How to create a custom hook for handling responsive font sizes in Next.js



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Creating a custom hook for handling responsive font sizes in Next.js involves using the useEffect hook to dynamically calculate and set font sizes based on the window size. Below is an example of how you can achieve this:

jsx
// customHooks/useResponsiveFontSize.js
import { useEffect, useState } from 'react';

const useResponsiveFontSize = (baseFontSize = 16) => {
  const [fontSize, setFontSize] = useState(baseFontSize);

  useEffect(() => {
    const handleResize = () => {
      // Adjust the calculation based on your responsive font size logic
      const newFontSize = Math.max(baseFontSize, Math.min(window.innerWidth / 100, 2)) * baseFontSize;
      setFontSize(newFontSize);
    };

    // Initial font size calculation
    handleResize();

    // Event listener for window resize
    window.addEventListener('resize', handleResize);

    // Cleanup the event listener on component unmount
    return () => {
      window.removeEventListener('resize', handleResize);
    };
  }, [baseFontSize]);

  return fontSize;
};

export default useResponsiveFontSize;

Now, you can use this custom hook in your Next.js components:

jsx
// components/MyComponent.js
import React from 'react';
import useResponsiveFontSize from '../customHooks/useResponsiveFontSize';

const MyComponent = () => {
  const fontSize = useResponsiveFontSize();

  return (
    <div style={{ fontSize: `${fontSize}px` }}>
      {/* Your component content */}
      Responsive Font Size
    </div>
  );
};

export default MyComponent;

In this example, the useResponsiveFontSize hook takes an optional baseFontSize parameter, which defaults to 16. The font size is calculated based on the window width and a custom formula. You may adjust the formula according to your design requirements.

Remember to import and use the custom hook in your components where you want to make the font size responsive.

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