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/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { throttle } from 'throttle-debounce';
import type { Directive } from 'vue';
import type { Awaitable } from '@/types/misc.js';
interface HTMLElementWithObserver extends HTMLElement {
_observer_?: IntersectionObserver;
}
export const appearDirective = {
mounted(src, binding) {
const fn = binding.value;
if (fn == null) return;
const check = throttle<IntersectionObserverCallback>(500, (entries) => {
if (entries.some(entry => entry.isIntersecting)) {
fn();
}
});
const observer = new IntersectionObserver(check);
observer.observe(src);
src._observer_ = observer;
},
unmounted(src) {
if (src._observer_) src._observer_.disconnect();
},
} as Directive<HTMLElementWithObserver, (() => Awaitable<void>) | null | undefined>;
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