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inbetween.js
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inbetween.js
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/**
* External dependencies
*/
import classnames from 'classnames';
/**
* WordPress dependencies
*/
import { useSelect } from '@wordpress/data';
import {
useMemo,
createContext,
useReducer,
useLayoutEffect,
} from '@wordpress/element';
import { Popover } from '@wordpress/components';
import { isRTL } from '@wordpress/i18n';
/**
* Internal dependencies
*/
import { store as blockEditorStore } from '../../store';
import { __unstableUseBlockElement as useBlockElement } from '../block-list/use-block-props/use-block-refs';
import usePopoverScroll from './use-popover-scroll';
const MAX_POPOVER_RECOMPUTE_COUNTER = Number.MAX_SAFE_INTEGER;
export const InsertionPointOpenRef = createContext();
function BlockPopoverInbetween( {
previousClientId,
nextClientId,
children,
__unstablePopoverSlot,
__unstableContentRef,
...props
} ) {
// This is a temporary hack to get the inbetween inserter to recompute properly.
const [ popoverRecomputeCounter, forcePopoverRecompute ] = useReducer(
// Module is there to make sure that the counter doesn't overflow.
( s ) => ( s + 1 ) % MAX_POPOVER_RECOMPUTE_COUNTER,
0
);
const { orientation, rootClientId, isVisible } = useSelect(
( select ) => {
const {
getBlockListSettings,
getBlockRootClientId,
isBlockVisible,
} = select( blockEditorStore );
const _rootClientId = getBlockRootClientId(
previousClientId ?? nextClientId
);
return {
orientation:
getBlockListSettings( _rootClientId )?.orientation ||
'vertical',
rootClientId: _rootClientId,
isVisible:
isBlockVisible( previousClientId ) &&
isBlockVisible( nextClientId ),
};
},
[ previousClientId, nextClientId ]
);
const previousElement = useBlockElement( previousClientId );
const nextElement = useBlockElement( nextClientId );
const isVertical = orientation === 'vertical';
const style = useMemo( () => {
if (
// popoverRecomputeCounter is by definition always equal or greater than 0.
// This check is only there to satisfy the correctness of the
// exhaustive-deps rule for the `useMemo` hook.
popoverRecomputeCounter < 0 ||
( ! previousElement && ! nextElement ) ||
! isVisible
) {
return {};
}
const previousRect = previousElement
? previousElement.getBoundingClientRect()
: null;
const nextRect = nextElement
? nextElement.getBoundingClientRect()
: null;
if ( isVertical ) {
return {
width: previousRect ? previousRect.width : nextRect.width,
height:
nextRect && previousRect
? nextRect.top - previousRect.bottom
: 0,
};
}
let width = 0;
if ( previousRect && nextRect ) {
width = isRTL()
? previousRect.left - nextRect.right
: nextRect.left - previousRect.right;
}
return {
width,
height: previousRect ? previousRect.height : nextRect.height,
};
}, [
previousElement,
nextElement,
isVertical,
popoverRecomputeCounter,
isVisible,
] );
const popoverAnchor = useMemo( () => {
if (
// popoverRecomputeCounter is by definition always equal or greater than 0.
// This check is only there to satisfy the correctness of the
// exhaustive-deps rule for the `useMemo` hook.
popoverRecomputeCounter < 0 ||
( ! previousElement && ! nextElement ) ||
! isVisible
) {
return undefined;
}
const { ownerDocument } = previousElement || nextElement;
return {
ownerDocument,
getBoundingClientRect() {
const previousRect = previousElement
? previousElement.getBoundingClientRect()
: null;
const nextRect = nextElement
? nextElement.getBoundingClientRect()
: null;
let left = 0;
let top = 0;
if ( isVertical ) {
// vertical
top = previousRect ? previousRect.bottom : nextRect.top;
if ( isRTL() ) {
// vertical, rtl
left = previousRect
? previousRect.right
: nextRect.right;
} else {
// vertical, ltr
left = previousRect ? previousRect.left : nextRect.left;
}
} else {
top = previousRect ? previousRect.top : nextRect.top;
if ( isRTL() ) {
// non vertical, rtl
left = previousRect
? previousRect.left
: nextRect.right;
} else {
// non vertical, ltr
left = previousRect
? previousRect.right
: nextRect.left;
}
}
return new window.DOMRect( left, top, 0, 0 );
},
};
}, [
previousElement,
nextElement,
popoverRecomputeCounter,
isVertical,
isVisible,
] );
const popoverScrollRef = usePopoverScroll( __unstableContentRef );
// This is only needed for a smooth transition when moving blocks.
// When blocks are moved up/down, their position can be set by
// updating the `transform` property manually (i.e. without using CSS
// transitions or animations). The animation, which can also scroll the block
// editor, can sometimes cause the position of the Popover to get out of sync.
// A MutationObserver is therefore used to make sure that changes to the
// selectedElement's attribute (i.e. `transform`) can be tracked and used to
// trigger the Popover to rerender.
useLayoutEffect( () => {
if ( ! previousElement ) {
return;
}
const observer = new window.MutationObserver( forcePopoverRecompute );
observer.observe( previousElement, { attributes: true } );
return () => {
observer.disconnect();
};
}, [ previousElement ] );
useLayoutEffect( () => {
if ( ! nextElement ) {
return;
}
const observer = new window.MutationObserver( forcePopoverRecompute );
observer.observe( nextElement, { attributes: true } );
return () => {
observer.disconnect();
};
}, [ nextElement ] );
useLayoutEffect( () => {
if ( ! previousElement ) {
return;
}
previousElement.ownerDocument.defaultView.addEventListener(
'resize',
forcePopoverRecompute
);
return () => {
previousElement.ownerDocument.defaultView?.removeEventListener(
'resize',
forcePopoverRecompute
);
};
}, [ previousElement ] );
// If there's either a previous or a next element, show the inbetween popover.
// Note that drag and drop uses the inbetween popover to show the drop indicator
// before the first block and after the last block.
if ( ( ! previousElement && ! nextElement ) || ! isVisible ) {
return null;
}
/* eslint-disable jsx-a11y/no-static-element-interactions, jsx-a11y/click-events-have-key-events */
// While ideally it would be enough to capture the
// bubbling focus event from the Inserter, due to the
// characteristics of click focusing of `button`s in
// Firefox and Safari, it is not reliable.
//
// See: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/button#Clicking_and_focus
return (
<Popover
ref={ popoverScrollRef }
animate={ false }
anchor={ popoverAnchor }
focusOnMount={ false }
// Render in the old slot if needed for backward compatibility,
// otherwise render in place (not in the default popover slot).
__unstableSlotName={ __unstablePopoverSlot || null }
// Forces a remount of the popover when its position changes
// This makes sure the popover doesn't animate from its previous position.
key={ nextClientId + '--' + rootClientId }
{ ...props }
className={ classnames(
'block-editor-block-popover',
'block-editor-block-popover__inbetween',
props.className
) }
resize={ false }
flip={ false }
placement="bottom-start"
>
<div
className="block-editor-block-popover__inbetween-container"
style={ style }
>
{ children }
</div>
</Popover>
);
/* eslint-enable jsx-a11y/no-static-element-interactions, jsx-a11y/click-events-have-key-events */
}
export default BlockPopoverInbetween;