<!--
 * @pageName: 'tree-grid  树型表格'
 * @Date: 2017-07-17 16:48:44
 * @Last Modified by:   黄龙
 * @Last Modified time: 2017-07-17 16:48:44
 * @events  @on-row-click 单击行或者单击操作按钮方法 返回当前行数据,$event,index
            @on-selection-change  多选模式下 选中项变化时触发  返回选中数组
            @on-sort-change  排序时有效，当点击排序时触发 返回key和排序规则
   @props   items 显示的结构化数据
            columns 表格列的配置描述 sortable:true 开启排序功能
            type: 'selection'为多选功能 type: 'action' 为操作功能 actions:[{}] 操作按钮
 -->
<template>
  <div :style="{width:tableWidth}" class='autoTbale'>
    <table class="table table-bordered" id='hl-tree-table'>
      <thead>
      <tr>
        <th v-for="(column,index) in cloneColumns">
          <label v-if="column.type === 'selection'">
            <input type="checkbox" v-model="checks" @click="handleCheckAll">
          </label>
          <label v-else>
            {{ renderHeader(column, index) }}
                            <span class="ivu-table-sort" v-if="column.sortable">
                                <Icon type="arrow-up-b" :class="{on: column._sortType === 'asc'}" @click.native="handleSort(index, 'asc')" />
                                <Icon type="arrow-down-b" :class="{on: column._sortType === 'desc'}" @click.native="handleSort(index, 'desc')" />
                            </span>
          </label>
        </th>
      </tr>
      </thead>
      <tbody>
      <tr v-for="(item,index) in initItems" :key="item.id" v-show="show(item)" :class="{'child-tr':item.parent}">
        <td v-for="(column,snum) in columns" :key="column.key" >
          <label v-if="column.type === 'selection'">
            <input type="checkbox" :value="item.id" v-model="checkGroup">
          </label>
          <div v-if="column.type === 'action'">
            <i-button :type="action.type" size="small" @click="RowClick(item,$event,index,action.text)" v-for='action in (column.actions)' :key="action.text">{{action.text}}</i-button>
          </div>
          <label @click="toggle(index,item)" v-if="!column.type">
                            <span v-if='snum==iconRow()'>
                                <i v-html='item.spaceHtml'></i>
                                <i v-if="item.children&&item.children.length>0" class="ivu-icon" :class="{'ivu-icon-plus-circled':!item.expanded,'ivu-icon-minus-circled':item.expanded }"></i>
                                <i v-else class="ms-tree-space"></i>
                            </span> {{renderBody(item,column) }}
          </label>
        </td>
      </tr>
      </tbody>
    </table>
  </div>
</template>
<script>
  import Vue from 'vue'
  export default {
    name: 'treeGrid',
    props: {
      columns: Array,
      items: {
        type: Array,
        default: []
      }
    },
    data () {
      return {
        initItems: [], // 处理后数据数组
        cloneColumns: [], // 处理后的表头数据
        checkGroup: [], // 复选框数组
        checks: false, // 全选
        screenWidth: 0, // 自适应宽
        tdsWidth: 0, // td总宽
        timer: false, // 控制监听时长
        dataLength: 0 // 树形数据长度
      }
    },
    computed: {
      tableWidth () {
        return this.tdsWidth > this.screenWidth && this.screenWidth > 0 ? this.screenWidth + 'px' : '100%'
      }
    },
    watch: {
      screenWidth (val) {
        if (!this.timer) {
          this.screenWidth = val
          this.timer = true
          setTimeout(() => {
            this.timer = false
          }, 400)
        }
      },
      items () {
        if (this.items) {
          this.dataLength = this.Length(this.items)
          this.initData(this.deepCopy(this.items), 1, null)
          this.checkGroup = this.renderCheck(this.items)
          if (this.checkGroup.length === this.dataLength) {
            this.checks = true
          } else {
            this.checks = false
          }
        }
      },
      columns: {
        handler () {
          this.cloneColumns = this.makeColumns()
        },
        deep: true
      }
    },
    mounted () {
      if (this.items) {
        this.dataLength = this.Length(this.items)
        this.initData(this.deepCopy(this.items), 1, null)
        this.cloneColumns = this.makeColumns()
        this.checkGroup = this.renderCheck(this.items)
        if (this.checkGroup.length === this.dataLength) {
          this.checks = true
        } else {
          this.checks = false
        }
      }
      // / 绑定onresize事件 监听屏幕变化设置宽
      this.$nextTick(() => {
        this.screenWidth = document.body.clientWidth
      })
      window.onresize = () => {
        return (() => {
          window.screenWidth = document.body.clientWidth
          this.screenWidth = window.screenWidth
        })()
      }
    },
    methods: {
      //  有无多选框折叠位置优化
