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244 lines
7.1 KiB
244 lines
7.1 KiB
<template> |
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<view class="u-skeleton"> |
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<view |
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class="u-skeleton__wrapper" |
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ref="u-skeleton__wrapper" |
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v-if="loading" |
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style="display: flex; flex-direction: row;" |
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> |
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<view |
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class="u-skeleton__wrapper__avatar" |
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v-if="avatar" |
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:class="[`u-skeleton__wrapper__avatar--${avatarShape}`, animate && 'animate']" |
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:style="{ |
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height: $u.addUnit(avatarSize), |
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width: $u.addUnit(avatarSize) |
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}" |
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></view> |
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<view |
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class="u-skeleton__wrapper__content" |
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ref="u-skeleton__wrapper__content" |
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style="flex: 1;" |
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> |
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<view |
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class="u-skeleton__wrapper__content__title" |
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v-if="title" |
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:style="{ |
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width: uTitleWidth, |
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height: $u.addUnit(titleHeight), |
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}" |
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:class="[animate && 'animate']" |
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></view> |
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<view |
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class="u-skeleton__wrapper__content__rows" |
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:class="[animate && 'animate']" |
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v-for="(item, index) in rowsArray" |
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:key="index" |
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:style="{ |
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width: item.width, |
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height: item.height, |
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marginTop: item.marginTop |
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}" |
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> |
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</view> |
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</view> |
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</view> |
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<slot v-else /> |
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</view> |
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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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// 由于weex为阿里的KPI业绩考核的产物,所以不支持百分比单位,这里需要通过dom查询组件的宽度 |
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const dom = uni.requireNativePlugin('dom') |
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const animation = uni.requireNativePlugin('animation') |
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// #endif |
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/** |
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* Skeleton 骨架屏 |
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* @description 骨架屏一般用于页面在请求远程数据尚未完成时,页面用灰色块预显示本来的页面结构,给用户更好的体验。 |
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* @tutorial https://www.uviewui.com/components/skeleton.html |
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* @property {Boolean} loading 是否显示骨架占位图,设置为false将会展示子组件内容 (默认 true ) |
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* @property {Boolean} animate 是否开启动画效果 (默认 true ) |
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* @property {String | Number} rows 段落占位图行数 (默认 0 ) |
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* @property {String | Number | Array} rowsWidth 段落占位图的宽度,可以为百分比,数值,带单位字符串等,可通过数组传入指定每个段落行的宽度 (默认 '100%' ) |
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* @property {String | Number | Array} rowsHeight 段落的高度 (默认 18 ) |
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* @property {Boolean} title 是否展示标题占位图 (默认 true ) |
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* @property {String | Number} titleWidth 标题的宽度 (默认 '50%' ) |
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* @property {String | Number} titleHeight 标题的高度 (默认 18 ) |
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* @property {Boolean} avatar 是否展示头像占位图 (默认 false ) |
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* @property {String | Number} avatarSize 头像占位图大小 (默认 32 ) |
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* @property {String} avatarShape 头像占位图的形状,circle-圆形,square-方形 (默认 'circle' ) |
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* @example <u-search placeholder="日照香炉生紫烟" v-model="keyword"></u-search> |
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*/ |
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export default { |
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name: 'u-skeleton', |
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mixins: [uni.$u.mpMixin, uni.$u.mixin, props], |
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data() { |
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return { |
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width: 0, |
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} |
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}, |
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watch: { |
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loading() { |
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this.getComponentWidth() |
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} |
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}, |
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computed: { |
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rowsArray() { |
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if (/%$/.test(this.rowsHeight)) { |
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uni.$u.error('rowsHeight参数不支持百分比单位') |
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} |
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const rows = [] |
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for (let i = 0; i < this.rows; i++) { |
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let item = {}, |
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// 需要预防超出数组边界的情况 |
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rowWidth = uni.$u.test.array(this.rowsWidth) ? (this.rowsWidth[i] || (i === this.row - 1 ? '70%' : '100%')) : i === |
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this.rows - 1 ? '70%' : this.rowsWidth, |
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rowHeight = uni.$u.test.array(this.rowsHeight) ? (this.rowsHeight[i] || '18px') : this.rowsHeight |
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// 如果有title占位图,第一个段落占位图的外边距需要大一些,如果没有title占位图,第一个段落占位图则无需外边距 |
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// 之所以需要这么做,是因为weex的无能,以提升性能为借口不支持css的一些伪类 |
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item.marginTop = !this.title && i === 0 ? 0 : this.title && i === 0 ? '20px' : '12px' |
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// 如果设置的为百分比的宽度,转换为px值,因为nvue不支持百分比单位 |
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if (/%$/.test(rowWidth)) { |
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// 通过parseInt提取出百分比单位中的数值部分,除以100得到百分比的小数值 |
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item.width = uni.$u.addUnit(this.width * parseInt(rowWidth) / 100) |
