使dialog可拖拽指令

在项目开发过程中,需要支持dialog弹窗可拖拽,则需要对dialog添加指令。具体操作说明如下:

(1)在用于存放指令的文件夹内,新建拖拽指令文件夹,例如命名为:el-dragDialog,如下所示:

 使dialog可拖拽指令

  el-dragDialog/index.js文件代码,如下示: 

 1 import drag from './drag'
 2 
 3 const install = function(Vue) {
 4   Vue.directive('el-drag-dialog', drag)
 5 }
 6 
 7 if (window.Vue) {
 8   window['el-drag-dialog'] = drag
 9   Vue.use(install); // eslint-disable-line
10 }
11 
12 drag.install = install
13 export default drag

  el-dragDialog/drag.js文件代码,如下示

 1 export default{
 2   bind(el, binding, vnode) {
 3     const dialogHeaderEl = el.querySelector('.el-dialog__header')
 4     const dragDom = el.querySelector('.el-dialog')
 5     dialogHeaderEl.style.cssText += ';cursor:move;'
 6     dragDom.style.cssText += ';top:0px;'
 7 
 8     // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
 9     const getStyle = (function() {
10       if (window.document.currentStyle) {
11         return (dom, attr) => dom.currentStyle[attr]
12       } else {
13         return (dom, attr) => getComputedStyle(dom, false)[attr]
14       }
15     })()
16 
17     dialogHeaderEl.onmousedown = (e) => {
18       // 鼠标按下,计算当前元素距离可视区的距离
19       const disX = e.clientX - dialogHeaderEl.offsetLeft
20       const disY = e.clientY - dialogHeaderEl.offsetTop
21 
22       const dragDomWidth = dragDom.offsetWidth
23       const dragDomheight = dragDom.offsetHeight
24 
25       const screenWidth = document.body.clientWidth
26       const screenHeight = document.body.clientHeight
27 
28       const minDragDomLeft = dragDom.offsetLeft
29       const maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth
30 
31       const minDragDomTop = dragDom.offsetTop
32       const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomheight
33 
34       // 获取到的值带px 正则匹配替换
35       let styL = getStyle(dragDom, 'left')
36       let styT = getStyle(dragDom, 'top')
37 
38       if (styL.includes('%')) {
39         styL = +document.body.clientWidth * (+styL.replace(/\%/g, '') / 100)
40         styT = +document.body.clientHeight * (+styT.replace(/\%/g, '') / 100)
41       } else {
42         styL = +styL.replace(/\px/g, '')
43         styT = +styT.replace(/\px/g, '')
44       }
45 
46       document.onmousemove = function(e) {
47         // 通过事件委托,计算移动的距离
48         let left = e.clientX - disX
49         let top = e.clientY - disY
50 
51         // 边界处理
52         if (-(left) > minDragDomLeft) {
53           left = -minDragDomLeft
54         } else if (left > maxDragDomLeft) {
55           left = maxDragDomLeft
56         }
57 
58         if (-(top) > minDragDomTop) {
59           top = -minDragDomTop
60         } else if (top > maxDragDomTop) {
61           top = maxDragDomTop
62         }
63 
64         // 移动当前元素
65         dragDom.style.cssText += `;left:${left + styL}px;top:${top + styT}px;`
66 
67         // emit onDrag event
68         vnode.child.$emit('dragDialog')
69       }
70 
71       document.onmouseup = function(e) {
72         document.onmousemove = null
73         document.onmouseup = null
74       }
75     }
76   }
77 }

(2)在main.js中引入该指令:

 // 拖拽弹
import elDragDialog from './directive/el-dragDialog/index';窗
Vue.use(elDragDialog);

 

 (3)在需要支持拖拽的的dialog中,加入指令:v-el-drag-dialog 

使dialog可拖拽指令

 

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