anti
f2b3393669
Replaces LICENSE (GPLv3 -> AGPLv3) and prepends `SPDX-License-Identifier: AGPL-3.0-or-later` to every source file across decnet/, decnet_web/, tests/, scripts/, and tools/. Rationale: closes the GPLv3 ASP loophole so any party operating a modified DECNET as a network service must offer their modified source. Personal copyright (Samuel Paschuan) + inbound=outbound contributions make a future unilateral relicense infeasible. - LICENSE: full AGPL-3.0 text (gnu.org/licenses/agpl-3.0.txt) - COPYRIGHT: project copyright notice - tools/add_spdx_headers.py: idempotent header injector (shebang- and PEP 263-aware) Touches 1565 source files (.py, .ts, .tsx, .js, .jsx, .css, .sh). No behavior change; comments only.
51 lines
1.5 KiB
TypeScript
51 lines
1.5 KiB
TypeScript
// SPDX-License-Identifier: AGPL-3.0-or-later
|
|
import { useEffect, type RefObject } from 'react';
|
|
|
|
const FOCUSABLE =
|
|
'input:not([disabled]), button:not([disabled]), textarea:not([disabled]), select:not([disabled]), a[href], [tabindex]:not([tabindex="-1"])';
|
|
|
|
export function useFocusTrap(
|
|
ref: RefObject<HTMLElement | null>,
|
|
active: boolean,
|
|
): void {
|
|
useEffect(() => {
|
|
if (!active || !ref.current) return;
|
|
const root = ref.current;
|
|
const previouslyFocused = document.activeElement as HTMLElement | null;
|
|
|
|
const focusables = () =>
|
|
Array.from(root.querySelectorAll<HTMLElement>(FOCUSABLE)).filter(
|
|
(el) => !el.hasAttribute('aria-hidden') && el.offsetParent !== null,
|
|
);
|
|
|
|
const autoFocus =
|
|
root.querySelector<HTMLElement>('[data-autofocus]') ?? focusables()[0];
|
|
autoFocus?.focus();
|
|
|
|
const handler = (e: KeyboardEvent) => {
|
|
if (e.key !== 'Tab') return;
|
|
const items = focusables();
|
|
if (items.length === 0) {
|
|
e.preventDefault();
|
|
return;
|
|
}
|
|
const first = items[0];
|
|
const last = items[items.length - 1];
|
|
const current = document.activeElement as HTMLElement | null;
|
|
if (e.shiftKey && current === first) {
|
|
e.preventDefault();
|
|
last.focus();
|
|
} else if (!e.shiftKey && current === last) {
|
|
e.preventDefault();
|
|
first.focus();
|
|
}
|
|
};
|
|
|
|
root.addEventListener('keydown', handler);
|
|
return () => {
|
|
root.removeEventListener('keydown', handler);
|
|
previouslyFocused?.focus?.();
|
|
};
|
|
}, [ref, active]);
|
|
}
|