svelte-kit-vice/web/routes/uix/components/aspect-ratio/+page.svelte

<script lang="ts">
	import {
		AspectRatio,
		type AspectRatioProps,
		type AspectRatioValue
	} from '$uix/eidos/components/aspect-ratio';
	import { Box } from '$uix/eidos/components/box';
	import { compileMorfo } from '$uix/morfo';
	import { aspectRatioMorfo } from '@/uix/morfo/components/aspect-ratio';

	type Tab = 'live' | 'api' | 'morfo' | 'sema' | 'recipe' | 'a11y';
	type TraceEntry = { event: string; family: string; intent?: string; at: number };
	let tab = $state<Tab>('live');
	let trace = $state<TraceEntry[]>([]);
	let stageRef = $state<HTMLElement | null>(null);

	// ── Live state ───────────────────────────────────────────────────────
	type RatioPreset = '1' | '4/3' | '16/9' | '21/9' | '3/4' | '2/3';
	const ratioPresets: RatioPreset[] = ['1', '4/3', '16/9', '21/9', '3/4', '2/3'];
	let ratio = $state<RatioPreset>('16/9');
	let maxWidth = $state<number>(420);
	type Demo = 'panel' | 'image' | 'iframe';
	const demoOptions = ['panel', 'image', 'iframe'] as const;
	let demo = $state<Demo>('panel');

	const ratioValue = $derived<AspectRatioValue>(ratio);
	const aspectProps = $derived<Partial<AspectRatioProps>>({
		ratio: ratioValue,
		maxWidth
	});

	// ── Compiled morfo ───────────────────────────────────────────────────
	const compiled = compileMorfo(aspectRatioMorfo);
	const partsList = $derived([...compiled.parts.byKebab.values()]);
	const events = $derived([...compiled.actions.byName.values()]);

	$effect(() => {
		const el = stageRef;
		if (!el) return;
		const obs = new MutationObserver((mutations) => {
			for (const m of mutations) {
				if (m.attributeName !== 'data-event') continue;
				const target = m.target as Element;
				const ev = target.getAttribute('data-event');
				if (!ev) continue;
				trace = [
					{
						event: ev,
						family: target.getAttribute('data-event-family') ?? '—',
						intent: target.getAttribute('data-event-intent') ?? undefined,
						at: Date.now()
					},
					...trace
				].slice(0, 6);
			}
		});
		obs.observe(el, { attributes: true, subtree: true, attributeFilter: ['data-event'] });
		return () => obs.disconnect();
	});

	// ── Snippets ─────────────────────────────────────────────────────────
	const somaSnippet = $derived(
		[
			'<!-- AspectRatio is eidos-native — no soma layer. -->',
			'<!-- Equivalent semantic markup (not real soma): -->',
			'',
			'<div',
			'  data-box',
			'  data-aspect-ratio',
			`  style="aspect-ratio: ${ratio}; overflow: hidden; max-inline-size: ${maxWidth}px;"`,
			'>',
			'  <img src="hero.jpg" alt="" />',
			'</div>'
		].join('\n')
	);

	const eidosSnippet = $derived(
		[
			"<script lang='ts'>",
			"  import { AspectRatio } from '$uix/eidos/components/aspect-ratio';",
			'</' + 'script>',
			'',
			'<AspectRatio',
			ratio !== '1' && `  ratio="${ratio}"`,
			maxWidth !== 0 && `  maxWidth={${maxWidth}}`,
			'>',
			demo === 'image' && '  <img src="hero.jpg" alt="" />',
			demo === 'iframe' && '  <iframe src="…" title="Embed" />',
			demo === 'panel' && '  <div class="panel">…</div>',
			'</AspectRatio>'
		]
			.filter(Boolean)
			.join('\n')
	);
</script>

<div data-uix-canvas-inner>
	<header>
		<div data-uix-eyebrow>Layout · AspectRatio</div>
		<h1 data-uix-page-title>AspectRatio</h1>
		<p data-uix-page-lede>
			Constrains its inner content to a fixed width/height ratio via the modern CSS
			<code>aspect-ratio</code> property. Composes through <a href="/uix/components/box">&lt;Box&gt;</a>,
			so every Box prop (<code>padding</code>, <code>maxWidth</code>, <code>gridColumn</code>, …) still
			works on the wrapper. Useful for video / image / iframe containers that must hold their shape
			regardless of inline size. Eidos-native: no soma backing, no semantic events.
		</p>
		<div data-uix-page-meta>
			<span data-uix-meta-pill>
				<span data-uix-meta-key>parts</span>{compiled.parts.order.length}
			</span>
			<span data-uix-meta-pill>
				<span data-uix-meta-key>events</span>0
			</span>
			<span data-uix-meta-pill>
				<span data-uix-meta-key>extends</span>Box
			</span>
			<span data-uix-meta-pill>
				<span data-uix-meta-key>scope</span>eidos
			</span>
		</div>
	</header>

