<template>
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<view
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class="u-scroll-list"
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ref="u-scroll-list"
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>
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<!-- #ifdef APP-NVUE -->
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<!-- nvue使用bindingX实现，以得到更好的性能 -->
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<scroller
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class="u-scroll-list__scroll-view"
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ref="u-scroll-list__scroll-view"
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scroll-direction="horizontal"
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:show-scrollbar="false"
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:offset-accuracy="1"
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@scroll="nvueScrollHandler"
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>
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<view class="u-scroll-list__scroll-view__content">
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<slot />
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</view>
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</scroller>
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<!-- #endif -->
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<!-- #ifndef APP-NVUE -->
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<!-- #ifdef MP-WEIXIN || APP-VUE || H5 || MP-QQ -->
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<!-- 以上平台，支持wxs -->
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<scroll-view
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class="u-scroll-list__scroll-view"
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scroll-x
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@scroll="wxs.scroll"
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@scrolltoupper="wxs.scrolltoupper"
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@scrolltolower="wxs.scrolltolower"
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:data-scrollWidth="scrollWidth"
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:data-barWidth="$u.getPx(indicatorBarWidth)"
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:data-indicatorWidth="$u.getPx(indicatorWidth)"
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:show-scrollbar="false"
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:upper-threshold="0"
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:lower-threshold="0"
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>
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<!-- #endif -->
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<!-- #ifndef APP-NVUE || MP-WEIXIN || H5 || APP-VUE || MP-QQ -->
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<!-- 非以上平台，只能使用普通js实现 -->
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<scroll-view
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class="u-scroll-list__scroll-view"
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scroll-x
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@scroll="scrollHandler"
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@scrolltoupper="scrolltoupperHandler"
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@scrolltolower="scrolltolowerHandler"
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:show-scrollbar="false"
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:upper-threshold="0"
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:lower-threshold="0"
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>
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<!-- #endif -->
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<view class="u-scroll-list__scroll-view__content">
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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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<view
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class="u-scroll-list__indicator"
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v-if="indicator"
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:style="[$u.addStyle(indicatorStyle)]"
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>
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<view
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class="u-scroll-list__indicator__line"
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:style="[lineStyle]"
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>
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<view
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class="u-scroll-list__indicator__line__bar"
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:style="[barStyle]"
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ref="u-scroll-list__indicator__line__bar"
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></view>
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</view>
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</view>
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</view>
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</template>
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<script
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src="./scrollWxs.wxs"
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module="wxs"
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lang="wxs"
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></script>
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<script>
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/**
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* scrollList 横向滚动列表
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* @description 该组件一般用于同时展示多个商品、分类的场景，也可以完成左右滑动的列表。
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* @tutorial https://www.uviewui.com/components/scrollList.html
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* @property {String | Number} indicatorWidth 指示器的整体宽度 (默认 50 )
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* @property {String | Number} indicatorBarWidth 滑块的宽度 (默认 20 )
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* @property {Boolean} indicator 是否显示面板指示器 (默认 true )
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* @property {String} indicatorColor 指示器非激活颜色 (默认 '#f2f2f2' )
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* @property {String} indicatorActiveColor 指示器的激活颜色 (默认 '#3c9cff' )
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* @property {String | Object} indicatorStyle 指示器样式，可通过bottom，left，right进行定位
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* @event {Function} left 滑动到左边时触发
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* @event {Function} right 滑动到右边时触发
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* @example
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*/
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// #ifdef APP-NVUE
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const dom = uni.requireNativePlugin('dom')
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import nvueMixin from "./nvue.js"
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// #endif
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import props from './props.js';
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export default {
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name: 'u-scroll-list',
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mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
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// #ifdef APP-NVUE
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mixins: [uni.$u.mpMixin, uni.$u.mixin, nvueMixin, props],
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// #endif
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data() {
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return {
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scrollInfo: {
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scrollLeft: 0,
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scrollWidth: 0
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},
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scrollWidth: 0
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}
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},
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computed: {
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// 指示器为线型的样式
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barStyle() {
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const style = {}
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// #ifndef APP-NVUE || MP-WEIXIN || H5 || APP-VUE || MP-QQ
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// 此为普通js方案，只有在非nvue和不支持wxs方案的端才使用、
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// 此处的计算理由为：scroll-view的滚动距离与目标滚动距离(scroll-view的实际宽度减去包裹元素的宽度)之比，等于滑块当前移动距离与总需
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// 滑动距离(指示器的总宽度减去滑块宽度)的比值
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const scrollLeft = this.scrollInfo.scrollLeft,
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scrollWidth = this.scrollInfo.scrollWidth,
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barAllMoveWidth = this.indicatorWidth - this.indicatorBarWidth
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const x = scrollLeft / (scrollWidth - this.scrollWidth) * barAllMoveWidth
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style.transform = `translateX(${ x }px)`
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// #endif
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// 设置滑块的宽度和背景色，是每个平台都需要的
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style.width = uni.$u.addUnit(this.indicatorBarWidth)
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style.backgroundColor = this.indicatorActiveColor
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return style
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},
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lineStyle() {
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const style = {}
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// 指示器整体的样式，需要设置其宽度和背景色
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style.width = uni.$u.addUnit(this.indicatorWidth)
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style.backgroundColor = this.indicatorColor
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return style
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}
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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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this.getComponentWidth()
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},
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// #ifndef APP-NVUE || MP-WEIXIN || H5 || APP-VUE || MP-QQ
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// scroll-view触发滚动事件
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scrollHandler(e) {
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this.scrollInfo = e.detail
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},
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scrolltoupperHandler() {
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this.scrollEvent('left')
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this.scrollInfo.scrollLeft = 0
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},
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scrolltolowerHandler() {
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this.scrollEvent('right')
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// 在普通js方案中，滚动到右边时，通过设置this.scrollInfo，模拟出滚动到右边的情况
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// 因为上方是用过computed计算的，设置后，会自动调整滑块的位置
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this.scrollInfo.scrollLeft = uni.$u.getPx(this.indicatorWidth) - uni.$u.getPx(this.indicatorBarWidth)
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},
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// #endif
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//
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scrollEvent(status) {
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this.$emit(status)
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},
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// 获取组件的宽度
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async getComponentWidth() {
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// 延时一定时间，以获取dom尺寸
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await uni.$u.sleep(30)
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// #ifndef APP-NVUE
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this.$uGetRect('.u-scroll-list').then(size => {
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this.scrollWidth = size.width
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})
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// #endif
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// #ifdef APP-NVUE
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const ref = this.$refs['u-scroll-list']
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ref && dom.getComponentRect(ref, (res) => {
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this.scrollWidth = res.size.width
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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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</script>
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<style lang="scss" scoped>
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@import "../../libs/css/components.scss";
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.u-scroll-list {
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padding-bottom: 10px;
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&__scroll-view {
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@include flex;
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&__content {
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@include flex;
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}
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}
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&__indicator {
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@include flex;
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justify-content: center;
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margin-top: 15px;
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&__line {
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width: 60px;
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height: 4px;
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border-radius: 100px;
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overflow: hidden;
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&__bar {
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width: 20px;
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height: 4px;
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border-radius: 100px;
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}
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}
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}
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}
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</style>
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