Antd与ElementUI的弹窗拖拽

将以下文件引入main.js中, 在使用antd或者elmentUI时的弹窗组件时, 运用以下方式

// 引入时
import './utils/AntdModaldrag' // a-modal可拖拽
import './utils/ElDialogDrag' // el-dialog可拖拽

//使用时
<a-modal v-drag-modal></a-modal>
<el-dialog v-dialogDrag></el-dialog>

Antd弹窗

import Vue from 'vue'
  Vue.directive('drag-modal', (el, bindings, vnode) => {
    Vue.nextTick(() => {
      var { visible, destroyOnClose } = vnode.componentInstance
      // 防止未定义 destroyOnClose 关闭弹窗时dom未被销毁，指令被重复调用
      if (!visible) return
      var modal = el.getElementsByClassName('ant-modal')[0]
      var header = el.getElementsByClassName('ant-modal-header')[0]
      var left = 0
      var top = 0

      // 未定义 destroyOnClose 时，dom未被销毁，关闭弹窗再次打开，弹窗会停留在上一次拖动的位置
      if (!destroyOnClose) {
        left = modal.left || 0
        top = modal.top || 0
      }
      // top 初始值为 offsetTop
      top = top || modal.offsetTop
      header.onmousedown = e => {
        var startX = e.clientX
        var startY = e.clientY
        header.left = header.offsetLeft
        header.top = header.offsetTop
        el.onmousemove = event => {
          var endX = event.clientX
          var endY = event.clientY
          modal.left = header.left + (endX - startX) + left
          modal.top = header.top + (endY - startY) + top
          modal.style.left = modal.left + 'px'
          modal.style.top = modal.top + 'px'
        }
        el.onmouseup = event => {
          left = modal.left
          top = modal.top
          el.onmousemove = null
          el.onmouseup = null
          header.releaseCapture && header.releaseCapture()
        }
        header.setCapture && header.setCapture()
      }
    })
  })

Element-UI弹窗

import Vue from 'vue'
// v-dialogDrag: 弹窗拖拽
Vue.directive('dialogDrag', {
  bind(el, binding, vnode, oldVnode) {
    const dialogHeaderEl = el.querySelector('.el-dialog__header')
    const dragDom = el.querySelector('.el-dialog')
    dialogHeaderEl.style.cursor = 'move'

    // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
    const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null)

    dialogHeaderEl.onmousedown = (e) => {
      // 鼠标按下，获得鼠标在盒子内的坐标（鼠标在页面的坐标 减去 对话框的坐标），计算当前元素距离可视区的距离
      const disX = e.clientX - dialogHeaderEl.offsetLeft
      const disY = e.clientY - dialogHeaderEl.offsetTop

      // 获取到的值带px 正则匹配替换
      let styL, styT

      // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
      if (sty.left.includes('%')) {
        styL = +document.body.clientWidth * (+sty.left.replace(/%/g, '') / 100)
        styT = +document.body.clientHeight * (+sty.top.replace(/%/g, '') / 100)
      } else {
        styL = +sty.left.replace(/\px/g, '')
        styT = +sty.top.replace(/\px/g, '')
      }

      document.onmousemove = function(e) {
        // 鼠标移动，用鼠标在页面的坐标 减去 鼠标在盒子里的坐标，获得模态框的left和top值
        // 通过事件委托，计算移动的距离
        const l = e.clientX - disX
        const t = e.clientY - disY

        // 移动当前元素
        dragDom.style.left = `${l + styL}px`
        dragDom.style.top = `${t + styT}px`

        // 将此时的位置传出去
        // binding.value({x:e.pageX,y:e.pageY})
      }

      document.onmouseup = function(e) {
        //  鼠标弹起，移除鼠标移动事件
        document.onmousemove = null
        document.onmouseup = null
      }
    }
  }
})