弹窗拖拽边界控制

import {Directive,App} from "vue";
const getPxVal =(str: string) => {
    if(str && str.endsWith('px')) {
        return parseInt(str.substring(0,str.length-2))
    } else {
        return 0
    }
}
interface DragBind {
    mousemove: (e :MouseEvent) => void
    mousedown: (e :MouseEvent) => void
    mouseup: (e :MouseEvent) => void
}
const myDirective: Directive = {
    mounted(el: HTMLElement, binding, vnode, prevVnode) {
        console.log(binding)
        const title = el.children[0] as HTMLElement
        if (!title){
            return
        }

        let dragging: false;
        let dragPoint: {x:number,y:number,left:number,top: number}

        const dragBind = binding as unknown as DragBind
        dragBind.mousemove = (e: MouseEvent) => {
            const x = e.clientX - dragPoint.x
            const y = e.clientY - dragPoint.y
            debugger
            if(dragPoint.left+x<=0){
                el.style.left = '0px'
            }else{
                if(dragPoint.left+x+el.clientWidth >= document.documentElement.clientWidth){
                    el.style.left = (document.documentElement.clientWidth - el.clientWidth) +'px'
                }else{
                    el.style.left = (dragPoint.left + x) +'px'
                }
            }

            if(dragPoint.top+y<=0){
                el.style.top = '0px'
            }else{
                if(dragPoint.top+y+el.clientHeight >= document.documentElement.clientHeight){
                    el.style.top = (document.documentElement.clientHeight - el.clientHeight) +'px'
                }else{
                    el.style.top = (dragPoint.top + y) +'px'
                }

            }
        }
        dragBind.mousedown = (e: MouseEvent)=>{
            if (!dragging) {
                window.addEventListener('mousemove',dragBind.mousemove)
            }
            dragPoint = {
                x: e.clientX,y: e.clientY,left:getPxVal(el.style.left),top: getPxVal(el.style.top),
            }
        }
        dragBind.mouseup = (e: MouseEvent) => {
            console.log('mouseup')
            window.removeEventListener('mousemove',dragBind.mousemove)
            dragging = false
        }

        el.addEventListener('mousedown',dragBind.mousedown)
        el.addEventListener('mouseup',dragBind.mouseup)
    },
    unmounted(el: HTMLElement, binding) {
        const dragBind = binding as unknown as DragBind
        window.removeEventListener('mousemove',dragBind.mousemove)
        console.log('卸载')
    }
}

const applyApp = (app: App)=> {
    app.directive('dialog-x',myDirective)
}

export {
    applyApp
}

使用如下

import { createApp } from 'vue'

import { createPinia } from 'pinia'
import ElementPlus from 'element-plus'
// import 'element-plus/dist/index.css'
// import 'element-plus/theme-chalk/dark/css-vars.css'//这句是暗黑模式切换
import './el-custom.scss'

import router from './router/index2.ts'
import {applyApp} from "@/components/main/dialog/directive.ts";

import './style.css'
import App from './Main.vue'


const app = createApp(App)
applyApp(app)
const pinia = createPinia()
app.use(pinia)
app.use(ElementPlus)
app.use(router)
app.mount('#app')