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@@ -0,0 +1,141 @@
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+<script setup lang="ts">
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+import { propTypes } from '@/utils/propTypes'
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+import { ref, onMounted, onActivated, shallowRef } from 'vue'
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+import { useEventListener, useWindowSize, isClient } from '@vueuse/core'
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+import type { CSSProperties } from 'vue'
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+const props = defineProps({
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+ // 距离顶部或者底部的距离(单位px)
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+ offset: propTypes.number.def(0),
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+ // 设置元素的堆叠顺序
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+ zIndex: propTypes.number.def(999),
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+ // 设置指定的class
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+ className: propTypes.string.def(''),
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+ // 定位方式,默认为(top),表示距离顶部位置,可以设置为top或者bottom
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+ position: {
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+ type: String,
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+ validator: function (value: string) {
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+ return ['top', 'bottom'].indexOf(value) !== -1
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+ },
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+ default: 'top'
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+ }
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+})
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+const width = ref('auto' as string)
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+const height = ref('auto' as string)
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+const isSticky = ref(false)
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+const refSticky = shallowRef<HTMLElement>()
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+const scrollContainer = shallowRef<HTMLElement | Window>()
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+const { height: windowHeight } = useWindowSize()
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+onMounted(() => {
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+ height.value = refSticky.value?.getBoundingClientRect().height + 'px'
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+
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+ scrollContainer.value = getScrollContainer(refSticky.value!, true)
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+ useEventListener(scrollContainer, 'scroll', handleScroll)
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+ useEventListener('resize', handleReize)
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+ handleScroll()
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+})
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+onActivated(() => {
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+ handleScroll()
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+})
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+
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+const camelize = (str: string): string => {
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+ return str.replace(/-(\w)/g, (_, c) => (c ? c.toUpperCase() : ''))
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+}
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+
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+const getStyle = (element: HTMLElement, styleName: keyof CSSProperties): string => {
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+ if (!isClient || !element || !styleName) return ''
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+
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+ let key = camelize(styleName)
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+ if (key === 'float') key = 'cssFloat'
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+ try {
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+ const style = element.style[styleName]
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+ if (style) return style
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+ const computed = document.defaultView?.getComputedStyle(element, '')
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+ return computed ? computed[styleName] : ''
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+ } catch {
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+ return element.style[styleName]
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+ }
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+}
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+const isScroll = (el: HTMLElement, isVertical?: boolean): boolean => {
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+ if (!isClient) return false
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+ const key = (
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+ {
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+ undefined: 'overflow',
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+ true: 'overflow-y',
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+ false: 'overflow-x'
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+ } as const
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+ )[String(isVertical)]!
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+ const overflow = getStyle(el, key)
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+ return ['scroll', 'auto', 'overlay'].some((s) => overflow.includes(s))
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+}
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+
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+const getScrollContainer = (
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+ el: HTMLElement,
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+ isVertical: boolean
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+): Window | HTMLElement | undefined => {
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+ if (!isClient) return
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+ let parent = el
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+ while (parent) {
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+ if ([window, document, document.documentElement].includes(parent)) return window
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+ if (isScroll(parent, isVertical)) return parent
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+ parent = parent.parentNode as HTMLElement
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+ }
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+ return parent
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+}
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+
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+const handleScroll = () => {
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+ width.value = refSticky.value!.getBoundingClientRect().width! + 'px'
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+ if (props.position === 'top') {
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+ const offsetTop = refSticky.value?.getBoundingClientRect().top
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+ if (offsetTop !== undefined && offsetTop < props.offset) {
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+ sticky()
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+ return
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+ }
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+ reset()
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+ } else {
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+ const offsetBottom = refSticky.value?.getBoundingClientRect().bottom
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+
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+ if (offsetBottom !== undefined && offsetBottom > windowHeight.value - props.offset) {
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+ sticky()
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+ return
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+ }
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+ reset()
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+ }
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+}
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+const handleReize = () => {
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+ if (isSticky.value && refSticky.value) {
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+ width.value = refSticky.value.getBoundingClientRect().width + 'px'
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+ }
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+}
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+const sticky = () => {
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+ if (isSticky.value) {
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+ return
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+ }
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+ isSticky.value = true
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+}
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+const reset = () => {
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+ if (!isSticky.value) {
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+ return
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+ }
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+ width.value = 'auto'
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+ isSticky.value = false
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+}
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+</script>
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+<template>
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+ <div :style="{ height: height, zIndex: zIndex }" ref="refSticky">
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+ <div
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+ :class="className"
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+ :style="{
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+ top: position === 'top' ? offset + 'px' : '',
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+ bottom: position !== 'top' ? offset + 'px' : '',
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+ zIndex: zIndex,
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+ position: isSticky ? 'fixed' : 'static',
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+ width: width,
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+ height: height
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+ }"
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+ >
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+ <slot>
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+ <div>sticky</div>
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+ </slot>
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+ </div>
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+ </div>
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+</template>
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