141 lines
4.0 KiB
Vue
141 lines
4.0 KiB
Vue
<template>
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<view
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@tap="backToTop"
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class="u-back-top"
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:class="['u-back-top--mode--' + mode, customClass]"
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:style="
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$u.toStyle(
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{
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bottom: bottom + 'rpx',
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right: right + 'rpx',
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borderRadius: mode == 'circle' ? '10000rpx' : '8rpx',
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zIndex: uZIndex,
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opacity: opacity
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},
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customStyle
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)
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"
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>
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<view class="u-back-top__content" v-if="!slots.default">
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<u-icon @click="backToTop" :name="icon" :custom-style="iconStyle"></u-icon>
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<view class="u-back-top__content__tips">
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{{ tips }}
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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 lang="ts">
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export default {
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name: 'u-back-top',
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options: {
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addGlobalClass: true,
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// #ifndef MP-TOUTIAO
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virtualHost: true,
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// #endif
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styleIsolation: 'shared'
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}
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};
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</script>
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<script setup lang="ts">
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import { ref, computed, watch, useSlots } from 'vue';
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import { BackTopProps } from './types';
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import { $u } from '../../';
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/**
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* back-top 返回顶部按钮
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* @description 页面滚动时显示的返回顶部按钮
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* @property {String} mode 返回顶部的形状，circle-圆形，square-方形
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* @property {String} icon 自定义图标
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* @property {String} tips 提示文字
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* @property {Number|String} duration 返回顶部滚动时间
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* @property {Number|String} scrollTop 滚动距离
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* @property {Number|String} top 距离顶部多少距离显示，单位rpx
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* @property {Number|String} bottom 返回顶部按钮到底部的距离，单位rpx
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* @property {Number|String} right 返回顶部按钮到右边的距离，单位rpx
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* @property {Number|String} zIndex 层级
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* @property {Object} iconStyle 图标的样式，对象形式
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* @property {Object} customStyle 整个组件的样式
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*/
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const props = defineProps(BackTopProps);
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const slots = useSlots();
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// 不透明度，为了让组件有一个显示和隐藏的过渡动画
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const opacity = ref(0);
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// 组件的z-index值，隐藏时设置为-1，就会看不到
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const uZIndex = ref(-1);
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/**
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* 计算是否显示返回顶部按钮
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* 由于scrollTop为页面的滚动距离，默认为px单位，这里将用于传入的top(rpx)值
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* 转为px用于比较，如果滚动条到顶的距离大于设定的距离，就显示返回顶部的按钮
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*/
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const showBackTop = computed(() => {
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// uni.upx2px 用于将 rpx 转为 px
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return (
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Number(props.scrollTop) >
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(typeof uni !== 'undefined' && uni.upx2px ? uni.upx2px(Number(props.top)) : Number(props.top))
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);
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// #else
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// return Number(props.scrollTop) > Number(props.top)
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});
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// 监听组件的显示与隐藏状态，修改组件的层级和不透明度
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// 让组件有显示和消失的动画效果，如果用v-if控制组件状态，将无设置动画效果
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watch(showBackTop, nVal => {
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if (nVal) {
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uZIndex.value = Number(props.zIndex);
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opacity.value = 1;
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} else {
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uZIndex.value = -1;
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opacity.value = 0;
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}
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});
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/**
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* 返回顶部方法
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*/
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function backToTop() {
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// uni.pageScrollTo 用于页面滚动到顶部
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if (typeof uni !== 'undefined' && uni.pageScrollTo) {
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uni.pageScrollTo({
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scrollTop: 0,
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duration: Number(props.duration)
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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/style.components.scss';
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.u-back-top {
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width: 80rpx;
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height: 80rpx;
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position: fixed;
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z-index: 9;
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@include vue-flex;
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flex-direction: column;
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justify-content: center;
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background-color: var(--u-divider-color);
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color: $u-content-color;
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align-items: center;
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transition: opacity 0.4s;
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&__content {
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@include vue-flex;
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flex-direction: column;
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align-items: center;
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&__tips {
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font-size: 24rpx;
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transform: scale(0.8);
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line-height: 1;
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}
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}
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}
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</style>
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