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<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';
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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, getPx, deepMerge, error } from '../../libs/function/index';
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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://uview-plus.jiangruyi.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: [mpMixin, 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: addUnit(this.bottom),
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right: 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 getPx(this.scrollTop) > 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 deepMerge(style, addStyle(this.customStyle))
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}
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},
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emits: ["click"],
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methods: {
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backToTop() {
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// #ifdef APP-NVUE
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if (!this.$parent.$refs['u-back-top']) {
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error(`nvue页面需要给页面最外层元素设置"ref='u-back-top'`)
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}
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dom.scrollToElement(this.$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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