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129 lines
3.7 KiB
129 lines
3.7 KiB
<template> |
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<u-transition |
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mode="fade" |
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:customStyle="backTopStyle" |
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:show="show" |
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> |
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<view |
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class="u-back-top" |
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:style="[contentStyle]" |
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v-if="!$slots.default && !$slots.$default" |
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@click="backToTop" |
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> |
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<u-icon |
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:name="icon" |
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:custom-style="iconStyle" |
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></u-icon> |
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<text |
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v-if="text" |
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class="u-back-top__text" |
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>{{text}}</text> |
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</view> |
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<slot v-else /> |
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</u-transition> |
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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 = weex.requireModule('dom') |
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// #endif |
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/** |
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* backTop 返回顶部 |
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* @description 本组件一个用于长页面,滑动一定距离后,出现返回顶部按钮,方便快速返回顶部的场景。 |
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* @tutorial https://uviewui.com/components/backTop.html |
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* |
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* @property {String} mode 返回顶部的形状,circle-圆形,square-方形 (默认 'circle' ) |
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* @property {String} icon 自定义图标 (默认 'arrow-upward' ) 见官方文档示例 |
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* @property {String} text 提示文字 |
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* @property {String | Number} duration 返回顶部滚动时间 (默认 100) |
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* @property {String | Number} scrollTop 滚动距离 (默认 0 ) |
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* @property {String | Number} top 距离顶部多少距离显示,单位px (默认 400 ) |
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* @property {String | Number} bottom 返回顶部按钮到底部的距离,单位px (默认 100 ) |
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* @property {String | Number} right 返回顶部按钮到右边的距离,单位px (默认 20 ) |
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* @property {String | Number} zIndex 层级 (默认 9 ) |
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* @property {Object<Object>} iconStyle 图标的样式,对象形式 (默认 {color: '#909399',fontSize: '19px'}) |
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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-back-top :scrollTop="scrollTop"></u-back-top> |
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*/ |
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export default { |
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name: 'u-back-top', |
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mixins: [uni.$u.mpMixin, uni.$u.mixin,props], |
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computed: { |
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backTopStyle() { |
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// 动画组件样式 |
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const style = { |
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bottom: uni.$u.addUnit(this.bottom), |
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right: uni.$u.addUnit(this.right), |
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width: '40px', |
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height: '40px', |
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position: 'fixed', |
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zIndex: 10, |
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} |
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return style |
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}, |
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show() { |
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return uni.$u.getPx(this.scrollTop) > uni.$u.getPx(this.top) |
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}, |
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contentStyle() { |
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const style = {} |
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let radius = 0 |
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// 是否圆形 |
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if(this.mode === 'circle') { |
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radius = '100px' |
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} else { |
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radius = '4px' |
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} |
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// 为了兼容安卓nvue,只能这么分开写 |
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style.borderTopLeftRadius = radius |
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style.borderTopRightRadius = radius |
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style.borderBottomLeftRadius = radius |
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style.borderBottomRightRadius = radius |
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return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle)) |
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} |
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}, |
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methods: { |
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backToTop() { |
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// #ifdef APP-NVUE |
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if (!this.$parent.$refs['u-back-top']) { |
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uni.$u.error(`nvue页面需要给页面最外层元素设置"ref='u-back-top'`) |
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} |
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dom.scrollToElement(this.$parent.$refs['u-back-top'], { |
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offset: 0 |
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}) |
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// #endif |
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// #ifndef APP-NVUE |
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uni.pageScrollTo({ |
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scrollTop: 0, |
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duration: this.duration |
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}); |
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// #endif |
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this.$emit('click') |
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} |
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} |
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} |
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</script> |
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<style lang="scss" scoped> |
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@import '../../libs/css/components.scss'; |
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$u-back-top-flex:1 !default; |
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$u-back-top-height:100% !default; |
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$u-back-top-background-color:#E1E1E1 !default; |
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$u-back-top-tips-font-size:12px !default; |
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.u-back-top { |
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@include flex; |
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flex-direction: column; |
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align-items: center; |
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flex:$u-back-top-flex; |
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height: $u-back-top-height; |
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justify-content: center; |
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background-color: $u-back-top-background-color; |
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&__tips { |
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font-size:$u-back-top-tips-font-size; |
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transform: scale(0.8); |
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} |
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} |
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</style>
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