Use element-ui el-dialog in Vue to maximize and restore the pop-up window, drag and drop, and dynamically change the size

1. To create the corresponding js file,
     first create the js file in the specified stable file, such as creating a diaLog.js file under src, some of which will prompt red bursts, which can be ignored, and can be modified according to requirements, such as: the minimum width and height of the bullet box can be stretched .

export default {
  bind (el, binding, vnode, oldVnode) {
    const resizeEvent = new CustomEvent('drag-resize', {
      detail: '尺寸变化',
      bubbles: false
    })
    // 初始化不最大化
    el.fullscreen = false
    // 弹框可拉伸最小宽高
    const minWidth = 1100
    const minHeight = 570
    // 当前宽高
    let nowWidth = minWidth
    // eslint-disable-next-line no-unused-vars
    let nowHight = minHeight
    // 当前顶部高度
    let nowMarginTop = 0
    // 获取弹框头部（这部分可双击全屏）
    const dialogHeaderEl = el.querySelector('.el-dialog__header')
    let hasSetBodyHight = false
    // 弹窗
    const dragDom = el.querySelector('.el-dialog')
    el.style.overflow='initial'
    dragDom.className += ' el-drag-dialog'
    console.log(el)
    // 给弹窗加上overflow auto；不然缩小时框内的标签可能超出dialog；
    dragDom.style.overflow = 'auto'
    // 清除选择头部文字效果
    // eslint-disable-next-line no-new-func
    dialogHeaderEl.onselectstart = new Function('return false')
    // 头部加上可拖动cursor
    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)

    // 头部插入最大化最小化元素
    const maxMin = document.createElement('button')
    maxMin.className += ' el-dialog__headerbtn el-dialog__minmax'
    maxMin.style.right = '40px'
    maxMin.style.color = '#ffffff'
    maxMin.title = el.fullscreen ? '还原' : '最大化'
    maxMin.innerHTML = '<i class=' + (el.fullscreen ? '"el-icon-crop"' : '"el-icon-full-screen"') + ' onMouseOver="this.style.color=\'#409EFF\'" onMouseOut="this.style.color=\'inherit\'"></i>'
    dialogHeaderEl.insertBefore(maxMin, dialogHeaderEl.childNodes[1])
    const moveDown = (e) => {
      // 鼠标按下，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) {
        // 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) {
        document.onmousemove = null
        document.onmouseup = null
      }
    }
    dialogHeaderEl.onmousedown = moveDown
    let bodyHeight = 'auto'

    function setMaxMin () {
      if (el.fullscreen) {
        let i = maxMin.querySelector('.el-icon-crop');
        i.classList.remove('el-icon-crop');
        i.classList.add('el-icon-full-screen');
        maxMin.innerHTML = '<i class="el-icon-full-screen"></i>';
        maxMin.title = '最大化';
        dragDom.style.height = nowHight + 'px';
        dragDom.style.width = nowWidth + 'px';
        dragDom.style.marginTop = window.innerHeight*0.07+'px';
        el.fullscreen = false;
        dialogHeaderEl.style.cursor = 'move';
        dialogHeaderEl.onmousedown = moveDown;
        // dragDom.querySelector('.el-dialog__body').style.height = bodyHeight;
        hasSetBodyHight = false;
      } else {
        const i = maxMin.querySelector('.el-icon-full-screen')
        i.classList.remove('el-icon-full-screen')
        i.classList.add('el-icon-crop')
        maxMin.title = '还原'
        bodyHeight = dragDom.querySelector('.el-dialog__body').offsetHeight + 'px'
        nowHight = dragDom.clientHeight
        nowWidth = dragDom.clientWidth
        nowMarginTop = dragDom.style.marginTop
        dragDom.style.left = 0
        dragDom.style.top = 0
        dragDom.style.height = window.innerHeight + 'px'
        dragDom.style.width = '100VW'
        dragDom.style.marginTop = 0
        el.fullscreen = true
        dialogHeaderEl.style.cursor = 'initial'
        dialogHeaderEl.onmousedown = null
        if (!hasSetBodyHight) {
          const footerHeight = dragDom.querySelector('.el-dialog__footer') && dragDom.querySelector('.el-dialog__footer').offsetHeight
          dragDom.querySelector('.el-dialog__body').style.height =
           'calc(90% - ' + (dialogHeaderEl.offsetHeight + footerHeight) + 'px)'
/*          dragDom.querySelector('.el-dialog__body').style.height =
            window.innerHeight*0.9
             - (dialogHeaderEl.offsetHeight + footerHeight) + 'px'*/
          hasSetBodyHight = true
        }
      }
      el.dispatchEvent(resizeEvent)
    }

