Storybook: Add stories for BlockAlignmentControl and BlockAlignmentToolbar components

packages/block-editor/src/components/block-alignment-control/README.md

@@ -38,6 +38,20 @@ The current value of the alignment setting. You may only choose from the `Option
 
 A callback function invoked when the toolbar's alignment value is changed via an interaction with any of the toolbar's buttons. Called with the new alignment value (ie: `left`, `center`, `right`, `wide`, `full`) as the only argument.
 
+### `controls`
+
+-   **Type:** `Array`
+-   **Default:** [ `none`, `left`, `center`, `right`, `wide`, `full` ]
+
+An array of available alignment controls.
+
+### `isCollapsed`
+
+-   **Type:** `Boolean`
+-   **Default:** `true`
+
+Whether the toolbar should be collapsed. Default is true.
+
 ## Related components
 
 Block Editor components are components that can be used to compose the UI of your block editor. Thus, they can only be used under a [`BlockEditorProvider`](https://github.com/WordPress/gutenberg/blob/HEAD/packages/block-editor/src/components/provider/README.md) in the components tree.

packages/block-editor/src/components/block-alignment-control/stories/block-alignment-toolbar.story.js

@@ -0,0 +1,64 @@
+/**
+ * WordPress dependencies
+ */
+import { useState } from '@wordpress/element';
+
+/**
+ * Internal dependencies
+ */
+import { BlockAlignmentToolbar } from '../';
+
+export default {
+	title: 'BlockEditor/BlockAlignmentToolbar',
+	component: BlockAlignmentToolbar,
+	parameters: {
+		docs: {
+			canvas: { sourceState: 'shown' },
+			description: {
+				component:
+					'A control for selecting block alignment options in the toolbar. The different alignment options it provides are `left`, `center`, `right`, `wide` and `full`',
+			},
+		},
+	},
+	argTypes: {
+		value: {
+			control: { type: null },
+			description: 'The current value of the alignment setting.',
+		},
+		onChange: {
+			action: 'onChange',
+			control: { type: null },
+			description:
+				"A callback function invoked when the toolbar's alignment value is changed via an interaction with any of the toolbar's buttons. Called with the new alignment value (ie:`left`, `center`, `right`, `wide`, and `full`) as the only argument.",
+		},
+		controls: {
+			control: { type: null },
+			description: 'An array of available alignment controls.',
+		},
+		isCollapsed: {
+			control: 'boolean',
+			description: 'Whether the toolbar should be collapsed.',
+		},
+	},
+};
+
+export const Default = {
+	render: function Template( { onChange, ...args } ) {
+		const [ value, setValue ] = useState();
+		return (
+			<BlockAlignmentToolbar
+				{ ...args }
+				onChange={ ( ...changeArgs ) => {
+					onChange( ...changeArgs );
+					setValue( ...changeArgs );
+				} }
+				value={ value }
+			/>
+		);
+	},
+};
+
+Default.args = {
+	defaultValue: 'undefined',
+	panelId: 'panel-id',
+};

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

@@ -0,0 +1,54 @@
+/**
+ * WordPress dependencies
+ */
+import { useState } from '@wordpress/element';
+
+/**
+ * Internal dependencies
+ */
+import { BlockAlignmentControl } from '../';
+
+const meta = {
+	title: 'BlockEditor/BlockAlignmentControl',
+	component: BlockAlignmentControl,
+	parameters: {
+		docs: {
+			canvas: { sourceState: 'shown' },
+			description: {
+				component:
+					'A control for selecting block alignment options in the editor. The different alignment options it provides are `left`, `center`, `right`, `wide` and `full`',
+			},
+		},
+	},
+	argTypes: {
+		value: {
+			control: { type: null },
+			defaultValue: 'undefined',
+			description: 'The current value of the alignment setting.',
+		},
+		onChange: {
+			action: 'onChange',
+			control: { type: null },
+			description:
+				"A callback function invoked when the toolbar's alignment value is changed via an interaction with any of the toolbar's buttons. Called with the new alignment value (ie:`left`, `center`, `right`, `wide`, and `full`) as the only argument.",
+		},
+	},
+};
+
+export default meta;
+
+export const Default = {
+	render: function Template( { onChange, ...args } ) {
+		const [ value, setValue ] = useState();
+		return (
+			<BlockAlignmentControl
+				{ ...args }
+				onChange={ ( ...changeArgs ) => {
+					onChange( ...changeArgs );
+					setValue( ...changeArgs );
+				} }
+				value={ value }
+			/>
+		);
+	},
+};