element dialog 二次封装

<template>
  <el-dialog
    v-bind="$attrs"
    v-on="$listeners"
    v-drag="$attrs.drag"
    v-if="$attrs.visible"
    class="mydialog"
    :append-to-body="appendToBody"
    :close-on-click-modal="closeOnClickModal"
    :close-on-press-escape="closeOnPressEscape"
    :title="title"
  >
    <!-- 遍历子组件非作用域插槽，并对父组件暴露 -->
    <template v-for="(index, name) in $slots" :slot="name">
      <slot :name="name" />
    </template>
    <!-- 遍历子组件作用域插槽，并对父组件暴露 -->
    <!-- v-slot:[name]="data" -->
    <!-- <template v-for="(index, name) in $scopedSlots"   >
      <slot :name="name" v-bind="data" v-slot:[name]="data"></slot>
    </template>-->
  </el-dialog>
</template>

<script>
export default {
  name: "mydialog",
  props: {
    appendToBody: {
      type: Boolean,
      default: true,
    },
    title: {
      type: String,
      default: "查看",
    },
    closeOnClickModal: {
      type: Boolean,
      default: false,
    },

    closeOnPressEscape: {
      type: Boolean,
      default: false,
    },
  },

  directives: {
    drag: {
      bind(el, binding, vnode, oldVnode) {
        // console.log(binding.value);
        if (binding.value === false) {
          return;
        }
        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 sty = (() => {
          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 screenWidth = document.body.clientWidth; // body当前宽度
          const screenHeight = document.documentElement.clientHeight; // 可见区域高度(应为body高度，可某些环境下无法获取)

          const dragDomWidth = dragDom.offsetWidth; // 对话框宽度
          const dragDomheight = dragDom.offsetHeight; // 对话框高度

          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 = sty(dragDom, "left");
          let styT = sty(dragDom, "top");

          // 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 (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;`;
          };

          document.onmouseup = function (e) {
            document.onmousemove = null;
            document.onmouseup = null;
          };
        };
      },
    },
  },
};
</script>

<style scoped lang='scss'>
</style>

 <mydialog
      title="555"
      width="50%"
      :append-to-body="true"
      :visible.sync="visible"
      :before-close="handleClose"
      :drag="true"
    >
      1111body
      <span slot="footer" class="dialog-footer">
        <el-button type="primary" @click="visible=false"></el-button>
      </span>
    </mydialog>