other / mew-iview

  <template>

      <div :class="wrapClasses" :style="styles">

          <div :class="classes">

              <div :class="[prefixCls + '-title']" v-if="showSlotHeader" ref="title"><slot name="header"></slot></div>
              <div :class="[prefixCls + '-header']" v-if="showHeader" ref="header" @mousewheel="handleMouseWheel">

                  <table-head

                      :prefix-cls="prefixCls"

                      :styleObject="tableHeaderStyle"

                      :columns="cloneColumns"

                      :column-rows="columnRows"

                      :obj-data="objData"

                      :columns-width="columnsWidth"

                      :data="rebuildData"></table-head>

              </div>

              <div :class="[prefixCls + '-body']" :style="bodyStyle" ref="body" @scroll="handleBodyScroll"

                  v-show="!((!!localeNoDataText && (!data || data.length === 0)) || (!!localeNoFilteredDataText && (!rebuildData || rebuildData.length === 0)))">

                  <table-body

                      ref="tbody"

                      :prefix-cls="prefixCls"

                      :styleObject="tableStyle"

                      :columns="cloneColumns"
                      :data="rebuildData"

                      :columns-width="columnsWidth"

                      :obj-data="objData"></table-body>

              </div>

              <div

                  :class="[prefixCls + '-tip']" :style="bodyStyle" @scroll="handleBodyScroll"

                  v-show="((!!localeNoDataText && (!data || data.length === 0)) || (!!localeNoFilteredDataText && (!rebuildData || rebuildData.length === 0)))">

                  <table cellspacing="0" cellpadding="0" border="0">
                      <tbody>
                          <tr>

                              <td :style="{'height':bodyStyle.height,'width':`${this.headerWidth}px`}">

                                  <span v-html="localeNoDataText" v-if="!data || data.length === 0"></span>
                                  <span v-html="localeNoFilteredDataText" v-else></span>

                              </td>
                          </tr>
                      </tbody>
                  </table>
              </div>

              <div :class="[prefixCls + '-fixed']" :style="fixedTableStyle" v-if="isLeftFixed">

                  <div :class="fixedHeaderClasses" v-if="showHeader">

                      <table-head

                          fixed="left"

                          :prefix-cls="prefixCls"

                          :styleObject="fixedTableStyle"

                          :columns="leftFixedColumns"

                          :column-rows="columnRows"

                          :fixed-column-rows="leftFixedColumnRows"

                          :obj-data="objData"

                          :columns-width="columnsWidth"

                          :data="rebuildData"></table-head>

                  </div>

                  <div :class="[prefixCls + '-fixed-body']" :style="fixedBodyStyle" ref="fixedBody" @mousewheel="handleFixedMousewheel" @DOMMouseScroll="handleFixedMousewheel">

                      <table-body

                          fixed="left"

                          :prefix-cls="prefixCls"

                          :styleObject="fixedTableStyle"

                          :columns="leftFixedColumns"
                          :data="rebuildData"

                          :columns-width="columnsWidth"

                          :obj-data="objData"></table-body>

                  </div>

              </div>

              <div :class="[prefixCls + '-fixed-right']" :style="fixedRightTableStyle" v-if="isRightFixed">

                  <div :class="fixedHeaderClasses" v-if="showHeader">

                      <table-head

                          fixed="right"

                          :prefix-cls="prefixCls"

                          :styleObject="fixedRightTableStyle"

                          :columns="rightFixedColumns"

                          :column-rows="columnRows"

                          :fixed-column-rows="rightFixedColumnRows"

                          :obj-data="objData"

                          :columns-width="columnsWidth"

                          :data="rebuildData"></table-head>

                  </div>

                  <div :class="[prefixCls + '-fixed-body']" :style="fixedBodyStyle" ref="fixedRightBody" @mousewheel="handleFixedMousewheel" @DOMMouseScroll="handleFixedMousewheel">

                      <table-body

                          fixed="right"

                          :prefix-cls="prefixCls"

                          :styleObject="fixedRightTableStyle"

                          :columns="rightFixedColumns"
                          :data="rebuildData"

                          :columns-width="columnsWidth"

