<template>
<!--刷新按钮 和 筛选列的多选框 layout中要有 control 才显示，默认显示-->
 <div class="table">
 <div class="table-control" v-if="layoutKey.control">
  <div class="table-control-title" @click="reload">
  <i class="el-icon-refresh"></i></div>
  <el-dropdown class="table-control-title">
  <span class="el-dropdown-link"><i class="el-icon-s-operation table-control-icon"></i></span>
  <el-dropdown-menu slot="dropdown" class="table-control-checkbox">
   <el-checkbox-group v-model="headItems" @change="changeChecked">
   <el-checkbox class="table-control-checkbox-item"
       v-for="(item,index) in allColumn"
       :label="item"
       :key="index">{{item}}
   </el-checkbox>
   </el-checkbox-group>
  </el-dropdown-menu>
  </el-dropdown>
 </div>
 <!--列表主体-->
 <el-table class="table" style="width: 100%"
    ref="tableList"
    :data="tableData"
    :defaultSort.async="defaultSort"
    v-bind="$attrs"
    v-on="$listeners"
    @selectionChange="selectionChange"
    @sort-change="sortChange">
  <ex-table-column v-if="layoutKey.expand" type="expand" fixed>
  <slot name="expand" :data="props" slot-scope="props"/>
  </ex-table-column>
  <ex-table-column v-if="layoutKey.checkBox" fixed type="selection" :width="62"
      :selectable="selectable"/>
  <ex-table-column v-if="layoutKey.index" type="index" label="序号" width="60"/>
  <ex-table-column v-for="(column,index) in activeColumn" :key="index"
      :prop="column.field"
      :column-key="column.field" :label="column.title" :fixed="column.fixed"
      :sortable="column.sort" :selectable="column.selectable"
      :show-overflow-tooltip="column.tooltip"
      :autoFit='true' :width="column.width"
      :fitByClass="autoWidth(column.width)"
      :minWidth="column.minWidth || defaultWidth">
  <slot :name="column.field" :data="scope.row" :field="column.field" :content="column.field"
    :index="index" slot-scope="scope">
   <div>{{$utils.nvl(scope.row[column.field],'--')}}</div>
  </slot>
  </ex-table-column>
 </el-table>
 <!--分页控件，layout中要有 control 才显示，默认显示-->
 <el-pagination background small class="table-pagination"
     :current-page.sync="page.pageNo"
     :page-sizes="page.list"
     :page-size="page.pageSize"
     :layout="page.layout" :total="page.total"
     @current-change="handleCurrentChange"
     @size-change="handleSizeChange" v-if="layoutKey.page"/>
 </div>
</template>

<script>
 import debounce from 'lodash/debounce';
 import ExTableColumn from './ExTableColumn';

 export default {
 components: { ExTableColumn },
 // 提供出来给其他组件调用，具体用法参考 vue 官方用法
 provide() {
  return {
  tableList: this,
  };
 },

 props: {
 // 默认的表格大小
  defaultWidth: {
  type: Number,
  required: false,
  default: 100,
  },
 // 显示的控件，目前就page,control 两个可选，可根据需求自行扩展
  layout: {
  default: 'page,control',
  },
 // 多选时 返回的key，默认id
  checkKey: {
  type: [Number, String],
  default: () => 'id',
  },
 // 请求参数，必填
  req: {
  type: Object,
  required: true,
  default: () => ({
   url: undefined,
   type: 'post',
   params: {
   query: {},
   },
   pageNo: 1,
   pageSize: 1,
  }),
  },
 // 默认排序，参考 elementUI table 用法
  defaultSort: {
  type: [String, Object],
  required: false,
  },
  // 列表显示的列
  // {
   title ： 必填 String，  显示的列名
   field ： 必填 String ，  列中的key
   width ： 选填，String  列宽，单位像素,
   fixed ： 选填，String  是否固定的列，可选 right, left
   sort ： 选填，Boolean  是否可排序
   expend： 选填，Boolean  是否可展开,配置slot:expand 显示展开内容
   limit :  选填，Boolean  权限控制，false 则不显示
  }
  columns: {
  type: Array,
  required: true,
  default: () => [{ title: '操作', field: 'ctrl', width: '60', fixed: 'right' }],
  },

 // 这一行的 CheckBox 是否可以勾选，用法参考elementUI table用法
  selectable: {
  type: Function,
  default: () => true,
  },
  
  // 其他table参数，都会传给table
 },
 data() {
  return {
  layoutKey: {},

  page: {
   list: [5, 10, 20, 50, 100],
   total: null,
   pageSize: 10,
   pageNo: 1,
   layout: 'total,sizes,prev,pager,next,jumper',
  },

  tableData: [],
  sort: '',
  checkRows: [],
  checkKeys: [],

  headItems: [],
  allColumn: [],
  activeColumn: [],
  };
 },

 methods: {
  sortChange({ prop, order }) {
  this.sort = `${prop} ${order === 'descending' "less" scoped>
 @import './style/index';
</style>

<template>
 <div>
 <table-list
  :req="tableReq"
  ref="tableList"
  :stripe="true" // table 原来的参数也是支持使用的，方法也支持使用。
  :columns="[
     {title:'用户名',field:'name',sort:'true',fixed:true},
     {title:'英文名',field:'aliasName',sort:'true',fixed:true},
     {title:'年龄',field:'age', sort:true},
     {title:'职业',field:'job', sort:true},
     {title:'邮箱',field:'email'},
     {title:'出生日期',field:'birthday'},
     {title:'家庭住址',field:'address'},
     {title:'户籍',field:'domicile'},
     ]">
  <!--格式化时间列，所有的列都可以这么使用，slot 名为列field-->
  <template slot="birthday" slot-scope="{data}">
  <span>{{format(data.birthday)}}</span>
  </template>
 </table-list>
 </div>
</template>

<script>
 import TableList from './table/components/TableList';

 export default {
 name: 'HelloWorld',
 components: { TableList },
 data() {
  return {
  tableReq: {
   url: '/user/list', //必填
   type: 'post', //可选, 默认 post
   params: {} // 可选
  }
  };
 },

 methods: {
  format(time) {
  if (this.$utils.isEmpty(time)) return '/';
  return this.$utils.format(new Date(time), 'yyyy-MM-dd HH:mm');
  },
 },

 mounted() {
 }
 };
</script>