<template lang="html">
<div class="load-moudle" @touchstart="touchStart($event)" @touchmove="touchMove($event)" @touchend="touchend($event)">
<slot></slot>
<footer class="load-more">
<slot name="load-more">
<div class="more-tip" v-if="pullUpState==1">
<span class="more-text">{{pullUpInfo.moreText}}</span>
</div>
<div class="loading-tip" v-if="pullUpState==2">
<span class="loading-icon"></span>
<span class="loading-text">{{pullUpInfo.loadingText}}</span>
</div>
<div class="no-more-tip" v-if="pullUpState==3">
<span class="connecting-line"></span>
<span class="no-more-text">{{pullUpInfo.noMoreText}}</span>
<span class="connecting-line"></span>
</div>
</slot>
</footer>
</div>
</template>
<script>
export default {
props: {
parentPullUpState: {
default: 0
},
onInfiniteLoad: {
type: Function,
require: false
}
},
data () {
return {
top: 0,
pullUpState: 0, // 1:上拉加载更多, 2:加载中……, 3:我是有底线的
isLoading: false, // 是否正在加载
pullUpInfo: {
moreText: '上拉加载更多',
loadingText: '加载中...',
noMoreText: '我是有底线的'
},
startX: 0,
startY: 0,
endX: 0,
endY: 0
}
},
created () {
// console.log(this.pullUpState)
},
methods: {
/**
* 触摸开始，手指点击屏幕时
* @param {object} e Touch 对象包含的属性
*/
touchStart (e) {
this.startX = e.touches[0].pageX
this.startY = e.touches[0].pageY
},
/**
* 接触点改变，滑动时
* @param {object} e Touch 对象包含的属性
*/
touchMove (e) {
this.endX = e.changedTouches[0].pageX
this.endY = e.changedTouches[0].pageY
let direction = this.getSlideDirection(this.startX, this.startY, this.endX, this.endY)
switch (direction) {
case 0:
// console.log('没滑动')
break
case 1:
// console.log('向上')
this.scrollToTheEnd()
break
case 2:
// console.log('向下')
break
case 3:
// console.log('向左')
break
case 4:
// console.log('向右')
break
default:
}
},
/**
* 触摸结束，手指离开屏幕时
* @param {object} e Touch 对象包含的属性
*/
touchend (e) {
this.isLoading = false
},
/**
* 判断滚动条是否到底
*/
scrollToTheEnd () {
let innerHeight = document.querySelector('.load-moudle').clientHeight
// 变量scrollTop是滚动条滚动时，距离顶部的距离
let scrollTop = document.documentElement.scrollTop || window.pageYOffset || document.body.scrollTop
// 变量scrollHeight是滚动条的总高度
let scrollHeight = document.documentElement.clientHeight || document.body.scrollHeight
// 滚动条到底部的条件
if (scrollTop + scrollHeight >= innerHeight) {
if (this.pullUpState !== 3 && !this.isLoading) {
this.infiniteLoad()
}
// console.log('距顶部' + scrollTop + '滚动条总高度' + scrollHeight + '内容高度' + innerHeight)
}
},
/**
* 上拉加载数据
*/
infiniteLoad () {
if (this.pullUpState !== 0) {
this.pullUpState = 2
this.isLoading = true
this.onInfiniteLoad(this.infiniteLoadDone)
}
},
/**
* 加载数据完成
*/
infiniteLoadDone () {
this.pullUpState = 1
},
/**
* 返回角度
*/
getSlideAngle (dx, dy) {
return Math.atan2(dy, dx) * 180 / Math.PI
},
/**
* 根据起点和终点返回方向 1：向上，2：向下，3：向左，4：向右,0：未滑动
* @param {number} startX X轴开始位置
* @param {number} startY X轴结束位置
* @param {number} endX Y轴开始位置
* @param {number} endY Y轴结束位置
*/
getSlideDirection (startX, startY, endX, endY) {
let dy = startY - endY
let dx = endX - startX
let result = 0
// 如果滑动距离太短
if (Math.abs(dx) < 2 && Math.abs(dy) < 2) {
return result
}
let angle = this.getSlideAngle(dx, dy)
if (angle >= -45 && angle < 45) {
result = 4
} else if (angle >= 45 && angle < 135) {
result = 1
} else if (angle >= -135 && angle < -45) {
result = 2
} else if ((angle >= 135 && angle <= 180) || (angle >= -180 && angle < -135)) {
result = 3
}
return result
}
},
watch: {
parentPullUpState (curVal, oldVal) {
this.pullUpState = curVal
}
}
}
</script>
<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
.load-more {
width: 100%;
color: #c0c0c0;
background: #fafafa;
font-size: 14px;
}
.no-more-text {
display: block;
width: 150px;
}
.more-tip,
.loading-tip,
.no-more-tip {
display: flex;
align-items: center;
justify-content: center;
height: 150px;
}
.load-moudle .loading-icon {
display: inline-flex;
width: 35px;
height: 35px;
background: url('../../assets/loading.png') no-repeat;
background-size: cover;
margin-right: 5px;
animation: rotating 2s linear infinite;
}
@keyframes rotating {
0% {
transform: rotate(0deg);
}
100% {
transform: rotate(1turn);
}
}
.connecting-line {
display: inline-flex;
width: 150px;
height: 2px;
background: #ddd;
margin-left: 20px;
margin-right: 20px;
}
</style>
在父组件---引入使用：
<v-reload
:on-infinite-load="onInfiniteLoad"
:parent-pull-up-state="infiniteLoadData.pullUpState"
>
<''列表内容‘’>
</v-reload>
data(){
return{
infiniteLoadData: {
initialShowNum: 3, // 初始显示多少条
everyLoadingNum: 3, // 每次加载的个数
pullUpState: 2, // 子组件的pullUpState状态
pullUpList: [], // 上拉加载更多数据的数组
showPullUpListLength: this.initialShowNum // 上拉加载后所展示的个数
},
}
merhods:{
onInfiniteLoad (done) {
console.log(done, this.infiniteLoadData.pullUpState)
if (this.infiniteLoadData.pullUpState === 1) {
this.getSiteInfo() //获取列表数据的函数
}
done()
}
