<template>
 <div id="app">
 <er-carousel-index :typeNumber=2 :pageNumber=3 :timeSpace=2 :duration=2 :isOrNotCircle="true" url="/src/js/index.json" :isOrNotButton=false>
 <template scope="props">-----使用子組件傳過來的值，封裝slot
 <div class="articleList-box-photo ">
 <div class="tu imageEffectsAnimate imageEffects_Magnifier">
 <a>
 <img class="minMax" :src="props.item.img">
 </a>
 </div>
 </div>
 <div class="articleList-box-title">
 <div class="title">
 <a class="textleft">{{props.item.title}}</a>
 </div>
 </div>
 </template>
 </er-carousel-index>
 </div>
</template>
<script>
 import ErCarouselIndex from './components/carouselIndex/src/carouselIndex.vue'
 export default {
 name: 'app',
 data() {
 }
 },
 components: {
 ErCarouselIndex//一定要進行組件聲明，不然不能引用子組件
 }
 }
</script>

<template>
 <div tag="div" class="articleList articleListMod-3 er-carouseindex" name="slide-fade" id="articleList" :style="{height:imgHeight+'px'}" >
 <span id="btn1" class="er-carouseindex-left" @mousedown="imgMove('mouseLeft')" @mouseup="cancelMove('left')" v-show="isOrNotButton"></span>
 <span id="btn2" class="er-carouseindex-right" @mousedown="imgMove('mouseRight')" @mouseup="cancelMove('right')" v-show="isOrNotButton"></span>
 <div id="packageAll" class="er-carouseindex-con" @mouseover="clearAuto" @mouseout="slideAuto">
 <div class="er-carouseindex-bar" v-show="isOrNotCircle">
 <div v-for="(item,dex) in imgList" @mouseup="clearAuto" class="er-carouseindex-circle" @click="circleClick(dex)" :class="{circleSelected:dex===indexCircle}">
 </div>
 </div>
 <div id="imageAll" class="er-carouseindex-item" :style="{transform:translateX,transition:transFlag?transitionTime:''}">
 <div class="articleList-box er-carouseindex-box" v-for="(list,index) in imgLisShow" :style="{width:imgWidth+'%'}"
 style="max-height:50%;">
 <slot :item="list"></slot>
 </div>
 </div>
 </div>
 </div>
</template>
<script>
 export default
 {
 name: "ErCarouselIndex",
 data(){
 return {
 imgList: [],//請求接口數據
 imgLisShow: [],//圖片滾動數據，包括左中右三種
 timer: null,//自動循環滾動時的間隔時間
 timeout:null,//長按時的圖片滾動間隔時間
 index:0,//圖片索引
 translateXnum:0,//圖片滾動時的偏移量
 translateX:"",//生成圖片偏移時的表達式
 imgWidth:"",//圖片所占寬度
 timeDown:"",//鼠標剛按下時的時間
 timeup:"",//鼠標松開時的時間
 clickSpace:"",//鼠標按下松開的時間間隙
 transFlag:true,//是否勻速滾動,
 transitionTime:"",
 indexCircle:0//小圓圈滾動索引
 }
 },
 props:{
 duration:0,//圖片延時滾動
 typeNumber:0, //每次滾動幾張
 timeSpace:0, //圖片滾動時間間隔
 url:String,//請求接口地址
 pageNumber:0,//當前頁面顯示幾張圖片
 isOrNotButton:true,//是否顯示左右按鈕
 isOrNotCircle:true,//是否顯示小圓圈
 imgHeight:""http://圖片滾動顯示高度
 },
 watch:{
 index:{
 handler(){
 var _this=this;
 if(Math.abs(this.index)==this.imgList.length){
 this.indexCircle=0;
 setTimeout(function(){
 _this.reset();
 },_this.duration*1000*0.98);
 }else{
 this.indexCircle=this.index;
 }
 this.calcXnum();
 }
 },
 translateXnum:{
 handler(){
 this.translateX="translateX("+this.translateXnum+"%)";
 }
 }
 },
 methods:{
 //頁面初始化復賦值
 imgView:function() {
 var _this = this;
 _this.$http.get(_this.url).then(function (res) {
 _this.imgList = res.data.imgList;
 for(var i=0;i<3;i++){
 _this.imgList.forEach(function (item, index) {
 _this.imgLisShow.push(item);
 });
 }
 _this.reset();
 _this.slideAuto();
 _this.imgWidth=(100/_this.pageNumber)-1;
 _this.transitionTime="all "+_this.duration*0.98+"s linear";
 console.log(_this.transitionTime);
 });
 },
 //圖片滾動方法(長按)
 imgMove:function(direct){
 var _this = this;
 _this.timeDown=new Date();//記錄按下的時間
 _this.timeout = setInterval(function() {
 if(direct=="mouseLeft") {
 _this.leftMove();
 }else{
 _this.rightMove();
 }
 },300);
 },
 //鼠標送開時執行的方法
 cancelMove:function(direct){
 var _this = this;
 _this.clearAuto();
 this.timeup=new Date();//記錄松開的時間
 this.clickSpace=this.timeup.getTime() - this.timeDown.getTime();
 //時間間隔小于500毫秒為點擊，反之為長按
 if(this.clickSpace<500){
 for(var i=0;i<_this.typeNumber;i++){
 if(direct=="left"){
 _this.leftMove();
 }else{
 _this.rightMove();
 }
 }
 }
 if (this.timeout) {
 clearInterval(this.timeout);
 this.timeout = null;
 }
 },
 //向左移動
 leftMove:function(){
 this.index--;
 this.transFlag=true;
 },
 //向右移動
 rightMove:function(){
 this.transFlag=true;
 this.index++;
 },
 slideAuto:function () {
 var _this = this;
 _this.timer = setTimeout(function () {
 if(Math.abs(_this.index)!==_this.imgList.length){
 _this.rightMove();
 _this.slideAuto();
 }
 }, _this.timeSpace * 1000);
 },
 clearAuto:function () {
 console.log("停止");
 if (this.timer) {
 clearInterval(this.timer);
 this.timer = null;
 }
 },
 //重置
 reset:function(){
 this.index=0;
 this.transFlag=false;
 this.calcXnum();
 },
 calcXnum:function(){
 var _this=this;
 this.translateXnum=-(this.index+this.imgList.length)*(100/this.pageNumber);
 },
 //點擊圓圈跳轉圖片
 circleClick:function(dex){
 this.index=dex;
 this.clearAuto();
 }
 },
 mounted()
 {
 this.$nextTick(function () {
 this.imgView();
 });
 }
 }
</script>