                          :obj-data="objData"></table-body>

                  </div>

              </div>

              <div :class="[prefixCls + '-fixed-right-header']" :style="fixedRightHeaderStyle" v-if="isRightFixed"></div>

              <div :class="[prefixCls + '-footer']" v-if="showSlotFooter" ref="footer"><slot name="footer"></slot></div>

          </div>

          <Spin fix size="large" v-if="loading">
              <slot name="loading"></slot>
          </Spin>

      </div>
  </template>
  <script>

      import tableHead from './table-head.vue';
      import tableBody from './table-body.vue';

      import Spin from '../spin/spin.vue';

      import { oneOf, getStyle, deepCopy, getScrollBarSize } from '../../utils/assist';

      import { on, off } from '../../utils/dom';

      import Csv from '../../utils/csv';
      import ExportCsv from './export-csv';

      import Locale from '../../mixins/locale';

      import elementResizeDetectorMaker from 'element-resize-detector';

      import { getAllColumns, convertToRows, convertColumnOrder, getRandomStr } from './util';

      const prefixCls = 'ivu-table';
  

      let rowKey = 1;
      let columnKey = 1;
  

      export default {

          name: 'Table',

          mixins: [ Locale ],

          components: { tableHead, tableBody, Spin },

          props: {
              data: {
                  type: Array,
                  default () {

                      return [];

                  }
              },
              columns: {
                  type: Array,
                  default () {

                      return [];

                  }
              },
              size: {
                  validator (value) {

                      return oneOf(value, ['small', 'large', 'default']);

                  }
              },

              width: {
                  type: [Number, String]
              },

              height: {
                  type: [Number, String]
              },

              stripe: {
                  type: Boolean,
                  default: false
              },
              border: {
                  type: Boolean,
                  default: false
              },

              showHeader: {
                  type: Boolean,
                  default: true
              },

              highlightRow: {

                  type: Boolean,
                  default: false

              },
              rowClassName: {
                  type: Function,
                  default () {
                      return '';
                  }

              },

              context: {

                  type: Object

              },
              noDataText: {

                  type: String

              },
              noFilteredDataText: {

                  type: String

              },

              disabledHover: {

                  type: Boolean

              },
              loading: {
                  type: Boolean,
                  default: false

              }
          },
          data () {

              const colsWithId = this.makeColumnsId(this.columns);

              return {

                  ready: false,

                  tableWidth: 0,

                  columnsWidth: {},

                  prefixCls: prefixCls,

                  compiledUids: [],

                  objData: this.makeObjData(),     // checkbox or highlight-row

                  rebuildData: [],    // for sort or filter

                  cloneColumns: this.makeColumns(colsWithId),

                  columnRows: this.makeColumnRows(false, colsWithId),
                  leftFixedColumnRows: this.makeColumnRows('left', colsWithId),
                  rightFixedColumnRows: this.makeColumnRows('right', colsWithId),
                  allColumns: getAllColumns(colsWithId),  // for multiple table-head, get columns that have no children

                  showSlotHeader: true,
                  showSlotFooter: true,

                  bodyHeight: 0,

                  scrollBarWidth: getScrollBarSize(),

                  currentContext: this.context,

                  cloneData: deepCopy(this.data),    // when Cell has a button to delete row data, clickCurrentRow will throw an error, so clone a data

                  showVerticalScrollBar:false,

                  showHorizontalScrollBar:false,

                  headerWidth:0,
                  headerHeight:0,

              };

          },
          computed: {

              localeNoDataText () {
                  if (this.noDataText === undefined) {
                      return this.t('i.table.noDataText');
                  } else {
                      return this.noDataText;
                  }
              },
              localeNoFilteredDataText () {
                  if (this.noFilteredDataText === undefined) {
                      return this.t('i.table.noFilteredDataText');
                  } else {
                      return this.noFilteredDataText;
                  }
              },

              wrapClasses () {
                  return [
                      `${prefixCls}-wrapper`,
                      {

                          [`${prefixCls}-hide`]: !this.ready,
                          [`${prefixCls}-with-header`]: this.showSlotHeader,
                          [`${prefixCls}-with-footer`]: this.showSlotFooter

                      }

                  ];

