無限滾動列表：分為單步滾動和迴圈滾動兩種方式
<template>
<div class="box" :style="{width:widthX,height:heightY}"
@mouseenter="mEnter" @mouseleave="mLeave"
>
<div
class="indefiniteScroll"
:style="{width:widthX,height:heightY,transform:`translateY(${top+'px'})`}"
>
<slot></slot>
</div>
<div
v-if="isFull"
class="indefiniteScroll"
:style="{width:widthX,height:heightY,transform:`translateY(${top2+'px'})`}"
>
<slot></slot>
</div>
</div>
</template>
<script lang="ts">
import {
defineComponent,
ref,
watch,
onUnmounted,
onMounted,
reactive,
} from "vue";
export default defineComponent({
props:{
width:{ // 盒子寬
type: [Number,String],
default: '400'
},
height:{ // 盒子高
type: [Number,String],
default: '300'
},
scrollList: { // 資料列表
type: Array,
default: []
},
direction:{ // 滾動方向 top | bottom
type: String,
defauilt: 'top'
},
moveType:{ // 滾動型別，0:預設，1:單步停頓
type: [Number,String],
default: 0
},
speed:{ // 速度1-5
type: [Number,String],
default: 1
},
pauseTime:{ // 停頓時間
type: [Number,String],
default: 300
},
singleHeight:{
// 單行高度
type: [Number,String],
default: 30
}
},
setup(props,context){
let widthX:any = ref('')
let heightY:any = ref('')
let top:any = ref('0')
let top2:any = ref('0')
let timer:any = ref(null)
let dis:any = ref(0)
let options:any = reactive({
direction: 'top',
moveType: 0, // 0預設滾動，1單步停頓
speed: 1,
})
let isFull = ref(true) // 資料是否充滿盒子
let isIn = false
onMounted(()=>{
methods.getXY()
methods.setOption()
if(Number(props.singleHeight)*props.scrollList.length<=Number(props.height)){
// 如果傳入的資料沒有佔滿盒子就不滾動
isFull.value = false
return
} else {
isFull.value = true
methods.scroll('','')
}
})
watch(()=>props.scrollList,()=>{ if(timer) {
window.cancelAnimationFrame(timer)
if(options.direction == 'top') {
top.value = '0'
top2.value = Number(props.singleHeight)*props.scrollList.length - Number(props.height) // 初始位置
} else {
top.value = -Number(props.singleHeight)*props.scrollList.length
top2.value = -Number(props.height) // 初始位置
}
}
if(Number(props.singleHeight)*props.scrollList.length<=Number(props.height)){
// 如果傳入的資料沒有佔滿盒子就不滾動
isFull.value = false
return
} else {
isFull.value = true
methods.scroll('','')
}
},{
deep:true,
})
onUnmounted(()=>{
if(timer) {
window.cancelAnimationFrame(timer)
}
})
let methods = {
getXY(){ // 盒子寬高
widthX.value = props.width + 'px'
heightY.value = props.height + 'px'
},
setOption(){ // 引數設定
options.direction = props.direction
options.moveType = Number(props.moveType)
if(props.speed<1){ // 限制速度
options.speed = 1
} else if(props.speed>5){
options.speed = 5
} else {
options.speed = Number(props.speed)
}
},
scroll(currentTop:string,currentTop2:string){ // 滾動
if(options.direction == "bottom"){ // 初始位置
if(currentTop){
top.value = currentTop // 滑鼠移入移出位置
top2.value = currentTop2 // 初始位置
} else {
top.value = -Number(props.singleHeight)*props.scrollList.length
top2.value = -Number(props.height) // 初始位置
}
} else {
if(currentTop2){
top2.value = currentTop2
} else {
top2.value = Number(props.singleHeight)*props.scrollList.length - Number(props.height) // 初始位置
}
}
switch(options.moveType){
case 0:
if(options.direction == "top") {
methods.baseMoveTop()
} else if(options.direction == "bottom"){
methods.baseMoveBottom()
}
break
