Vue3 + Ant Design Vue Modal 对话框可拖拽指令

blog.csdn.net/weixin_5065…

指令

• /directives/draggable.js

import { nextTick } from 'vue'

// directives/draggable.js
export const draggable = {
  async mounted(el, binding) {
    await nextTick()
    // 获取对应DOM
    const dialogHeaderEl = el.querySelector('.ant-modal-header') // 类名一定要替换成自己的 我本地改了前缀
    const dragDom = el.querySelector('.ant-modal') // 类名一定要替换成自己的 我本地改了前缀
    dialogHeaderEl.style.cssText += ';cursor:move;'

    // 获取原有属性 火狐谷歌 window.getComputedStyle(dom元素, null);
    const sty = (function () {
      return (dom, attr) => getComputedStyle(dom, null)[attr]
    })()

    dialogHeaderEl.addEventListener('mousedown', (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 = Number(document.body.clientWidth) * (Number(styL.replace(/%/g, '')) / 100)
        styT = Number(document.body.clientHeight) * (Number(styT.replace(/%/g, '')) / 100)
      } else {
        styL = Number(styL.replace(/px/g, ''))
        styT = Number(styT.replace(/px/g, ''))
      }

      const fn = (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.addEventListener('mousemove', fn)

      document.addEventListener('mouseup', (e) => {
        document.removeEventListener('mousemove', fn)
      })

      return false
    })
  },
}

注册指令

• /main.js

import { draggable } from './directives/draggable'

app.directive('draggable', draggable)

使用指令

• demo.vue

<div ref='modalBox' v-draggable>
    <a-modal
          v-model:open='visible' title='编辑' ok-text='保存'
          :get-container='() => $refs.modalBox'
          :force-render='true'
          @ok='onSave'
        >
     </a-modal>
</div>