<template>
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<!-- #ifdef APP-NVUE -->
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<cell>
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<!-- #endif -->
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<view
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class="u-list-item"
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:ref="`u-list-item-${anchor}`"
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:anchor="`u-list-item-${anchor}`"
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:class="[`u-list-item-${anchor}`]"
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>
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<slot />
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</view>
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<!-- #ifdef APP-NVUE -->
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</cell>
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<!-- #endif -->
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</template>
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<script>
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import props from './props.js';
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// #ifdef APP-NVUE
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const dom = uni.requireNativePlugin('dom')
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// #endif
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/**
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* List 列表
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* @description 该组件为高性能列表组件
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* @tutorial https://www.uviewui.com/components/list.html
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* @property {String | Number} anchor 用于滚动到指定item
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* @example <u-list-ite v-for="(item, index) in indexList" :key="index" ></u-list-item>
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*/
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export default {
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name: 'u-list-item',
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mixins: [uni.$u.mpMixin, uni.$u.mixin,props],
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data() {
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return {
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// 节点信息
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rect: {},
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index: 0,
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show: true,
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sys: uni.$u.sys()
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}
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},
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computed: {
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},
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inject: ['uList'],
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watch: {
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// #ifndef APP-NVUE
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'uList.innerScrollTop'(n) {
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const preLoadScreen = this.uList.preLoadScreen
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const windowHeight = this.sys.windowHeight
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if(n <= windowHeight * preLoadScreen) {
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this.parent.updateOffsetFromChild(0)
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} else if (this.rect.top <= n - windowHeight * preLoadScreen) {
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this.parent.updateOffsetFromChild(this.rect.top)
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}
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}
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// #endif
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},
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created() {
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this.parent = {}
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},
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mounted() {
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this.init()
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},
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methods: {
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init() {
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// 初始化数据
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this.updateParentData()
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this.index = this.parent.children.indexOf(this)
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this.resize()
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},
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updateParentData() {
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// 此方法在mixin中
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this.getParentData('u-list')
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},
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resize() {
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this.queryRect(`u-list-item-${this.anchor}`).then(size => {
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const lastChild = this.parent.children[this.index - 1]
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this.rect = size
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const preLoadScreen = this.uList.preLoadScreen
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const windowHeight = this.sys.windowHeight
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// #ifndef APP-NVUE
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if (lastChild) {
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this.rect.top = lastChild.rect.top + lastChild.rect.height
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}
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if (size.top >= this.uList.innerScrollTop + (1 + preLoadScreen) * windowHeight) this.show =
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false
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// #endif
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})
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},
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// 查询元素尺寸
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queryRect(el) {
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return new Promise(resolve => {
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// #ifndef APP-NVUE
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this.$uGetRect(`.${el}`).then(size => {
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resolve(size)
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})
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// #endif
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// #ifdef APP-NVUE
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const ref = this.$refs[el]
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dom.getComponentRect(ref, res => {
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resolve(res.size)
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})
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// #endif
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})
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}
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}
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}
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</script>
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<style lang="scss" scoped>
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@import "../../libs/css/components.scss";
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.u-list-item {}
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</style>
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