23 lines
429 B
TypeScript
23 lines
429 B
TypeScript
|
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;
|