Block Editor: Add documentation for SpacingSizesControl component

packages/block-editor/src/components/spacing-sizes-control/README.md

@@ -0,0 +1,113 @@
+# Spacing Sizes Control
+
+The SpacingSizesControl component provides a user interface for controlling spacing values in blocks. It supports single, axial, and separated input controls for different spacing configurations.
+
+## Description
+
+The SpacingSizesControl component is a flexible control that allows users to modify spacing values for different sides of a block. It supports three viewing modes:
+
+1. Single: Control one side at a time
+2. Axial: Control horizontal and vertical sides together
+3. Custom: Control each side separately
+
+![Spacing Sizes Control](https://i.postimg.cc/3RkzzfL6/Screenshot-2025-01-10-at-8-07-55-AM.png)
+
+## Usage
+
+```js
+import {
+	InspectorControls,
+	__experimentalSpacingSizesControl as SpacingSizesControl,
+} from '@wordpress/block-editor';
+import { View } from '@wordpress/primitives';
+import { useCustomUnits } from '@wordpress/components';
+
+const DimensionInput = ( { label, onChange, value = '' } ) => {
+	const availableUnits = [ 'px', 'em', 'rem', 'vw', 'vh' ];
+	const units = useCustomUnits( {
+		availableUnits,
+		defaultValues: { px: 100, em: 10, rem: 10, vw: 10, vh: 25 },
+	} );
+
+	const handleOnChange = ( unprocessedValue ) => {
+		onChange( unprocessedValue.all );
+	};
+
+	return (
+		<View className="tools-panel-item-spacing">
+			<SpacingSizesControl
+				values={ { all: value } }
+				onChange={ handleOnChange }
+				label={ label }
+				sides={ [ 'all' ] }
+				units={ units }
+				allowReset={ false }
+				splitOnAxis={ false }
+				showSideInLabel={ false }
+			/>
+		</View>
+	);
+};
+```
+
+## Props
+
+### `inputProps`
+
+-   Type: `Object`
+-   Required: No
+-   Description: Additional props to pass to the input controls.
+
+### `label`
+
+-   Type: `String`
+-   Required: Yes
+-   Description: Label for the control (e.g., "Height").
+
+### `minimumCustomValue`
+
+-   Type: `Number`
+-   Default: 0
+-   Description: Minimum value allowed for custom input.
+
+### `onChange`
+
+-   Type: `Function`
+-   Required: Yes
+-   Description: Callback function called when spacing values change. Receives an object containing the updated values.
+
+### `onMouseOut`
+
+-   Type: `Function`
+-   Required: No
+-   Description: Callback function called when mouse leaves the control.
+
+### `onMouseOver`
+
+-   Type: `Function`
+-   Required: No
+-   Description: Callback function called when mouse enters the control.
+
+### `showSideInLabel`
+
+-   Type: `Boolean`
+-   Default: true
+-   Description: Whether to show the side (top, right, etc.) in the control label.
+
+### `sides`
+
+-   Type: `Array`
+-   Default: ALL_SIDES (top, right, bottom, left)
+-   Description: Array of sides that can be controlled.
+
+### `useSelect`
+
+-   Type: `Boolean`
+-   Required: No
+-   Description: Whether to use a select control for predefined values.
+
+### `values`
+
+-   Type: `Object`
+-   Required: No
+-   Description: Object containing the current spacing values for each side.

packages/block-editor/src/components/spacing-sizes-control/index.js

@@ -25,6 +25,45 @@ import {
 	getInitialView,
 } from './utils';
 
+/**
+ * A flexible control for managing spacing values in the block editor. Supports single, axial,
+ * and separated input controls for different spacing configurations with automatic view selection
+ * based on current values and available sides.
+ *
+ * @see https://github.com/WordPress/gutenberg/blob/HEAD/packages/block-editor/src/components/spacing-sizes-control/README.md
+ *
+ * @example
+ * ```jsx
+ * function SpacerBlock() {
+ *   return (
+ *     <View className="tools-panel-item-spacing">
+ *       <SpacingSizesControl
+ *         values={{ all: value }}
+ *         onChange={handleOnChange}
+ *         label="Height"
+ *         units={units}
+ *         allowReset={false}
+ *         splitOnAxis={false}
+ *         showSideInLabel={false}
+ *       />
+ *     </View>
+ *   );
+ * }
+ * ```
+ *
+ * @param {Object}   props                    Component props.
+ * @param {Object}   props.inputProps         Additional props for input controls.
+ * @param {string}   props.label              Label for the control.
+ * @param {number}   props.minimumCustomValue Minimum value for custom input.
+ * @param {Function} props.onChange           Called when spacing values change.
+ * @param {Function} props.onMouseOut         Called when mouse leaves the control.
+ * @param {Function} props.onMouseOver        Called when mouse enters the control.
+ * @param {boolean}  props.showSideInLabel    Show side in control label.
+ * @param {Array}    props.sides              Available sides for control.
+ * @param {boolean}  props.useSelect          Use select control for predefined values.
+ * @param {Object}   props.values             Current spacing values.
+ * @return {Element}                         Spacing sizes control component.
+ */
 export default function SpacingSizesControl( {
 	inputProps,
 	label: labelProp,