<template>
 <div class="address">
  <div class="addressboxbg" @click="cancel"></div>
  <div class="addressbox">
   <p class="text_btn"><span style="float:left;" @click="cancel">取消</span><span style="float:right;color:#107E52;" @click="complete">完成</span></p>
   <div class="addressSelect" >
    <div class="selectbox"></div>
    <ul @touchstart="touchStart($event,'province')" @touchmove="touchMove($event,'province')" @touchend="touchEnd($event,'province')" :style="provinceStyle" :class="[{'selectAni':addSelect}]">
     <li v-for="(item,index) in list" :class="[{'addSelectActive':index == provinceIndex}]" :key="index">{{item.name}}</li>
    </ul>
    <ul @touchstart="touchStart($event,'city')" @touchmove="touchMove($event,'city')" @touchend="touchEnd($event,'city')" :style="cityStyle" :class="[{'selectAni':addSelect}]">
     <li v-for="(item,index) in list2" :class="[{'addSelectActive':index == cityIndex}]" :key="index">{{item.name}}</li>
    </ul>
    <ul @touchstart="touchStart($event,'district')" @touchmove="touchMove($event,'district')" @touchend="touchEnd($event,'district')" :style="districtStyle" :class="[{'selectAni':addSelect}]">
     <li v-for="(item,index) in list3" :class="[{'addSelectActive':index == districtIndex}]" :key="index" >{{item.name}}</li>
    </ul>
   </div>
  </div>
 </div>
</template>
 
<script>
export default {
 data () {
  return {
   list: [],
   list2: [],
   list3: [],
   provinceStyle: {
    WebkitTransform: 'translate3d(0px,0px,0px)'
   },
   cityStyle: {
    WebkitTransform: 'translate3d(0px,0px,0px)'
   },
   districtStyle: {
    WebkitTransform: 'translate3d(0px,0px,0px)'
   },
   startTop: 0,
   provinceIndex: 0,
   cityIndex: 0,
   districtIndex: 0,
   translateY: 0,
   maxScroll: 0,
   addHeight: 0,
   addSelect: false,
   provinceVal: '',
   cityVal: '',
   areaVal: '',
   val: {
    'provinceVal': '',
    'cityVal': '',
    'areaVal': ''
   }
  }
 },
 watch: {
  // 监听省滑动
  provinceVal (value) {
   this.$axiosGet(this.$api.area, {parentId: value}).then((res) => {
    if (res.code === 1) {
     this.list2 = res.data.length > 1 ? res.data : [{name: '-'}]
     if (res.data.length < 1) {
      this.list3 = [{name: '-'}]
     }
     this.cityVal = this.list2[0].value
    }
   })
  },
  // 监听市滑动
  cityVal (value) {
   if (value) {
    this.$axiosGet(this.$api.area, {parentId: value}).then((res) => {
     if (res.code === 1) {
      this.list3 = res.data.length > 1 ? res.data : [{name: '-'}]
     }
    })
   }
  }
 },
 created () {
  // 初始化数据
  // 拿省的数据
  this.$axiosGet(this.$api.area).then((res) => {
   if (res.code === 1) {
    this.list = res.data
    this.val.provinceVal = this.list[0]
   }
  })
  // 拿市区的数据
  this.$axiosGet(this.$api.area, {parentId: '1'}).then((res) => {
   if (res.code === 1) {
    this.list2 = res.data
    this.val.cityVal = this.list2[0]
   }
  })
  this.val.areaVal = {
   'name': '',
   'value': ''
  }
  // 第一条数据为直辖市 so '-' 符号表示为第三列
  this.list3 = [{name: '-'}]
 },
 methods: {
  // 点击取消
  cancel () {
   this.$emit('cancel', false)
  },
  // 点击完成
  complete () {
   if (!this.val.areaVal.value) {
    this.val.areaVal = {
     'name': '',
     'value': ''
    }
   }
   if (!this.val.cityVal.value) {
    this.val.cityVal = {
     'name': '',
     'value': ''
    }
   }
   this.$emit('complete', this.val)
  },