              },

              classes () {
                  return [
                      `${prefixCls}`,
                      {

                          [`${prefixCls}-${this.size}`]: !!this.size,
                          [`${prefixCls}-border`]: this.border,

                          [`${prefixCls}-stripe`]: this.stripe,

                          [`${prefixCls}-with-fixed-top`]: !!this.height

                      }

                  ];

              },

              fixedHeaderClasses () {
                  return [
                      `${prefixCls}-fixed-header`,
                      {
                          [`${prefixCls}-fixed-header-with-empty`]: !this.rebuildData.length
                      }
                  ];
              },

              styles () {
                  let style = {};

                  if (this.height) {

                      const height = parseInt(this.height);

                      style.height = `${height}px`;
                  }

                  if (this.width) style.width = `${this.width}px`;

                  return style;
              },

              tableStyle () {
                  let style = {};

                  if (this.tableWidth !== 0) {

                      let width = '';
                      if (this.bodyHeight === 0) {
                          width = this.tableWidth;
                      } else {

                          width = this.tableWidth - (this.showVerticalScrollBar?this.scrollBarWidth:0);

                      }
  //                    const width = this.bodyHeight === 0 ? this.tableWidth : this.tableWidth - this.scrollBarWidth;

                      style.width = `${width}px`;
                  }

                  return style;

              },

              tableHeaderStyle () {
                  let style = {};
                  if (this.tableWidth !== 0) {
                      let width = '';
                      width = this.tableWidth;
                      style.width = `${width}px`;
                  }
                  return style;
              },

              fixedTableStyle () {
                  let style = {};

                  let width = 0;
                  this.leftFixedColumns.forEach((col) => {

                      if (col.fixed && col.fixed === 'left') width += col._width;

                  });
                  style.width = `${width}px`;

                  return style;
              },
              fixedRightTableStyle () {
                  let style = {};

                  let width = 0;
                  this.rightFixedColumns.forEach((col) => {

                      if (col.fixed && col.fixed === 'right') width += col._width;

                  });

                  //width += this.scrollBarWidth;

                  style.width = `${width}px`;

                  style.right = `${this.showVerticalScrollBar?this.scrollBarWidth:0}px`;

                  return style;
              },

              fixedRightHeaderStyle () {
                  let style = {};
                  let width = 0;
                  let height = this.headerHeight+1;
                  if(this.showVerticalScrollBar){
                      width = this.scrollBarWidth;
                  }
                  style.width = `${width}px`;
                  style.height = `${height}px`;
                  return style;
              },

              bodyStyle () {
                  let style = {};

                  if (this.bodyHeight !== 0) {

                      const height = this.bodyHeight;

                      style.height = `${height}px`;
                  }

                  return style;

              },
              fixedBodyStyle () {
                  let style = {};

                  if (this.bodyHeight !== 0) {

                      let height = this.bodyHeight - (this.showHorizontalScrollBar?this.scrollBarWidth:0);
                      style.height = this.showHorizontalScrollBar ? `${height}px` : `${height - 1}px`;

                  }

                  return style;

              },
              leftFixedColumns () {

                  return convertColumnOrder(this.cloneColumns, 'left');

              },
              rightFixedColumns () {

                  return convertColumnOrder(this.cloneColumns, 'right');

              },
              isLeftFixed () {
                  return this.columns.some(col => col.fixed && col.fixed === 'left');
              },
              isRightFixed () {
                  return this.columns.some(col => col.fixed && col.fixed === 'right');

              }
          },
          methods: {

              rowClsName (index) {
                  return this.rowClassName(this.data[index], index);
              },

              handleResize () {

                      //let tableWidth = parseInt(getStyle(this.$el, 'width')) - 1;

                  let tableWidth = this.$el.offsetWidth - 1;
                  let columnsWidth = {};

                  let sumMinWidth = 0;

                  let hasWidthColumns = [];
                  let noWidthColumns = [];

                  let maxWidthColumns = [];
                  let noMaxWidthColumns = [];

                  this.cloneColumns.forEach((col) => {
                      if (col.width) {
                          hasWidthColumns.push(col);
                      }
                      else{
                          noWidthColumns.push(col);

