/**
* @Author: jianglei
* @Date:  2017-10-12 12:06:49
*/
'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>
 <el-table :data="formatData" :row-style="showRow" v-bind="$attrs">
  <el-table-column v-if="columns.length===0" width="150">
   <template slot-scope="scope">
    <span v-for="space in scope.row._level" :key="space" class="ms-tree-space"/>
    <span v-if="iconShow(0,scope.row)" class="tree-ctrl" @click="toggleExpanded(scope.$index)">
     <i v-if="!scope.row._expanded" class="el-icon-plus"/>
     <i v-else class="el-icon-minus"/>
    </span>
    {{ scope.$index }}
   </template>
  </el-table-column>
  <el-table-column v-for="(column, index) in columns" v-else :key="column.value" :label="column.text" :width="column.width">
   <template slot-scope="scope">
    <!-- Todo -->
    <!-- eslint-disable-next-line vue/no-confusing-v-for-v-if -->
    <span v-for="space in scope.row._level" v-if="index === 0" :key="space" class="ms-tree-space"/>
    <span v-if="iconShow(index,scope.row)" class="tree-ctrl" @click="toggleExpanded(scope.$index)">
     <i v-if="!scope.row._expanded" class="el-icon-plus"/>
     <i v-else class="el-icon-minus"/>
    </span>
    {{ scope.row[column.value] }}
   </template>
  </el-table-column>
  <slot/>
 </el-table>
</template>
 
<script>
/**
 Auth: Lei.j1ang
 Created: 2018/1/19-13:59
*/
import treeToArray from "./eval";
export default {
 name: "TreeTable",
 props: {
  /* eslint-disable */
  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 scoped>
.ms-tree-space {
 position: relative;
 top: 1px;
 display: inline-block;
 font-style: normal;
 font-weight: 400;
 line-height: 1;
 width: 18px;
 height: 14px;
}
.ms-tree-space::before {
 content: "";
}
.processContainer {
 width: 100%;
 height: 100%;
}
table td {
 line-height: 26px;
}
.tree-ctrl {
 position: relative;
 cursor: pointer;
 color: #2196f3;
 margin-left: -18px;
}
</style>

<tree-table :data="data" :columns="columns" border/>

import treeTable from "./TreeTable";

components: { treeTable },
data() {
  return {
   columns: [
    {
     text: "事件",
     value: "event",
     width: 200
    },
    {
     text: "ID",
     value: "id"
    },
    {
     text: "時間線",
     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"
          }
         ]
        }
       ]
      }
     ]
    }
   ]
  };
 },