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} else { |
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item.width = uni.$u.addUnit(rowWidth) |
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} |
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item.height = uni.$u.addUnit(rowHeight) |
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rows.push(item) |
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} |
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// console.log(rows); |
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return rows |
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}, |
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uTitleWidth() { |
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let tWidth = 0 |
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if (/%$/.test(this.titleWidth)) { |
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// 通过parseInt提取出百分比单位中的数值部分,除以100得到百分比的小数值 |
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tWidth = uni.$u.addUnit(this.width * parseInt(this.titleWidth) / 100) |
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} else { |
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tWidth = uni.$u.addUnit(this.titleWidth) |
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} |
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return uni.$u.addUnit(tWidth) |
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}, |
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}, |
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mounted() { |
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this.init() |
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}, |
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methods: { |
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init() { |
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this.getComponentWidth() |
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// #ifdef APP-NVUE |
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this.loading && this.animate && this.setNvueAnimation() |
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// #endif |
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}, |
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async setNvueAnimation() { |
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// #ifdef APP-NVUE |
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// 为了让opacity:1的状态保持一定时间,这里做一个延时 |
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await uni.$u.sleep(500) |
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const skeleton = this.$refs['u-skeleton__wrapper']; |
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skeleton && this.loading && this.animate && animation.transition(skeleton, { |
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styles: { |
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opacity: 0.5 |
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}, |
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duration: 600, |
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}, () => { |
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// 这里无需判断是否loading和开启动画状态,因为最终的状态必须达到opacity: 1,否则可能 |
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// 会停留在opacity: 0.5的状态中 |
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animation.transition(skeleton, { |
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styles: { |
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opacity: 1 |
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}, |
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duration: 600, |
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}, () => { |
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// 只有在loading中时,才执行动画 |
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this.loading && this.animate && this.setNvueAnimation() |
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}) |
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}) |
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// #endif |
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}, |
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// 获取组件的宽度 |
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async getComponentWidth() { |
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// 延时一定时间,以获取dom尺寸 |
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await uni.$u.sleep(20) |
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// #ifndef APP-NVUE |
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this.$uGetRect('.u-skeleton__wrapper__content').then(size => { |
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this.width = size.width |
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}) |
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// #endif |
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// #ifdef APP-NVUE |
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const ref = this.$refs['u-skeleton__wrapper__content'] |
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ref && dom.getComponentRect(ref, (res) => { |
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this.width = 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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@mixin background { |
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/* #ifdef APP-NVUE */ |
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background-color: #F1F2F4; |
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/* #endif */ |
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/* #ifndef APP-NVUE */ |
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background: linear-gradient(90deg, #F1F2F4 25%, #e6e6e6 37%, #F1F2F4 50%); |
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background-size: 400% 100%; |
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/* #endif */ |
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} |
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.u-skeleton { |
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flex: 1; |
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&__wrapper { |
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@include flex(row); |
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&__avatar { |
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@include background; |
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margin-right: 15px; |
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&--circle { |
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border-radius: 100px; |
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} |
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&--square { |
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border-radius: 4px; |
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} |
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} |
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&__content { |
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flex: 1; |
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&__rows, |
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&__title { |
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@include background; |
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border-radius: 3px; |
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} |
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} |
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} |
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} |
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/* #ifndef APP-NVUE */ |
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.animate { |
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animation: skeleton 1.8s ease infinite |
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} |
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@keyframes skeleton { |
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0% { |
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background-position: 100% 50% |
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} |
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100% { |
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background-position: 0 50% |
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} |
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} |
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/* #endif */ |
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</style>
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