//利用element-ui的 <template slot-scope="scope">屬性，在插入多級表格
<template>
 <el-table :data="formatData" :row-style="showRow" v-bind="$attrs">
  <el-table-column v-if="columns.length===0" width="150">
   <template slot-scope="scope">
    <span v-for="space in scope.row._level" class="ms-tree-space" :key="space"></span>
    <span class="tree-ctrl" v-if="iconShow(0,scope.row)" @click="toggleExpanded(scope.$index)">
     <i v-if="!scope.row._expanded" class="el-icon-plus"></i>
     <i v-else class="el-icon-minus"></i>
    </span>
    {{scope.$index}}
   </template>
  </el-table-column>
  <el-table-column v-else v-for="(column, index) in columns" :key="column.value" :label="column.text" :width="column.width">
   <template slot-scope="scope">
    <span v-if="index === 0" v-for="space in scope.row._level" class="ms-tree-space" :key="space"></span>
    <span class="tree-ctrl" v-if="iconShow(index,scope.row)" @click="toggleExpanded(scope.$index)">
     <i v-if="!scope.row._expanded" class="el-icon-plus"></i>
     <i v-else class="el-icon-minus"></i>
    </span>
    {{scope.row[column.value]}}
   </template>
  </el-table-column>
  <slot></slot>
 </el-table>
</template>

<script>
import treeToArray from './eval'
export default {
 name: 'treeTable',
 props: {
  data: {
   type: [Array, Object],
   required: true
  },
  columns: {
   type: Array,
   default: () => []
  },
  evalFunc: Function,
  evalArgs: Array,
  expandAll: {
   type: Boolean,
   default: false
  }
 },
 computed: {
  // 格式化數(shù)據(jù)源
  formatData: function() {
   let tmp
   if (!Array.isArray(this.data)) {
    tmp = [this.data]
   } else {
    tmp = this.data
   }
   const func = this.evalFunc || treeToArray
   const args = this.evalArgs ? Array.concat([tmp, this.expandAll], this.evalArgs) : [tmp, this.expandAll]
   return func.apply(null, args)
  }
 },
 methods: {
  showRow: function(row) {
   const show = (row.row.parent ? (row.row.parent._expanded && row.row.parent._show) : true)
   row.row._show = show
   return show ? 'animation:treeTableShow 1s;-webkit-animation:treeTableShow 1s;' : 'display:none;'
  },
  // 切換下級是否展開
  toggleExpanded: function(trIndex) {
   const record = this.formatData[trIndex]
   record._expanded = !record._expanded
  },
  // 圖標(biāo)顯示
  iconShow(index, record) {
   return (index === 0 && record.children && record.children.length > 0)
  }
 }
}
</script>
<style rel="stylesheet/css">
 @keyframes treeTableShow {
  from {opacity: 0;}
  to {opacity: 1;}
 }
 @-webkit-keyframes treeTableShow {
  from {opacity: 0;}
  to {opacity: 1;}
 }
</style>

<style lang="scss" rel="stylesheet/scss" scoped>
 $color-blue: #2196F3;
 $space-width: 18px;
 .ms-tree-space {
  position: relative;
  top: 1px;
  display: inline-block;
  font-style: normal;
  font-weight: 400;
  line-height: 1;
  width: $space-width;
  height: 14px;
  &::before {
   content: ""
  }
 }
 .processContainer{
  width: 100%;
  height: 100%;
 }
 table td {
  line-height: 26px;
 }

 .tree-ctrl{
  position: relative;
  cursor: pointer;
  color: $color-blue;
  margin-left: -$space-width;
 }
</style>

/**
 * @Author: hyf
 * @Date:  2018-10-27
 */
'use strict'
import Vue from 'vue'
export default function treeToArray(data, expandAll, parent = null, level = null) {
  let tmp = []
  Array.from(data).forEach(function(record) {
    if (record._expanded === undefined) {
      Vue.set(record, '_expanded', expandAll)
    }
    let _level = 1
    if (level !== undefined && level !== null) {
      _level = level + 1
    }
    Vue.set(record, '_level', _level)
      // 如果有父元素
    if (parent) {
      Vue.set(record, 'parent', parent)
    }
    tmp.push(record)
    if (record.children && record.children.length > 0) {
      const children = treeToArray(record.children, expandAll, record, _level)
      tmp = tmp.concat(children)
    }
  })
  return tmp
}

<template>
 <div class="app-container">
  <tree-table :data="data" :columns="columns" border></tree-table>
 </div>
</template>

<script>
import treeTable from '@/components/TreeTable'
export default {
 name: 'treeTableDemo',
 components: { treeTable },
 data() {
  return {
   columns: [
    {
     text: '事件',
     value: 'event',
     width: 200
    },
    {
     text: 'ID',
     value: 'id'
    },
    {
     text: '時(shí)間線',
     value: 'timeLine'
    },
    {
     text: '備注',
     value: 'comment'
    }
   ],
   data: [
    {
     id: 0,
     event: '事件1',
     timeLine: 50,
     comment: '無'
    },
    {
     id: 1,
     event: '事件1',
     timeLine: 100,
     comment: '無',
     children: [
      {
       id: 2,
       event: '事件2',
       timeLine: 10,
       comment: '無'
      },
      {
       id: 3,
       event: '事件3',
       timeLine: 90,
       comment: '無',
       children: [
        {
         id: 4,
         event: '事件4',
         timeLine: 5,
         comment: '無'
        },
        {
         id: 5,
         event: '事件5',
         timeLine: 10,
         comment: '無'
        },
        {
         id: 6,
         event: '事件6',
         timeLine: 75,
         comment: '無',
         children: [
          {
           id: 7,
           event: '事件7',
           timeLine: 50,
           comment: '無',
           children: [
            {
             id: 71,
             event: '事件71',
             timeLine: 25,
             comment: 'xx'
            },
            {
             id: 72,
             event: '事件72',
             timeLine: 5,
             comment: 'xx'
            },
            {
             id: 73,
             event: '事件73',
             timeLine: 20,
             comment: 'xx'
            }
           ]
          },
          {
           id: 8,
           event: '事件8',
           timeLine: 25,
           comment: '無'
          }
         ]
        }
       ]
      }
     ]
    }
   ]
  }
 }
}
</script>

 [{
  key1: value1,
  key2: value2,
  children: [{
   key1: value1
  },
  {
   key1: value1
  }]
 },
 {
  key1: value1
 }]

  {
   key1: value1,
   key2: value2,
   children: [{
    key1: value1
   },
   {
    key1: value1
   }]
  }

[{
 value:string,
 text:string,
 width:number
},{
 value:string,
 text:string,
 width:number
}]