                          if (col.minWidth) {
                              sumMinWidth += col.minWidth;
                          }
                          if (col.maxWidth) {
                              maxWidthColumns.push(col);
                          }
                          else {
                              noMaxWidthColumns.push(col);
                          }

                      }
                      col._width = null;
                  });
  
  
                  let unUsableWidth = hasWidthColumns.map(cell => cell.width).reduce((a, b) => a + b, 0);

                  let usableWidth = tableWidth - unUsableWidth - sumMinWidth - (this.showVerticalScrollBar?this.scrollBarWidth:0) - 1;

                  let usableLength = noWidthColumns.length;
                  let columnWidth = 0;
                  if(usableWidth > 0 && usableLength > 0){
                      columnWidth = parseInt(usableWidth / usableLength);
                  }

                  for (let i = 0; i < this.cloneColumns.length; i++) {
                      const column = this.cloneColumns[i];

                      let width = columnWidth + (column.minWidth?column.minWidth:0);

                      if(column.width){
                          width = column.width;
                      }
                      else{
                          if (column._width) {
                              width = column._width;

                          }

                          else {

                              if (column.minWidth > width){
                                  width = column.minWidth;
                              }
                              else if (column.maxWidth < width){
                                  width = column.maxWidth;
                              }

                              if (usableWidth>0) {

                                  usableWidth -= width - (column.minWidth?column.minWidth:0);
                                  usableLength--;
                                  if (usableLength > 0) {

                                      columnWidth = parseInt(usableWidth / usableLength);

                                  }

                                  else {

                                      columnWidth = 0;

                                  }

                              }

                              else{
                                  columnWidth = 0;
                              }

                          }

                      }

                      column._width = width;

                      columnsWidth[column._index] = {
                          width: width
                      };

                  }

                  if(usableWidth>0) {
                      usableLength = noMaxWidthColumns.length;
                      columnWidth = parseInt(usableWidth / usableLength);
                      for (let i = 0; i < noMaxWidthColumns.length; i++) {
                          const column = noMaxWidthColumns[i];
                          let width = column._width + columnWidth;
                          if (usableLength > 1) {
                              usableLength--;
                              usableWidth -= columnWidth;
                              columnWidth = parseInt(usableWidth / usableLength);
                          }
                          else {
                              columnWidth = 0;
                          }
  
                          column._width = width;
  
                          columnsWidth[column._index] = {
                              width: width
                          };
  
                      }
                  }

                  this.tableWidth = this.cloneColumns.map(cell => cell._width).reduce((a, b) => a + b, 0) + (this.showVerticalScrollBar?this.scrollBarWidth:0) + 1;

                  this.columnsWidth = columnsWidth;
                  this.fixedHeader();

              },

              handleMouseIn (_index) {

                  if (this.disabledHover) return;

                  if (this.objData[_index]._isHover) return;
                  this.objData[_index]._isHover = true;

              },

              handleMouseOut (_index) {

                  if (this.disabledHover) return;

                  this.objData[_index]._isHover = false;

              },

              // 通用处理 highlightCurrentRow 和 clearCurrentRow
              handleCurrentRow (type, _index) {

                  let oldIndex = -1;

                  for (let i in this.objData) {
                      if (this.objData[i]._isHighlight) {
                          oldIndex = parseInt(i);
                          this.objData[i]._isHighlight = false;

                      }

                  }

                  if (type === 'highlight') this.objData[_index]._isHighlight = true;

                  const oldData = oldIndex < 0 ? null : JSON.parse(JSON.stringify(this.cloneData[oldIndex]));

                  const newData = type === 'highlight' ? JSON.parse(JSON.stringify(this.cloneData[_index])) : null;
                  this.$emit('on-current-change', newData, oldData);
              },
              highlightCurrentRow (_index) {
                  if (!this.highlightRow || this.objData[_index]._isHighlight) return;
                  this.handleCurrentRow('highlight', _index);
              },
              clearCurrentRow () {
                  if (!this.highlightRow) return;
                  this.handleCurrentRow('clear');

              },

              clickCurrentRow (_index) {
                  this.highlightCurrentRow (_index);

                  this.$emit('on-row-click', JSON.parse(JSON.stringify(this.cloneData[_index])), _index);