      iconRow () {
        for (var i = 0, len = this.columns.length; i < len; i++) {
          if (this.columns[i].type === 'selection') {
            return 1
          }
        }
        return 0
      },
      //  设置td宽度
      tdWidth (val) {
        if (val) {
          return {
            'min-width': val + 'px'
          }
        }
      },
      //  排序事件
      handleSort (index, type) {
//        this.cloneColumns.forEach((col) => col._sortType = 'normal')
        if (this.cloneColumns[index]._sortType === type) {
          this.cloneColumns[index]._sortType = 'normal'
        } else {
          this.cloneColumns[index]._sortType = type
        }
        this.$emit('on-sort-change', this.cloneColumns[index]['key'], this.cloneColumns[index]['_sortType'])
      },
      //  点击某一行事件
      RowClick (data, event, index, text) {
        let result = this.makeData(data)
        this.$emit('on-row-click', result, event, index, text)
      },
      //  点击事件 返回数据处理
      makeData (data) {
        const t = this.type(data)
        let o = []
        if (t === 'array') {
          o = []
        } else if (t === 'object') {
          o = {}
        } else {
          return data
        }
        if (t === 'array') {
          for (let i = 0; i < data.length; i++) {
            o.push(this.makeData(data[i]))
          }
        } else if (t === 'object') {
          for (let i in data) {
            if (i !== 'spaceHtml' && i !== 'parent' && i !== 'level' && i !== 'expanded' && i !== 'isShow' && i !==
              'load') {
              o[i] = this.makeData(data[i])
            }
          }
        }
        return o
      },
      //  处理表头数据
      makeColumns () {
        let columns = this.deepCopy(this.columns)
        columns.forEach((column, index) => {
          column._index = index
          column._width = column.width ? column.width : ''
          column._sortType = 'normal'
        })
        return columns
      },
      //  数据处理 增加自定义属性监听
      initData (items, level, parent) {
        this.initItems = []
        let spaceHtml = ''
        for (var i = 1; i < level; i++) {
          spaceHtml += '<i class="ms-tree-space"></i>'
        }
        items.forEach((item, index) => {
          item = Object.assign({}, item, {
            'parent': parent,
            'level': level,
            'spaceHtml': spaceHtml
          })
          if ((typeof item.expanded) === 'undefined') {
            item = Object.assign({}, item, {
              'expanded': false
            })
          }
          if ((typeof item.show) === 'undefined') {
            item = Object.assign({}, item, {
              'isShow': false
            })
          }
          item = Object.assign({}, item, {
            'load': (item.expanded ? 'true' : 'false')
          })
          this.initItems.push(item)
          if (item.children && item.expanded) {
            this.initData(item.children, level + 1, item)
          }
        })
      },
      //  隐藏显示
      show (item) {
        return ((item.level === 1) || (item.parent && item.parent.expanded && item.isShow))
      },
      toggle (index, item) {
        let level = item.level + 1
        let spaceHtml = ''
        for (var i = 1; i < level; i++) {
          spaceHtml += '<i class="ms-tree-space"></i>'
        }
        if (item.children) {
          if (item.expanded) {
            item.expanded = !item.expanded
            this.close(index, item)
          } else {
            item.expanded = !item.expanded
            if (item.load) {
              this.open(index, item)
            } else {
              item.load = true
              item.children.forEach((child, childIndex) => {
                this.initItems.splice((index + childIndex + 1), 0, child)
                // 设置监听属性
                Vue.set(this.initItems[index + childIndex + 1], 'parent', item)
                Vue.set(this.initItems[index + childIndex + 1], 'level', level)
                Vue.set(this.initItems[index + childIndex + 1], 'spaceHtml', spaceHtml)
                Vue.set(this.initItems[index + childIndex + 1], 'isShow', true)
                Vue.set(this.initItems[index + childIndex + 1], 'expanded', false)
              })
            }
          }
        }
      },
      open (index, item) {
        if (item.children) {
          item.children.forEach((child, childIndex) => {
            child.isShow = true
            if (child.children && child.expanded) {
              this.open(index + childIndex + 1, child)
            }
          })
        }
      },
      close (index, item) {
        if (item.children) {
          item.children.forEach((child, childIndex) => {
