Add TabPanel to document overview replacing fake tabs (#50199)

* Add TabPanel to document overview sidebar. * TabPanel: Changed to support ref forwarding. Added prop for attaching parent refs to wrapping content div. * Reviewer feedback addressed. * Fix E2E tests. * Update styles to more closely reflect the look of the tabs in trunk * Restore scrollbar behaviour * Add changelog entry for components package * Better comments. * Fix E2E. * Add back useState for cleaner code. * Fix list view prop. Changelog update. * Fix tab panel focus. Still need to use focus.tabbable.find(). * Fix changelog format. --------- Co-authored-by: Andrew Serong <14988353+andrewserong@users.noreply.github.com>
WordPress · May 30, 2023 · 43f6e60 · 43f6e60
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diff --git a/packages/components/CHANGELOG.md b/packages/components/CHANGELOG.md
@@ -10,11 +10,14 @@
 
 -   `FocalPointUnitControl`: Add aria-labels ([#50993](https://github.com/WordPress/gutenberg/pull/50993)).
 
+### Enhancements
+
+-   Wrapped `TabPanel` in a `forwardRef` call ([#50199](https://github.com/WordPress/gutenberg/pull/50199)).
+
 ### Experimental
 
 -   `DropdownMenu` v2: Tweak styles ([#50967](https://github.com/WordPress/gutenberg/pull/50967)).
 
-
 ## 25.0.0 (2023-05-24)
 
 ### Breaking Changes

diff --git a/packages/components/src/tab-panel/index.tsx b/packages/components/src/tab-panel/index.tsx
@@ -2,11 +2,13 @@
  * External dependencies
  */
 import classnames from 'classnames';
+import type { ForwardedRef } from 'react';
 