              },
              dblclickCurrentRow (_index) {
                  this.highlightCurrentRow (_index);

                  this.$emit('on-row-dblclick', JSON.parse(JSON.stringify(this.cloneData[_index])), _index);

              },

              getSelection () {
                  let selectionIndexes = [];

                  for (let i in this.objData) {
                      if (this.objData[i]._isChecked) selectionIndexes.push(parseInt(i));
                  }

                  return JSON.parse(JSON.stringify(this.data.filter((data, index) => selectionIndexes.indexOf(index) > -1)));
              },

              toggleSelect (_index) {

                  let data = {};

  
                  for (let i in this.objData) {
                      if (parseInt(i) === _index) {
                          data = this.objData[i];

                          break;

                      }
                  }
                  const status = !data._isChecked;

  
                  this.objData[_index]._isChecked = status;

  
                  const selection = this.getSelection();

                  this.$emit(status ? 'on-select' : 'on-select-cancel', selection, JSON.parse(JSON.stringify(this.data[_index])));

                  this.$emit('on-selection-change', selection);
              },

              toggleExpand (_index) {
                  let data = {};
  
                  for (let i in this.objData) {
                      if (parseInt(i) === _index) {
                          data = this.objData[i];

                          break;

                      }
                  }
                  const status = !data._isExpanded;
                  this.objData[_index]._isExpanded = status;
                  this.$emit('on-expand', JSON.parse(JSON.stringify(this.cloneData[_index])), status);
              },

              selectAll (status) {

                  // this.rebuildData.forEach((data) => {
                  //     if(this.objData[data._index]._isDisabled){
                  //         this.objData[data._index]._isChecked = false;
                  //     }else{
                  //         this.objData[data._index]._isChecked = status;
                  //     }

                  // });
                  for(const data of this.rebuildData){

                      if(this.objData[data._index]._isDisabled){

                          continue;

                      }else{
                          this.objData[data._index]._isChecked = status;
                      }

                  }

                  const selection = this.getSelection();

                  if (status) {

                      this.$emit('on-select-all', selection);

                  }

                  this.$emit('on-selection-change', selection);

              },

              fixedHeader () {

                  if (this.height) {

                      this.$nextTick(() => {

                          const titleHeight = parseInt(getStyle(this.$refs.title, 'height')) || 0;
                          const headerHeight = parseInt(getStyle(this.$refs.header, 'height')) || 0;
                          const footerHeight = parseInt(getStyle(this.$refs.footer, 'height')) || 0;

                          this.bodyHeight = this.height - titleHeight - headerHeight - footerHeight;

                          this.$nextTick(()=>this.fixedBody());

                      });

                  } else {
                      this.bodyHeight = 0;

                      this.$nextTick(()=>this.fixedBody());

                  }

              },

              fixedBody (){

                  if (this.$refs.header) {
                      this.headerWidth = this.$refs.header.children[0].offsetWidth;
                      this.headerHeight = this.$refs.header.children[0].offsetHeight;

                      //this.showHorizontalScrollBar = this.headerWidth>this.$refs.header.offsetWidth;

                  }
  

                  if (!this.$refs.tbody || !this.data || this.data.length === 0) {

                      this.showVerticalScrollBar = false;

                  }
                  else{
                      let bodyContentEl = this.$refs.tbody.$el;
                      let bodyEl = bodyContentEl.parentElement;
                      let bodyContentHeight = bodyContentEl.offsetHeight;
                      let bodyHeight = bodyEl.offsetHeight;

                      this.showHorizontalScrollBar = bodyEl.offsetWidth < bodyContentEl.offsetWidth + (this.showVerticalScrollBar?this.scrollBarWidth:0);

                      this.showVerticalScrollBar = this.bodyHeight? bodyHeight - (this.showHorizontalScrollBar?this.scrollBarWidth:0) < bodyContentHeight : false;
                      
                      if(this.showVerticalScrollBar){
                          bodyEl.classList.add(this.prefixCls +'-overflowY');
                      }else{
                          bodyEl.classList.remove(this.prefixCls +'-overflowY');
                      }
                      if(this.showHorizontalScrollBar){
                          bodyEl.classList.add(this.prefixCls +'-overflowX');
                      }else{
                          bodyEl.classList.remove(this.prefixCls +'-overflowX');
                      }

