export default {
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bind(el, binding, vnode) {
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const dialogHeaderEl = el.querySelector('.el-dialog__header')
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const dragDom = el.querySelector('.el-dialog')
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dialogHeaderEl.style.cssText += ';cursor:move;'
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dragDom.style.cssText += ';top:0px;'
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// 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
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const getStyle = (function() {
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if (window.document.currentStyle) {
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return (dom, attr) => dom.currentStyle[attr]
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} else {
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return (dom, attr) => getComputedStyle(dom, false)[attr]
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}
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})()
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dialogHeaderEl.onmousedown = (e) => {
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// 20211019 long 弹窗高度大于屏幕可视高度时 禁止拖拽
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if (dragDom.offsetHeight > document.body.clientHeight) return
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// 鼠标按下，计算当前元素距离可视区的距离
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const disX = e.clientX - dialogHeaderEl.offsetLeft
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const disY = e.clientY - dialogHeaderEl.offsetTop
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const dragDomWidth = dragDom.offsetWidth
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const dragDomHeight = dragDom.offsetHeight
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const screenWidth = document.body.clientWidth
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const screenHeight = document.body.clientHeight
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const minDragDomLeft = dragDom.offsetLeft
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const maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth
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const minDragDomTop = dragDom.offsetTop
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const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomHeight
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// 获取到的值带px 正则匹配替换
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let styL = getStyle(dragDom, 'left')
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let styT = getStyle(dragDom, 'top')
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if (styL.includes('%')) {
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styL = +document.body.clientWidth * (+styL.replace(/\%/g, '') / 100)
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styT = +document.body.clientHeight * (+styT.replace(/\%/g, '') / 100)
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} else {
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styL = +styL.replace(/\px/g, '')
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styT = +styT.replace(/\px/g, '')
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}
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document.onmousemove = function(e) {
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// 通过事件委托，计算移动的距离
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let left = e.clientX - disX
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let top = e.clientY - disY
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// 边界处理
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if (-(left) > minDragDomLeft) {
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left = -minDragDomLeft
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} else if (left > maxDragDomLeft) {
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left = maxDragDomLeft
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}
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if (-(top) > minDragDomTop) {
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top = -minDragDomTop
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} else if (top > maxDragDomTop) {
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top = maxDragDomTop
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}
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// 移动当前元素
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dragDom.style.cssText += `;left:${left + styL}px;top:${top + styT}px;`
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// emit onDrag event
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vnode.child.$emit('dragDialog')
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}
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document.onmouseup = function(e) {
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document.onmousemove = null
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document.onmouseup = null
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}
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}
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}
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}
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