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Site Editor: Improve the frame animation (#60363)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| /** | ||
| * External dependencies | ||
| */ | ||
| import { Controller } from '@react-spring/web'; | ||
|
|
||
| /** | ||
| * WordPress dependencies | ||
| */ | ||
| import { useLayoutEffect, useMemo, useRef } from '@wordpress/element'; | ||
|
|
||
| function getAbsolutePosition( element ) { | ||
| return { | ||
| top: element.offsetTop, | ||
| left: element.offsetLeft, | ||
| }; | ||
| } | ||
|
|
||
| const ANIMATION_DURATION = 300; | ||
|
|
||
| /** | ||
| * Hook used to compute the styles required to move a div into a new position. | ||
| * | ||
| * The way this animation works is the following: | ||
| * - It first renders the element as if there was no animation. | ||
| * - It takes a snapshot of the position of the block to use it | ||
| * as a destination point for the animation. | ||
| * - It restores the element to the previous position using a CSS transform | ||
| * - It uses the "resetAnimation" flag to reset the animation | ||
| * from the beginning in order to animate to the new destination point. | ||
| * | ||
| * @param {Object} $1 Options | ||
| * @param {*} $1.triggerAnimationOnChange Variable used to trigger the animation if it changes. | ||
| */ | ||
| function useMovingAnimation( { triggerAnimationOnChange } ) { | ||
| const ref = useRef(); | ||
|
|
||
| // Whenever the trigger changes, we need to take a snapshot of the current | ||
| // position of the block to use it as a destination point for the animation. | ||
| const { previous, prevRect } = useMemo( | ||
| () => ( { | ||
| previous: ref.current && getAbsolutePosition( ref.current ), | ||
| prevRect: ref.current && ref.current.getBoundingClientRect(), | ||
| } ), | ||
| // eslint-disable-next-line react-hooks/exhaustive-deps | ||
| [ triggerAnimationOnChange ] | ||
| ); | ||
|
|
||
| useLayoutEffect( () => { | ||
| if ( ! previous || ! ref.current ) { | ||
| return; | ||
| } | ||
|
|
||
| // We disable the animation if the user has a preference for reduced | ||
| // motion. | ||
| const disableAnimation = window.matchMedia( | ||
| '(prefers-reduced-motion: reduce)' | ||
| ).matches; | ||
|
|
||
| if ( disableAnimation ) { | ||
| return; | ||
| } | ||
|
|
||
| const controller = new Controller( { | ||
| x: 0, | ||
| y: 0, | ||
| width: prevRect.width, | ||
| height: prevRect.height, | ||
| config: { duration: ANIMATION_DURATION }, | ||
| onChange( { value } ) { | ||
| if ( ! ref.current ) { | ||
| return; | ||
| } | ||
| let { x, y, width, height } = value; | ||
| x = Math.round( x ); | ||
| y = Math.round( y ); | ||
| width = Math.round( width ); | ||
| height = Math.round( height ); | ||
| const finishedMoving = x === 0 && y === 0; | ||
| ref.current.style.transformOrigin = 'center center'; | ||
| ref.current.style.transform = finishedMoving | ||
| ? null // Set to `null` to explicitly remove the transform. | ||
| : `translate3d(${ x }px,${ y }px,0)`; | ||
| ref.current.style.width = finishedMoving | ||
| ? null | ||
| : `${ width }px`; | ||
| ref.current.style.height = finishedMoving | ||
| ? null | ||
| : `${ height }px`; | ||
| }, | ||
| } ); | ||
|
|
||
| ref.current.style.transform = undefined; | ||
| const destination = ref.current.getBoundingClientRect(); | ||
|
|
||
| const x = Math.round( prevRect.left - destination.left ); | ||
| const y = Math.round( prevRect.top - destination.top ); | ||
| const width = destination.width; | ||
| const height = destination.height; | ||
|
|
||
| controller.start( { | ||
| x: 0, | ||
| y: 0, | ||
| width, | ||
| height, | ||
| from: { x, y, width: prevRect.width, height: prevRect.height }, | ||
| } ); | ||
|
|
||
| return () => { | ||
| controller.stop(); | ||
| controller.set( { | ||
| x: 0, | ||
| y: 0, | ||
| width: prevRect.width, | ||
| height: prevRect.height, | ||
| } ); | ||
| }; | ||
| }, [ previous, prevRect ] ); | ||
|
|
||
| return ref; | ||
| } | ||
|
|
||
| export default useMovingAnimation; |
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