misskey/src/client/directives/size.ts

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import { Directive } from 'vue';
//const observers = new Map<Element, ResizeObserver>();
export default {
mounted(src, binding, vn) {
const query = binding.value;
const addClass = (el: Element, cls: string) => {
el.classList.add(cls);
};
const removeClass = (el: Element, cls: string) => {
el.classList.remove(cls);
};
const calc = () => {
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 (width === 0) return;
if (query.max) {
for (const v of query.max) {
if (width <= v) {
addClass(src, 'max-width_' + v + 'px');
} else {
removeClass(src, 'max-width_' + v + 'px');
}
}
}
if (query.min) {
for (const v of query.min) {
if (width >= v) {
addClass(src, 'min-width_' + v + 'px');
} else {
removeClass(src, 'min-width_' + v + 'px');
}
}
}
};
calc();
window.addEventListener('resize', 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(el);
// TODO: 新たにプロパティを作るのをやめMapを使う
// ただメモリ的には↓の方が省メモリかもしれないので検討中
//el._ro_ = ro;
src._calc_ = calc;
},
unmounted(src, binding, vn) {
//el._ro_.unobserve(el);
window.removeEventListener('resize', src._calc_);
}
} as Directive;