You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
154 lines
3.3 KiB
154 lines
3.3 KiB
11 months ago
|
<template>
|
||
|
|
<view @tap="backToTop" class="u-back-top" :class="['u-back-top--mode--' + mode]" :style="[{
|
||
|
|
bottom: bottom + 'rpx',
|
||
|
|
right: right + 'rpx',
|
||
|
|
borderRadius: mode == 'circle' ? '10000rpx' : '8rpx',
|
||
|
|
zIndex: uZIndex,
|
||
|
|
opacity: opacity
|
||
|
|
}, customStyle]">
|
||
|
|
<view class="u-back-top__content" v-if="!$slots.default && !$slots.$default">
|
||
|
|
<u-icon @click="backToTop" :name="icon" :custom-style="iconStyle"></u-icon>
|
||
|
|
<view class="u-back-top__content__tips">
|
||
|
|
{{tips}}
|
||
|
|
</view>
|
||
|
|
</view>
|
||
|
|
<slot v-else />
|
||
|
|
</view>
|
||
|
|
</template>
|
||
|
|
|
||
|
|
<script>
|
||
|
|
export default {
|
||
|
|
name: 'u-back-top',
|
||
|
|
props: {
|
||
|
|
// 返回顶部的形状，circle-圆形，square-方形
|
||
|
|
mode: {
|
||
|
|
type: String,
|
||
|
|
default: 'circle'
|
||
|
|
},
|
||
|
|
// 自定义图标
|
||
|
|
icon: {
|
||
|
|
type: String,
|
||
|
|
default: 'arrow-upward'
|
||
|
|
},
|
||
|
|
// 提示文字
|
||
|
|
tips: {
|
||
|
|
type: String,
|
||
|
|
default: ''
|
||
|
|
},
|
||
|
|
// 返回顶部滚动时间
|
||
|
|
duration: {
|
||
|
|
type: [Number, String],
|
||
|
|
default: 100
|
||
|
|
},
|
||
|
|
// 滚动距离
|
||
|
|
scrollTop: {
|
||
|
|
type: [Number, String],
|
||
|
|
default: 0
|
||
|
|
},
|
||
|
|
// 距离顶部多少距离显示，单位rpx
|
||
|
|
top: {
|
||
|
|
type: [Number, String],
|
||
|
|
default: 400
|
||
|
|
},
|
||
|
|
// 返回顶部按钮到底部的距离，单位rpx
|
||
|
|
bottom: {
|
||
|
|
type: [Number, String],
|
||
|
|
default: 200
|
||
|
|
},
|
||
|
|
// 返回顶部按钮到右边的距离，单位rpx
|
||
|
|
right: {
|
||
|
|
type: [Number, String],
|
||
|
|
default: 40
|
||
|
|
},
|
||
|
|
// 层级
|
||
|
|
zIndex: {
|
||
|
|
type: [Number, String],
|
||
|
|
default: '9'
|
||
|
|
},
|
||
|
|
// 图标的样式，对象形式
|
||
|
|
iconStyle: {
|
||
|
|
type: Object,
|
||
|
|
default() {
|
||
|
|
return {
|
||
|
|
color: '#909399',
|
||
|
|
fontSize: '38rpx'
|
||
|
|
}
|
||
|
|
}
|
||
|
|
},
|
||
|
|
// 整个组件的样式
|
||
|
|
customStyle: {
|
||
|
|
type: Object,
|
||
|
|
default() {
|
||
|
|
return {}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
},
|
||
|
|
watch: {
|
||
|
|
showBackTop(nVal, oVal) {
|
||
|
|
// 当组件的显示与隐藏状态发生跳变时，修改组件的层级和不透明度
|
||
|
|
// 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
|
||
|
|
if(nVal) {
|
||
|
|
this.uZIndex = this.zIndex;
|
||
|
|
this.opacity = 1;
|
||
|
|
} else {
|
||
|
|
this.uZIndex = -1;
|
||
|
|
this.opacity = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
},
|
||
|
|
computed: {
|
||
|
|
showBackTop() {
|
||
|
|
// 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
|
||
|
|
// 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
|
||
|
|
return this.scrollTop > uni.upx2px(this.top);
|
||
|
|
},
|
||
|
|
},
|
||
|
|
data() {
|
||
|
|
return {
|
||
|
|
// 不透明度，为了让组件有一个显示和隐藏的过渡动画
|
||
|
|
opacity: 0,
|
||
|
|
// 组件的z-index值，隐藏时设置为-1，就会看不到
|
||
|
|
uZIndex: -1
|
||
|
|
}
|
||
|
|
},
|
||
|
|
methods: {
|
||
|
|
backToTop() {
|
||
|
|
uni.pageScrollTo({
|
||
|
|
scrollTop: 0,
|
||
|
|
duration: this.duration
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
</script>
|
||
|
|
|
||
|
|
<style lang="scss" scoped>
|
||
|
|
@import "../../libs/css/style.components.scss";
|
||
|
|
|
||
|
|
.u-back-top {
|
||
|
|
width: 80rpx;
|
||
|
|
height: 80rpx;
|
||
|
|
position: fixed;
|
||
|
|
z-index: 9;
|
||
|
|
@include vue-flex;
|
||
|
|
flex-direction: column;
|
||
|
|
justify-content: center;
|
||
|
|
background-color: #E1E1E1;
|
||
|
|
color: $u-content-color;
|
||
|
|
align-items: center;
|
||
|
|
transition: opacity 0.4s;
|
||
|
|
|
||
|
|
&__content {
|
||
|
|
@include vue-flex;
|
||
|
|
flex-direction: column;
|
||
|
|
align-items: center;
|
||
|
|
|
||
|
|
&__tips {
|
||
|
|
font-size: 24rpx;
|
||
|
|
transform: scale(0.8);
|
||
|
|
line-height: 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
</style>
|