                  } 

              },
  

              hideColumnFilter () {
                  this.cloneColumns.forEach((col) => col._filterVisible = false);
              },

              handleBodyScroll (event) {

                  if (this.showHeader) this.$refs.header.scrollLeft = event.target.scrollLeft;
                  if (this.isLeftFixed) this.$refs.fixedBody.scrollTop = event.target.scrollTop;
                  if (this.isRightFixed) this.$refs.fixedRightBody.scrollTop = event.target.scrollTop;

                  this.hideColumnFilter();

              },

              handleFixedMousewheel(event) {

                  let deltaY = event.deltaY;
                  if(!deltaY && event.detail){
                      deltaY = event.detail * 40;
                  }
                  if(!deltaY && event.wheelDeltaY){
                      deltaY = -event.wheelDeltaY;
                  }

                  if(!deltaY && event.wheelDelta){
                      deltaY = -event.wheelDelta;
                  }

                  if(!deltaY) return;

                  const body = this.$refs.body;
                  const currentScrollTop = body.scrollTop;
                  if (deltaY < 0 && currentScrollTop !== 0) {
                      event.preventDefault();
                  }
                  if (deltaY > 0 && body.scrollHeight - body.clientHeight > currentScrollTop) {
                      event.preventDefault();
                  }
                  //body.scrollTop += deltaY;
                  let step = 0;
                  let timeId = setInterval(()=>{

                      step += 5;

                      if(deltaY>0){

                          body.scrollTop += 2;

                      }
                      else{

                          body.scrollTop -= 2;

                      }

                      if(step >= Math.abs(deltaY)){

                          clearInterval(timeId);
                      }

                  }, 5);

              },

              handleMouseWheel (event) {
                  const deltaX = event.deltaX;

                  const $body = this.$refs.body;

  
                  if (deltaX > 0) {
                      $body.scrollLeft = $body.scrollLeft + 10;
                  } else {
                      $body.scrollLeft = $body.scrollLeft - 10;
                  }

              },

              sortData (data, type, index) {
                  const key = this.cloneColumns[index].key;
                  data.sort((a, b) => {
                      if (this.cloneColumns[index].sortMethod) {

                          return this.cloneColumns[index].sortMethod(a[key], b[key], type);

                      } else {

                          if (type === 'asc') {
                              return a[key] > b[key] ? 1 : -1;
                          } else if (type === 'desc') {
                              return a[key] < b[key] ? 1 : -1;
                          }

                      }
                  });
                  return data;
              },

              handleSort (_index, type) {
                  const index = this.GetOriginalIndex(_index);

                  this.cloneColumns.forEach((col) => col._sortType = 'normal');
  
                  const key = this.cloneColumns[index].key;

                  if (this.cloneColumns[index].sortable !== 'custom') {    // custom is for remote sort

                      if (type === 'normal') {

                          this.rebuildData = this.makeDataWithFilter();

                      } else {
                          this.rebuildData = this.sortData(this.rebuildData, type, index);

                      }

                  }

                  this.cloneColumns[index]._sortType = type;
  
                  this.$emit('on-sort-change', {

                      column: JSON.parse(JSON.stringify(this.allColumns[this.cloneColumns[index]._index])),

                      key: key,
                      order: type

                  });

              },

              handleFilterHide (index) {    // clear checked that not filter now
                  if (!this.cloneColumns[index]._isFiltered) this.cloneColumns[index]._filterChecked = [];
              },

              filterData (data, column) {
                  return data.filter((row) => {

                      //如果定义了远程过滤方法则忽略此方法

                      if (typeof column.filterRemote === 'function') return true;

                      let status = !column._filterChecked.length;

                      for (let i = 0; i < column._filterChecked.length; i++) {
                          status = column.filterMethod(column._filterChecked[i], row);
                          if (status) break;
                      }
                      return status;
                  });

              },
              filterOtherData (data, index) {

                  let column = this.cloneColumns[index];

                  if (typeof column.filterRemote === 'function') {
                      column.filterRemote.call(this.$parent, column._filterChecked, column.key, column);