            child.isShow = false
            child.expanded = false
            if (child.children) {
              this.close(index + childIndex + 1, child)
            }
          })
        }
      },
      // checkbox 全选 选择事件
      handleCheckAll () {
        this.checks = !this.checks
        if (this.checks) {
          this.checkGroup = this.getArray(this.checkGroup.concat(this.All(this.items)))
        } else {
          this.checkGroup = []
        }
        this.$emit('on-selection-change', this.checkGroup)
      },
      //  数组去重
      getArray (a) {
        let hash = {}
        let len = a.length
        let result = []
        for (var i = 0; i < len; i++) {
          if (!hash[a[i]]) {
            hash[a[i]] = true
            result.push(a[i])
          }
        }
        return result
      },
      checkAllGroupChange (data) {
        if (this.dataLength > 0 && data.length === this.items.length) {
          this.checks = true
        } else {
          this.checks = false
        }
        this.$emit('on-selection-change', this.checkGroup)
      },
      All (data) {
        let arr = []
        data.forEach((item) => {
          arr.push(item.id)
          if (item.children && item.children.length > 0) {
            arr = arr.concat(this.All(item.children))
          }
        })
        return arr
      },
      //  返回树形数据长度
      Length (data) {
        let length = data.length
        data.forEach((child) => {
          if (child.children) {
            length += this.Length(child.children)
          }
        })
        return length
      },
      //  返回表头
      renderHeader (column, $index) {
        if ('renderHeader' in this.columns[$index]) {
          return this.columns[$index].renderHeader(column, $index)
        } else {
          return column.title || '#'
        }
      },
      //  返回内容
      renderBody (row, column, index) {
        return row[column.key]
      },
      //  默认选中
      renderCheck (data) {
        let arr = []
        data.forEach((item) => {
          if (item._checked) {
            arr.push(item.id)
          }
          if (item.children && item.children.length > 0) {
            arr = arr.concat(this.renderCheck(item.children))
          }
        })
        return arr
      },
      deepCopy (data) {
        let t = this.type(data)
        let o = []
        let i = 0
        let ni = []
        if (t === 'array') {
          o = []
        } else if (t === 'object') {
          o = {}
        } else {
          return data
        }
        if (t === 'array') {
          for (i = 0, ni = data.length; i < ni; i++) {
            o.push(this.deepCopy(data[i]))
          }
          return o
        } else if (t === 'object') {
          for (i in data) {
            o[i] = this.deepCopy(data[i])
          }
          return o
        }
      },
      type (obj) {
        var toString = Object.prototype.toString
        var map = {
          '[object Boolean]': 'boolean',
          '[object Number]': 'number',
          '[object String]': 'string',
          '[object Function]': 'function',
          '[object Array]': 'array',
          '[object Date]': 'date',
          '[object RegExp]': 'regExp',
          '[object Undefined]': 'undefined',
          '[object Null]': 'null',
          '[object Object]': 'object'
        }
        return map[toString.call(obj)]
      }
    },
    beforeDestroy () {
      window.onresize = null
    }
  }
</script>
<style>
  .autoTbale {
    overflow: auto;
  }
  table {
    width: 100%;
    border-spacing: 0;
    border-collapse: collapse;
  }
  .table-bordered {
    border: 1px solid #EBEBEB;
  }
  .table>tbody>tr>td,
  .table>tbody>tr>th,
  .table>thead>tr>td,
  .table>thead>tr>th {
    border-top: 1px solid #e7eaec;
    line-height: 1.42857;
    padding: 8px;
    vertical-align: middle;
  }
  .table-bordered>tbody>tr>td,
  .table-bordered>tbody>tr>th,
  .table-bordered>tfoot>tr>td,
  .table-bordered>tfoot>tr>th,
  .table-bordered>thead>tr>td,
  .table-bordered>thead>tr>th {
    border: 1px solid #e7e7e7;
  }
  .table>thead>tr>th {
    border-bottom: 1px solid #DDD;
  }
  .table-bordered>thead>tr>td,
  .table-bordered>thead>tr>th {
    background-color: #F5F5F6;
  }
  #hl-tree-table>tbody>tr {
    background-color: #fbfbfb;
  }
  #hl-tree-table>tbody>.child-tr {
    background-color: #fff;
  }
  label {
    margin: 0 8px;
  }
  .ms-tree-space {
    position: relative;
    top: 1px;
    display: inline-block;
    font-style: normal;
    font-weight: 400;
    line-height: 1;
    width: 14px;
    height: 14px;
  }
  .ms-tree-space::before {
    content: ""
  }
  #hl-tree-table th>label {
    margin: 0;
  }
</style>