 /**
  * WordPress dependencies
  */
 import {
+	forwardRef,
 	useState,
 	useEffect,
 	useLayoutEffect,
@@ -76,16 +78,19 @@ const TabButton = ( {
  * );
  * ```
  */
-export function TabPanel( {
-	className,
-	children,
-	tabs,
-	selectOnMove = true,
-	initialTabName,
-	orientation = 'horizontal',
-	activeClass = 'is-active',
-	onSelect,
-}: WordPressComponentProps< TabPanelProps, 'div', false > ) {
+const UnforwardedTabPanel = (
+	{
+		className,
+		children,
+		tabs,
+		selectOnMove = true,
+		initialTabName,
+		orientation = 'horizontal',
+		activeClass = 'is-active',
+		onSelect,
+	}: WordPressComponentProps< TabPanelProps, 'div', false >,
+	ref: ForwardedRef< any >
+) => {
 	const instanceId = useInstanceId( TabPanel, 'tab-panel' );
 	const [ selected, setSelected ] = useState< string >();
 
@@ -151,7 +156,7 @@ export function TabPanel( {
 	}, [ tabs, selectedTab?.disabled, handleTabSelection ] );
 
 	return (
-		<div className={ className }>
+		<div className={ className } ref={ ref }>
 			<NavigableMenu
 				role="tablist"
 				orientation={ orientation }
@@ -196,6 +201,7 @@ export function TabPanel( {
 			) }
 		</div>
 	);
-}
+};
 
+export const TabPanel = forwardRef( UnforwardedTabPanel );
 export default TabPanel;
diff --git a/packages/e2e-tests/specs/editor/various/block-hierarchy-navigation.test.js b/packages/e2e-tests/specs/editor/various/block-hierarchy-navigation.test.js
@@ -141,7 +141,7 @@ describe( 'Navigating the block hierarchy', () => {
 		// Navigate to the third column in the columns block.
 		await pressKeyWithModifier( 'ctrlShift', '`' );
 		await pressKeyWithModifier( 'ctrlShift', '`' );
-		await pressKeyTimes( 'Tab', 4 );
+		await pressKeyTimes( 'Tab', 3 );
 		await pressKeyTimes( 'ArrowDown', 4 );
 		await page.waitForSelector(
 			'.is-highlighted[aria-label="Block: Column (3 of 3)"]'

diff --git a/packages/edit-post/src/components/secondary-sidebar/list-view-sidebar.js b/packages/edit-post/src/components/secondary-sidebar/list-view-sidebar.js
@@ -1,13 +1,8 @@
-/**
- * External dependencies
- */
-import classnames from 'classnames';
-
 /**
  * WordPress dependencies
  */
 import { __experimentalListView as ListView } from '@wordpress/block-editor';
-import { Button } from '@wordpress/components';
+import { Button, TabPanel } from '@wordpress/components';
 import {
 	useFocusOnMount,
 	useFocusReturn,
@@ -30,7 +25,9 @@ import ListViewOutline from './list-view-outline';
 export default function ListViewSidebar() {
 	const { setIsListViewOpened } = useDispatch( editPostStore );
 
+	// This hook handles focus when the sidebar first renders.
 	const focusOnMountRef = useFocusOnMount( 'firstElement' );
+	// The next 2 hooks handle focus for when the sidebar closes and returning focus to the element that had focus before sidebar opened.
 	const headerFocusReturnRef = useFocusReturn();
 	const contentFocusReturnRef = useFocusReturn();
 
@@ -44,18 +41,24 @@ export default function ListViewSidebar() {
 	// Use internal state instead of a ref to make sure that the component
 	// re-renders when the dropZoneElement updates.
 	const [ dropZoneElement, setDropZoneElement ] = useState( null );
-
+	// Tracks our current tab.
 	const [ tab, setTab ] = useState( 'list-view' );
 
 	// This ref refers to the sidebar as a whole.
 	const sidebarRef = useRef();
-	// This ref refers to the list view tab button.
-	const listViewTabRef = useRef();
-	// This ref refers to the outline tab button.
-	const outlineTabRef = useRef();
+	// This ref refers to the tab panel.
+	const tabPanelRef = useRef();
 	// This ref refers to the list view application area.
 	const listViewRef = useRef();
 
+	// Must merge the refs together so focus can be handled properly in the next function.
+	const listViewContainerRef = useMergeRefs( [
+		contentFocusReturnRef,
+		focusOnMountRef,
+		listViewRef,
+		setDropZoneElement,
+	] );
+
 	/*
 	 * Callback function to handle list view or outline focus.
 	 *
@@ -64,21 +67,23 @@ export default function ListViewSidebar() {
 	 * @return void
 	 */
 	function handleSidebarFocus( currentTab ) {
+		// Tab panel focus.
+		const tabPanelFocus = focus.tabbable.find( tabPanelRef.current )[ 0 ];
 		// List view tab is selected.
 		if ( currentTab === 'list-view' ) {
-			// Either focus the list view or the list view tab button. Must have a fallback because the list view does not render when there are no blocks.
+			// Either focus the list view or the tab panel. Must have a fallback because the list view does not render when there are no blocks.
 			const listViewApplicationFocus = focus.tabbable.find(
 				listViewRef.current
 			)[ 0 ];
 			const listViewFocusArea = sidebarRef.current.contains(
 				listViewApplicationFocus
 			)
 				? listViewApplicationFocus
-				: listViewTabRef.current;
+				: tabPanelFocus;
 			listViewFocusArea.focus();
 			// Outline tab is selected.
 		} else {
-			outlineTabRef.current.focus();
+			tabPanelFocus.focus();
 		}
 	}
 
@@ -97,71 +102,63 @@ export default function ListViewSidebar() {
 		}
 	} );
 
+	/**
+	 * Render tab content for a given tab name.
+	 *
+	 * @param {string} tabName The name of the tab to render.
+	 */
+	function renderTabContent( tabName ) {
+		if ( tabName === 'list-view' ) {
+			return (
+				<div className="edit-post-editor__list-view-panel-content">
+					<ListView dropZoneElement={ dropZoneElement } />
+				</div>
+			);
+		}
+		return <ListViewOutline />;
+	}
+
 	return (
 		// eslint-disable-next-line jsx-a11y/no-static-element-interactions
 		<div
