小程序拖动区域实现排序效果

<view class="area-section">
    <block wx:for="{{areaData}}" wx:for-item="areaitem" wx:key='index'>
        <view class="areaItem {{moveIndex == index ? 'move' : ''}}" style="top: {{top}}px" >
            <view class="head">
        <view class="head-sort" catchtap="changeShowSateEvent"></view>
                <view class="head-name" 
                catchtouchstart="moveStartEvent"
        catchtouchmove="moveEvent" 
                catchtouchend="moveEndEvent"
        data-index="{{index}}"
                data-item = "{{areaItem}}"
        >{{areaItem.name}}</view>
            </view>
            <view class="container" style="display: {{areaItem.display}}">
                <block wx:for="{{areaItem.list}}" wx:key="index">
                    <view class="item">{{item}}</view>
                </block>
            </view>
      </view>
    </block>
</view>

.area-section{
  position: relative;
}
.areaItem{
  margin: 0 30rpx;
  margin-bottom: 40rpx;
  padding-left: 20rpx;
  box-sizing: border-box;
}
.areaItem .head{
  display: flex;
  align-items: center;
  height: 80rpx;
  line-height: 80rpx;
}
.areaItem .head-sort{
  width: 40rpx;
  height: 40rpx;
  border-radius: 20rpx;
  background-color: turquoise;
  margin-right: 20rpx;
}
.areaItem .head .name{
  flex: 1;
}
.areaItem .container{
  display: flex;
  flex-wrap: wrap;
}
.areaItem .container .item{
  width: 315rpx;
  height: 200rpx;
  background-color: rgb(88, 177, 177);
  color: white;
  border-radius: 20rpx;
  box-shadow: 0rpx 3rpx 8rpx rgb(83, 82, 82);
  margin: 20rpx 0;
  margin-right: 20rpx;
  display: flex;
  justify-content: center;
  align-items: center;
}
.areaItem .container .item:nth-of-type(2n){
  margin-right: 0rpx;
}
.move{
  box-shadow: 1px 1px 10rpx rgba(3, 129, 87, 0.685);
  background-color: rgba(255, 255, 255, 0.603);
  border-radius: 20rpx;
  position: absolute;
  width: 670rpx;

}

let y,y1,y2
Page({
  data: {
    areaData: [
      {
        name: "北华街1栋",
        list: ["北华101","北华102"]
      },
      {
        name: "东林街2栋",
        list: ["东林101","东林102","东林103"]
      },
      {
        name: "季南街3栋",
        list: ["季南101","季南102","季南103"]
      },
      {
        name: "丘亭街4栋",
        list: ["丘亭101","丘亭102"]
      }
    ],
    currentAreaShowState: true,
    moveIndex: -1
  },
  onLoad: function(){
    this.initData()
  },
  // 初始化处理数据
  initData: function(){
    let areaList = this.data.areaData
    areaList.forEach( (item)=>{
      item.display = 'flex'
    })
    this.setData({
      areaData: areaList
    })
    console.log(this.data.areaData)
  },
  // 点击绿色圆，子区域集体或者隐藏，或者展开
  changeShowSateEvent: function(){
    let currentAreaShowState = this.data.currentAreaShowState
    let areaList = this.data.areaData
    areaList.forEach( (item)=>{
      currentAreaShowState ? item.display = 'none' : item.display = 'flex'
    })
    this.setData({
      currentAreaShowState: !currentAreaShowState,
      areaData: areaList
    })
  },
  // 当所有子区域隐藏，区域才可以拖拽排序
  // 点击区域头部拖拽
  moveStartEvent: function(e){
    if(!this.data.currentAreaShowState){
      console.log(e)
      let moveIndex = e.currentTarget.dataset.index
      y = e.touches[0].clientY;
      y1 = e.currentTarget.offsetTop;//是事件绑定的当前组件相对于父容器的偏移量
      this.setData({
        moveIndex: moveIndex,
        top: y1//移动盒子所在的位置
      })
    }
  },
  moveEvent: function(e){
   if(!this.data.currentAreaShowState){
    let moveIndex = e.currentTarget.dataset.index
    console.log(e)
    y2 = e.touches[0].clientY - y + y1;
    this.setData({
      moveIndex: moveIndex,
      top: y2
    })
   }
  },
  moveEndEvent: function(e){
    if(!this.data.currentAreaShowState){
      let moveIndex = this.data.moveIndex
      let areaData = this.data.areaData
      let areaItem = e.currentTarget.dataset.item
      let positionIndex = 0
      console.log(y2)
      if(y2>(areaData.length-1)*55){
        positionIndex = areaData.length-1
      }else if(y2<=5){
        positionIndex = 0
      }else{
        if(y2%((80+30)/2)>15){//(行高+行间距)/2>15
          positionIndex = parseInt(y2/((80+30)/2))+1
        }else{
          positionIndex = parseInt(y2/((80+30)/2))
        }
      }
      console.log(positionIndex)
      if(positionIndex != moveIndex){
        if(positionIndex > moveIndex){
          areaData.splice(positionIndex+1,0,areaItem)
          areaData.splice(moveIndex,1)
        }else if(positionIndex < moveIndex){
          areaData.splice(positionIndex,0,areaItem)
          areaData.splice(moveIndex+1,1)
        }
      }
      this.setData({
        areaData: areaData,
        moveIndex: -1
      })
    }
  }
})