import Vue from 'vue' // v-dialogDrag: 弹窗拖拽自定义指令，已在main.js引入,使用即可，每个 el-dialog 加指令 Vue.directive('dialogDrag', { bind(el, binding, vnode, oldVnode) { /** * 关闭弹窗可移动 * @type {CustomEvent<string>} */ // return; /** * 打开弹窗可移动 * @type {CustomEvent<string>} */ let resizeEvent = new CustomEvent('drag-resize',{detail:'尺寸变化',bubbles:false}); //初始化不最大化 el.fullscreen = false; //弹框可拉伸最小宽高 let minWidth = 400; let minHeight = 300; //当前宽高 let nowWidth = minWidth; let nowHight = minHeight; //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'); let hasSetBodyHight = false; //弹窗 const dragDom = el.querySelector('.el-dialog'); dragDom.className += ' el-drag-dialog'; //清除选择头部文字效果 dialogHeaderEl.onselectstart = new Function("return false"); //头部加上可拖动cursor dialogHeaderEl.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); //头部插入最大化最小化元素 let maxMin = document.createElement("button"); maxMin.className += ' el-dialog__headerbtn el-dialog__minmax'; maxMin.style.right = '40px'; maxMin.style.color = '#909399'; maxMin.title = el.fullscreen ? '还原' : '最大化'; maxMin.innerHTML = '<i class=' + (el.fullscreen ? '"el-icon-crop"' : '"el-icon-full-screen"') + ' onMouseOver="this.style.color=\'#409EFF\'" onMouseOut="this.style.color=\'inherit\'"></i>'; dialogHeaderEl.insertBefore(maxMin, dialogHeaderEl.childNodes[1]); 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; const screenWidth = document.documentElement.clientWidth || document.body.clientWidth // 页面可视区宽度，兼容写法 const screenHeight = document.documentElement.clientHeight || document.body.clientHeight // 页面可视区高度，兼容写法 const dragDomWidth = dragDom.offsetWidth // 对话框宽度 const dragDomheight = dragDom.offsetHeight // 对话框高度 // 下面四行的是 x轴和y轴最小和最大的移动范围 可基于上面两行设置 const minDragDomLeft = (dragDom.offsetLeft+dragDomWidth/2) // 对话框边界最小left值 const maxDragDomLeft = (screenWidth - dragDom.offsetLeft - dragDomWidth+dragDomWidth/2) // 对话框边界最大left值 const minDragDomTop = dragDom.offsetTop // 对话框边界最小Top值 const maxDragDomTop = (screenHeight - dragDom.offsetTop - dragDomheight+dragDomheight/2) // 对话框边界最大Top值 // 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 (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 let l = e.clientX - disX; let t = e.clientY - disY; // 边界处理 if (-(l) > minDragDomLeft) { l = -(minDragDomLeft) } else if (l > maxDragDomLeft) { l = maxDragDomLeft } if (-(t) > minDragDomTop) { t = -(minDragDomTop) } else if (t > maxDragDomTop) { t = maxDragDomTop } // 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; let bodyHeight = 'auto'; // 最大/最小化 function setMaxMin() { if (el.fullscreen) { let i = maxMin.querySelector('.el-icon-crop'); i.classList.remove('el-icon-crop'); i.classList.add('el-icon-full-screen'); maxMin.innerHTML = '<i class="el-icon-full-screen"></i>'; maxMin.title = '最大化'; dragDom.style.height = "auto"; dragDom.style.width = nowWidth + 'px'; dragDom.style.marginTop = nowMarginTop; el.fullscreen = false; dialogHeaderEl.style.cursor = 'move'; dialogHeaderEl.onmousedown = moveDown; dragDom.querySelector('.el-dialog__body').style.height = bodyHeight; hasSetBodyHight = false; } else { let i = maxMin.querySelector('.el-icon-full-screen'); i.classList.remove('el-icon-full-screen'); i.classList.add('el-icon-crop'); maxMin.title = '还原'; bodyHeight = dragDom.querySelector('.el-dialog__body').offsetHeight + 'px'; 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; el.fullscreen = true; dialogHeaderEl.style.cursor = 'initial'; dialogHeaderEl.onmousedown = null; if (!hasSetBodyHight) { let footerHeight = dragDom.querySelector('.el-dialog__footer') && dragDom.querySelector('.el-dialog__footer').offsetHeight; dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - ' + (dialogHeaderEl.offsetHeight + footerHeight) + 'px)'; hasSetBodyHight = true; } } el.dispatchEvent(resizeEvent); } //点击放大缩小效果 maxMin.onclick = setMaxMin; //双击头部效果 dialogHeaderEl.ondblclick = setMaxMin; //获取弹框底部（这部分可双击全屏） const dialogFooter = el.querySelector('.el-dialog__footer'); if (dialogFooter) { dialogFooter.ondblclick = setMaxMin; } //拉伸 let resizeEl = document.createElement("div"); dragDom.appendChild(resizeEl); //在弹窗右下角加上一个10-10px的控制块 resizeEl.style.cursor = 'se-resize'; resizeEl.style.position = 'absolute'; resizeEl.style.height = '10px'; resizeEl.style.width = '10px'; resizeEl.style.right = '0px'; resizeEl.style.bottom = '0px'; //鼠标拉伸弹窗 resizeEl.onmousedown = (e) => { // 记录初始x位置 const clientX = e.clientX; // 鼠标按下，计算当前元素距离可视区的距离 const disX = e.clientX - resizeEl.offsetLeft; const disY = e.clientY - resizeEl.offsetTop; document.onmousemove = function (e) { // 通过事件委托，计算移动的距离 （开始拖拽至结束拖拽的距离） e.preventDefault(); // 移动时禁用默认事件 // 通过事件委托，计算移动的距离 const x = e.clientX - disX + (e.clientX - clientX);//这里 由于elementUI的dialog控制居中的，所以水平拉伸效果是双倍 const y = e.clientY - disY; //比较是否小于最小宽高 dragDom.style.width = x > minWidth ? `${x}px` : minWidth + 'px'; dragDom.style.height = y > minHeight ? `${y}px` : minHeight + 'px'; if (!hasSetBodyHight) { let footerHeight = dragDom.querySelector('.el-dialog__footer') && dragDom.querySelector('.el-dialog__footer').offsetHeight; dragDom.querySelector('.el-dialog__body').style.height = 'calc(100% - ' + (dialogHeaderEl.offsetHeight + footerHeight) + 'px)'; hasSetBodyHight = true; } }; //拉伸结束 document.onmouseup = function (e) { document.onmousemove = null; document.onmouseup = null; el.dispatchEvent(resizeEvent); }; } }, })
在main.js中引入 import '@/utils/dialog';
其中加了头部和底部双击最大化最小化功能，因为拖动到最顶部时拖动不了，此时双击底部最大化，再缩小即可；