 			className="edit-post-editor__document-overview-panel"
 			onKeyDown={ closeOnEscape }
 			ref={ sidebarRef }
 		>
-			<div
-				className="edit-post-editor__document-overview-panel-header components-panel__header edit-post-sidebar__panel-tabs"
+			<Button
+				className="edit-post-editor__document-overview-panel__close-button"
 				ref={ headerFocusReturnRef }
+				icon={ closeSmall }
+				label={ __( 'Close' ) }
+				onClick={ () => setIsListViewOpened( false ) }
+			/>
+			<TabPanel
+				className="edit-post-editor__document-overview-panel__tab-panel"
+				ref={ tabPanelRef }
+				onSelect={ ( tabName ) => setTab( tabName ) }
+				selectOnMove={ false }
+				tabs={ [
+					{
+						name: 'list-view',
+						title: 'List View',
+						className: 'edit-post-sidebar__panel-tab',
+					},
+					{
+						name: 'outline',
+						title: 'Outline',
+						className: 'edit-post-sidebar__panel-tab',
+					},
+				] }
 			>
-				<Button
-					icon={ closeSmall }
-					label={ __( 'Close' ) }
-					onClick={ () => setIsListViewOpened( false ) }
-				/>
-				<ul>
-					<li>
-						<Button
-							ref={ listViewTabRef }
-							onClick={ () => {
-								setTab( 'list-view' );
-							} }
-							className={ classnames(
-								'edit-post-sidebar__panel-tab',
-								{ 'is-active': tab === 'list-view' }
-							) }
-							aria-current={ tab === 'list-view' }
-						>
-							{ __( 'List View' ) }
-						</Button>
-					</li>
-					<li>
-						<Button
-							ref={ outlineTabRef }
-							onClick={ () => {
-								setTab( 'outline' );
-							} }
-							className={ classnames(
-								'edit-post-sidebar__panel-tab',
-								{ 'is-active': tab === 'outline' }
-							) }
-							aria-current={ tab === 'outline' }
-						>
-							{ __( 'Outline' ) }
-						</Button>
-					</li>
-				</ul>
-			</div>
-			<div
-				ref={ useMergeRefs( [
-					contentFocusReturnRef,
-					focusOnMountRef,
-					listViewRef,
-					setDropZoneElement,
-				] ) }
-				className="edit-post-editor__list-view-container"
-			>
-				{ tab === 'list-view' && (
-					<div className="edit-post-editor__list-view-panel-content">
-						<ListView dropZoneElement={ dropZoneElement } />
+				{ ( currentTab ) => (
+					<div
+						className="edit-post-editor__list-view-container"
+						ref={ listViewContainerRef }
+					>
+						{ renderTabContent( currentTab.name ) }
 					</div>
 				) }
-				{ tab === 'outline' && <ListViewOutline /> }
-			</div>
+			</TabPanel>
 		</div>
 	);
 }
diff --git a/packages/edit-post/src/components/secondary-sidebar/style.scss b/packages/edit-post/src/components/secondary-sidebar/style.scss
@@ -17,8 +17,29 @@
 		width: 350px;
 	}
 
-	.edit-post-sidebar__panel-tabs {
-		flex-direction: row-reverse;
+	.edit-post-editor__document-overview-panel__close-button {
+		position: absolute;
+		right: $grid-unit-10;
+		top: math.div($grid-unit-60 - $button-size, 2); // ( tab height - button size ) / 2
+		z-index: 1;
+		background: $white;
+	}
+
+	// The TabPanel style overrides in the following blocks should be removed when the new TabPanel is available.
+	.components-tab-panel__tabs {
+		border-bottom: $border-width solid $gray-300;
+		box-sizing: border-box;
+		display: flex;
+		width: 100%;
+		padding-right: $grid-unit-70;
+
+		.edit-post-sidebar__panel-tab {
+			width: 50%;
+		}
+	}
+
+	.components-tab-panel__tab-content {
+		height: calc(100% - #{$grid-unit-60});
 	}
 }
 
@@ -37,34 +58,6 @@
 	}
 }
 
-.edit-post-editor__document-overview-panel-header {
-	border-bottom: $border-width solid $gray-300;
-	display: flex;
-	justify-content: space-between;
-	height: $grid-unit-60;
-	padding-left: $grid-unit-20;
-	padding-right: $grid-unit-05;
-	ul {
-		width: calc(100% - #{ $grid-unit-50 });
-	}
-	li {
-		width: 50%;
-		button {
-			width: 100%;
-			text-align: initial;
-		}
-	}
-	li:only-child {
-		width: 100%;
-	}
-
-	&.components-panel__header.edit-post-sidebar__panel-tabs {
-		.components-button.has-icon {
-			display: flex;
-		}
-	}
-}
-
 .edit-post-editor__list-view-panel-content,
 .edit-post-editor__list-view-container > .document-outline,
 .edit-post-editor__list-view-empty-headings {
@@ -118,5 +111,9 @@
 .edit-post-editor__list-view-container {
 	display: flex;
 	flex-direction: column;
-	height: calc(100% - #{$grid-unit-60});
+	height: 100%;
+}
+
+.edit-post-editor__document-overview-panel__tab-panel {
+	height: 100%;
 }
diff --git a/test/e2e/specs/editor/various/list-view.spec.js b/test/e2e/specs/editor/various/list-view.spec.js
@@ -331,9 +331,8 @@ test.describe( 'List View', () => {
 
 		// Focus the list view close button and make sure the shortcut will
 		// close the list view. This is to catch a bug where elements could be
-		// out of range of the sidebar region. Must shift+tab 3 times to reach
-		// close button before tabs.
-		await pageUtils.pressKeys( 'shift+Tab' );
+		// out of range of the sidebar region. Must shift+tab 2 times to reach
+		// close button before tab panel.
 		await pageUtils.pressKeys( 'shift+Tab' );
 		await pageUtils.pressKeys( 'shift+Tab' );
 		await expect(
@@ -354,7 +353,8 @@ test.describe( 'List View', () => {
 		// Focus the outline tab and select it. This test ensures the outline
 		// tab receives similar focus events based on the shortcut.
 		await pageUtils.pressKeys( 'shift+Tab' );
-		const outlineButton = editor.canvas.getByRole( 'button', {
+		await page.keyboard.press( 'ArrowRight' );
+		const outlineButton = editor.canvas.getByRole( 'tab', {
 			name: 'Outline',
 		} );
 		await expect( outlineButton ).toBeFocused();