import Vue from 'vue'
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// 自定义元素实现弹框拖拽[重点]
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Vue.directive('draw', {
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inserted: function (el, binding, vNode) {
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el.setAttribute('style', 'position: fixed; z-index: 9999')
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},
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bind: function (el, bindding, vNode) {
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el.setAttribute('draggable', true)
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let left, top, width, height
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el._dragstart = function (event) {
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event.stopPropagation()
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left = event.clientX - el.offsetLeft
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top = event.clientY - el.offsetTop
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width = el.offsetWidth
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height = el.offsetHeight
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}
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el._checkPosition = function () { // 防止被拖出边界
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const width = el.offsetWidth
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const height = el.offsetHeight
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let left = Math.min(el.offsetLeft, document.body.clientWidth - width)
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left = Math.max(0, left)
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let top = Math.min(el.offsetTop, document.body.clientHeight - height)
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top = Math.max(0, top)
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el.style.left = left + 'px'
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el.style.top = top + 'px'
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el.style.width = width + 'px'
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el.style.height = height + 'px'
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}
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el._dragEnd = function (event) {
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event.stopPropagation()
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left = event.clientX - left
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top = event.clientY - top
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el.style.left = left + 'px'
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el.style.top = top + 'px'
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el.style.width = width + 'px'
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el.style.height = height + 'px'
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el._checkPosition()
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}
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el._documentAllowDraop = function (event) {
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event.preventDefault()
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}
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document.body.addEventListener('dragover', el._documentAllowDraop)
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el.addEventListener('dragstart', el._dragstart)
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el.addEventListener('dragend', el._dragEnd)
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window.addEventListener('resize', el._checkPosition)
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},
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unbind: function (el, bindding, vNode) {
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document.body.removeEventListener('dragover', el._documentAllowDraop)
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el.removeEventListener('dragstart', el._dragstart)
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el.removeEventListener('dragend', el._dragEnd)
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window.removeEventListener('resize', el._checkPosition)
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delete el._documentAllowDraop
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delete el._dragstart
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delete el._dragEnd
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delete el._checkPosition
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}
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})
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// v-dialogDrag: 弹窗拖拽
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Vue.directive('dialogDrag', {
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bind (el, binding, vnode, oldVnode) {
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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.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 = dragDom.currentStyle || window.getComputedStyle(dragDom, null)
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dialogHeaderEl.onmousedown = (e) => {
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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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// 获取到的值带px 正则匹配替换
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let styL, styT
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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 (sty.left.includes('%')) {
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styL = +document.body.clientWidth * (+sty.left.replace(/%/g, '') / 100)
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styT = +document.body.clientHeight * (+sty.top.replace(/%/g, '') / 100)
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} else {
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styL = +sty.left.replace(/px/g, '')
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styT = +sty.top.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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const l = e.clientX - disX
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const t = e.clientY - disY
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// 移动当前元素
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dragDom.style.left = `${l + styL}px`
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dragDom.style.top = `${t + styT}px`
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// 将此时的位置传出去
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// binding.value({x:e.pageX,y:e.pageY})
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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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// v-dialogDragWidth: 弹窗宽度拖大 拖小
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Vue.directive('dialogDragWidth', {
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bind (el, binding, vnode, oldVnode) {
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const dragDom = binding.value.$el.querySelector('.el-dialog')
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el.onmousedown = (e) => {
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// 鼠标按下，计算当前元素距离可视区的距离
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const disX = e.clientX - el.offsetLeft
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document.onmousemove = function (e) {
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e.preventDefault() // 移动时禁用默认事件
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// 通过事件委托，计算移动的距离
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const l = e.clientX - disX
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dragDom.style.width = `${l}px`
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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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