import { shallowRef, ref, onMounted } from 'vue';
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import { useThrottleFn, useEventListener } from '@vueuse/core';
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import '../../../utils/index.mjs';
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import { throwError } from '../../../utils/error.mjs';
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const useBackTop = (props, emit, componentName) => {
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const el = shallowRef();
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const container = shallowRef();
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const visible = ref(false);
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const handleScroll = () => {
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if (el.value)
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visible.value = el.value.scrollTop >= props.visibilityHeight;
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};
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const handleClick = (event) => {
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var _a;
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(_a = el.value) == null ? void 0 : _a.scrollTo({ top: 0, behavior: "smooth" });
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emit("click", event);
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};
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const handleScrollThrottled = useThrottleFn(handleScroll, 300, true);
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useEventListener(container, "scroll", handleScrollThrottled);
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onMounted(() => {
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var _a;
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container.value = document;
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el.value = document.documentElement;
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if (props.target) {
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el.value = (_a = document.querySelector(props.target)) != null ? _a : void 0;
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if (!el.value) {
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throwError(componentName, `target does not exist: ${props.target}`);
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}
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container.value = el.value;
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}
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});
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return {
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visible,
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handleClick
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};
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};
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export { useBackTop };
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//# sourceMappingURL=use-backtop.mjs.map
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