anti
d0463c2c16
- Modal: shared backdrop/panel with ESC-close, backdrop-click-close, focus trap, body scroll lock; supports center + drawer-right variants, matrix/violet accents, default/wide widths. - EmptyState: icon + title + hint + optional CTA; compact variant for tight rails. - useEscapeKey, useFocusTrap: reusable hooks powering Modal; will also be adopted by CommandPalette and ContextMenu in follow-up commits. No retrofits yet — primitives only. tsc clean.
50 lines
1.5 KiB
TypeScript
50 lines
1.5 KiB
TypeScript
import { useEffect, type RefObject } from 'react';
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const FOCUSABLE =
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'input:not([disabled]), button:not([disabled]), textarea:not([disabled]), select:not([disabled]), a[href], [tabindex]:not([tabindex="-1"])';
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export function useFocusTrap(
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ref: RefObject<HTMLElement | null>,
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active: boolean,
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): void {
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useEffect(() => {
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if (!active || !ref.current) return;
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const root = ref.current;
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const previouslyFocused = document.activeElement as HTMLElement | null;
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const focusables = () =>
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Array.from(root.querySelectorAll<HTMLElement>(FOCUSABLE)).filter(
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(el) => !el.hasAttribute('aria-hidden') && el.offsetParent !== null,
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);
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const autoFocus =
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root.querySelector<HTMLElement>('[data-autofocus]') ?? focusables()[0];
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autoFocus?.focus();
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const handler = (e: KeyboardEvent) => {
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if (e.key !== 'Tab') return;
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const items = focusables();
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if (items.length === 0) {
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e.preventDefault();
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return;
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}
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const first = items[0];
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const last = items[items.length - 1];
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const current = document.activeElement as HTMLElement | null;
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if (e.shiftKey && current === first) {
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e.preventDefault();
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last.focus();
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} else if (!e.shiftKey && current === last) {
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e.preventDefault();
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first.focus();
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}
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};
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root.addEventListener('keydown', handler);
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return () => {
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root.removeEventListener('keydown', handler);
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previouslyFocused?.focus?.();
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};
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}, [ref, active]);
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}
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