vue中通过自定义指令实现一个可拖拽，缩放的弹窗

效果

功能描述

• 按住头部可拖拽
• 鼠标放到边框，可缩放
• 多层重叠
• 丰富的插槽，易于扩展

示例

指令代码

export const dragDialog = {inserted: function (el, { value, minWidth = 400, minHeight = 200 }) {// 让弹窗居中let dialogHeight = el.clientHeight ?? 0let dialogWidth = el.clientWidth ?? 0// 获取可视区域的宽高let windowWidth = document.documentElement.clientWidth ?? 0let windowHeight = document.documentElement.clientHeight ?? 0// 弹窗的可移动范围let leftMax = windowWidth - dialogWidthlet topMax = windowHeight - dialogHeight//还需要判断是否传入了top,left值let { top, center } = valuelet left = (windowWidth - dialogWidth) / 2if (!center) {// 没有设置centerif (top.includes('%') || top.includes('px')) {el.style.top = top} else {el.style.top = top + 'px'}el.style.left = left + 'px'} else {el.style.top = (windowHeight - dialogHeight) / 2 + 'px'el.style.left = (windowWidth - dialogWidth) / 2 + 'px'}const el_header = el.querySelector('.kl-dailog-header')// 只有点击头部才能拖拽if (!el_header) returnlet headerHeight = el_header.clientHeight - 0// 缩放相关el.onmousemove = function (e) {if(!e) return// 判断当前鼠标是否处于可以拖拽的边缘，不包含头部if (e.clientX > el.offsetLeft + el.clientWidth - 10 || el.offsetLeft + 10 > e.clientX) {el.style.cursor = 'w-resize'} else if (el.scrollTop + e.clientY >el.offsetTop + el.clientHeight - 10 - headerHeight) {el.style.cursor = 's-resize'} else {el.style.cursor = 'default'}el.onmousedown = (e) => {if(!e) return// 获取头部的宽高以及到可视区域的距离const el_header_rect = el_header.getBoundingClientRect()if (!el_header_rect) returnlet offsetTopHeader = el_header_rect.top - 0// 判断当前元素是否是可拖拽的头部元素if (headerHeight > e.pageY - offsetTopHeader) {// 是头部，拖拽相关// 获取到鼠标与被拖拽节点的相对位置let disx = e.pageX - el.offsetLeftlet disy = e.pageY - el.offsetTop// 获取弹窗的宽高let width = el.clientWidth ?? 0let height = el.clientHeight ?? 0// 设置其他弹窗的z-index 100let maxZIndex = 100document.querySelectorAll('.kl-dialog-container').forEach((item) => {let zIndex = item.style.zIndexzIndex = zIndex ? zIndex - 0 : 100if (zIndex > maxZIndex) {maxZIndex = zIndex}})el.style.zIndex = maxZIndex + 1document.onmousemove = function (e) {const el_rect = el.getBoundingClientRect()if (!el_rect) return// 获取弹窗到可视区域的距离let offsetTopEl = el_rect.top - 0let offsetLeftEl = el_rect.left - 0let left = e.pageX - disxlet top = e.pageY - disy// 对弹窗的位置进行限制if (offsetTopEl < 0 || top < 0) {top = 0}if (offsetLeftEl < 0 || left < 0) {left = 0}if (offsetTopEl + height > windowHeight || top > topMax) {top = windowHeight - height}if (offsetLeftEl + width > windowWidth || left > leftMax) {left = windowWidth - width}// 重新设置被拖拽节点的位置el.style.left = left + 'px'el.style.top = top + 'px'}document.onmouseup = function () {document.onmousemove = document.onmouseup = null}} else {const clientX = e.clientX // 鼠标点击时的X坐标const clientY = e.clientY // 鼠标点击时的Y坐标let elW = el.clientWidth // 当前元素的宽度let elH = el.clientHeight // 当前元素的高度let EloffsetLeft = el.offsetLeft // 元素距离左边的距离let EloffsetTop = el.offsetTop // 元素距离顶部的距离el.style.userSelect = 'none'let ELscrollTop = el.scrollTop // 元素滚动条距离顶部的距离// 不是头部，缩放相关document.onmousemove = function (e) {e.preventDefault() // 移动时禁用默认事件//左侧鼠标拖拽位置if (clientX > EloffsetLeft && clientX < EloffsetLeft + 10) {//往左拖拽if (clientX > e.clientX) {el.style.width = elW + (clientX - e.clientX) * 2 + 'px'el.style.left = EloffsetLeft - (clientX - e.clientX) + 'px'}//往右拖拽if (clientX < e.clientX) {if (el.clientWidth < minWidth) {} else {el.style.width = elW - (e.clientX - clientX) * 2 + 'px'el.style.left = EloffsetLeft + (e.clientX - clientX) + 'px'}}}//右侧鼠标拖拽位置if (clientX > EloffsetLeft + elW - 10 && clientX < EloffsetLeft + elW) {//往左拖拽if (clientX > e.clientX) {if (el.clientWidth < minWidth) {} else {el.style.width = elW - (clientX - e.clientX) * 2 + 'px'el.style.left = EloffsetLeft + (clientX - e.clientX) + 'px'}}//往右拖拽if (clientX < e.clientX) {el.style.width = elW + (e.clientX - clientX) * 2 + 'px'el.style.left = EloffsetLeft + (clientX - e.clientX) + 'px'}}//底部鼠标拖拽位置if (ELscrollTop + clientY > EloffsetTop + elH - 20 &&ELscrollTop + clientY < EloffsetTop + elH) {//往上拖拽if (clientY > e.clientY) {if (el.clientHeight < minHeight) {} else {el.style.height = elH - (clientY - e.clientY) * 2 + 'px'el.style.top = EloffsetTop + (clientY - e.clientY) + 'px'}}//往下拖拽if (clientY < e.clientY) {el.style.height = elH + (e.clientY - clientY) * 2 + 'px'el.style.top = EloffsetTop + (clientY - e.clientY) + 'px'}}}//拉伸结束document.onmouseup = function (e) {document.onmousemove = nulldocument.onmouseup = null}}}}},// 指令销毁unbind(el) {},
}

