vue3自定义对话框组件实现

通过自定义指令的方式封装的自定义弹出框如下（没有加遮罩）：

<template>
  <div class="popupBox" v-drags="draggable" v-if="visible">
    <div ref="dialogRef" class="ZHElelmessage_content dialog_content message_box" :class="className"
      :style="{ top: top, width: width, zIndex: zIndex + 'important' }">
      <div class="flex-box" style="justify-content: center; position: relative">
        <slot name="title_left"></slot>
        <div class="ZHElelmessage_header dialog_header" :style="{ padding: topPadding }">
          <slot name="header">
            <div>{{ title }}</div>
          </slot>
        </div>
        <slot name="title_right"></slot>
      </div>

      <div class="solt-content" :style="{
        padding: padding,
      }">
        <slot> </slot>
      </div>
    </div>
  </div>
</template>
<!-- 使用
<ZHMessage
    :title='标题'
    :width="'550px'"
    :visible='开关'
    :top='15vh'
    @closeDialog='关闭开关'
/>
-->

<script setup>
import {
  ref,
  reactive,
  getCurrentInstance,
  defineEmits,
  defineProps,
  onMounted,
} from "vue";
const dialogRef = ref();
const emit = defineEmits(["closeDialog", "ChangeTop"]);
const props = defineProps({
  title: {
    type: String,
    default: "标题",
  },
  width: {
    type: String || Number,
    default: "440px",
  },
  visible: {
    type: Boolean,
    default: false,
  },
  /**添加类名 */
  className: {
    type: String,
    default: "",
  },
  top: {
    type: String,
    default: "15vh",
  },
  /**图层z轴坐标 */
  zIndex: {
    type: String || Number,
    default: "9000",
  },
  draggable: {
    type: Boolean,
    default: true,
  },
  leftSide: {
    type: Number || String,
    default: "0px",
  },
  topSide: {
    type: [Number, String],
    default: "0px",
  },
  /**主内容内边距 */
  padding: {
    type: String,
    default: "20px 20px 20px",
  },
  /**头部内边距 */
  topPadding: {
    type: String,
    default: "10px 20px",
  },
  isPosition: {
    type: Boolean,
    default: false,
  },
});
const ChangeTop = (val) => {
  emit("ChangeTop", val);
};
const newTop = ref("");
/**自定义拖动对话框指令（局部） */
const vDrags = {
  mounted(el, binding) {
    // 自定义属性，判断是否可拖拽
    if (!binding.value) return;
    const dialogHeaderEl = el.querySelector(".dialog_header");
    const dragDom = el.querySelector(".dialog_content");
    dialogHeaderEl.style.cssText += ";cursor:move;";
    // dragDom.style.cssText += ';bottom:0px;'

    // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
    const sty = (function () {
      if (document.body.currentStyle) {
        // 在ie下兼容写法
        return (dom, attr) => dom.currentStyle[attr];
      }
      return (dom, attr) => getComputedStyle(dom, null)[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");
      // 为兼容ie
      if (styL === "auto") styL = "0px";
      let styT = sty(dragDom, "top");

      // console.log(styL)
      // 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;`;

        ChangeTop(top + styT);
      };

      document.onmouseup = function (e) {
        document.onmousemove = null;
        document.onmouseup = null;
      };
      return false;
    };
  },
};
onMounted(() => {
  if (props.isPosition) {
    dialogRef.value.style.setProperty("--ZHWidth", props.width);
    dialogRef.value.style.setProperty("--ZHTop", props.top);
    dialogRef.value.style.setProperty("--ZHLeftOffect", props.leftSide);
    dialogRef.value.style.setProperty("--ZHTopOffect", props.topSide);
  }
});
defineExpose({
  newTop,
});
/**提交回调事件 */
const submitPopupData = () => { };
</script>

<style scoped lang="less">
@dialogWidth: var(--ZHWidth, 330px);
@dialogTop: var(--ZHTop, 15vh);
@dialogLeftOffset: var(--ZHLeftOffect, 0px);
@dialogTopOffset: var(--ZHTopOffect, 0px);

.ZHElelmessage_header {
  width: 0;
  flex: 1;
  // padding: 10px 20px;
  background-color: #e9e9eb;
  border-radius: 5px 5px 0 0;
  // margin-bottom: 20px;
  font-size: 18px;
}

.ZHElelmessage_content {
  position: fixed;
  width: @dialogWidth;
  top: calc(@dialogTop + @dialogTopOffset);
  left: calc(50% - @dialogWidth / 2 + @dialogLeftOffset);
  box-shadow: 1px 5px 14px #a8abb2;
  z-index: 20000 !important;
  background-color: white;
}

.solt-content {
  font-size: 16px;
}
</style>