Segmented Control

// AlignUI useTabObserver v0.0.0
 
import * as React from 'react';
 
interface TabObserverOptions {
  onActiveTabChange?: (index: number, element: HTMLElement) => void;
}
 
export function useTabObserver({ onActiveTabChange }: TabObserverOptions = {}) {
  const [mounted, setMounted] = React.useState(false);
  const listRef = React.useRef<HTMLDivElement>(null);
  const onActiveTabChangeRef = React.useRef(onActiveTabChange);
 
  React.useEffect(() => {
    onActiveTabChangeRef.current = onActiveTabChange;
  }, [onActiveTabChange]);
 
  const handleUpdate = React.useCallback(() => {
    if (listRef.current) {
      const tabs = listRef.current.querySelectorAll('[role="tab"]');
      tabs.forEach((el, i) => {
        if (el.getAttribute('data-state') === 'active') {
          onActiveTabChangeRef.current?.(i, el as HTMLElement);
        }
      });
    }
  }, []);
 
  React.useEffect(() => {
    setMounted(true);
 
    const resizeObserver = new ResizeObserver(handleUpdate);
    const mutationObserver = new MutationObserver(handleUpdate);
 
    if (listRef.current) {
      resizeObserver.observe(listRef.current);
      mutationObserver.observe(listRef.current, {
        childList: true,
        subtree: true,
        attributes: true,
      });
    }
 
    handleUpdate();
 
    return () => {
      resizeObserver.disconnect();
      mutationObserver.disconnect();
    };
  }, []);
 
  return { mounted, listRef };
}

// AlignUI SegmentedControl v0.0.0
 
'use client';
 
import * as React from 'react';
import { Slottable } from '@radix-ui/react-slot';
import * as TabsPrimitive from '@radix-ui/react-tabs';
import mergeRefs from 'merge-refs';
 
import { useTabObserver } from '@/hooks/use-tab-observer';
import { cn } from '@/utils/cn';
 
const SegmentedControlRoot = TabsPrimitive.Root;
SegmentedControlRoot.displayName = 'SegmentedControlRoot';
 
const SegmentedControlList = React.forwardRef<
  React.ComponentRef<typeof TabsPrimitive.List>,
  React.ComponentPropsWithoutRef<typeof TabsPrimitive.List> & {
    floatingBgClassName?: string;
  }
>(({ children, className, floatingBgClassName, ...rest }, forwardedRef) => {
  const [lineStyle, setLineStyle] = React.useState({ width: 0, left: 0 });
 
  const { mounted, listRef } = useTabObserver({
    onActiveTabChange: (_, activeTab) => {
      const { offsetWidth: width, offsetLeft: left } = activeTab;
      setLineStyle({ width, left });
    },
  });
 
  return (
    <TabsPrimitive.List
      ref={mergeRefs(forwardedRef, listRef)}
      className={cn(
        'relative isolate grid w-full auto-cols-fr grid-flow-col gap-1 rounded-10 bg-bg-weak-50 p-1',
        className,
      )}
      {...rest}
    >
      <Slottable>{children}</Slottable>
 
      {/* floating bg */}
      <div
        className={cn(
          'absolute inset-y-1 left-0 -z-10 rounded-md bg-bg-white-0 shadow-toggle-switch transition-transform duration-300',
          {
            hidden: !mounted,
          },
          floatingBgClassName,
        )}
        style={{
          transform: `translate3d(${lineStyle.left}px, 0, 0)`,
          width: `${lineStyle.width}px`,
          transitionTimingFunction: 'cubic-bezier(0.65, 0, 0.35, 1)',
        }}
        aria-hidden='true'
      />
    </TabsPrimitive.List>
  );
});
SegmentedControlList.displayName = 'SegmentedControlList';
 
const SegmentedControlTrigger = React.forwardRef<
  React.ComponentRef<typeof TabsPrimitive.Trigger>,
  React.ComponentPropsWithoutRef<typeof TabsPrimitive.Trigger>
>(({ className, ...rest }, forwardedRef) => {
  return (
    <TabsPrimitive.Trigger
      ref={forwardedRef}
      className={cn(
        // base
        'peer',
        'relative z-10 h-7 whitespace-nowrap rounded-md px-1 text-label-sm text-text-soft-400 outline-none',
        'flex items-center justify-center gap-1.5',
        'transition duration-300 ease-out',
        // focus
        'focus:outline-none',
        // active
        'data-[state=active]:text-text-strong-950',
        className,
      )}
      {...rest}
    />
  );
});
SegmentedControlTrigger.displayName = 'SegmentedControlTrigger';
 
const SegmentedControlContent = React.forwardRef<
  React.ComponentRef<typeof TabsPrimitive.Content>,
  React.ComponentPropsWithoutRef<typeof TabsPrimitive.Content>
>(({ ...rest }, forwardedRef) => {
  return <TabsPrimitive.Content ref={forwardedRef} {...rest} />;
});
SegmentedControlContent.displayName = 'SegmentedControlContent';
 
export {
  SegmentedControlRoot as Root,
  SegmentedControlList as List,
  SegmentedControlTrigger as Trigger,
  SegmentedControlContent as Content,
};