// 拖拽的指令
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const drag = {
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beforeMount(el: any, binding: any) {
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// 自定义属性，判断是否可拖拽
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if (!binding.value) return
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const dragDom = el.querySelector('.drag_content')
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const dialogHeaderEl = el.querySelector('.drag_header')
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dialogHeaderEl.style.cssText += ';cursor:move;'
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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 sty = (function () {
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if ((document.body as any).currentStyle) {
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// 在ie下兼容写法
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return (dom: any, attr: any) => dom.currentStyle[attr]
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}
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return (dom: any, attr: any) => getComputedStyle(dom, null)[attr]
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})()
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dialogHeaderEl.onmousedown = (e: any) => {
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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 screenWidth = document.body.clientWidth // body当前宽度
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const screenHeight = document.documentElement.clientHeight // 可见区域高度(应为body高度，可某些环境下无法获取)
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const dragDomWidth = dragDom.offsetWidth // 移动内容宽度 - 必须设置
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const dragDomheight = dragDom.offsetHeight // 移动内容高度 - 必须设置
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const minDragDomLeft = dragDom.offsetLeft // 离左侧最小距离
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const maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth // 离左侧最大距离
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const minDragDomTop = dragDom.offsetTop // 离顶部最小距离
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const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomheight // 离顶部最大距离
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// 获取到的值带px 正则匹配替换
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let styL = sty(dragDom, 'left')
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// 为兼容ie
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if (styL === 'auto') styL = '0px'
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let styT = sty(dragDom, 'top')
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// console.log(styL)
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// 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
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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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}
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document.onmouseup = function (e: any) {
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document.onmousemove = null
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document.onmouseup = null
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}
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return false
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}
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}
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}
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// 挂载，注册
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const directives = {
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install: function (app: any) {
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app.directive('dialogDrag', drag)
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}
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};
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export default directives;
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