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import { useState, useRef, useCallback } from 'react'
import { useIsomorphicLayoutEffect } from './useIsomorphicEffect'
export interface DimesionsReadOnly {
readonly width?: number
readonly height?: number
}
/**
*
* @param function cb(bounds: DimesionsReadOnly) => void
* called on resize with DimesionsReadOnly object as first argument
* @returns DimesionsReadOnly
*/
const useWindowSize = (
cb?: (bounds: DimesionsReadOnly) => void
): DimesionsReadOnly => {
const [bounds, setBounds] = useState<DimesionsReadOnly>({
width: undefined,
height: undefined,
})
// hold old dimensions in ref to avoid having to remake the callback below
const prevDimesions = useRef(bounds)
const handleResize = useCallback(() => {
const { innerHeight: height, innerWidth: width } = window
const newDimensions = {
height,
width,
}
Object.freeze(newDimensions)
// if dimensions are not equal, update and re-render
if (
!isObjectEqual(prevDimesions.current, newDimensions, ['width', 'height'])
) {
setBounds(newDimensions)
if (cb) {
cb(newDimensions)
}
}
}, [cb])
useIsomorphicLayoutEffect(() => {
// initial calc
handleResize()
window.addEventListener('resize', handleResize)
return () => {
window.removeEventListener('resize', handleResize)
}
}, [handleResize])
return bounds
}
const isObjectEqual = <TObject>(
oldObj: TObject,
newObj: TObject,
keys: Array<keyof TObject>
) => keys.every(key => oldObj[key] === newObj[key])
export { useWindowSize }
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