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/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { getScrollPosition, getScrollContainer, getStickyBottom, getStickyTop } from '@@/js/scroll.js';
import { getElementOrNull, getNodeOrNull } from '@/scripts/get-dom-node-or-null.js';
type MaybeHTMLElement = EventTarget | Node | Element | HTMLElement;
export const isFocusable = (input: MaybeHTMLElement | null | undefined): input is HTMLElement => {
if (input == null || !(input instanceof HTMLElement)) return false;
if (input.tabIndex < 0) return false;
if ('disabled' in input && input.disabled === true) return false;
if ('readonly' in input && input.readonly === true) return false;
if (!input.ownerDocument.contains(input)) return false;
const style = window.getComputedStyle(input);
if (style.display === 'none') return false;
if (style.visibility === 'hidden') return false;
if (style.opacity === '0') return false;
if (style.pointerEvents === 'none') return false;
return true;
};
export const focusPrev = (input: MaybeHTMLElement | null | undefined, self = false, scroll = true) => {
const element = self ? input : getElementOrNull(input)?.previousElementSibling;
if (element == null) return;
if (isFocusable(element)) {
focusOrScroll(element, scroll);
} else {
focusPrev(element, false, scroll);
}
};
export const focusNext = (input: MaybeHTMLElement | null | undefined, self = false, scroll = true) => {
const element = self ? input : getElementOrNull(input)?.nextElementSibling;
if (element == null) return;
if (isFocusable(element)) {
focusOrScroll(element, scroll);
} else {
focusNext(element, false, scroll);
}
};
export const focusParent = (input: MaybeHTMLElement | null | undefined, self = false, scroll = true) => {
const element = self ? input : getNodeOrNull(input)?.parentElement;
if (element == null) return;
if (isFocusable(element)) {
focusOrScroll(element, scroll);
} else {
focusParent(element, false, scroll);
}
};
const focusOrScroll = (element: HTMLElement, scroll: boolean) => {
if (scroll) {
const scrollContainer = getScrollContainer(element) ?? document.documentElement;
const scrollContainerTop = getScrollPosition(scrollContainer);
const stickyTop = getStickyTop(element, scrollContainer);
const stickyBottom = getStickyBottom(element, scrollContainer);
const top = element.getBoundingClientRect().top;
const bottom = element.getBoundingClientRect().bottom;
let scrollTo = scrollContainerTop;
if (top < stickyTop) {
scrollTo += top - stickyTop;
} else if (bottom > window.innerHeight - stickyBottom) {
scrollTo += bottom - window.innerHeight + stickyBottom;
}
scrollContainer.scrollTo({ top: scrollTo, behavior: 'instant' });
}
if (document.activeElement !== element) {
element.focus({ preventScroll: true });
}
};
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