useRestHeight

The useRestHeight Hook is a custom React Hook that calculates the remaining height of a parent element after subtracting the height of its child elements and any specified offsets. It returns an array with the remaining height and a function to recalculate the height.

Installation

To use useRestHeight, you need to install it as a dependency in your React project. You can do this via npm or yarn.

npm install microhook

yarn add microhook

Usage

Here is an example of how to use the useRestHeight Hook:

import React, { useRef } from 'react';
import { useRestHeight } from 'microhook';

function MyComponent() {
  const parentRef = useRef(null);
  const childRef1 = useRef(null);
  const childRef2 = useRef(null);

  const [restHeight, { recalculateHeight }] = useRestHeight(
    parentRef,
    [childRef1, childRef2],
    [10, 20],
  );

  return (
    <div ref={parentRef}>
      <div ref={childRef1}>Child element 1</div>
      <div ref={childRef2}>Child element 2</div>
      <div>Remaining height: {restHeight}px</div>
      <button onClick={recalculateHeight}>Recalculate height</button>
    </div>
  );
}

The useRestHeight Hook takes three arguments:

• parent: The parent element or its RefObject.
• children: The child elements or their RefObjects.
• offsets: An optional array of offsets to subtract from the parent element's height.

The useRestHeight Hook returns an array with two elements:

• restHeight: The remaining height of the parent element.
• actions: An object with the following action:
• recalculateHeight: A function that recalculates the height of the parent element.

Conclusion

The useRestHeight Hook is a useful tool for calculating the remaining height of a parent element. It can be helpful in situations where you need to position elements within a container with a fixed height, such as a modal or a sidebar. The Hook is easy to use and comes with a recalculateHeight function that makes it simple to update the height whenever the content of the parent or child elements changes.