<template>
  <div class="delete">
    <div class="slider">
      <div class="content" @touchstart='touchStart' @touchmove='touchMove' @touchend='touchEnd' :style="deleteSlider">
        <!-- 插槽中放具體項目中需要內(nèi)容 -->
        <slot name="img"></slot>
        <slot name="title"></slot>
        <slot name="price"></slot>
        <!-- 默認插槽 -->
        <slot></slot>
      </div>
      <div class="remove" ref='remove' @click="deleteLine">
        刪除
      </div>
    </div>
  </div>
</template>

<script>
export default {
  props: ['index'],
  data() {
    return {
      startX: 0,  //觸摸位置
      endX: 0,   //結(jié)束位置
      moveX: 0,  //滑動時的位置
      disX: 0,  //移動距離
      deleteSlider: '',//滑動時的效果,使用v-bind:style="deleteSlider"
    }
  },
  methods:{
    touchStart(ev){
      ev = ev || event
      //tounches類數(shù)組，等于1時表示此時有只有一只手指在觸摸屏幕
      if(ev.touches.length == 1){
        // 記錄開始位置
        this.startX = ev.touches[0].clientX;
      }
    },
    touchMove(ev){
      ev = ev || event;
      //獲取刪除按鈕的寬度，此寬度為滑塊左滑的最大距離
      let wd = this.$refs.remove.offsetWidth;
      if(ev.touches.length == 1) {
        // 滑動時距離瀏覽器左側(cè)實時距離
        this.moveX = ev.touches[0].clientX
        //起始位置減去 實時的滑動的距離，得到手指實時偏移距離
        this.disX = this.startX - this.moveX;
        //console.log(this.disX)
        // 如果是向右滑動或者不滑動，不改變滑塊的位置
        if (this.disX < 0 || this.disX == 0) {
          this.deleteSlider = "transform:translateX(0px)";
        } else if (this.disX > 0) {// 大于0，表示左滑了，此時滑塊開始滑動 
          //具體滑動距離我取的是 手指偏移距離*5。
          this.deleteSlider = "transform:translateX(-" + this.disX*5 + "px)";
          // 最大也只能等于刪除按鈕寬度 
          if (this.disX*5 >= wd) {
            this.deleteSlider = "transform:translateX(-" +wd+ "px)";
          }
        }
      }
    },
    touchEnd(ev){
      ev = ev || event;
      let wd = this.$refs.remove.offsetWidth;
      if (ev.changedTouches.length == 1) {
        let endX = ev.changedTouches[0].clientX;
        this.disX = this.startX - endX;
        //console.log(this.disX)
        //如果距離小于刪除按鈕一半,強行回到起點
        if ((this.disX*5) < (wd/2)) {
          this.deleteSlider = "transform:translateX(0px)";
        }else{
          //大于一半 滑動到最大值
          this.deleteSlider = "transform:translateX(-"+wd+ "px)";
        }
      }
    },
    deleteLine (){
      this.deleteSlider = "transform:translateX(0px)";
      this.$emit('deleteLine');
    }  
  }
}
</script>

<template>
 <div class="mylist">  
  <delete-slider v-for="(list, index) in dataList" :key="index" @deleteLine="deleteLine(index, list.id)">
   <div class="li-img" slot="img"><img :src="list.img" alt=""></div>
   <h3 class="li-title" slot="title">{{list.title}}</h3>
   <p class="li-price" slot="price">{{list.price}}</p>
  </delete-slider> 
 </div>
</template>

<script>


import deleteSlider from '@/components/deleteTemplate.vue'

export default {
 components: {
  deleteSlider
 },
 data () {
  return {
   dataList: [
    {
     id: 1,
     img: 'static/a1.jpg',
     title: '法國專柜2019夏季新款修身顯瘦氣質(zhì)包臀短裙鏤空蕾絲性感連衣裙子',
     price: '399.00'
    },
    {
     id: 2,
     img: 'static/a2.jpg',
     title: 'VERAMOON 亮片印花短袖連衣裙女夏甜美露背性感泡泡袖修身短裙',
     price: '689.00'
    },
    {
     id: 3,
     img: 'static/a3.jpg',
     title: 'famous 仙氣木耳邊紫色小碎花短裙a字雪紡連衣裙女',
     price: '199.00'
    },
    {
     id: 4,
     img: 'static/a4.jpg',
     title: '灰灰定制 2019春夏新款小香風(fēng)粗花呢連衣裙女法式名媛復(fù)古短裙M家',
     price: '298.00'
    }
   ]
  }
 },
 methods:{
   deleteLine (index, id){
    console.log(id);
    
    this.dataList.splice(index, 1)
   }   
  }
}
</script>