case 1:
if(options.direction == "top") {
methods.singleMoveTop()
} else if(options.direction == "bottom"){
methods.singleMoveBottom()
}
break
}
},
mEnter(){ // 滑鼠移入
if(isFull.value) isIn = true
},
mLeave(){ // 滑鼠移出
if(isFull.value){
isIn = false
methods.scroll(top.value,top2.value)
}
},
baseMoveTop(){ // 預設-向上滑動迴圈
top.value = -options.speed + Number(top.value)// 移動計算
top2.value = -options.speed + Number(top2.value)// 移動計算
if(Number(top.value)<=-Number(props.singleHeight)*props.scrollList.length){
top.value = 0
top2.value = Number(props.singleHeight)*props.scrollList.length - Number(props.height) // 初始位置
}
if(!isIn) timer = window.requestAnimationFrame(methods.baseMoveTop)
},
baseMoveBottom(){ // 預設-向下滑動迴圈
top.value = options.speed + Number(top.value) // 移動計算
top2.value = options.speed + Number(top2.value) // 移動計算
if(Number(top.value)>=0){
top.value = -Number(props.singleHeight)*props.scrollList.length
top2.value = -Number(props.height) // 初始位置
}
if(!isIn) timer = window.requestAnimationFrame(methods.baseMoveBottom)
},
singleMoveTop(){ // 單步-向上滑動迴圈
// let dir = 1
dis.value = options.speed + dis.value
top.value = -options.speed + Number(top.value) // 移動計算
top2.value = -options.speed + Number(top2.value)// 移動計算
if(Number(top.value)<=-Number(props.singleHeight)*props.scrollList.length){
top.value = 0
top2.value = Number(props.singleHeight)*props.scrollList.length - Number(props.height) // 初始位置
}
if(dis.value >= Number(props.singleHeight)){
dis.value = 0
window.cancelAnimationFrame(timer)
let nowTime = 0
let lastTime = Date.now()
function pause() { // 停頓時間計算
nowTime = Date.now()
if(nowTime -lastTime >= Number(props.pauseTime)){
lastTime = nowTime
window.requestAnimationFrame(methods.singleMoveTop)
window.cancelAnimationFrame(timer)
return
}
timer = window.requestAnimationFrame(pause)
}
pause()
return
}
if(!isIn) timer = window.requestAnimationFrame(methods.singleMoveTop)
},
singleMoveBottom(){ // 單步-向下滑動迴圈
dis.value = Number(options.speed) + dis.value
top.value = options.speed + Number(top.value) // 移動計算
top2.value = options.speed + Number(top2.value) // 移動計算
if(Number(top.value)>=0){
top.value = -Number(props.singleHeight)*props.scrollList.length
top2.value = -Number(props.height) // 初始位置
}
if(dis.value >= Number(props.singleHeight)){ // 滾動一行後停止動畫，停頓時間之後繼續動畫
dis.value = 0
window.cancelAnimationFrame(timer)
let nowTime = 0
let lastTime = Date.now()
function pause() { // 停頓時間計算
nowTime = Date.now()
if(nowTime -lastTime >= Number(props.pauseTime)){
lastTime = nowTime
window.requestAnimationFrame(methods.singleMoveBottom)
window.cancelAnimationFrame(timer)
return
}
timer = window.requestAnimationFrame(pause)
}
pause()
return
}
if(!isIn) timer = window.requestAnimationFrame(methods.singleMoveBottom)
}
} return{
widthX,
heightY,
timer,
options,
dis,
isFull,
top,
top2,
...methods,
}
}
});
</script>
<style lang="postcss" scoped>
.indefiniteScroll{
margin: 0;
padding: 0;
user-select: none;
padding: 1px;
/* transition: all 0.5s; */
.scroll-item{
height: 30px;
line-height: 30px;
font-size: 14px;
color: rgb(0, 0, 0);
p{
margin: 0;
padding: 0;
}
}
.scroll-item:nth-of-type(1){
margin-top: 0;
}
}
.box{
overflow: hidden;
}
</style>