	<!-- Live preview always rendered -->
	<div data-uix-stage>
		<div data-uix-stage-area bind:this={stageRef}>
			<AspectRatio {...aspectProps} style="border: 1px dashed var(--color-border-default); border-radius: var(--radius-md);">
				{#if demo === 'panel'}
					<div
						style="display: grid; place-items: center; background: linear-gradient(135deg, var(--color-primary-solid), var(--color-affirm-solid)); color: var(--color-content-on-solid); font-size: var(--font-size-xl); font-weight: var(--font-weight-bold);"
					>
						{ratio}
					</div>
				{:else if demo === 'image'}
					<!-- svelte-ignore a11y_img_redundant_alt -->
					<img
						src="https://picsum.photos/seed/uix-aspect/800/600"
						alt="Sample photo placeholder"
					/>
				{:else}
					<iframe
						src="about:blank"
						title="Aspect ratio preview frame"
						style="border: 0;"
					></iframe>
				{/if}
			</AspectRatio>
		</div>
		<div data-uix-stage-trace>
			<span data-uix-stage-trace-key>trace</span>
			<span>{trace.length === 0 ? 'no semantic events' : `${trace.length} event(s)`}</span>
			<span style="color: var(--uix-text-faint)">·</span>
			<span data-uix-stage-trace-key>ratio</span>
			<span>{ratio}</span>
			<span style="margin-inline-start: auto;">
				<span data-uix-stage-trace-key>maxWidth</span>
				{maxWidth}px · <span data-uix-stage-trace-key>demo</span> {demo}
			</span>
		</div>
	</div>

	<div data-uix-tabs role="tablist">
		<button data-uix-tab data-active={tab === 'live'} onclick={() => (tab = 'live')}>Live</button>
		<button data-uix-tab data-active={tab === 'api'} onclick={() => (tab = 'api')}>
			API <span data-uix-tab-count>2</span>
		</button>
		<button data-uix-tab data-active={tab === 'morfo'} onclick={() => (tab = 'morfo')}>
			<span data-uix-layer-badge="morfo">morfo</span>
			<span data-uix-tab-count>{partsList.length}p · 0e</span>
		</button>
		<button data-uix-tab data-active={tab === 'sema'} onclick={() => (tab = 'sema')}>
			<span data-uix-layer-badge="sema">sema</span>
			<span data-uix-tab-count>{events.length}</span>
		</button>
		<button data-uix-tab data-active={tab === 'recipe'} onclick={() => (tab = 'recipe')}>Recipe</button>
		<button data-uix-tab data-active={tab === 'a11y'} onclick={() => (tab = 'a11y')}>A11y</button>
	</div>

	{#if tab === 'live'}
		<section data-uix-section>
			<h2 data-uix-section-title>Controls</h2>
			<p data-uix-section-desc>
				AspectRatio is eidos-native — no <span data-uix-layer-badge="soma">soma</span> split. The
				<code>ratio</code> prop maps to a single <code>--aspect-ratio</code> CSS variable; every
				other prop (<code>maxWidth</code>, <code>padding</code>, …) inherits from Box.
			</p>

			<div data-uix-subsection-head>
				<span data-uix-layer-badge="eidos">eidos</span> props · visual treatment
			</div>
			<div data-uix-controls>
				<label data-uix-control>
					<span data-uix-control-label>ratio</span>
					<span data-uix-chips role="radiogroup">
						{#each ratioPresets as opt}
							<button data-uix-chip data-active={ratio === opt} onclick={() => (ratio = opt)}
								>{opt}</button
							>
						{/each}
					</span>
				</label>
				<label data-uix-control>
					<span data-uix-control-label
						>maxWidth <span data-uix-control-hint>pixels — inherited from Box</span></span
					>
					<input type="range" min="180" max="720" step="20" bind:value={maxWidth} />
					<span data-uix-control-value>{maxWidth}px</span>
				</label>
				<label data-uix-control>
					<span data-uix-control-label>demo content</span>
					<span data-uix-chips role="radiogroup">
						{#each demoOptions as opt}
							<button data-uix-chip data-active={demo === opt} onclick={() => (demo = opt)}
								>{opt}</button
							>
						{/each}
					</span>
				</label>
			</div>

			<!-- ── Code snippets per layer ─────────────────────────────────── -->
			<div data-uix-code>
				<div data-uix-code-head>
					<span data-uix-layer-badge="soma">soma</span>
					<span>n/a · aspect-ratio is eidos-native — equivalent markup shown</span>
					<span data-uix-code-lang>svelte</span>
				</div>
				<pre><code>{somaSnippet}</code></pre>
			</div>

