通过自定义指令实现 ant-design-vue 的a-modal弹窗可拖动

文章目录

一、创建drag.js文件

二、使用步骤

1.全局使用，在main.js中引入drag

2.代码中使用

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一、创建drag.js文件

import Vue from 'vue'

// 自定义指令使弹窗可拖动
// 使用方式: 
// 加上v-drag-modal 一定要加上destroyoncLose属性，否则弹窗不会回到初始位置
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 footer = el.getElementsByClassName('ant-modal-footer')[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
    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();
    },
    footer.onmousedown = e => {
      let startX = e.clientX;
      let startY = e.clientY;
      footer.left = footer.offsetLeft;
      footer.top = footer.offsetTop;
      el.onmousemove = event => {
        let endX = event.clientX;
        let endY = event.clientY;
        modal.left = footer.left + (endX - startX) + left;
        modal.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;
        footer.releaseCapture && footer.releaseCapture();
      }
      footer.setCapture && footer.setCapture();
    }
  })
})

二、使用步骤

1.全局使用，在main.js中引入drag

import '@/utils/drag'

2.代码中使用

需要注意的是使用 a-modal 的时候需要加入两个东西一个指令和一个属性

添加destroynClose属性表示关闭弹窗后销毁

    
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参考链接：

antd vue 的 modal 组件 自定义可拖拽指令_半生瓜i的博客-CSDN博客