全国服务热线:4008-888-888

技术知识

上海抖音微信小程序_vue完成div可拖动方位也可改

vue实现div可拖动位置也可改变盒子大小的原理       这篇文章主要介绍了vue实现div可拖动位置也可改变盒子大小,本文给大家介绍的非常详细,对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下

以下是效果图:实现了div盒子在固定区域的拖动,也可改变盒子的高度和宽度,当超出边距后无法继续改变大小

这里说一下大致原理:拖动和改变大小是分开来操作的,接下来分别说一下

盒子拖动

这里用到了js的三个鼠标事件,分别是onmousedown(鼠标按下)、onmousemove(鼠标移动)以及onmouseup(鼠标松开),大致流程就是鼠标按下拖动图标进行拖动时,动态获取当前div的left和top再重新赋值给当前div的top、left值,当鼠标松开再清除事件,至于固定在某个区域内拖动,在赋值的时候判断当前top及left值是否超过限制区域的值,如果超过给最大值最小值

盒子改变大小

这里用到的也是盒子拖动的三个事件,当鼠标移入盒子左边框触发mousemove事件,动态计算盒子宽度重新赋值,鼠标松开注销mousrmove事件,我将宽度和高度改变分别封装了组件,用的时候直接调用就好

博主用的vue写的,这里展示的也是铜鼓vue书写的,其他都是大同小异,知道原理就好

// index.vue
 template 
 !-- demo -- 
 div id="maxBoxId" 
 :id="moveInfo.dragId"
 :style="
 'width:' +
 moveInfo.width +
 'px; left:' +
 moveInfo.coordinate.x +
 'px; top:' +
 moveInfo.coordinate.y +
 'px; height:' +
 moveInfo.height +
 'px'
 div 
 div 
 !-- 拖拽图标 -- 
 div 
 @mousedown.stop="dragDiv($event)"
 @mouseup.stop="dragUp($event)"
 /div 
 {{ moveInfo.text }}
 /div 
 !-- 宽度改变组件 -- 
 ChangeWidth :moveId="moveInfo.moveId" index="0" @widthChange="changeWidth" @clearEvent="clearEvent" / 
 !-- 高度改变组件 -- 
 ChangeHeight :moveId="moveInfo.moveId" index="1" @heightChange="heightChange" @clearEvent="clearEvent" / 
 /div 
 /div 
 /div 
 /template 
 script 
import ChangeWidth from '../component/ChangeWidth'
import ChangeHeight from '../component/ChangeHeight'
export default {
 components: { ChangeWidth, ChangeHeight },
 name: 'demo',
 data() {
 return {
 moveInfo: {
 dragId: 'smallDragBoxId',
 moveId: 'smallMoveBoxId',
 text: '我是拖动的小盒子',
 width: 400,
 height: 100,
 // 上边距和左边距
 coordinate: {
 x: 180,
 y: 10
 methods: {
 // 区块拖动
 dragDiv(el, index) {
 // dragId: 可拖动区域唯一标识
 // moveId: 改变宽度组件唯一标识
 const { dragId, coordinate } = this.moveInfo
 let obig = document.getElementById('maxBoxId')
 let osmall = document.getElementById(dragId)
 // 用于保存小的div拖拽前的坐标
 osmall.startX = el.clientX - osmall.offsetLeft
 osmall.startY = el.clientY - osmall.offsetTop
 document.onmousemove = e = {
 let left, top
 left = e.clientX - osmall.startX
 top = e.clientY - osmall.startY
 osmall.style.left = left + 'px'
 osmall.style.top = top + 'px'
 coordinate.x = left
 coordinate.y = top
 if (left = 0) {
 osmall.style.left = 0 + 'px'
 coordinate.x = 0
 if (top = 0) {
 osmall.style.top = 0 + 'px'
 coordinate.y = 0
 if (left = obig.offsetWidth - osmall.offsetWidth) {
 osmall.style.left = obig.offsetWidth - osmall.offsetWidth + 'px'
 coordinate.x = obig.offsetWidth - osmall.offsetWidth
 if (top = obig.offsetHeight - osmall.offsetHeight) {
 osmall.style.top = obig.offsetHeight - osmall.offsetHeight + 'px'
 coordinate.y = obig.offsetHeight - osmall.offsetHeight
 dragUp(el) {
 document.onmousemove = null
 document.onmouseup = null
 // 调用接口保存数据
 // 改变drag宽度尺寸
 changeWidth(params) {
 const { index, width } = params
 let left
 const { dragId } = this.moveInfo
 // let obig = document.getElementById('maxBoxId')
 let osmall = document.getElementById(dragId)
 let boxWidth = document.getElementById('maxBoxId').offsetWidth
 left = osmall.style.left
 const newWidth = this.moveInfo.width + width
 // outWidth拖动宽度时超出box的宽度
 const outWidth = Number(left.slice(0, left.length - 2)) + Number(newWidth) - Number(boxWidth)
 // 如果超出box将截取留下的
 if (outWidth = 0) {
 this.moveInfo.width = Number(boxWidth) - Number(left.slice(0, left.length - 2))
 } else {
 this.moveInfo.width = newWidth
 // 设置div的最小宽度和最大宽度
 if (this.moveInfo.width 200) {
 this.moveInfo.width = 200
 if (this.moveInfo.width 900) {
 this.moveInfo.width = 900
 // 改变drag高度
 heightChange(params) {
 const { index, height } = params
 let top
 let osmall = document.getElementById(this.moveInfo.dragId)
 let boxHeight = document.getElementById('maxBoxId').offsetHeight
 top = osmall.style.top
 const newHeight = this.moveInfo.height + height
 // outHeight拖动宽度时超出box的高度
 const outHeight = Number(top.slice(0, top.length - 2)) + Number(newHeight) - Number(boxHeight)
 // 如果超出box将截取留下的
 if (outHeight = 0) {
 this.moveInfo.height = Number(boxHeight) - Number(top.slice(0, top.length - 2))
 } else {
 this.moveInfo.height = newHeight
 // 设置div的最小宽度和最大宽度
 if (this.moveInfo.height 100) {
 this.moveInfo.height = 100
 if (this.moveInfo.height 200) {
 this.moveInfo.height = 200
 // 清除鼠标事件
 clearEvent() {
 document.onmousemove = null
 document.onmouseup = null
 /script 
 style lang="scss" scoped 
.demo {
 position: relative;
 width: 100%;
 z-index: 10;
 width: 1200px;
 background: red;
 height: 300px;
 margin-bottom: 1000px;
 margin-left: 100px;
 .drag-class {
 background: rgba(255, 255, 255, 0);
 position: absolute;
 .drag-content {
 position: relative;
 height: 100%;
 .content-text {
 border: 1px dashed #ffffff;
 font-size: 34px;
 color: #ffffff;
 margin-top: 5px;
 position: relative;
 height: 100%;
 .drag-icon {
 position: absolute;
 right: 10px;
 top: 5px;
 float: left;
 // margin-right: 10px;
 .down-dragger {
 cursor: move;
 font-size: 30px;
 color: #dbdce0;
 color: #ffffff;
 /style 

