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73 changes: 73 additions & 0 deletions
73
packages/cloud-cognitive/src/global/js/hooks/useResizeObserver.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| /** | ||
| * Copyright IBM Corp. 2023, 2023 | ||
| * | ||
| * This source code is licensed under the Apache-2.0 license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
| import { useRef, useState, useLayoutEffect } from 'react'; | ||
|
|
||
| export const useResizeObserver = ( | ||
| ref, | ||
| options = { callback: null, throttleInterval: 0 } | ||
| ) => { | ||
| const { callback, throttleInterval } = options; | ||
| const [width, setWidth] = useState(0); | ||
| const [height, setHeight] = useState(0); | ||
| const throttleTimeout = useRef(null); | ||
| const entriesToHandle = useRef(null); | ||
|
|
||
| useLayoutEffect(() => { | ||
| if (!ref?.current) { | ||
| return; | ||
| } | ||
|
|
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| const doCallbacks = () => { | ||
| if (!ref?.current || !Array.isArray(entriesToHandle?.current)) { | ||
| return; | ||
| } | ||
|
|
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| const entry = entriesToHandle.current[0]; | ||
|
|
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| setWidth(entry.contentRect.width); | ||
| setHeight(entry.contentRect.height); | ||
|
|
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| throttleTimeout.current = null; | ||
|
|
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| callback && callback(entry.contentRect); | ||
| }; | ||
|
|
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| let observer = new ResizeObserver((entries) => { | ||
| // always update entriesToHandle | ||
| entriesToHandle.current = entries; | ||
|
|
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| if (throttleInterval) { | ||
| // if a throttleInterval check for running timeout | ||
| if (throttleTimeout.current === null) { | ||
| // no live timeout set entries to handle and move on | ||
|
|
||
| // set up throttle | ||
| throttleTimeout.current = setTimeout(() => { | ||
| // do callbacks | ||
| doCallbacks(); | ||
| // reset throttle | ||
| throttleTimeout.current = null; | ||
| }, throttleInterval); | ||
| } | ||
| } else { | ||
| // no throttle do callbacks every time | ||
| doCallbacks(); | ||
| } | ||
| }); | ||
|
|
||
| // observe all refs passed | ||
| observer.observe(ref.current); | ||
|
|
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| return () => { | ||
| observer.disconnect(); | ||
| observer = null; | ||
| }; | ||
| // eslint-disable-next-line react-hooks/exhaustive-deps | ||
| }, [ref, options]); | ||
|
|
||
| return { width, height }; | ||
| }; |
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