misskey/packages/client/src/directives/get-size.ts

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2021-10-08 15:03:06 +02:00
import { Directive } from 'vue';
export default {
mounted(src, binding, vn) {
const calc = () => {
const height = src.clientHeight;
const width = src.clientWidth;
// 要素が(一時的に)DOMに存在しないときは計算スキップ
if (height === 0) return;
binding.value(width, height);
};
calc();
// Vue3では使えなくなった
// 無くても大丈夫か...
// TODO: ↑大丈夫じゃなかったので解決策を探す
//vn.context.$on('hook:activated', calc);
const ro = new ResizeObserver((entries, observer) => {
calc();
});
ro.observe(src);
src._get_size_ro_ = ro;
},
unmounted(src, binding, vn) {
binding.value(0, 0);
src._get_size_ro_.unobserve(src);
}
} as Directive;