以下是改变大小的组件

 template 
 !-- 拖动右边距改变div宽度 -- 
 div :id="`width${moveId}`" @mousedown="mouseDown" /div 
 /template 
 script 
export default {
 name: 'ChangeWidth',
 pro凡科抠图: ['index', 'moveId'],
 data() {
 return {
 lastX: ''
 created() {
 document.addEventListener('mouseup', this.mouseUp)
 destroyed() {
 document.removeEventListener('mouseup', this.mouseUp)
 methods: {
 mouseDown(event) {
 document.addEventListener('mousemove', this.mouseMove)
 this.lastX = event.screenX
 mouseMove(e) {
 this.$emit('widthChange', { width: e.screenX - this.lastX, index: this.index })
 this.lastX = e.screenX
 mouseUp() {
 this.lastX = ''
 document.removeEventListener('mousemove', this.mouseMove)
 this.$emit('clearEvent')
 /script 
 style lang="less" scoped 
.x-handle {
 width: 5px;
 cursor: e-resize;
 background: #2866f0;
 height: 30px;
 position: absolute;
 right: 0;
 top: 40%;
 /style 

改变高度的组件原理和宽度一样,避免代码重复就不上传了

上面就是大致流程和源码。

总结

到此这篇关于vue实现div可拖动位置也可改变盒子大小的文章就介绍到这了,更多相关vue 实现div拖动位置内容请搜索凡科以前的文章或继续浏览下面的



在线客服

关闭

客户服务热线
4008-888-888


点击这里给我发消息 在线客服

点击这里给我发消息 在线客服