184 lines
5.9 KiB
Vue
184 lines
5.9 KiB
Vue
<template>
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<!-- #ifdef APP-NVUE -->
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<list
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class="u-list"
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:enableBackToTop="enableBackToTop"
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:loadmoreoffset="lowerThreshold"
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:showScrollbar="showScrollbar"
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:style="[listStyle]"
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:offset-accuracy="Number(offsetAccuracy)"
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@scroll="onScroll"
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@loadmore="scrolltolower"
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>
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<slot />
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</list>
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<!-- #endif -->
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<!-- #ifndef APP-NVUE -->
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<scroll-view
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class="u-list"
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:scroll-into-view="scrollIntoView"
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:style="[listStyle]"
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:scroll-y="scrollable"
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:scroll-top="Number(scrollTop)"
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:lower-threshold="Number(lowerThreshold)"
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:upper-threshold="Number(upperThreshold)"
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:show-scrollbar="showScrollbar"
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:enable-back-to-top="enableBackToTop"
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:scroll-with-animation="scrollWithAnimation"
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@scroll="onScroll"
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@scrolltolower="scrolltolower"
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@scrolltoupper="scrolltoupper"
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:refresher-enabled="refresherEnabled"
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:refresher-threshold="refresherThreshold"
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:refresher-default-style="refresherDefaultStyle"
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:refresher-background="refresherBackground"
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:refresher-triggered="refresherTriggered"
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@refresherpulling="refresherpulling"
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@refresherrefresh="refresherrefresh"
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@refresherrestore="refresherrestore"
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@refresherabort="refresherabort"
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:scroll-anchoring="true"
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>
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<view>
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<slot />
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</view>
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</scroll-view>
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<!-- #endif -->
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</template>
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<script>
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import props from './props';
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import mpMixin from '../../libs/mixin/mpMixin';
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import mixin from '../../libs/mixin/mixin';
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import { addUnit, addStyle, deepMerge, sleep, sys } from '../../libs/function/index';
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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://ijry.github.io/uview-plus/components/list.html
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* @property {Boolean} showScrollbar 控制是否出现滚动条，仅nvue有效 （默认 false ）
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* @property {String ｜ Number} lowerThreshold 距底部多少时触发scrolltolower事件 （默认 50 ）
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* @property {String ｜ Number} upperThreshold 距顶部多少时触发scrolltoupper事件，非nvue有效 （默认 0 ）
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* @property {String ｜ Number} scrollTop 设置竖向滚动条位置（默认 0 ）
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* @property {String ｜ Number} offsetAccuracy 控制 onscroll 事件触发的频率，仅nvue有效（默认 10 ）
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* @property {Boolean} enableFlex 启用 flexbox 布局。开启后，当前节点声明了display: flex就会成为flex container，并作用于其孩子节点，仅微信小程序有效（默认 false ）
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* @property {Boolean} pagingEnabled 是否按分页模式显示List，（默认 false ）
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* @property {Boolean} scrollable 是否允许List滚动（默认 true ）
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* @property {String} scrollIntoView 值应为某子元素id（id不能以数字开头）
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* @property {Boolean} scrollWithAnimation 在设置滚动条位置时使用动画过渡 （默认 false ）
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* @property {Boolean} enableBackToTop iOS点击顶部状态栏、安卓双击标题栏时，滚动条返回顶部，只对微信小程序有效 （默认 false ）
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* @property {String ｜ Number} height 列表的高度 （默认 0 ）
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* @property {String ｜ Number} width 列表宽度 （默认 0 ）
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* @property {String ｜ Number} preLoadScreen 列表前后预渲染的屏数，1代表一个屏幕的高度，1.5代表1个半屏幕高度 （默认 1 ）
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* @property {Object} customStyle 定义需要用到的外部样式
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*
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* @example <u-list @scrolltolower="scrolltolower"></u-list>
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*/
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export default {
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name: 'u-list',
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mixins: [mpMixin, mixin, props],
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watch: {
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scrollIntoView(n) {
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this.scrollIntoViewById(n)
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}
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},
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data() {
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return {
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// 记录内部滚动的距离
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innerScrollTop: 0,
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// vue下，scroll-view在上拉加载时的偏移值
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offset: 0,
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sys: sys()
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}
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},
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computed: {
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listStyle() {
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const style = {};
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if (this.width != 0) style.width = addUnit(this.width)
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if (this.height != 0) style.height = addUnit(this.height)
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// 如果没有定义列表高度，则默认使用屏幕高度
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if (!style.height) style.height = addUnit(this.sys.windowHeight, 'px')
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return deepMerge(style, addStyle(this.customStyle))
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}
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},
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provide() {
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return {
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uList: this
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}
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},
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created() {
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this.refs = []
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this.children = []
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this.anchors = []
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},
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mounted() {},
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emits: ["scroll", "scrolltolower", "scrolltoupper",
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"refresherpulling", "refresherrefresh", "refresherrestore", "refresherabort"],
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methods: {
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updateOffsetFromChild(top) {
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this.offset = top
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},
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onScroll(e) {
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let scrollTop = 0
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// #ifdef APP-NVUE
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scrollTop = e.contentOffset.y
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// #endif
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// #ifndef APP-NVUE
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scrollTop = e.detail.scrollTop
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// #endif
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this.innerScrollTop = scrollTop
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this.$emit('scroll', Math.abs(scrollTop))
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},
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scrollIntoViewById(id) {
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// #ifdef APP-NVUE
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// 根据id参数，找到所有u-list-item中匹配的节点，再通过dom模块滚动到对应的位置
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const item = this.refs.find(item => item.$refs[id] ? true : false)
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dom.scrollToElement(item.$refs[id], {
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// 是否需要滚动动画
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animated: this.scrollWithAnimation
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})
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// #endif
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},
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// 滚动到底部触发事件
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scrolltolower(e) {
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sleep(30).then(() => {
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this.$emit('scrolltolower')
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})
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},
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// #ifndef APP-NVUE
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// 滚动到底部时触发，非nvue有效
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scrolltoupper(e) {
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sleep(30).then(() => {
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this.$emit('scrolltoupper')
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// 这一句很重要，能绝对保证在性功能障碍的webview，滚动条到顶时，取消偏移值，让页面置顶
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this.offset = 0
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})
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},
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refresherpulling(e) {
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this.$emit('refresherpulling', e)
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},
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refresherrefresh(e) {
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this.$emit('refresherrefresh', e)
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},
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refresherrestore(e) {
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this.$emit('refresherrestore', e)
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},
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refresherabort(e) {
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this.$emit('refresherabort', e)
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}
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// #endif
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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 {
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@include flex(column);
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}
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</style>
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