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…64943) * Simplify useResizeObserver * Loop through all resize entries * Add `useEvent` util. * Add `useObserveElementSize` util. * Simplify `useResizeObserver` by using `useEvent` and `useObserveElementSize`. * Switch to layout effect and accept refs too. * Prevent initial re-render in ResizeElement. * Better error message. * Improved example of useEvent. * Update packages/compose/src/hooks/use-event/index.ts Co-authored-by: Marin Atanasov <[email protected]> * Sync docs. * Avoid redundant resize listener calls. * Switch to structural check. * Improve example. * Fix docs. * Make `useObserveElementSize` generic. * New API that returns a ref. * Make utility private for now. * Mark legacy `useResizeObserver` as such. * Rename `useObserveElementSize` to `useResizeObserver`. * Add return type. * Add signature as overload. * Add support for legacy API. * Move into subdirectory. * Minor import fix. * Fix docgen to support overloads (will pick up the first function signature). * Replace legacy utility with the new one. * Apply feedback. * Clean up and document. * Added changelog entries. --------- Co-authored-by: jsnajdr <[email protected]> Co-authored-by: DaniGuardiola <[email protected]> Co-authored-by: tyxla <[email protected]> Co-authored-by: ciampo <[email protected]> Co-authored-by: youknowriad <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| /** | ||
| * WordPress dependencies | ||
| */ | ||
| import { useRef, useInsertionEffect, useCallback } from '@wordpress/element'; | ||
|
|
||
| /** | ||
| * Any function. | ||
| */ | ||
| export type AnyFunction = ( ...args: any ) => any; | ||
|
|
||
| /** | ||
| * Creates a stable callback function that has access to the latest state and | ||
| * can be used within event handlers and effect callbacks. Throws when used in | ||
| * the render phase. | ||
| * | ||
| * @param callback The callback function to wrap. | ||
| * | ||
| * @example | ||
| * | ||
| * ```tsx | ||
| * function Component( props ) { | ||
| * const onClick = useEvent( props.onClick ); | ||
| * useEffect( () => { | ||
| * onClick(); | ||
| * // Won't trigger the effect again when props.onClick is updated. | ||
| * }, [ onClick ] ); | ||
| * // Won't re-render Button when props.onClick is updated (if `Button` is | ||
| * // wrapped in `React.memo`). | ||
| * return <Button onClick={ onClick } />; | ||
| * } | ||
| * ``` | ||
| */ | ||
| export default function useEvent< T extends AnyFunction >( | ||
| /** | ||
| * The callback function to wrap. | ||
| */ | ||
| callback?: T | ||
| ) { | ||
| const ref = useRef< AnyFunction | undefined >( () => { | ||
| throw new Error( | ||
| 'Callbacks created with `useEvent` cannot be called during rendering.' | ||
| ); | ||
| } ); | ||
| useInsertionEffect( () => { | ||
| ref.current = callback; | ||
| } ); | ||
| return useCallback< AnyFunction >( | ||
| ( ...args ) => ref.current?.( ...args ), | ||
| [] | ||
| ) as T; | ||
| } |
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119 changes: 119 additions & 0 deletions
119
packages/compose/src/hooks/use-resize-observer/index.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| /** | ||
| * WordPress dependencies | ||
| */ | ||
| import { useRef } from '@wordpress/element'; | ||
| /** | ||
| * Internal dependencies | ||
| */ | ||
| import useEvent from '../use-event'; | ||
| import type { ObservedSize } from './_legacy'; | ||
| import _useLegacyResizeObserver from './_legacy'; | ||
| /** | ||
| * External dependencies | ||
| */ | ||
| import type { ReactElement } from 'react'; | ||
|
|
||
| // This is the current implementation of `useResizeObserver`. | ||
| // | ||
| // The legacy implementation is still supported for backwards compatibility. | ||
| // This is achieved by overloading the exported function with both signatures, | ||
| // and detecting which API is being used at runtime. | ||
| function _useResizeObserver< T extends HTMLElement >( | ||
| callback: ResizeObserverCallback, | ||
