Storybook: Add UnitControl story

packages/block-editor/src/components/unit-control/stories/index.story.js

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+/**
+ * WordPress dependencies
+ */
+import { useState, useEffect } from '@wordpress/element';
+
+/**
+ * Internal dependencies
+ */
+import UnitControl from '../';
+
+const CUSTOM_UNITS = [
+	{ value: 'px', label: 'px', default: 0 },
+	{ value: 'em', label: 'em', default: 0 },
+	{ value: 'rem', label: 'rem', default: 0 },
+];
+
+/**
+ * UnitControl Properties
+ */
+export default {
+	title: 'BlockEditor/UnitControl',
+	component: UnitControl,
+	argTypes: {
+		onChange: {
+			action: 'onChange',
+			description: 'Callback function when the value changes.',
+			table: {
+				type: { summary: 'function' },
+			},
+		},
+		onUnitChange: {
+			action: 'onUnitChange',
+			description: 'Callback function when the unit changes.',
+			table: {
+				type: { summary: 'function' },
+			},
+		},
+		labelPosition: {
+			control: 'select',
+			options: [ 'top', 'side', 'bottom' ],
+			description: 'The position of the label.',
+			table: {
+				type: { summary: 'string' },
+				defaultValue: { summary: 'top' },
+			},
+		},
+		label: {
+			control: 'text',
+			description: 'The label for the control.',
+			table: {
+				type: { summary: 'string' },
+			},
+		},
+		value: {
+			control: 'text',
+			description: 'The value of the control.',
+			table: {
+				type: { summary: 'string' },
+			},
+		},
+		size: {
+			control: 'select',
+			options: [ 'small', 'medium' ],
+			description: 'The size of the control.',
+			table: {
+				type: { summary: 'string' },
+				defaultValue: { summary: 'medium' },
+			},
+		},
+		disabled: {
+			control: 'boolean',
+			description: 'Whether the control is disabled.',
+			table: {
+				type: { summary: 'boolean' },
+				defaultValue: { summary: false },
+			},
+		},
+	},
+	render: function Render( { onChange, onUnitChange, value, ...args } ) {
+		const [ componentValue, setComponentValue ] = useState( value || '' );
+
+		useEffect( () => {
+			setComponentValue( value );
+		}, [ value ] );
+
+		const handleValueChange = ( newValue ) => {
+			setComponentValue( newValue );
+			if ( onChange ) {
+				onChange( newValue );
+			}
+		};
+
+		return (
+			<UnitControl
+				{ ...args }
+				value={ componentValue }
+				onChange={ handleValueChange }
+				onUnitChange={ onUnitChange }
+			/>
+		);
+	},
+};
+
+/**
+ * Story demonstrating UnitControl with default settings
+ */
+export const Default = {
+	args: {
+		label: 'Default Unit Control',
+		value: '10',
+		size: 'medium',
+		labelPosition: 'top',
+	},
+};
+
+/**
+ * Story demonstrating UnitControl with custom units
+ */
+export const CustomUnits = {
+	args: {
+		...Default.args,
+		label: 'Custom Units',
+		units: CUSTOM_UNITS,
+	},
+};
+
+/**
+ * Story demonstrating UnitControl in disabled state
+ */
+export const Disabled = {
+	args: {
+		...Default.args,
+		label: 'Disabled Unit Control',
+		disabled: true,
+	},
+};