Components: Add hooks based Scrollable component wrapper (#28979)

* Components: Add hooks based Scrollable component wrapper

* Add README for Scrollable

* Update example doc for scrollable/component.js and README

Co-authored-by: Jon Q <hello@jonquach.com>

packages/components/src/ui/scrollable/README.md

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+# Scrollable
+
+`Scrollable` is a layout component that content in a scrollable container.
+
+## Usage
+
+```jsx
+import { Scrollable, View } from '@wordpress/components/ui';
+
+function Example() {
+	return (
+		<Scrollable style={ { maxHeight: 200 } }>
+			<View style={ { height: 500 } }>...</View>
+		</Scrollable>
+	);
+}
+```
+
+## Props
+
+##### scrollDirection
+
+**Type**: `x` | `y` | `auto`
+
+Renders a scrollbar for a specific axis when content overflows.
+
+##### smoothScroll
+
+**Type**: `boolean`
+
+Enables (CSS) smooth scrolling.

packages/components/src/ui/scrollable/component.js

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+/**
+ * Internal dependencies
+ */
+import { createComponent } from '../utils';
+import { useScrollable } from './hook';
+
+/**
+ * `Scrollable` is a layout component that content in a scrollable container.
+ *
+ * @example
+ * ```jsx
+ * import { Scrollable, View } from `@wordpress/components/ui`;
+ 
+ * function Example() {
+ * 	return (
+ * 		<Scrollable style={ { maxHeight: 200 } }>
+ * 			<View style={ { height: 500 } }>...</View>
+ * 		</Scrollable>
+ * 	);
+ * }
+ * ```
+ */
+
+const Scrollable = createComponent( {
+	as: 'div',
+	useHook: useScrollable,
+	name: 'Scrollable',
+} );
+
+export default Scrollable;

packages/components/src/ui/scrollable/hook.js

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+/**
+ * External dependencies
+ */
+import { useContextSystem } from '@wp-g2/context';
+import { cx } from '@wp-g2/styles';
+
+/**
+ * WordPress dependencies
+ */
+import { useMemo } from '@wordpress/element';
+
+/**
+ * Internal dependencies
+ */
+import * as styles from './styles';
+
+/* eslint-disable jsdoc/valid-types */
+/**
+ * @param  {import('@wp-g2/create-styles').ViewOwnProps<import('./types').Props, 'div'>} props
+ */
+/* eslint-enable jsdoc/valid-types */
+export function useScrollable( props ) {
+	const {
+		className,
+		scrollDirection = 'y',
+		smoothScroll = false,
+		...otherProps
+	} = useContextSystem( props, 'Scrollable' );
+
+	const classes = useMemo(
+		() =>
+			cx(
+				styles.Scrollable,
+				styles.scrollableScrollbar,
+				smoothScroll && styles.smoothScroll,
+				scrollDirection === 'x' && styles.scrollX,
+				scrollDirection === 'y' && styles.scrollY,
+				scrollDirection === 'auto' && styles.scrollAuto,
+				className
+			),
+		[ className, scrollDirection, smoothScroll ]
+	);
+
+	return { ...otherProps, className: classes };
+}

packages/components/src/ui/scrollable/index.js

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+export { default as Scrollable } from './component';
+
+export * from './hook';

packages/components/src/ui/scrollable/stories/index.js

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+/**
+ * Internal dependencies
+ */
+import { View } from '../../index';
+import { Scrollable } from '../index';
+
+export default {
+	component: Scrollable,
+	title: 'G2 Components (Experimental)/Scrollable',
+};
+
+export const _default = () => {
+	return (
+		<Scrollable css={ { height: 400, width: 300 } }>
+			<View css={ { backgroundColor: '#eee', height: 1000 } } />
+		</Scrollable>
+	);
+};

packages/components/src/ui/scrollable/styles.js

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+/**
+ * External dependencies
+ */
+import { css, ui } from '@wp-g2/styles';
+
+export const scrollableScrollbar = css`
+	@media only screen and ( min-device-width: 40em ) {
+		&::-webkit-scrollbar {
+			height: 12px;
+			width: 12px;
+		}
+
+		&::-webkit-scrollbar-track {
+			background-color: transparent;
+		}
+
+		&::-webkit-scrollbar-track {
+			background: ${ ui.get( 'colorScrollbarTrack' ) };
+			border-radius: 8px;
+		}
+
+		&::-webkit-scrollbar-thumb {
+			background-clip: padding-box;
+			background-color: ${ ui.get( 'colorScrollbarThumb' ) };
+			border: 2px solid rgba( 0, 0, 0, 0 );
+			border-radius: 7px;
+		}
+
+		&:hover::-webkit-scrollbar-thumb {
+			background-color: ${ ui.get( 'colorScrollbarThumbHover' ) };
+		}
+	}
+`;
+
+export const Scrollable = css`
+	height: 100%;
+`;
+
+export const Content = css`
+	position: relative;
+`;
+
+export const smoothScroll = css`
+	scroll-behavior: smooth;
+`;
+
+export const scrollX = css`
+	overflow-x: auto;
+	overflow-y: hidden;
+`;
+
+export const scrollY = css`
+	overflow-x: hidden;
+	overflow-y: auto;
+`;
+
+export const scrollAuto = css`
+	overflow-y: auto;
+`;

