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Edit File: LetterSpacingControl.js

import {
    Button,
    RangeControl,
    ButtonGroup
} from '@wordpress/components';
import {useState} from '@wordpress/element';
import React from "react";

const LetterSpacingControl = ({attributes, setAttributes}) => {

const unitOptions = ['px', 'em'];

const getLetterSpacingUnit = () => {
        const letterSpacing = attributes.letter_spacing;
        if (letterSpacing) {
            const match = letterSpacing.match(/[a-zA-Z%]+$/);
            return match ? match[0] : 'px';
        }
        return 'px';
    };

const [unit, setUnit] = useState(getLetterSpacingUnit());
    const getLetterSpacingValue = () => {
        if (attributes.letter_spacing) {
            return parseFloat(attributes.letter_spacing);
        }
        return "";
    };

return (
        <div className="letter-spacing-control">
            <div className="latepoint-block-header">
                <label className="latepoint-control-label">Letter Spacing</label>

<Button className="latepoint-block-reset"
                            onClick={() => handleLetterSpacingChange("")}
                            isSmall
                            disabled={attributes.letter_spacing === ''}
                            icon="dashicon dashicons dashicons-image-rotate"
                    />

<ButtonGroup className="latepoint-unit-selector">
                        {unitOptions.map((option) => (
                            <Button key={option} isPrimary={unit === option} onClick={() => handleUnitChange(option)}>
                                {option}
                            </Button>
                        ))}
                    </ButtonGroup>
                </div>
            </div>
            <RangeControl
                value={getLetterSpacingValue()}
                onChange={handleLetterSpacingChange}
                min="0"
                max="20"
                step="0.01"
            />
        </div>
    )
};

export default LetterSpacingControl;

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