[WIP] Add navigation menu component with viewport support

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Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

import * as React from "react";
import * as NavigationMenuPrimitive from "@radix-ui/react-navigation-menu";
import { cva } from "class-variance-authority";
import { ChevronDownIcon } from "lucide-react";

import { cn } from "@/lib/utils";

function NavigationMenu({
className,
children,
viewport = true,
...props
}: React.ComponentProps & {
viewport?: boolean;
}) {
return (
<NavigationMenuPrimitive.Root
data-slot="navigation-menu"
data-viewport={viewport}
className={cn(
"group/navigation-menu relative flex max-w-max flex-1 items-center justify-center",
className
)}
{...props}
>
{children}
{viewport && }
</NavigationMenuPrimitive.Root>
);
}

function NavigationMenuList({
className,
...props
}: React.ComponentProps) {
return (
<NavigationMenuPrimitive.List
data-slot="navigation-menu-list"
className={cn(
"group flex flex-1 list-none items-center justify-center gap-1",
className
)}
{...props}
/>
);
}

function NavigationMenuItem({
className,
...props
}: React.ComponentProps) {
return (
<NavigationMenuPrimitive.Item
data-slot="navigation-menu-item"
className={cn("relative", className)}
{...props}
/>
);
}

const navigationMenuTriggerStyle = cva(
"group inline-flex h-9 w-max items-center justify-center rounded-md bg-background px-4 py-2 text-sm font-medium hover:bg-accent hover:text-accent-foreground focus:bg-accent focus:text-accent-foreground disabled:pointer-events-none disabled:opacity-50 data-[state=open]:hover:bg-accent data-[state=open]:text-accent-foreground data-[state=open]:focus:bg-accent data-[state=open]:bg-accent/50 focus-visible:ring-ring/50 outline-none transition-[color,box-shadow] focus-visible:ring-[3px] focus-visible:outline-1"
);

function NavigationMenuTrigger({
className,
children,
...props
}: React.ComponentProps) {
return (
<NavigationMenuPrimitive.Trigger
data-slot="navigation-menu-trigger"
className={cn(navigationMenuTriggerStyle(), "group", className)}
{...props}
>
{children}{" "}

</NavigationMenuPrimitive.Trigger>
);
}

function NavigationMenuContent({
className,
...props
}: React.ComponentProps) {
return (
<NavigationMenuPrimitive.Content
data-slot="navigation-menu-content"
className={cn(
"data-[motion^=from-]:animate-in data-[motion^=to-]:animate-out data-[motion^=from-]:fade-in data-[motion^=to-]:fade-out data-[motion=from-end]:slide-in-from-right-52 data-[motion=from-start]:slide-in-from-left-52 data-[motion=to-end]:slide-out-to-right-52 data-[motion=to-start]:slide-out-to-left-52 top-0 left-0 w-full p-2 pr-2.5 md:absolute md:w-auto",
"group-data-[viewport=false]/navigation-menu:bg-popover group-data-[viewport=false]/navigation-menu:text-popover-foreground group-data-[viewport=false]/navigation-menu:data-[state=open]:animate-in group-data-[viewport=false]/navigation-menu:data-[state=closed]:animate-out group-data-[viewport=false]/navigation-menu:data-[state=closed]:zoom-out-95 group-data-[viewport=false]/navigation-menu:data-[state=open]:zoom-in-95 group-data-[viewport=false]/navigation-menu:data-[state=open]:fade-in-0 group-data-[viewport=false]/navigation-menu:data-[state=closed]:fade-out-0 group-data-[viewport=false]/navigation-menu:top-full group-data-[viewport=false]/navigation-menu:mt-1.5 group-data-[viewport=false]/navigation-menu:overflow-hidden group-data-[viewport=false]/navigation-menu:rounded-md group-data-[viewport=false]/navigation-menu:border group-data-[viewport=false]/navigation-menu:shadow group-data-[viewport=false]/navigation-menu:duration-200 **:data-[slot=navigation-menu-link]:focus:ring-0 **:data-[slot=navigation-menu-link]:focus:outline-none",
className
)}
{...props}
/>
);
}

function NavigationMenuViewport({
className,
...props
}: React.ComponentProps) {
return (
<div
className={cn(
"absolute top-full left-0 isolate z-50 flex justify-center"
)}
>
<NavigationMenuPrimitive.Viewport
data-slot="navigation-menu-viewport"
className={cn(
"origin-top-center bg-popover text-popover-foreground data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-90 relative mt-1.5 h-[var(--radix-navigation-menu-viewport-height)] w-full overflow-hidden rounded-md border shadow md:w-[var(--radix-navigation-menu-viewport-width)]",
className
)}
{...props}
/>

);
}

function NavigationMenuLink({
className,
...props
}: React.ComponentProps) {
return (
<NavigationMenuPrimitive.Link
data-slot="navigation-menu-link"
className={cn(
"data-[active=true]:focus:bg-accent data-[active=true]:hover:bg-accent data-[active=true]:bg-accent/50 data-[active=true]:text-accent-foreground hover:bg-accent hover:text-accent-foreground focus:bg-accent focus:text-accent-foreground focus-visible:ring-ring/50 [&_svg:not([class*='text-'])]:text-muted-foreground flex flex-col gap-1 rounded-sm p-2 text-sm transition-all outline-none focus-visible:ring-[3px] focus-visible:outline-1 [&_svg:not([class*='size-'])]:size-4",
className
)}
{...props}
/>
);
}

function NavigationMenuIndicator({
className,
...props
}: React.ComponentProps) {
return (
<NavigationMenuPrimitive.Indicator
data-slot="navigation-menu-indicator"
className={cn(
"data-[state=visible]:animate-in data-[state=hidden]:animate-out data-[state=hidden]:fade-out data-[state=visible]:fade-in top-full z-[1] flex h-1.5 items-end justify-center overflow-hidden",
className
)}
{...props}
>

</NavigationMenuPrimitive.Indicator>
);
}

export {
NavigationMenu,
NavigationMenuList,
NavigationMenuItem,
NavigationMenuContent,
NavigationMenuTrigger,
NavigationMenuLink,
NavigationMenuIndicator,
NavigationMenuViewport,
navigationMenuTriggerStyle,
};

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