Dialog拖动写法

1、在src\directive文件夹里新增一个文件夹el-dragDialog
在新el-dragDialog文件夹里增加drag.js、index.js两个JS文件

image.png

drag.js

export default{
    bind(el, binding, vnode) {
      const dialogHeaderEl = el.querySelector('.el-dialog__header')
      const dragDom = el.querySelector('.el-dialog')
      dialogHeaderEl.style.cssText += ';cursor:move;'
      dragDom.style.cssText += ';top:0px;'
  
      // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
      const getStyle = (function() {
        if (window.document.currentStyle) {
          return (dom, attr) => dom.currentStyle[attr]
        } else {
          return (dom, attr) => getComputedStyle(dom, false)[attr]
        }
      })()
  
      dialogHeaderEl.onmousedown = (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
  
        const dragDomWidth = dragDom.offsetWidth
        const dragDomheight = dragDom.offsetHeight
  
        const screenWidth = document.body.clientWidth
        const screenHeight = document.body.clientHeight
  
        const minDragDomLeft = dragDom.offsetLeft
        const maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth
  
        const minDragDomTop = dragDom.offsetTop
        const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomheight
  
        // 获取到的值带px 正则匹配替换
        let styL = getStyle(dragDom, 'left')
        let styT = getStyle(dragDom, 'top')
  
        if (styL.includes('%')) {
          styL = +document.body.clientWidth * (+styL.replace(/%/g, '') / 100)
          styT = +document.body.clientHeight * (+styT.replace(/%/g, '') / 100)
        } else {
          styL = +styL.replace(/\px/g, '')
          styT = +styT.replace(/\px/g, '')
        }
  
        document.onmousemove = function(e) {
          // 通过事件委托，计算移动的距离
          let left = e.clientX - disX
          let top = e.clientY - disY
  
          // 边界处理
          if (-(left) > minDragDomLeft) {
            left = -minDragDomLeft
          } else if (left > maxDragDomLeft) {
            left = maxDragDomLeft
          }
  
          if (-(top) > minDragDomTop) {
            top = -minDragDomTop
          } else if (top > maxDragDomTop) {
            top = maxDragDomTop
          }
  
          // 移动当前元素
          dragDom.style.cssText += `;left:${left + styL}px;top:${top + styT}px;`
  
          // emit onDrag event
          vnode.child.$emit('dragDialog')
        }
  
        document.onmouseup = function() {
          document.onmousemove = null
          document.onmouseup = null
        }
      }
    }
  }

index.js

import drag from './drag'

const install = function(Vue) {
  Vue.directive('el-drag-dialog', drag)
}

if (window.Vue) {
  window['el-drag-dialog'] = drag
  Vue.use(install);
}

drag.install = install
export default drag

对话框界面代码

//el-dialog属性里增加v-el-drag-dialog
<el-dialog
        title=""
        class="mycontrol2"
        v-el-drag-dialog
        :visible.sync="dialogVisible"
        width="900px"
        :modal="false"
        :close-on-click-modal="false"
        append-to-body
        :before-close="handleClose"
        :show-close="false"
        >
        <div class="" style="position: absolute;">
        <a  class="control_close" @click="dialogVisible = false" circle><i class="el-icon-close"></i></a>
          <control v-if="dialogVisible" :camera-id="cameraId" :camera-name="cameraName"/>
        </div>
      </el-dialog>

  //引入可拖动弹窗脚本
  import elDragDialog from "@/directive/el-dragDialog"
<script>
export default {
    //弹窗拖动
    directives: {  elDragDialog, },
data() {
      return {
// 弹窗显示
        dialogVisible: false,
｝
｝
</script>

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

DIV拖动效果做法

在main.js里全局增加

// 拖动效果//////////////////////////////////////
Vue.directive( 'drag', (obj, binding) =>{
  obj.onmousedown = function(el){
    var left = obj.offsetLeft;
    var top = obj.offsetTop;
    var width = obj.offsetWidth;
    var height = obj.offsetHeight;

    //计算出鼠标的位置与元素位置的差值。
    var cleft = el.clientX - left;
    var ctop = el.clientY - top;

    document.onmousemove = function (doc) {
      //计算出移动后的坐标。
      var moveLeft = doc.clientX - cleft;
      var moveTop = doc.clientY - ctop;

      //设置成绝对定位，让元素可以移动。
      obj.style.position = "absolute";

      //当移动位置在范围内时，元素跟随鼠标移动。
      obj.style.left = moveLeft + "px";
      obj.style.top = moveTop + "px";
    }

    document.onmouseup = function () {
      document.onmousemove = function () { }
    };
  }
});
// end 拖动效果//////////////////////////////////////

引用方法

<div class="mydragDIV"   v-drag>
      内容在这里
</div>