packages/components/src/ui/scrollable/test/__snapshots__/index.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`props should render correctly 1`] = `
+.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0 {
+  box-sizing: border-box;
+  -moz-osx-font-smoothing: grayscale;
+  -webkit-font-smoothing: antialiased;
+  font-family: Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",sans-serif;
+  font-family: var(--wp-g2-font-family);
+  font-size: 13px;
+  font-size: var(--wp-g2-font-size);
+  font-weight: normal;
+  font-weight: var(--wp-g2-font-weight);
+  margin: 0;
+  height: 100%;
+  overflow-x: hidden;
+  overflow-y: auto;
+}
+
+@media (prefers-reduced-motion) {
+  .emotion-0.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0 {
+    -webkit-transition: none !important;
+    transition: none !important;
+  }
+}
+
+[data-system-ui-reduced-motion-mode="true"] .emotion-0.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0 {
+  -webkit-transition: none !important;
+  transition: none !important;
+}
+
+@media only screen and ( min-device-width:40em ) {
+  .emotion-0.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0::-webkit-scrollbar {
+    height: 12px;
+    width: 12px;
+  }
+
+  .emotion-0.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0::-webkit-scrollbar-track {
+    background-color: transparent;
+  }
+
+  .emotion-0.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0::-webkit-scrollbar-track {
+    background: rgba(0, 0, 0, 0.04);
+    background: var(--wp-g2-color-scrollbar-track);
+    border-radius: 8px;
+  }
+
+  .emotion-0.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0::-webkit-scrollbar-thumb {
+    background-clip: padding-box;
+    background-color: rgba(0, 0, 0, 0.2);
+    background-color: var(--wp-g2-color-scrollbar-thumb);
+    border: 2px solid rgba( 0,0,0,0 );
+    border-radius: 7px;
+  }
+
+  .emotion-0.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0.emotion-0:hover::-webkit-scrollbar-thumb {
+    background-color: rgba(0, 0, 0, 0.5);
+    background-color: var(--wp-g2-color-scrollbar-thumb-hover);
+  }
+}
+
+<div
+  class="components-scrollable wp-components-scrollable emotion-0"
+  data-g2-c16t="true"
+  data-g2-component="Scrollable"
+>
+  WordPress.org - Code is Poetry
+</div>
+`;
+
+exports[`props should render smoothScroll 1`] = `
+"Snapshot Diff:
+- First value
++ Second value
+
+- Snapshot Diff:
+- - First value
+- + Second value
+-
+- @@ -7,10 +7,9 @@
+-   	\\"margin-top\\": \\"0px\\",
+-   	\\"margin-right\\": \\"0px\\",
+-   	\\"margin-bottom\\": \\"0px\\",
+-   	\\"margin-left\\": \\"0px\\",
+-   	\\"height\\": \\"100%\\",
+- - 	\\"scroll-behavior\\": \\"smooth\\",
+-   	\\"overflow-x\\": \\"hidden\\",
+-   	\\"overflow-y\\": \\"auto\\",
+-   	\\"visibility\\": \\"visible\\"
+-   }"
+`;

packages/components/src/ui/scrollable/test/index.js

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+/**
+ * External dependencies
+ */
+import { render } from '@testing-library/react';
+
+/**
+ * Internal dependencies
+ */
+import { Scrollable } from '../index';
+
+describe( 'props', () => {
+	let base;
+
+	beforeEach( () => {
+		( { container: base } = render(
+			<Scrollable>WordPress.org - Code is Poetry</Scrollable>
+		) );
+	} );
+	test( 'should render correctly', () => {
+		expect( base.firstChild ).toMatchSnapshot();
+	} );
+
+	test( 'should render smoothScroll', () => {
+		const { container } = render(
+			<Scrollable smoothScroll>WordPress.org - Code is Poetry</Scrollable>
+		);
+		expect( container.firstChild ).toMatchStyleDiffSnapshot(
+			base.firstChild
+		);
+	} );
+} );

packages/components/src/ui/scrollable/types.ts

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+export type ScrollableDirection = 'x' | 'y' | 'auto';
+
+export type Props = {
+	/**
+	 * Renders a scrollbar for a specific axis when content overflows.
+	 *
+	 * @default 'y'
+	 */
+	scrollDirection?: ScrollableDirection;
+	/**
+	 * Enables (CSS) smooth scrolling.
+	 *
+	 * @default false
+	 */
+	smoothScroll?: boolean;
+};