Dialog에서 Portal 적용

• shadcn/ui의 dialog (= Radix 기반)

  "use client"
  
  import * as React from "react"
  import * as DialogPrimitive from "@radix-ui/react-dialog"
  import { XIcon } from "lucide-react"
  
  import { cn } from "@/lib/utils"
  
  function Dialog({
    ...props
  }: React.ComponentProps<typeof DialogPrimitive.Root>) {
    return <DialogPrimitive.Root data-slot="dialog" {...props} />
  }
  
  function DialogTrigger({
    ...props
  }: React.ComponentProps<typeof DialogPrimitive.Trigger>) {
    return <DialogPrimitive.Trigger data-slot="dialog-trigger" {...props} />
  }
  
  function DialogPortal({
    ...props
  }: React.ComponentProps<typeof DialogPrimitive.Portal>) {
    return <DialogPrimitive.Portal data-slot="dialog-portal" {...props} />
  }
  
  function DialogClose({
    ...props
  }: React.ComponentProps<typeof DialogPrimitive.Close>) {
    return <DialogPrimitive.Close data-slot="dialog-close" {...props} />
  }
  
  function DialogOverlay({
    className,
    ...props
  }: React.ComponentProps<typeof DialogPrimitive.Overlay>) {
    return (
      <DialogPrimitive.Overlay
        data-slot="dialog-overlay"
        className={cn(
          "data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 fixed inset-0 z-50 bg-black/50",
          className
        )}
        {...props}
      />
    )
  }
  
  function DialogContent({
    className,
    children,
    showCloseButton = true,
    ...props
  }: React.ComponentProps<typeof DialogPrimitive.Content> & {
    showCloseButton?: boolean
  }) {
    return (
      <DialogPortal data-slot="dialog-portal">
        <DialogOverlay />
        <DialogPrimitive.Content
          data-slot="dialog-content"
          className={cn(
            "bg-background data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 fixed top-[50%] left-[50%] z-50 grid w-full max-w-[calc(100%-2rem)] translate-x-[-50%] translate-y-[-50%] gap-4 rounded-lg border p-6 shadow-lg duration-200 sm:max-w-lg",
            className
          )}
          {...props}
        >
          {children}
          {showCloseButton && (
            <DialogPrimitive.Close
              data-slot="dialog-close"
              className="ring-offset-background focus:ring-ring data-[state=open]:bg-accent data-[state=open]:text-muted-foreground absolute top-4 right-4 rounded-xs opacity-70 transition-opacity hover:opacity-100 focus:ring-2 focus:ring-offset-2 focus:outline-hidden disabled:pointer-events-none [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4"
            >
              <XIcon />
              <span className="sr-only">Close</span>
            </DialogPrimitive.Close>
          )}
        </DialogPrimitive.Content>
      </DialogPortal>
    )
  }
  
  function DialogHeader({ className, ...props }: React.ComponentProps<"div">) {
    return (
      <div
        data-slot="dialog-header"
        className={cn("flex flex-col gap-2 text-center sm:text-left", className)}
        {...props}
      />
    )
  }
  
  function DialogFooter({ className, ...props }: React.ComponentProps<"div">) {
    return (
      <div
        data-slot="dialog-footer"
        className={cn(
          "flex flex-col-reverse gap-2 sm:flex-row sm:justify-end",
          className
        )}
        {...props}
      />
    )
  }
  
  function DialogTitle({
    className,
    ...props
  }: React.ComponentProps<typeof DialogPrimitive.Title>) {
    return (
      <DialogPrimitive.Title
        data-slot="dialog-title"
        className={cn("text-lg leading-none font-semibold", className)}
        {...props}
      />
    )
  }
  
  function DialogDescription({
    className,
    ...props
  }: React.ComponentProps<typeof DialogPrimitive.Description>) {
    return (
      <DialogPrimitive.Description
        data-slot="dialog-description"
        className={cn("text-muted-foreground text-sm", className)}
        {...props}
      />
    )
  }
  
  export {
    Dialog,
    DialogClose,
    DialogContent,
    DialogDescription,
    DialogFooter,
    DialogHeader,
    DialogOverlay,
    DialogPortal,
    DialogTitle,
    DialogTrigger,
  }
  

function DialogContent({
  className,
  children,
  showCloseButton = true,
  ...props
}: React.ComponentProps<typeof DialogPrimitive.Content> & {
  showCloseButton?: boolean
}) {
  return (
    <DialogPortal data-slot="dialog-portal">
      <DialogOverlay />
      <DialogPrimitive.Content
        .....

• DialogContent 안에서 DialogPortal을 자동으로 사용하고 있음 ⇒ shadcn/ui의 디자인 패턴
  

Portal의 장점들

1. DOM 계층 구조 탈출: 다이얼로그가 현재 컴포넌트의 DOM 위치와 관계없이 document.body에 렌더링됨
2. z-index 문제 해결: 부모 요소의 overflow: hidden이나 z-index 제약을 받지 않음
3. 접근성 향상: 스크린 리더가 다이얼로그를 올바르게 인식하고 포커스 관리가 개선됨
4. CSS 스타일링 독립성: 부모 컴포넌트의 CSS 스타일에 영향받지 않음