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import { DndContext, DragMoveEvent, useDraggable } from '@dnd-kit/core';
import { useThrottle } from '@wordpress/compose';
import { useRef } from 'react';
interface ResizeHandleProps {
disabled?: boolean;
itemId?: string;
onResize?: ( delta: { width: number; height: number } ) => void;
onResizeEnd?: () => void;
}
function ResizeHandle( { disabled = false, itemId }: ResizeHandleProps ) {
const { attributes, listeners, setNodeRef } = useDraggable( {
id: 'draggable',
data: { itemId },
} );
const resizeHandleStyle = {
position: 'absolute' as const,
bottom: '0',
right: '0',
width: '0',
height: '0',
cursor: 'nwse-resize',
borderStyle: 'solid',
borderWidth: '0 0 12px 12px',
borderColor: 'transparent transparent var(--wp-admin-theme-color, #0087be) transparent',
zIndex: 1,
display: disabled ? 'none' : 'block',
};
return <div ref={ setNodeRef } style={ resizeHandleStyle } { ...listeners } { ...attributes } />;
}
export default function ResizeHandleWrapper( props: ResizeHandleProps ) {
const initialAnchorPosition = useRef< DOMRect | null >( null );
// Throttle the resize event to avoid excessive calls
// and improve performance during drag operations
const throttleDelay = 60;
const throttledResize = useThrottle( ( delta: { width: number; height: number } ) => {
if ( props.onResize ) {
props.onResize( delta );
}
}, throttleDelay );
const handleDragStart = ( event: DragMoveEvent ) => {
// @ts-expect-error I expect this to be always defined.
initialAnchorPosition.current = event.activatorEvent.target.getBoundingClientRect();
};
const handleDragMove = ( event: DragMoveEvent ) => {
if ( ! initialAnchorPosition.current ) {
return;
}
// @ts-expect-error I expect this to be always defined.
const currentPosition = event.activatorEvent.target.getBoundingClientRect();
const deltaX = currentPosition.x - initialAnchorPosition.current.x;
const deltaY = currentPosition.y - initialAnchorPosition.current.y;
const anchorDelta = {
width: deltaX,
height: deltaY,
};
if ( event.active.id === 'draggable' ) {
const delta = {
width: event.delta.x - anchorDelta.width,
height: event.delta.y - anchorDelta.height,
};
throttledResize( delta );
}
};
const handleDragEnd = () => {
initialAnchorPosition.current = null;
if ( props.onResizeEnd ) {
props.onResizeEnd();
}
};
return (
<DndContext
onDragStart={ handleDragStart }
onDragMove={ handleDragMove }
onDragEnd={ handleDragEnd }
>
<ResizeHandle { ...props } />
</DndContext>
);
}
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