In this tutorial, we will create a custom React hook called useFullscreenEffect that will allow us to handle side effects related to fullscreen mode. We will be using React and the fullscreenchange event provided by the browser’s Document object.

Table of Contents

• Introduction
• Prerequisites
• Creating the useFullscreenEffect Hook
• Using the useFullscreenEffect Hook
• Conclusion

Introduction

Fullscreen mode is a common feature in many web applications. It allows users to view content in fullscreen without any distractions. When working with fullscreen mode, we might need to perform certain actions or invoke specific side effects. This is where our custom useFullscreenEffect hook comes into play.

Prerequisites

To follow along with this tutorial, make sure you have the following installed:

• Node.js
• npm (Node Package Manager)
• React

Creating the useFullscreenEffect Hook

Let’s start by creating a new file called useFullscreenEffect.js and define our custom hook. The hook will take a callback function as an argument, which will be called whenever the fullscreen mode changes.

import { useEffect } from 'react';

const useFullscreenEffect = (callback) => {
  useEffect(() => {
    const handleFullscreenChange = () => {
      callback(document.fullscreenElement !== null);
    };

    document.addEventListener('fullscreenchange', handleFullscreenChange);

    return () => {
      document.removeEventListener('fullscreenchange', handleFullscreenChange);
    };
  }, [callback]);
};

export default useFullscreenEffect;

Here, we are using the useEffect hook to add and remove event listeners for the fullscreenchange event. In the handleFullscreenChange function, we check if document.fullscreenElement is null to determine if the fullscreen mode is active or not. We then call the provided callback function with a boolean parameter indicating the current fullscreen mode.

Using the useFullscreenEffect Hook

Now that we have created our custom hook, let’s see how we can use it in a React component.

import React from 'react';
import useFullscreenEffect from './useFullscreenEffect';

const App = () => {
  const handleFullscreenChange = (isFullscreen) => {
    if (isFullscreen) {
      // Logic for fullscreen mode enabled
    } else {
      // Logic for fullscreen mode disabled
    }
  };

  useFullscreenEffect(handleFullscreenChange);

  return (
    <div>
      {/* Your app content */}
    </div>
  );
};

export default App;

In this example, we import our custom useFullscreenEffect hook and define a callback function handleFullscreenChange. Inside this function, we can implement the logic that needs to be executed when the fullscreen mode changes. We then call the useFullscreenEffect hook with the handleFullscreenChange function.

Conclusion

Creating a custom hook like useFullscreenEffect allows us to encapsulate the logic for handling side effects related to fullscreen mode in a reusable manner. It simplifies the management of fullscreen mode changes and provides a clean and structured approach.

Now you can easily incorporate fullscreen mode in your React applications and handle any related side effects with ease.