vue组件代码

<template><!-- 添加弹窗的动画 --><!-- <transition name="kl-dialog"> --><div class="kl-dialog" v-if="dialogVisible"><!-- 遮罩 --><div class="kl-mask" :id="klMaskId" v-if="modal" @click="close"></div><!-- 弹窗 --><!-- 这儿需要mousedown来控制顺序 --><div:id="klDialogId":class="['kl-dialog-container','resize-container',nobg ? 'kl-dialog-container-bg-no' : '',]"v-dragDialog="{ top: top, center: center }":style="{ width: width, top: top }"@mousedown="setZIndex"><!-- 弹窗头部 --><slot name="header"><!-- 必须要有这个kl-dailog-header类才能拖拽 --><div class="kl-dailog-header cc"><div class="kl-dailog-header-title">{{ title }}</div><div class="kl-dailog-header-close" @click="close"><i class="el-icon-close kl-dailog-header-close-icon"></i></div></div></slot><!-- 弹窗中间内容 --><slot> default </slot><!-- 弹窗底部 --><slot name="footer"><div class="kl-dailog-footer"><el-button @click="close">取消</el-button><el-button type="primary" @click="determine">确定</el-button></div></slot></div></div><!-- </transition> -->
</template><script>
export default {name: 'klDialog',props: {// 去除主题背景色nobg: {type: Boolean,default: false,},// 控制显示隐藏dialogVisible: {type: Boolean,default: false,},// 是否显示遮罩modal: {type: Boolean,default: true,},// 头部标题title: {type: String,default: '',},// 弹窗宽width: {type: String,default: '30%',},// 距离顶部的距离top: {type: String,default: '20%',},center: {type: Boolean,default: false,},},data() {return {klMaskId: '',klDialogId: '',}},created() {this.init()},beforeDestroy() {// console.log('beforeDestroy');},watch: {dialogVisible(val) {if (val) {this.setZIndex()}},},methods: {// 确定determine() {this.$emit('determine')},// 关闭弹窗close() {this.$emit('close')},// 给每个弹窗添加一个idinitId() {this.klMaskId = this.createId()this.klDialogId = this.createId()},// 将当前弹窗的z-index设置为最高async setZIndex() {let { klDialogId } = thisawait this.$nextTick()let els = document.querySelectorAll('.kl-dialog-container')let maxZIndex = 100els.forEach((item) => {let zIndex = item.style.zIndexzIndex = zIndex ? zIndex - 0 : 100if (zIndex > maxZIndex) {maxZIndex = zIndex}})let el = document.querySelector('#' + klDialogId)if (el) {el.style.zIndex = maxZIndex + 1}},// 初始化init() {this.initId()// 设置当前的弹窗层级最高this.setZIndex()},},
}
</script><style lang="scss" scoped>
.kl-mask {position: fixed;top: 0;left: 0;width: 100vw;height: 100vw;background-color: rgba(0, 0, 0, 0.5);z-index: 100;
}
.kl-dialog-container {position: fixed;border-radius: 2px;box-shadow: 0 1px 3px rgb(0 0 0 / 30%);box-sizing: border-box;background-color: #fff;z-index: 100;
}
.kl-dialog-container-bg-no {box-shadow: none;background: none;
}
.kl-dialog-container-center {left: 50% !important;top: 50% !important;transform: translate(-50%, -50%) !important;
}.kl-dailog-header {padding: 0 20px;height: 54px;line-height: 54px;position: relative;font-size: 18px;font-weight: 500;user-select: none;
}
.kl-dailog-header-close {position: absolute;top: 50%;right: 20px;transform: translateY(-50%);cursor: pointer;
}
.kl-dailog-header-close-icon {color: #aaa;
}
.kl-dailog-footer {padding: 0 20px;height: 70px;line-height: 70px;text-align: right;
}.cc {cursor: move;
}// 弹窗动画
.kl-dialog-enter-active,
.kl-dialog-leave-active {transition: all 0.3s;
}.kl-dialog-enter,
.kl-dialog-leave-to {opacity: 0;transform: translate(300px,300px);
}
</style>