35 lines
933 B
TypeScript
35 lines
933 B
TypeScript
import { Directive } from 'vue';
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import { getScrollContainer, getScrollPosition } from '@/scripts/scroll';
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export default {
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mounted(src, binding, vn) {
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if (binding.value === false) return;
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let isBottom = true;
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const container = getScrollContainer(src)!;
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container.addEventListener('scroll', () => {
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const pos = getScrollPosition(container);
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const viewHeight = container.clientHeight;
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const height = container.scrollHeight;
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isBottom = (pos + viewHeight > height - 32);
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}, { passive: true });
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container.scrollTop = container.scrollHeight;
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const ro = new ResizeObserver((entries, observer) => {
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if (isBottom) {
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const height = container.scrollHeight;
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container.scrollTop = height;
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}
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});
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ro.observe(src);
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// TODO: 新たにプロパティを作るのをやめMapを使う
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src._ro_ = ro;
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},
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unmounted(src, binding, vn) {
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if (src._ro_) src._ro_.unobserve(src);
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}
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} as Directive;
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