| resizeObserverOptions: ResizeObserverOptions = {} | ||
| ): ( element?: T | null ) => void { | ||
| const callbackEvent = useEvent( callback ); | ||
|
|
||
| const observedElementRef = useRef< T | null >(); | ||
| const resizeObserverRef = useRef< ResizeObserver >(); | ||
| return useEvent( ( element?: T | null ) => { | ||
| if ( element === observedElementRef.current ) { | ||
| return; | ||
| } | ||
| observedElementRef.current = element; | ||
|
|
||
| // Set up `ResizeObserver`. | ||
| resizeObserverRef.current ??= new ResizeObserver( callbackEvent ); | ||
| const { current: resizeObserver } = resizeObserverRef; | ||
|
|
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| // Unobserve previous element. | ||
| if ( observedElementRef.current ) { | ||
| resizeObserver.unobserve( observedElementRef.current ); | ||
| } | ||
|
|
||
| // Observe new element. | ||
| if ( element ) { | ||
| resizeObserver.observe( element, resizeObserverOptions ); | ||
| } | ||
| } ); | ||
| } | ||
|
|
||
| /** | ||
| * Sets up a [`ResizeObserver`](https://developer.mozilla.org/en-US/docs/Web/API/Resize_Observer_API) | ||
| * for an HTML or SVG element. | ||
| * | ||
| * Pass the returned setter as a callback ref to the React element you want | ||
| * to observe, or use it in layout effects for advanced use cases. | ||
| * | ||
| * @example | ||
| * | ||
| * ```tsx | ||
| * const setElement = useResizeObserver( | ||
| * ( resizeObserverEntries ) => console.log( resizeObserverEntries ), | ||
| * { box: 'border-box' } | ||
| * ); | ||
| * <div ref={ setElement } />; | ||
| * | ||
| * // The setter can be used in other ways, for example: | ||
| * useLayoutEffect( () => { | ||
| * setElement( document.querySelector( `data-element-id="${ elementId }"` ) ); | ||
| * }, [ elementId ] ); | ||
| * ``` | ||
| * | ||
| * @param callback The `ResizeObserver` callback - [MDN docs](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver/ResizeObserver#callback). | ||
| * @param options Options passed to `ResizeObserver.observe` when called - [MDN docs](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver/observe#options). Changes will be ignored. | ||
| */ | ||
| export default function useResizeObserver< T extends Element >( | ||
| /** | ||
| * The `ResizeObserver` callback - [MDN docs](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver/ResizeObserver#callback). | ||
| */ | ||
| callback: ResizeObserverCallback, | ||
| /** | ||
| * Options passed to `ResizeObserver.observe` when called - [MDN docs](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver/observe#options). Changes will be ignored. | ||
| */ | ||
| options?: ResizeObserverOptions | ||
| ): ( element?: T | null ) => void; | ||
|
|
||
| /** | ||
| * **This is a legacy API and should not be used.** | ||
| * | ||
| * @deprecated Use the other `useResizeObserver` API instead: `const ref = useResizeObserver( ( entries ) => { ... } )`. | ||
| * | ||
| * Hook which allows to listen to the resize event of any target element when it changes size. | ||
| * _Note: `useResizeObserver` will report `null` sizes until after first render. | ||
| * | ||
| * @example | ||
| * | ||
| * ```js | ||
| * const App = () => { | ||
| * const [ resizeListener, sizes ] = useResizeObserver(); | ||
| * | ||
| * return ( | ||
| * <div> | ||
| * { resizeListener } | ||
| * Your content here | ||
| * </div> | ||
| * ); | ||
| * }; | ||
| * ``` | ||
| */ | ||
| export default function useResizeObserver(): [ ReactElement, ObservedSize ]; | ||
|
|
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| export default function useResizeObserver< T extends HTMLElement >( | ||
| callback?: ResizeObserverCallback, | ||
| options: ResizeObserverOptions = {} | ||
| ): ( ( element?: T | null ) => void ) | [ ReactElement, ObservedSize ] { | ||
| return callback | ||
| ? _useResizeObserver( callback, options ) | ||
| : _useLegacyResizeObserver(); | ||
| } |
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