egirlskey/packages/frontend/src/directives/appear.ts
Shun Sakai c2370a1be6
chore: 著作権とライセンスについての情報を各ファイルに追加する (#11348)
* chore: Add the SPDX information to each file

Add copyright and licensing information as defined in version 3.0 of
the REUSE Specification.

* tweak format

---------

Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>
2023-07-27 14:31:52 +09:00

27 lines
545 B
TypeScript

/*
* SPDX-FileCopyrightText: syuilo and other misskey contributors
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { Directive } from 'vue';
export default {
mounted(src, binding, vn) {
const fn = binding.value;
if (fn == null) return;
const observer = new IntersectionObserver(entries => {
if (entries.some(entry => entry.isIntersecting)) {
fn();
}
});
observer.observe(src);
src._observer_ = observer;
},
unmounted(src, binding, vn) {
if (src._observer_) src._observer_.disconnect();
},
} as Directive;