Animated Tab Background

Animated Tab Background is a React and Tailwind CSS background component from Motion Primitives, licensed MIT. Copy it and paste it into your project.

Motion Primitives MIT backgrounds

What it is

Animated Tab Background is a React and Tailwind CSS background component from Motion Primitives, licensed MIT. Copy it and paste it into your project.

How to use it

Open it in the catalogue, press copy, and paste it into your project. The prompt you copy carries the code and the rules that tell your agent to reproduce it without changing anything.

Open in the catalogue

Five free copies a month. No card.

Needs

npm i motion

Licence

This component comes from Motion Primitives and is redistributed under the MIT licence, which permits commercial use. The copyright notice travels with the code.

Animated Tab Background

components/core/animated-background.tsx

'use client';
import { cn } from '@/lib/utils';
import { AnimatePresence, Transition, motion } from 'motion/react';
import {
  Children,
  cloneElement,
  ReactElement,
  useEffect,
  useState,
  useId,
} from 'react';

export type AnimatedBackgroundProps = {
  children:
    | ReactElement<{ 'data-id': string }>[]
    | ReactElement<{ 'data-id': string }>;
  defaultValue?: string;
  onValueChange?: (newActiveId: string | null) => void;
  className?: string;
  transition?: Transition;
  enableHover?: boolean;
};

export function AnimatedBackground({
  children,
  defaultValue,
  onValueChange,
  className,
  transition,
  enableHover = false,
}: AnimatedBackgroundProps) {
  const [activeId, setActiveId] = useState<string | null>(null);
  const uniqueId = useId();

  const handleSetActiveId = (id: string | null) => {
    setActiveId(id);

    if (onValueChange) {
      onValueChange(id);
    }
  };

  useEffect(() => {
    if (defaultValue !== undefined) {
      setActiveId(defaultValue);
    }
  }, [defaultValue]);

  return Children.map(children, (child: any, index) => {
    const id = child.props['data-id'];

    const interactionProps = enableHover
      ? {
          onMouseEnter: () => handleSetActiveId(id),
          onMouseLeave: () => handleSetActiveId(null),
        }
      : {
          onClick: () => handleSetActiveId(id),
        };

    return cloneElement(
      child,
      {
        key: index,
        className: cn('relative inline-flex', child.props.className),
        'data-checked': activeId === id ? 'true' : 'false',
        ...interactionProps,
      },
      <>
        <AnimatePresence initial={false}>
          {activeId === id && (
            <motion.div
              layoutId={`background-${uniqueId}`}
              className={cn('absolute inset-0', className)}
              transition={transition}
              initial={{ opacity: defaultValue ? 1 : 0 }}
              animate={{
                opacity: 1,
              }}
              exit={{
                opacity: 0,
              }}
            />
          )}
        </AnimatePresence>
        <div className='z-10'>{child.props.children}</div>
      </>
    );
  });
}

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