<template>
  <div class="test_wrapper" @dragover="dragover($event)">
    <transition-group class="transition-wrapper" name="sort">
      <div v-for="(item) in datalist" :key='item.id' class="sort-item"
        :draggable="true"
        @dragstart="dragstart(item)"
        @dragenter="dragenter(item,$event)"
        @dragend="dragend(item,$event)"
        @dragover="dragover($event)"
      >
        {{ item.label }}
      </div>
    </transition-group>
  </div>
</template>
 
<script lang="ts">
  import {vue, component, prop, watch} from "vue-property-decorator";
  import { addwebsite } from '@/api'
  @component({
    components: {}
  })
  export default class test extends vue {
 
    olddata: any = null; // 开始排序时按住的旧数据
    newdata: any = null; // 拖拽过程的数据
 
    // 列表数据
    datalist:any = [
      { id:1,label:'测试一号' },
      { id:2,label:'测试二号' },
      { id:3,label:'测试三号' },
      { id:4,label:'测试四号' },
    ];
 
    dragstart(value: any) {
      this.olddata = value
    }
 
    // 记录移动过程中信息
    dragenter(value: any, e: any) {
      this.newdata = value
      e.preventdefault()
    }
 
    // 拖拽最终操作
    dragend(value: any, e: any) {
      if (this.olddata !== this.newdata) {
        let oldindex = this.datalist.indexof(this.olddata)
        let newindex = this.datalist.indexof(this.newdata)
        let newitems = [...this.datalist]
        // 删除老的节点
        newitems.splice(oldindex, 1)
        // 在列表中目标位置增加新的节点
        newitems.splice(newindex, 0, this.olddata)
        this.datalist = [...newitems]
      }
    }
 
 
    // 拖动事件（主要是为了拖动时鼠标光标不变为禁止）
    dragover(e: any) {
      e.preventdefault()
    }
 
 
  };
</script>
<style>
.sort-move {
  transition: transform 0.3s;
}
</style>