<template>
 <div class="row">
  <div class="col-5">
   <h3>组件配置页面展示</h3>
   <draggable
    tag="el-collapse"
    class="dragArea list-group"
    :list="list2"
    group="comp"
    @change="log"
   >
    <el-collapse
     class="list-group-item left"
     v-for="(element,index) in list2"
     :key="index"
     v-model="activeNames"
     @change="handleChange"
    >
     <el-collapse-item :name="element.id">
      <template slot="title">
       <span>{{element.name}}</span>
       <i class="el-icon-circle-close" @click.stop="deleteItem(index)"></i>
      </template>
      <div>{{ element.content }}</div>
     </el-collapse-item>
    </el-collapse>
   </draggable>
  </div>
  <div class="col-5">
   <h3>可用组件列表</h3>
   <draggable
    class="dragArea list-group"
    :list="list1"
    :group="{ name: 'comp', pull: 'clone', put: false }"
    @change="log"
   >
    <div class="list-group-item" v-for="element in list1" :key="element.id">{{ element.name }}</div>
   </draggable>
  </div>
 </div>
</template>
<script>
import draggable from "vuedraggable";
export default {
 name: "clone",
 display: "Clone",
 order: 2,
 components: {
  draggable
 },
 data() {
  return {
   list1: [
    { name: "组件1", id: 1, content: "内容内容内容。。。。" },
    { name: "组件2", id: 2, content: "内容内容内容。。。。" },
    { name: "组件3", id: 3, content: "内容内容内容。。。。" },
    { name: "组件4", id: 4, content: "内容内容内容。。。。" },
    { name: "组件5", id: 5, content: "内容内容内容。。。。" },
    { name: "组件6", id: 6, content: "内容内容内容。。。。" },
    { name: "组件7", id: 7, content: "内容内容内容。。。。" }
   ],
   list2: [],
   activeNames: [],
   count: 0
  };
 },
 methods: {
  log: function(evt) {
   console.log(evt);
   if (evt.added) {
    this.count += 1;
    const item = evt.added.element;
    const idx = this.list2.findIndex(e => e.id === item.id);
    let temp = JSON.parse(JSON.stringify(this.list2));
    temp[idx].id = this.count;
    this.list2 = temp;
   }
  },
  handleChange: function() {},
  deleteItem: function(index) {
   this.list2.splice(index, 1);
  }
 }
};
</script>