code/train/JavaScript/0018037_handsonHelper.js

/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * HandsonHelper class
 */
export default class HandsonHelper {
  constructor (columns, rows, comment) {
    this.columns = columns || []
    this.rows = rows || []
    this.comment = comment || ''
    this._numericValidator = this._numericValidator.bind(this)
  }

  getHandsonTableConfig (columns, columnNames, resultRows) {
    let self = this
    return {
      colHeaders: columnNames,
      data: resultRows,
      rowHeaders: false,
      stretchH: 'all',
      sortIndicator: true,
      columns: columns,
      columnSorting: true,
      contextMenu: false,
      manualColumnResize: true,
      manualRowResize: true,
      readOnly: true,
      readOnlyCellClassName: '',
      fillHandle: false,
      fragmentSelection: true,
      disableVisualSelection: true,
      cells: function (ro, co, pro) {
        let cellProperties = {}
        let colType = columns[co].type
        cellProperties.renderer = function (instance, td, row, col, prop, value, cellProperties) {
          self._cellRenderer(instance, td, row, col, prop, value, cellProperties, colType)
        }
        return cellProperties
      },
      afterGetColHeader: function (col, TH) {
        let instance = this
        let menu = self._buildDropDownMenu(columns[col].type)
        let button = self._buildTypeSwitchButton()

        self._addButtonMenuEvent(button, menu)

        Handsontable.Dom.addEvent(menu, 'click', function (event) {
          if (event.target.nodeName === 'LI') {
            self._setColumnType(columns, event.target.data.colType, instance, col)
          }
        })
        if (TH.firstChild.lastChild.nodeName === 'BUTTON') {
          TH.firstChild.removeChild(TH.firstChild.lastChild)
        }
        TH.firstChild.appendChild(button)
        TH.style['white-space'] = 'normal'
      }
    }
  }

  /*
  ** Private Service Functions
  */

  _addButtonMenuEvent (button, menu) {
    Handsontable.Dom.addEvent(button, 'click', function (event) {
      let changeTypeMenu
      let position
      let removeMenu

      document.body.appendChild(menu)

      event.preventDefault()
      event.stopImmediatePropagation()

      changeTypeMenu = document.querySelectorAll('.changeTypeMenu')

      for (let i = 0, len = changeTypeMenu.length; i < len; i++) {
        changeTypeMenu[i].style.display = 'none'
      }
      menu.style.display = 'block'
      position = button.getBoundingClientRect()

      menu.style.top = (position.top + (window.scrollY || window.pageYOffset)) + 2 + 'px'
      menu.style.left = (position.left) + 'px'

      removeMenu = function (event) {
        if (menu.parentNode) {
          menu.parentNode.removeChild(menu)
        }
      }
      Handsontable.Dom.removeEvent(document, 'click', removeMenu)
      Handsontable.Dom.addEvent(document, 'click', removeMenu)
    })
  }

  _buildDropDownMenu (activeCellType) {
    let menu = document.createElement('UL')
    let types = ['text', 'numeric', 'date']
    let item

    menu.className = 'changeTypeMenu'

    for (let i = 0, len = types.length; i < len; i++) {
      item = document.createElement('LI')
      if ('innerText' in item) {
        item.innerText = types[i]
      } else {
        item.textContent = types[i]
      }

      item.data = {'colType': types[i]}

      if (activeCellType === types[i]) {
        item.className = 'active'
      }
      menu.appendChild(item)
    }

    return menu
  }

  _buildTypeSwitchButton () {
    let button = document.createElement('BUTTON')

    button.innerHTML = '\u25BC'
    button.className = 'changeType'

    return button
  }

  _isNumeric (value) {
    if (!isNaN(value)) {
      if (value.length !== 0) {
        if (Number(value) <= Number.MAX_SAFE_INTEGER && Number(value) >= Number.MIN_SAFE_INTEGER) {
          return true
        }
      }
    }
    return false
  }

  _cellRenderer (instance, td, row, col, prop, value, cellProperties, colType) {
    if (colType === 'numeric' && this._isNumeric(value)) {
      cellProperties.format = '0,0.[00000]'
      td.style.textAlign = 'left'
      // eslint-disable-next-line prefer-rest-params
      Handsontable.renderers.NumericRenderer.apply(this, arguments)
    } else if (value.length > '%html'.length && value.substring(0, '%html '.length) === '%html ') {
      td.innerHTML = value.substring('%html'.length)
    } else {
      // eslint-disable-next-line prefer-rest-params
      Handsontable.renderers.TextRenderer.apply(this, arguments)
    }
  }

  _dateValidator (value, callback) {
    let d = moment(value)
    return callback(d.isValid())
  }

  _numericValidator (value, callback) {
    return callback(this._isNumeric(value))
  }

  _setColumnType (columns, type, instance, col) {
    columns[col].type = type
    this._setColumnValidator(columns, col)
    instance.updateSettings({columns: columns})
    instance.validateCells(null)
    if (this._isColumnSorted(instance, col)) {
      instance.sort(col, instance.sortOrder)
    }
  }

  _isColumnSorted (instance, col) {
    return instance.sortingEnabled && instance.sortColumn === col
  }

  _setColumnValidator (columns, col) {
    if (columns[col].type === 'numeric') {
      columns[col].validator = this._numericValidator
    } else if (columns[col].type === 'date') {
      columns[col].validator = this._dateValidator
    } else {
      columns[col].validator = null
    }
  }
}