  // 滑动开始
  touchStart (e, val) {
   e.preventDefault()
   this.addSelect = false
   this.addHeight = e.currentTarget.children[0].offsetHeight
   this.maxScroll = this.addHeight * e.currentTarget.children.length
   this.startTop = e.targetTouches[0].pageY
   switch (val) {
    case 'province':
     this.translateY = parseInt(this.provinceStyle.WebkitTransform.slice(this.provinceStyle.WebkitTransform.indexOf(',') + 1, this.provinceStyle.WebkitTransform.lastIndexOf(',')))
     break
    case 'city':
     this.translateY = parseInt(this.cityStyle.WebkitTransform.slice(this.cityStyle.WebkitTransform.indexOf(',') + 1, this.cityStyle.WebkitTransform.lastIndexOf(',')))
     break
    case 'district':
     this.translateY = parseInt(this.districtStyle.WebkitTransform.slice(this.districtStyle.WebkitTransform.indexOf(',') + 1, this.districtStyle.WebkitTransform.lastIndexOf(',')))
     break
    default:
     break
   }
  },
  // 滑动进行中
  touchMove (e, val) {
   e.preventDefault()
   switch (val) {
    case 'province':
     if ((e.targetTouches[0].pageY - this.startTop + this.translateY) > 0) {
      this.provinceStyle.WebkitTransform = 'translate3d(0px,0px,0px)'
     } else if ((e.targetTouches[0].pageY - this.startTop + this.translateY) < -(this.maxScroll - this.addHeight)) {
      this.provinceStyle.WebkitTransform = 'translate3d(0px,' + -(this.maxScroll - this.addHeight) + 'px,0px)'
     } else {
      this.provinceStyle.WebkitTransform = 'translate3d(0px,' + (e.targetTouches[0].pageY - this.startTop + this.translateY) + 'px,0px)'
     }
     break
    case 'city':
     if ((e.targetTouches[0].pageY - this.startTop + this.translateY) > 0) {
      this.cityStyle.WebkitTransform = 'translate3d(0px,0px,0px)'
     } else if ((e.targetTouches[0].pageY - this.startTop + this.translateY) < -(this.maxScroll - this.addHeight)) {
      this.cityStyle.WebkitTransform = 'translate3d(0px,' + -(this.maxScroll - this.addHeight) + 'px,0px)'
     } else {
      this.cityStyle.WebkitTransform = 'translate3d(0px,' + (e.targetTouches[0].pageY - this.startTop + this.translateY) + 'px,0px)'
     }
     break
    case 'district':
     if ((e.targetTouches[0].pageY - this.startTop + this.translateY) > 0) {
      this.districtStyle.WebkitTransform = 'translate3d(0px,0px,0px)'
     } else if ((e.targetTouches[0].pageY - this.startTop + this.translateY) < -(this.maxScroll - this.addHeight)) {
      this.districtStyle.WebkitTransform = 'translate3d(0px,' + -(this.maxScroll - this.addHeight) + 'px,0px)'
     } else {
      this.districtStyle.WebkitTransform = 'translate3d(0px,' + (e.targetTouches[0].pageY - this.startTop + this.translateY) + 'px,0px)'
     }
     break
    default:
     break
   }
  },
  // 滑动结束
  touchEnd (e, val) {
   e.preventDefault()
   this.addSelect = true
   switch (val) {
    case 'province':
     let provinceTranslateY = parseInt(this.provinceStyle.WebkitTransform.slice(this.provinceStyle.WebkitTransform.indexOf(',') + 1, this.provinceStyle.WebkitTransform.lastIndexOf(',')))
     this.provinceIndex = -Math.round(provinceTranslateY / this.addHeight)
     this.provinceStyle.WebkitTransform = 'translate3d(0px,' + (Math.round(provinceTranslateY / this.addHeight) * this.addHeight) + 'px,0px)'
     this.cityStyle.WebkitTransform = this.districtStyle.WebkitTransform = 'translate3d(0px,0px,0px)'
