| | |
| | | import Vue from 'vue' |
| | | |
| | | // 自定义元素实现弹框拖拽[重点] |
| | | Vue.directive('draw', { |
| | | // inserted: function (el, binding, vNode) { |
| | | // el.setAttribute('style', 'position: fixed; z-index: 9999') |
| | | // }, |
| | | bind: function (el, bindding, vNode) { |
| | | el.setAttribute('draggable', true) |
| | | let left, top, width, height |
| | | el._dragstart = function (event) { |
| | | event.stopPropagation() |
| | | left = event.clientX - el.offsetLeft |
| | | top = event.clientY - el.offsetTop |
| | | width = el.offsetWidth |
| | | height = el.offsetHeight |
| | | } |
| | | el._checkPosition = function () { // 防止被拖出边界 |
| | | const width = el.offsetWidth |
| | | const height = el.offsetHeight |
| | | let left = Math.min(el.offsetLeft, document.body.clientWidth - width) |
| | | left = Math.max(0, left) |
| | | let top = Math.min(el.offsetTop, document.body.clientHeight - height) |
| | | top = Math.max(0, top) |
| | | el.style.left = left + 'px' |
| | | el.style.top = top + 'px' |
| | | el.style.width = width + 'px' |
| | | el.style.height = height + 'px' |
| | | } |
| | | el._dragEnd = function (event) { |
| | | event.stopPropagation() |
| | | left = event.clientX - left |
| | | top = event.clientY - top |
| | | el.style.left = left + 'px' |
| | | el.style.top = top + 'px' |
| | | el.style.width = width + 'px' |
| | | el.style.height = height + 'px' |
| | | el._checkPosition() |
| | | } |
| | | el._documentAllowDraop = function (event) { |
| | | event.preventDefault() |
| | | } |
| | | document.body.addEventListener('dragover', el._documentAllowDraop) |
| | | el.addEventListener('dragstart', el._dragstart) |
| | | el.addEventListener('dragend', el._dragEnd) |
| | | window.addEventListener('resize', el._checkPosition) |
| | | // 使用Vue.directive()定义一个全局指令 |
| | | // 1.参数一:指令的名称,定义时指令前面不需要写v- |
| | | // 2.参数二:是一个对象,该对象中有相关的操作函数 |
| | | // 3.在调用的时候必须写v- |
| | | const drag = Vue.directive('drag', { |
| | | // 1.指令绑定到元素上回立刻执行bind函数,只执行一次 |
| | | // 2.每个函数中第一个参数永远是el,表示绑定指令的元素,el参数是原生js对象 |
| | | // 3.通过el.focus()是无法获取焦点的,因为只有插入DOM后才生效 |
| | | bind: function (el) { |
| | | el.style.cursor = 'move' // 鼠标样式变move样式 |
| | | }, |
| | | // inserted表示一个元素,插入到DOM中会执行inserted函数,只触发一次 |
| | | inserted: function (el) { |
| | | el.onmousedown = function (e) { |
| | | var distX = e.pageX - el.offsetLeft |
| | | var distY = e.pageY - el.offsetTop |
| | | console.log('元素本身的高:' + el.clientHeight + ',元素本身的宽:' + el.clientWidth) |
| | | |
| | | unbind: function (el, bindding, vNode) { |
| | | document.body.removeEventListener('dragover', el._documentAllowDraop) |
| | | el.removeEventListener('dragstart', el._dragstart) |
| | | el.removeEventListener('dragend', el._dragEnd) |
| | | window.removeEventListener('resize', el._checkPosition) |
| | | delete el._documentAllowDraop |
| | | delete el._dragstart |
| | | delete el._dragEnd |
| | | delete el._checkPosition |
| | | if (e.preventDefault) { |
| | | e.preventDefault() |
| | | } else { |
| | | e.returnValue = false |
| | | } |
| | | // 解决快速拖动滞后问题 |
| | | |
| | | document.onmousemove = function (e) { |
| | | // 用鼠标的位置减去鼠标相对元素的位置,得到元素的位置 |
| | | let left = e.clientX - distX |
| | | let top = e.clientY - distY |
| | | |
| | | if (left <= 0) { |
| | | left = 5 // 设置成5是为了不离边缘太近 |
| | | } else if (left > document.documentElement.clientWidth - el.clientWidth) { |
| | | // document.documentElement.clientWidth 屏幕的可视宽度 |
| | | left = document.documentElement.clientWidth - el.clientWidth - 5 |
| | | } |
| | | if (top <= 0) { |
| | | top = 5 |
| | | } else if (top > document.documentElement.clientHeight - el.clientHeight) { |
| | | top = document.documentElement.clientHeight - el.clientHeight - 5 |
| | | } |
| | | el.style.left = left + 'px' |
| | | el.style.top = top + 'px' |
| | | } |
| | | document.onmouseup = function () { |
| | | document.onmousemove = document.onmouseup = null |
| | | } |
| | | } |
| | | }, |
| | | // 当VNode更新的时候会执行updated,可以触发多次 |
| | | updated: function (el) { |
| | | } |
| | | }) |
| | | export default drag |