element UI dialog 组件是不允许用户进行上下左右拖拽的
目标: 使用vue 自定义指令 实现element dialog组件的拖拽效果
1 实现步骤:
创建自定义指令
在utils文件夹下新建文件夹 utils/directive/el-dragDialog/index.js
/* dialog 拖拽 */
import Vue from 'vue'
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
utils/directive/el-dragDialog/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
}
}
}
}
2 文件结构:
3 使用:
第一种:单文件引入使用
<el-dialog v-el-drag-dialog> ... </el-dialog>
.....
import elDragDialog from '../../utils/directive/el-dragDialog'
....
directives: {
elDragDialog
},
如图
第二种:全局注册,不需要在每一个用到dialog 拖拽的文件中引入
main.js 文件中
import drag from './utils/directive/el-dragDialog/drag'
Vue.directive('el-drag-dialog', drag) // 注册全局 dialog 拖拽指令
main.js 引入图
使用图
完~
参考资料:https://blog.csdn.net/RoddyLD/article/details/120885599