     this.cityIndex = this.districtIndex = 0
     break
    case 'city':
     let cityTranslateY = parseInt(this.cityStyle.WebkitTransform.slice(this.cityStyle.WebkitTransform.indexOf(',') + 1, this.cityStyle.WebkitTransform.lastIndexOf(',')))
     this.cityIndex = -Math.round(cityTranslateY / this.addHeight)
     this.cityStyle.WebkitTransform = 'translate3d(0px,' + (Math.round(cityTranslateY / this.addHeight) * this.addHeight) + 'px,0px)'
     this.districtStyle.WebkitTransform = 'translate3d(0px,0px,0px)'
     this.districtIndex = 0
     break
    case 'district':
     let districtTranslateY = parseInt(this.districtStyle.WebkitTransform.slice(this.districtStyle.WebkitTransform.indexOf(',') + 1, this.districtStyle.WebkitTransform.lastIndexOf(',')))
     this.districtIndex = -Math.round(districtTranslateY / this.addHeight)
     this.districtStyle.WebkitTransform = 'translate3d(0px,' + (Math.round(districtTranslateY / this.addHeight) * this.addHeight) + 'px,0px)'
     break
    default:
     break
   }
   // 滑动结束后 处理数据
   this.dataProcessing()
  },
  // 数据处理
  dataProcessing () {
   // 滑动数据传输 数据处理
   this.val.provinceVal = this.list[this.provinceIndex]
   this.provinceVal = this.list[this.provinceIndex].value
   this.val.cityVal = this.list2[this.cityIndex]
   this.cityVal = this.list2[this.cityIndex].value
   this.val.areaVal = this.list3[this.districtIndex]
   this.areaVal = this.list3[this.districtIndex].value
   // this.val.cityVal = this.addressData[this.provinceIndex].city[this.cityIndex].name
   // this.val.areaVal = this.addressData[this.provinceIndex].city[this.cityIndex].area[this.districtIndex]
   // this.$emit('getAddress', this.val)
   // this.test([this.val.provinceVal, this.cityIndex, this.districtIndex])
  }
 }
}
</script>
 
<style>
.address{
 position:absolute;
 top: 0px;
 bottom: 0px;
 left: 0px;
 right: 0px;
}
.address .addressbox{
 height: 40%;
 position: absolute;
 z-index: 101;
 width: 100%;
 max-height: 100%;
 overflow: hidden;
 background: #fff;
 bottom: 0px;
}
.address .addressbox .text_btn{
 height: 30px;
 font-size: 14px;
 line-height: 30px;
 border-top: 1px solid #ccc;
 border-bottom: 1px solid #ccc;
 padding: 0 10px;
 background: #F9F9F9;
}
.addressSelect .selectbox{
 width: 100%;
 height: 26px;
 border-top: 1px solid #ccc;
 border-bottom: 1px solid #ccc;
 margin-top: 60px;
 background: #F9F9F9;
}
.address .addressboxbg{
 position: absolute;
 left: 0;
 top: 0;
 z-index: 100;
 width: 100%;
 height: 100%;
 background: rgba(0,0,0,.7);
}
.addressSelect{width: 100%; position: relative; background: #fff; height: 190px;overflow: hidden; -webkit-mask-box-image: linear-gradient(0deg,transparent,transparent 5%,#fff 20%,#fff 80%,transparent 95%,transparent); font-size: 14px;}
.addressSelect ul{width: 33.333333%; position: absolute; left: 0; top:60px; -webkit-transform-style: preserve-3d; -webkit-backface-visibility:hidden; text-align: center; padding-left: 0;}
.addressSelect ul li{white-space : nowrap;overflow: hidden; text-overflow:ellipsis; color:rgba(0,0,0,.54); padding: 3px 0;}
.addressSelect ul:nth-of-type(2){left: 33.333333%;}
.addressSelect ul:nth-of-type(3){left: 66.666666%;}
.addressSelect ul li.addSelectActive{color:rgba(0,0,0,.87); transform: scale(1.1); transition: 0.5s;}
.selectAni{transition: 0.8s;}
</style>