<div id="menu" theme="menu">
<p>one</p>
<p>two</p>
</div>
</mark.popup>
</Detached>
</section>
<section theme="section">
<h2 theme="heading">Text modifiers</h2>
<TextField label="A note" value={note} id="note-field" />
<TextModifiers
value={[
{ check: 'TODO', return: (word: string) => <b theme="demo_quiet">{word}</b> },
{ check: /@\w+/g, return: (who: string) => <i theme="demo_quiet">{who}</i> },
]}
>
<Typography type="p1" id="note" label={note} />
</TextModifiers>
</section>
<section theme="section">
<h2 theme="heading">Loading, and failing to</h2>
<LoaderContext value={{ loading: Spinner }}>
<p><Slow /></p>
<p><Failing /></p>
</LoaderContext>
</section>
</main>
</PopupContext>
);
};