                  }
  

                  this.cloneColumns.forEach((col, colIndex) => {
                      if (colIndex !== index) {
                          data = this.filterData(data, col);
                      }
                  });
                  return data;
              },
              handleFilter (index) {
                  const column = this.cloneColumns[index];

                  let filterData = this.makeDataWithSort();

  
                  // filter others first, after filter this column
                  filterData = this.filterOtherData(filterData, index);
                  this.rebuildData = this.filterData(filterData, column);
  

                  this.cloneColumns[index]._isFiltered = true;
                  this.cloneColumns[index]._filterVisible = false;

                  this.$emit('on-filter-change', column);

              },

              /**
               * #2832
               * 应该区分当前表头的 column 是左固定还是右固定
               * 否则执行到 $parent 时，方法的 index 与 cloneColumns 的 index 是不对应的
               * 左固定和右固定，要区分对待
               * 所以，此方法用来获取正确的 index
               * */
              GetOriginalIndex (_index) {
                  return this.cloneColumns.findIndex(item => item._index === _index);
              },
              handleFilterSelect (_index, value) {
                  const index = this.GetOriginalIndex(_index);

                  this.cloneColumns[index]._filterChecked = [value];
                  this.handleFilter(index);
              },

              handleFilterReset (_index) {
                  const index = this.GetOriginalIndex(_index);

                  this.cloneColumns[index]._isFiltered = false;

                  this.cloneColumns[index]._filterVisible = false;
                  this.cloneColumns[index]._filterChecked = [];

                  let filterData = this.makeDataWithSort();

                  filterData = this.filterOtherData(filterData, index);
                  this.rebuildData = filterData;

                  this.$emit('on-filter-change', this.cloneColumns[index]);

              },

              makeData () {
                  let data = deepCopy(this.data);

                  data.forEach((row, index) => {
                      row._index = index;
                      row._rowKey = rowKey++;
                  });

                  return data;

              },

              makeDataWithSort () {
                  let data = this.makeData();
                  let sortType = 'normal';
                  let sortIndex = -1;

                  let isCustom = false;
  

                  for (let i = 0; i < this.cloneColumns.length; i++) {
                      if (this.cloneColumns[i]._sortType !== 'normal') {
                          sortType = this.cloneColumns[i]._sortType;
                          sortIndex = i;

                          isCustom = this.cloneColumns[i].sortable === 'custom';

                          break;
                      }
                  }

                  if (sortType !== 'normal' && !isCustom) data =  this.sortData(data, sortType, sortIndex);

                  return data;
              },

              makeDataWithFilter () {
                  let data = this.makeData();
                  this.cloneColumns.forEach(col => data = this.filterData(data, col));
                  return data;
              },
              makeDataWithSortAndFilter () {
                  let data = this.makeDataWithSort();
                  this.cloneColumns.forEach(col => data = this.filterData(data, col));
                  return data;
              },

              makeObjData () {
                  let data = {};
                  this.data.forEach((row, index) => {
                      const newRow = deepCopy(row);// todo 直接替换
                      newRow._isHover = false;

                      if (newRow._disabled) {

                          newRow._isDisabled = newRow._disabled;

                      } else {

                          newRow._isDisabled = false;
                      }

                      if (newRow._checked) {

                          newRow._isChecked = newRow._checked;

                      } else {

                          newRow._isChecked = false;
                      }

                      if (newRow._expanded) {
                          newRow._isExpanded = newRow._expanded;
                      } else {
                          newRow._isExpanded = false;
                      }

                      if (newRow._highlight) {
                          newRow._isHighlight = newRow._highlight;
                      } else {
                          newRow._isHighlight = false;
                      }

                      data[index] = newRow;
                  });
                  return data;

              },

              // 修改列，设置一个隐藏的 id，便于后面的多级表头寻找对应的列，否则找不到
              makeColumnsId (columns) {
                  return columns.map(item => {
                      if ('children' in item) item.children = this.makeColumnsId(item.children);
                      item.__id = getRandomStr(6);
                      return item;
                  });
              },
              makeColumns (cols) {

