React Picture-in-Picture Hook

This challenge asks you to create a custom React hook, usePictureInPicture, that provides an easy and declarative way to manage the Picture-in-Picture (PiP) state for HTML video elements. This hook will be essential for building modern media players with advanced viewing features.

Problem Description

Your task is to implement a React hook called usePictureInPicture that abstracts the browser's native Picture-in-Picture API. This hook should manage the process of entering and exiting PiP mode for a given video element and provide the current PiP state.

Key Requirements:

1. usePictureInPicture(videoElementRef): The hook should accept a RefObject pointing to an HTML <video> element.
2. isInPictureInPicture: The hook should return a boolean state variable indicating whether the video is currently in Picture-in-Picture mode.
3. enterPictureInPicture(): A function to attempt to enter Picture-in-Picture mode for the associated video element.
4. exitPictureInPicture(): A function to attempt to exit Picture-in-Picture mode for the associated video element.
5. Event Handling: The hook must listen for the enterpictureinpicture and leavepictureinpicture events on the video element to accurately update the isInPictureInPicture state.
6. Error Handling: Gracefully handle cases where the browser does not support Picture-in-Picture or if an attempt to enter/exit fails.

Expected Behavior:

• When enterPictureInPicture() is called and successful, isInPictureInPicture should become true.
• When exitPictureInPicture() is called and successful, isInPictureInPicture should become false.
• The isInPictureInPicture state should update automatically when the user manually toggles PiP mode (e.g., via browser controls, if applicable).
• If the video element is not provided or invalid, the hook should not throw errors and ideally return default states.

Edge Cases:

• Browser without PiP support.
• Calling enterPictureInPicture() when already in PiP.
• Calling exitPictureInPicture() when not in PiP.
• The video element not being mounted or available when enterPictureInPicture() or exitPictureInPicture() is called.

Examples

Example 1: Basic Usage

import React, { useRef } from 'react';
import usePictureInPicture from './usePictureInPicture'; // Assuming hook is in this file

function VideoPlayer() {
  const videoRef = useRef<HTMLVideoElement>(null);
  const { isInPictureInPicture, enterPictureInPicture, exitPictureInPicture } = usePictureInPicture(videoRef);

  return (
    <div>
      <video ref={videoRef} width="400" controls>
        <source src="your-video.mp4" type="video/mp4" />
      </video>
      <div>
        <button onClick={enterPictureInPicture} disabled={isInPictureInPicture}>
          Enter Picture-in-Picture
        </button>
        <button onClick={exitPictureInPicture} disabled={!isInPictureInPicture}>
          Exit Picture-in-Picture
        </button>
      </div>
      <p>In PiP: {isInPictureInPicture ? 'Yes' : 'No'}</p>
    </div>
  );
}

Explanation:

This example shows how a component would consume the usePictureInPicture hook. It renders a video element and provides buttons to control PiP mode. The isInPictureInPicture state is displayed to the user, and the buttons are disabled appropriately.

Example 2: Handling PiP API Not Available

If the browser doesn't support the Picture-in-Picture API, the enterPictureInPicture and exitPictureInPicture functions should ideally be no-ops or return promises that resolve immediately without effect, and isInPictureInPicture should always be false.

Explanation:

The hook should detect the lack of API support and prevent errors. Users clicking the buttons would have no visual feedback or changes in state.

Constraints

• The hook must be implemented in TypeScript.
• The hook should return an object with isInPictureInPicture, enterPictureInPicture, and exitPictureInPicture.
• The enterPictureInPicture and exitPictureInPicture functions should return a Promise<void> to align with the native API.
• Cleanup: Ensure that event listeners are removed when the component unmounts.

Notes

• The native Picture-in-Picture API is available on HTMLVideoElement. You'll need to check for the existence of document.pictureInPictureEnabled and videoElement.requestPictureInPicture().
• Consider what happens if the videoElementRef.current is null when the functions are called.
• The enterPictureInPicture method returns a Promise that resolves when the video is successfully put into PiP mode and rejects if it fails. Your hook should reflect this.