			<div data-uix-code style="margin-top: var(--uix-space-3);">
				<div data-uix-code-head>
					<span data-uix-layer-badge="eidos">eidos</span>
					<span>visual · ratio maps to --aspect-ratio</span>
					<span data-uix-code-lang>svelte</span>
				</div>
				<pre><code>{eidosSnippet}</code></pre>
			</div>
		</section>
	{/if}

	{#if tab === 'api'}
		<section data-uix-section>
			<h2 data-uix-section-title>API reference</h2>
			<p data-uix-section-desc>
				The <code>ratio</code> prop accepts a number (e.g. <code>16/9</code> evaluated in JS) or a
				string fraction (e.g. <code>"16/9"</code> emitted verbatim into CSS). Every other Box prop
				(<code>padding</code>, <code>margin</code>, <code>maxWidth</code>, <code>gridColumn</code>,
				…) passes through to the underlying <code>&lt;Box&gt;</code> shell.
			</p>

			<div data-uix-subsection-head>Aspect ratio</div>
			<div data-uix-table-wrap>
				<table data-uix-table>
					<thead><tr><th>Prop</th><th>Type</th><th>Notes</th></tr></thead>
					<tbody>
						<tr>
							<td class="name">ratio</td>
							<td class="type">number | string</td>
							<td>
								Number → CSS <code>aspect-ratio</code> as a decimal; string passes through
								verbatim (<code>"16/9"</code>, <code>"4 / 3"</code>, <code>"1.5"</code>).
								Default <code>1</code>.
							</td>
						</tr>
					</tbody>
				</table>
			</div>

			<div data-uix-subsection-head>Inherited from Box</div>
			<div data-uix-table-wrap>
				<table data-uix-table>
					<thead><tr><th>Prop</th><th>Type</th><th>Notes</th></tr></thead>
					<tbody>
						<tr>
							<td class="name">width / minWidth / maxWidth</td>
							<td class="type">number | string</td>
							<td>Constrains the box's inline size while keeping the ratio.</td>
						</tr>
						<tr>
							<td class="name">padding / margin (and per-side)</td>
							<td class="type">number | string</td>
							<td>Numbers map to <code>var(--space-N)</code>.</td>
						</tr>
						<tr>
							<td class="name">gridColumn / gridRow / placeSelf</td>
							<td class="type">string</td>
							<td>Use AspectRatio as a grid item — placement props live on Box.</td>
						</tr>
						<tr>
							<td class="name">…</td>
							<td class="type">BoxProps</td>
							<td>See <a href="/uix/components/box">&lt;Box&gt;</a> for the full surface.</td>
						</tr>
					</tbody>
				</table>
			</div>

			<div data-uix-subsection-head>Reference comparison</div>
			<div data-uix-table-wrap>
				<table data-uix-table>
					<thead>
						<tr><th>Library</th><th>Closest equivalent</th><th>Difference</th></tr>
					</thead>
					<tbody>
						<tr>
							<td class="name">radix-themes</td>
							<td><code>&lt;AspectRatio&gt;</code></td>
							<td>
								Radix exposes a numeric <code>ratio</code> only; UIX additionally accepts a
								string fraction so the value reads literal in DevTools.
							</td>
						</tr>
						<tr>
							<td class="name">chakra-ui</td>
							<td><code>&lt;AspectRatio&gt;</code></td>
							<td>
								Chakra mixes the prop with the chained style-prop system; UIX keeps it pure
								layout — every other concern (background, color) lives elsewhere.
							</td>
						</tr>
						<tr>
							<td class="name">mantine</td>
							<td><code>&lt;AspectRatio&gt;</code></td>
							<td>
								Mantine ships the same primitive; UIX adds the string-form ratio + composes
								through Box for inherited sizing props.
							</td>
						</tr>
					</tbody>
				</table>
			</div>
		</section>
	{/if}

	{#if tab === 'morfo'}
		<section data-uix-section>
			<h2 data-uix-section-title>Morfo contract</h2>

			<div data-uix-table-wrap>
				<table data-uix-table>
					<thead><tr><th>Field</th><th>Value</th></tr></thead>
					<tbody>
						<tr><td class="name">name</td><td>{aspectRatioMorfo.name}</td></tr>
						<tr><td class="name">kebab</td><td><code>{aspectRatioMorfo.kebab}</code></td></tr>
						<tr><td class="name">scope</td><td>{aspectRatioMorfo.scope.join(', ')}</td></tr>
						<tr><td class="name">parts</td><td>{partsList.length}</td></tr>
						<tr><td class="name">events</td><td>0</td></tr>
					</tbody>
				</table>
			</div>