    // 点击放大缩小效果
    maxMin.onclick = setMaxMin
    // 双击头部效果
    dialogHeaderEl.ondblclick = setMaxMin
    // 拉伸
    const resizeEl = document.createElement('div')
    dragDom.appendChild(resizeEl)
    // 在弹窗右下角加上一个10-10px的控制块
    resizeEl.style.cursor = 'se-resize'
    resizeEl.style.position = 'absolute'
    resizeEl.style.height = '10px'
    resizeEl.style.width = '10px'
    resizeEl.style.right = '0px'
    resizeEl.style.bottom = '0px'
    resizeEl.style.zIndex = '99';
    // 鼠标拉伸弹窗
    resizeEl.onmousedown = (e) => {
      // 记录初始x位置
      const clientX = e.clientX
      // 鼠标按下，计算当前元素距离可视区的距离
      const disX = e.clientX - resizeEl.offsetLeft
      const disY = e.clientY - resizeEl.offsetTop
      document.onmousemove = function (e) {
        e.preventDefault() // 移动时禁用默认事件
        // 通过事件委托，计算移动的距离
        const x = e.clientX - disX + (e.clientX - clientX)// 这里 由于elementUI的dialog控制居中的，所以水平拉伸效果是双倍
        const y = e.clientY - disY
        // 比较是否小于最小宽高
        dragDom.style.width = x > minWidth ? `${x}px` : minWidth + 'px'
        dragDom.style.height = y > minHeight ? `${y}px` : minHeight + 'px'
        if (!hasSetBodyHight) {
          const footerHeight = dragDom.querySelector('.el-dialog__footer') && dragDom.querySelector('.el-dialog__footer').offsetHeight
          dragDom.querySelector('.el-dialog__body').style.height = 'calc(90% - ' + (dialogHeaderEl.offsetHeight + footerHeight) + 'px)'
          hasSetBodyHight = true
        }
      }
      // 拉伸结束
      document.onmouseup = function (e) {
        document.onmousemove = null
        document.onmouseup = null
        el.dispatchEvent(resizeEvent)
      }
    }
  }
}

 

2. Reference in main.js

  At the same time, in order to prevent conflicts, it is necessary to close the closeOnClickModal (the default click mask of the pop-up window is changed to not close), and add a label event.

import elDragDialog from './dialog'
Vue.directive('el-drag-dialog', elDragDialog);//添加标签事件绑定 可以放大移动弹窗
//弹窗默认点击遮罩改为不关闭 为了防止和拖拽冲突 ，这句需要放在use ElementUI之前（也可以不加这句，自己测试区别）
ElementUI.Dialog.props.closeOnClickModal.default = false;

 

3. Application in el-el-dialog

  Add v-el-drag-dialog to the corresponding el-dialog tag.

 <el-dialog
      :lock-scroll="false"
      :close-on-press-escape="false"
      :close-on-click-modal="false"
      :visible.sync="show"
      v-el-drag-dialog>
</el-dialog>

 

4. The effect
  can be dragged to customize the size through the lower right corner, and double-click the title to maximize it. 

 

 

​​​​​​​​Reference link