start: -1,
end: -1,
move: -1,
dragging: false,
direction: undefined
}
},
// 拖动中
handleMouseMove (e, column) {
if (this.dragState.dragging) {
let index = parseInt(column.columnKey) // 记录起始列
if (index - this.dragState.start !== 0) {
this.dragState.direction = index - this.dragState.start < 0 ? 'left' : 'right' // 判断拖动方向
this.dragState.move = parseInt(column.columnKey)
} else {
this.dragState.direction = undefined
}
} else {
return false
}
},
// 拖动易位
dragColumn ({start, end, direction}) {
let tempData = [] let left = direction === 'left'
let min = left ? end : start - 1
let max = left ? start + 1 : end
for (let i = 0; i < this.tableHeader.length; i++) {
if (i === end) {
tempData.push(this.tableHeader[start])
} else if (i > min && i < max) {
tempData.push(this.tableHeader[ left ? i - 1 : i + 1 ])
} else {
tempData.push(this.tableHeader[i])
}
}
this.tableHeader = tempData
},
五、虚线效果
在拖动过程中，通过 mousemove 事件，改变当前列的表头状态
然后借助 headerCellClassName 动态修改其 class
headerCellClassName ({column, columnIndex}) {
return (columnIndex - 1 === this.dragState.move ? `darg_active_${this.dragState.direction}` : '')
}
这个 class 会添加到表头单元格 <th> 上，通过这个 class 给上面的空标签 <span class=”virtual”> 添加虚线即可
贴一下我自己写的完整样式（使用了 sass 作为编译工具）：
<style lang="scss">
.w-table {
.el-table th {
padding: 0;
.virtual{
position: fixed;
display: block;
width: 0;
height: 0;
margin-left: -10px;
z-index: 99;
background: none;
border: none;
}
&.darg_active_left {
.virtual {
border-left: 2px dotted #666;
}
}
&.darg_active_right {
.virtual {
border-right: 2px dotted #666;
}
}
}
.thead-cell {
padding: 0;
display: inline-flex;
flex-direction: column;
align-items: left;
cursor: pointer;
overflow: initial;
&:before {
content: "";
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
}
}
&.w-table_moving {
.el-table th .thead-cell{
cursor: move !important;
}
.el-table__fixed {
cursor: not-allowed;
}
}
}
六、父组件调用
<template>
<div>
<wTable :data="tableData" :header="tableHeader" :option="tableOption">
