svelte-kit-vice/src/uix/sema/components/collapsible.ts

import { semaSelector } from '$uix/morfo';
import { collapsibleMorfo } from '$uix/morfo/components/collapsible';
import type { Sema } from '../sema-map';

/**
 * Collapsible perceptual defaults — MIRRORS ACCORDION.
 *
 * Collapsible is the single-panel sibling of Accordion (which already
 * ships a pack). Coherence demands they share the perceptual signature:
 * a user disclosing a section gets the same cue regardless of whether
 * the surface is grouped (accordion) or standalone (collapsible).
 *
 * Per `src/uix/sema/components/accordion.ts`:
 *   - `emerge-expand` (emerge.expand): `emerge.soft` — soft chime at
 *     gain 0.08. The family base ascending contour reads as "panel
 *     reveals".
 *   - `emerge-collapse` (emerge.collapse): `emerge.exit` at gain 0.06
 *     — descending pitch, same direction discipline as the rest of the
 *     system (dialog, drawer, popover, menus).
 *
 * No haptic — disclosure is a deliberate, already-acknowledged gesture
 * on a trigger button; tactile feedback on top would be noise.
 */

const onContent = (matchers?: Parameters<typeof semaSelector<typeof collapsibleMorfo>>[2]) =>
	semaSelector(collapsibleMorfo, 'content', matchers);

export const collapsibleSema: Sema = {
	name: 'collapsible',
	cascade: [
		{
			selector: onContent({ eventName: 'emerge-expand' })
		},
		{
			selector: onContent({ eventName: 'emerge-collapse' })
		}
	]
};