import Vue from 'vue'// v-dialogDrag: 弹窗拖拽属性 （重点！！！ 给模态框添加这个属性模态框就能拖拽了）
Vue.directive('dialogDrag', {// 属性名称dialogDrag，前面加v- 使用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.offsetLeftconst disY = e.clientY - dialogHeaderEl.offsetTopconst dragDomWidth = dragDom.offsetWidth// const dragDomHeight = dragDom.offsetHeightconst screenWidth = document.body.clientWidthconst screenHeight = document.body.clientHeightconst minDragDomLeft = dragDom.offsetLeftconst maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidthconst minDragDomTop = dragDom.offsetTop// const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomHeightconst maxDragDomTop = screenHeight - dragDom.offsetTop // 不需要-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 - disXlet 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 eventvnode.child.$emit('dragDialog')}document.onmouseup = function (e) {document.onmousemove = nulldocument.onmouseup = null}}}
})