gree_leran/node_modules/uview-plus/components/u-back-top/u-back-top.vue

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