			<div data-uix-subsection-head>Parts</div>
			<div data-uix-table-wrap>
				<table data-uix-table>
					<thead>
						<tr>
							<th>kebab</th>
							<th>marker</th>
							<th>element</th>
							<th>archetype</th>
							<th>optional</th>
						</tr>
					</thead>
					<tbody>
						{#each partsList as part}
							<tr>
								<td class="name">{part.kebab}</td>
								<td><code data-uix-part-marker>[{part.marker}]</code></td>
								<td class="type">&lt;{part.defaultElement}&gt;</td>
								<td class="type">{part.archetype}</td>
								<td class="default">{part.optional ? 'yes' : 'no'}</td>
							</tr>
						{/each}
					</tbody>
				</table>
			</div>

			<p data-uix-section-desc style="margin-top: var(--uix-space-4);">
				The Provider part emits only the <code>data-aspect-ratio</code> marker on top of the Box
				shell — no states, no data properties, no aria attributes, no keyboard. The recipe consumes
				the <code>--aspect-ratio</code> CSS variable the component writes inline.
			</p>
		</section>
	{/if}

	{#if tab === 'sema'}
		<section data-uix-section>
			<h2 data-uix-section-title>
				<span data-uix-layer-badge="sema">sema</span> · events
			</h2>
			<p data-uix-section-desc>
				AspectRatio declares no semantic events. As a passive layout primitive, it does not commit,
				emerge, or react to anything — it just constrains its child's geometry. Components that animate
				or change state on appearance should compose AspectRatio inside a primitive (popover, drawer,
				collapsible) that owns the relevant sema verbs.
			</p>
		</section>
	{/if}

	{#if tab === 'recipe'}
		<section data-uix-section>
			<h2 data-uix-section-title>Eidos recipe</h2>
			<p data-uix-section-desc>
				Recipe lives in <code>src/uix/eidos/components/aspect-ratio/aspect-ratio.css</code>. The
				Box shell carries the box-model surface; this recipe only adds the
				<code>aspect-ratio</code> property and stretches the lone child to fill the box.
			</p>
			<div data-uix-table-wrap>
				<table data-uix-table>
					<thead><tr><th>Selector</th><th>Owner</th><th>Purpose</th></tr></thead>
					<tbody>
						<tr>
							<td class="name"><code>[data-aspect-ratio]</code></td>
							<td><span data-uix-tag data-kind="morfo">morfo</span></td>
							<td>Provider marker. Emitted by the component on top of the Box shell.</td>
						</tr>
						<tr>
							<td class="name"
								><code>[data-box][data-aspect-ratio] {`{ aspect-ratio: var(--aspect-ratio, 1); }`}</code></td
							>
							<td><span data-uix-tag data-kind="eidos">eidos</span></td>
							<td>Sets the CSS ratio from the variable the component writes inline.</td>
						</tr>
						<tr>
							<td class="name"
								><code>{`[data-box][data-aspect-ratio] > * { 100% × 100%, object-fit: cover }`}</code></td
							>
							<td><span data-uix-tag data-kind="eidos">eidos</span></td>
							<td>
								Stretches the lone child (img / iframe / video / inner div) to fill the box.
							</td>
						</tr>
					</tbody>
				</table>
			</div>
		</section>
	{/if}

	{#if tab === 'a11y'}
		<section data-uix-section>
			<h2 data-uix-section-title>Accessibility</h2>
			<div data-uix-table-wrap>
				<table data-uix-table>
					<thead><tr><th>Concern</th><th>Contract</th></tr></thead>
					<tbody>
						<tr>
							<td class="name">Role</td>
							<td>
								None implicit. Default element is <code>&lt;div&gt;</code> — semantically
								neutral. When wrapping media, supply the appropriate landmark / role on the
								child (<code>&lt;img alt&gt;</code>, <code>&lt;iframe title&gt;</code>,
								<code>&lt;video&gt;</code> with captions).
							</td>
						</tr>
						<tr>
							<td class="name">Label</td>
							<td>
								Not applicable — AspectRatio has no content semantics. Labels belong to the
								child it constrains.
							</td>
						</tr>
						<tr>
							<td class="name">Keyboard</td>
							<td>AspectRatio is not focusable. Tab order follows the child.</td>
						</tr>
						<tr>
							<td class="name">Focus visible</td>
							<td>AspectRatio does not paint a focus ring.</td>
						</tr>
						<tr>
							<td class="name">Reduced motion</td>
							<td>
								No motion of its own. If the child is a video / animation, the consumer is
								responsible for honouring <code>prefers-reduced-motion</code>.
							</td>
						</tr>
					</tbody>
				</table>
			</div>
		</section>
	{/if}
</div>