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116 lines
2.6 KiB
116 lines
2.6 KiB
<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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