                  // 在 data 时，this.allColumns 暂时为 undefined

                  let columns = deepCopy(getAllColumns(cols));

                  let left = [];
                  let right = [];
                  let center = [];
  
                  columns.forEach((column, index) => {

                      column._index = index;

                      column._columnKey = columnKey++;

                      column.width = parseInt(column.width);

                      column._width = column.width ? column.width : '';    // update in handleResize()

                      column._sortType = 'normal';
                      column._filterVisible = false;
                      column._isFiltered = false;
                      column._filterChecked = [];

                      if ('filterMultiple' in column) {
                          column._filterMultiple = column.filterMultiple;
                      } else {
                          column._filterMultiple = true;
                      }

                      if ('filteredValue' in column) {
                          column._filterChecked = column.filteredValue;
                          column._isFiltered = true;
                      }

                      if ('sortType' in column) {
                          column._sortType = column.sortType;
                      }
  

                      if (column.fixed && column.fixed === 'left') {
                          left.push(column);
                      } else if (column.fixed && column.fixed === 'right') {
                          right.push(column);
                      } else {
                          center.push(column);
                      }
                  });
                  return left.concat(center).concat(right);

              },

              // create a multiple table-head

              makeColumnRows (fixedType, cols) {
                  return convertToRows(cols, fixedType);

              },

              exportCsv (params) {
                  if (params.filename) {
                      if (params.filename.indexOf('.csv') === -1) {
                          params.filename += '.csv';
                      }
                  } else {
                      params.filename = 'table.csv';
                  }
  
                  let columns = [];
                  let datas = [];
                  if (params.columns && params.data) {
                      columns = params.columns;
                      datas = params.data;
                  } else {

                      columns = this.allColumns;

                      if (!('original' in params)) params.original = true;
                      datas = params.original ? this.data : this.rebuildData;
                  }
  
                  let noHeader = false;
                  if ('noHeader' in params) noHeader = params.noHeader;
  

                  const data = Csv(columns, datas, params, noHeader);
                  if (params.callback) params.callback(data);
                  else ExportCsv.download(params.filename, data);

              }
          },

          created () {

              if (!this.context) this.currentContext = this.$parent;

              this.showSlotHeader = this.$slots.header !== undefined;
              this.showSlotFooter = this.$slots.footer !== undefined;

              this.rebuildData = this.makeDataWithSortAndFilter();

          },

          mounted () {

              this.handleResize();

              this.$nextTick(() => this.ready = true);

              on(window, 'resize', this.handleResize);

              this.observer = elementResizeDetectorMaker();
              this.observer.listenTo(this.$el, this.handleResize);
  

              this.$on('on-visible-change', (val) => {

                  if (val) {
                      this.handleResize();

                  }

              });

          },
          beforeDestroy () {

              off(window, 'resize', this.handleResize);

              this.observer.removeListener(this.$el, this.handleResize);

          },
          watch: {
              data: {
                  handler () {

                      const oldDataLen = this.rebuildData.length;

                      this.objData = this.makeObjData();

                      this.rebuildData = this.makeDataWithSortAndFilter();

                      this.handleResize();

                      if (!oldDataLen) {
                          this.fixedHeader();
                      }

                      // here will trigger before clickCurrentRow, so use async
                      setTimeout(() => {
                          this.cloneData = deepCopy(this.data);
                      }, 0);

                  },
                  deep: true
              },
              columns: {
                  handler () {

                      // todo 这里有性能问题，可能是左右固定计算属性影响的

                      const colsWithId = this.makeColumnsId(this.columns);
                      this.allColumns = getAllColumns(colsWithId);

                      this.cloneColumns = this.makeColumns(colsWithId);

                      this.columnRows = this.makeColumnRows(false, colsWithId);
                      this.leftFixedColumnRows = this.makeColumnRows('left', colsWithId);
                      this.rightFixedColumnRows = this.makeColumnRows('right', colsWithId);

                      this.rebuildData = this.makeDataWithSortAndFilter();

                      this.handleResize();

                  },
                  deep: true

              },
              height () {

                  this.handleResize();

              },
              showHorizontalScrollBar () {
                  this.handleResize();

              },
              showVerticalScrollBar () {
                  this.handleResize();

              }
          }

      };
  </script>