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import Vue from "vue";// v-dialogDrag: 弹窗拖拽+水平方向伸缩
/** 使用方法* 将以下代码复制到一个js文件中，然后在入口文件main.js中import引入即可；* 给elementUI的dialog上加上 v-dialogDrag 指令就可以实现弹窗的全屏和拉伸了。* 给dialog设置 :close-on-click-modal="false" , 禁止点击遮罩层关闭弹出层* 如果是form表单，不要将提交等按钮放置el-form-item，以免在上下拉伸时被隐藏*/
Vue.directive('dialogDrag', {bind(el, binding, vnode, oldVnode) {//弹框可拉伸最小宽高let minWidth = 400;let minHeight = 300;//初始非全屏let isFullScreen = false;//当前宽高let nowWidth = 0;let nowHight = 0;//当前顶部高度let nowMarginTop = 0;//获取弹框头部（这部分可双击全屏）const dialogHeaderEl = el.querySelector('.el-dialog__header');//弹窗const dragDom = el.querySelector('.el-dialog');//给弹窗加上overflow auto；不然缩小时框内的标签可能超出dialog；dragDom.style.overflow = "auto";//清除选择头部文字效果//dialogHeaderEl.onselectstart = new Function("return false");//头部加上可拖动cursordialogHeaderEl.style.cursor = 'move';// 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);let moveDown = (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;// 获取到的值带px 正则匹配替换let styL, styT;// 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pxif (sty.left.includes('%')) {styL = +document.body.clientWidth * (+sty.left.replace(/\%/g, '') / 100);styT = +document.body.clientHeight * (+sty.top.replace(/\%/g, '') / 100);} else {styL = +sty.left.replace(/\px/g, '');styT = +sty.top.replace(/\px/g, '');};document.onmousemove = function (e) {// 通过事件委托，计算移动的距离const l = e.clientX - disX;const t = e.clientY - disY;// 移动当前元素 dragDom.style.left = `${l + styL}px`;dragDom.style.top = `${t + styT}px`;//将此时的位置传出去//binding.value({x:e.pageX,y:e.pageY})};document.onmouseup = function (e) {document.onmousemove = null;document.onmouseup = null;};}dialogHeaderEl.onmousedown = moveDown;//双击头部全屏效果dialogHeaderEl.ondblclick = (e) => {if (isFullScreen == false) {nowHight = dragDom.clientHeight;nowWidth = dragDom.clientWidth;nowMarginTop = dragDom.style.marginTop;dragDom.style.left = 0;dragDom.style.top = 0;dragDom.style.height = "100VH";dragDom.style.width = "100VW";dragDom.style.marginTop = 0;isFullScreen = true;dialogHeaderEl.style.cursor = 'initial';dialogHeaderEl.onmousedown = null;} else {dragDom.style.height = "auto";dragDom.style.width = nowWidth + 'px';dragDom.style.marginTop = nowMarginTop;isFullScreen = false;dialogHeaderEl.style.cursor = 'move';dialogHeaderEl.onmousedown = moveDown;}}dragDom.onmousemove = function (e) {let moveE = e;if (e.clientX > dragDom.offsetLeft + dragDom.clientWidth - 10 || dragDom.offsetLeft + 10 > e.clientX) {dragDom.style.cursor = 'w-resize';} else if (el.scrollTop + e.clientY > dragDom.offsetTop + dragDom.clientHeight - 10) {dragDom.style.cursor = 's-resize';} else {dragDom.style.cursor = 'default';dragDom.onmousedown = null;}dragDom.onmousedown = (e) => {const clientX = e.clientX;const clientY = e.clientY;let elW = dragDom.clientWidth;let elH = dragDom.clientHeight;let EloffsetLeft = dragDom.offsetLeft;let EloffsetTop = dragDom.offsetTop;dragDom.style.userSelect = 'none';let ELscrollTop = el.scrollTop;//判断点击的位置是不是为头部if (clientX > EloffsetLeft && clientX < EloffsetLeft + elW && clientY > EloffsetTop && clientY < EloffsetTop + 100) {//如果是头部在此就不做任何动作，以上有绑定dialogHeaderEl.onmousedown = moveDown;} else {document.onmousemove = function (e) {e.preventDefault(); // 移动时禁用默认事件//左侧鼠标拖拽位置if (clientX > EloffsetLeft && clientX < EloffsetLeft + 10) {//往左拖拽if (clientX > e.clientX) {dragDom.style.width = elW + (clientX - e.clientX) * 2 + 'px';}//往右拖拽if (clientX < e.clientX) {if (dragDom.clientWidth < minWidth) {} else {dragDom.style.width = elW - (e.clientX - clientX) * 2 + 'px';}}}//右侧鼠标拖拽位置if (clientX > EloffsetLeft + elW - 10 && clientX < EloffsetLeft + elW) {//往左拖拽if (clientX > e.clientX) {if (dragDom.clientWidth < minWidth) {} else {dragDom.style.width = elW - (clientX - e.clientX) * 2 + 'px';}}//往右拖拽if (clientX < e.clientX) {dragDom.style.width = elW + (e.clientX - clientX) * 2 + 'px';}}//底部鼠标拖拽位置if (ELscrollTop + clientY > EloffsetTop + elH - 20 && ELscrollTop + clientY < EloffsetTop + elH) {//往上拖拽if (clientY > e.clientY) {if (dragDom.clientHeight < minHeight) {} else {dragDom.style.height = elH - (clientY - e.clientY) * 2 + 'px';}}//往下拖拽if (clientY < e.clientY) {dragDom.style.height = elH + (e.clientY - clientY) * 2 + 'px';}}};//拉伸结束document.onmouseup = function (e) {document.onmousemove = null;document.onmouseup = null;};}}}}
})
// 注意引入在 Vue的下面借鉴大佬的
原地址：
https://blog.csdn.net/weixin_41181778/article/details/105182382?ops_request_misc=&request_id=7200d8d086874d36bd146a9cd0a0ae57&biz_id=&utm_medium=distribute.pc_search_result.none-task-blog-2allkoosearch~default-17-105182382-null-null.142v92koosearch_v1&utm_term=%E9%A5%BF%E4%BA%86%E4%B9%88ui%E5%AF%B9%E7%9A%84dailog%E8%AE%BE%E7%BD%AE%E5%8F%AF%E7%A7%BB%E5%8A%A8%E5%92%8C%E7%BC%A9%E6%94%BE&spm=1018.2226.3001.4187