vanvue model 组件可拖动指令

 

 

import Vue from 'vue'

// v-drag-modal: 弹窗拖拽
Vue.directive('drag-modal', (el, bindings, vnode) => {
  Vue.nextTick(() => {
    let { 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
    let modal = el.getElementsByClassName('ant-modal')[0]
    let header = el.getElementsByClassName('ant-modal-header')[0]
    let left = 0
    let 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
    // 点击title部分拖动
    header.onmousedown = e => {
      let startX = e.clientX
      let startY = e.clientY
      header.left = header.offsetLeft
      header.top = header.offsetTop
      el.onmousemove = event => {
        let endX = event.clientX
        let 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()
    }
    // 点击表单部分拖动
    // modal.onmousedown = e => {
    //   let startX = e.clientX
    //   let startY = e.clientY
    //   header.left = header.offsetLeft
    //   header.top = header.offsetTop
    //   el.onmousemove = event => {
    //     let endX = event.clientX
    //     let 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()
    // }
  })
})

 

以上写法会造成页面有元素移动速度无法跟上鼠标移动速度时丢失对元素的操作，并且当页面更新时重新加载组件导致组件位置错误。  更改版如下

 

import Vue from 'vue'


// v-drag-modal: 弹窗拖拽
Vue.directive('drag-modal', {
  bind: (el, bindings, vnode) => {
    Vue.nextTick(() => {
      let { 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
      let modal = el.getElementsByClassName('ant-modal')[0]
      let header = el.getElementsByClassName('ant-modal-header')[0]
      let left = 0
      let top = 0
      let canMove = false
      // 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
      // 点击title部分拖动
      header.onmousedown = e => {
        canMove = true
        let startX = e.clientX
        let startY = e.clientY
        header.left = header.offsetLeft
        header.top = header.offsetTop
        window.onmousemove = event => {
          if( canMove ){
            // console.log("头部鼠标移动", event)
            let endX = event.clientX
            let 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'
          }
        }
        window.onmouseup = event => {
          canMove = false
          left = modal.left
          top = modal.top
          el.onmousemove = null
          el.onmouseup = null
          header.releaseCapture && header.releaseCapture()
        }
        header.setCapture && header.setCapture()
      }
      // 点击表单部分拖动
      modal.onmousedown = e => {
        canMove = true
        let startX = e.clientX
        let startY = e.clientY
        header.left = header.offsetLeft
        header.top = header.offsetTop
        window.onmousemove = event => {
          if( canMove ){
            let endX = event.clientX
            let endY = event.clientY
            console.log("内部表单鼠标移动", event, header.left, endX, startX, left, header.left + (endX - startX) + left)
            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'
          }
          
        }
        window.onmouseup = event => {
          canMove = false
          console.log("鼠标抬起", modal.left)
          left = modal.left
          top = modal.top
          el.onmousemove = null
          el.onmouseup = null
          header.releaseCapture && header.releaseCapture()
        }
        header.setCapture && header.setCapture()
      }
    })
  }
}
)

 

 

使用方法:

main.js 引入

import '@/utils/directives.js'

 

model组件使用处直接使用指令

<a-modal 
    :visible="visibleRecording" 
    ref="modalRef"
    title="事件上报" 
    v-drag-modal
>