Zoom Out: Only show the inserters when a block is selected or hovered

docs/reference-guides/data/data-core-block-editor.md

@@ -562,6 +562,18 @@ _Returns_
 
 -   `number`: Number of blocks in the post, or number of blocks with name equal to blockName.
 
+### getHoveredBlockClientId
+
+Returns the currently hovered block.
+
+_Parameters_
+
+-   _state_ `Object`: Global application state.
+
+_Returns_
+
+-   `Object`: Client Id of the hovered block.
+
 ### getInserterItems
 
 Determines the items that appear in the inserter. Includes both static items (e.g. a regular block type) and dynamic items (e.g. a reusable block).
@@ -1257,6 +1269,18 @@ _Parameters_
 
 Action that hides the insertion point.
 
+### hoverBlock
+
+Returns an action object used in signalling that the block with the specified client ID has been hovered.
+
+_Parameters_
+
+-   _clientId_ `string`: Block client ID.
+
+_Returns_
+
+-   `Object`: Action object.
+
 ### insertAfterBlock
 
 Action that inserts a default block after a given block.

packages/block-editor/src/components/block-list/use-block-props/index.js

@@ -115,7 +115,7 @@ export function useBlockProps( props = {}, { __unstableIsHtml } = {} ) {
 		useFocusHandler( clientId ),
 		useEventHandlers( { clientId, isSelected } ),
 		useNavModeExit( clientId ),
-		useIsHovered(),
+		useIsHovered( { clientId } ),
 		useIntersectionObserver(),
 		useMovingAnimation( { triggerAnimationOnChange: index, clientId } ),
 		useDisabled( { isDisabled: ! hasOverlay } ),

packages/block-editor/src/components/block-list/use-block-props/use-is-hovered.js

@@ -2,23 +2,37 @@
  * WordPress dependencies
  */
 import { useRefEffect } from '@wordpress/compose';
+import { useDispatch } from '@wordpress/data';
 
-function listener( event ) {
-	if ( event.defaultPrevented ) {
-		return;
-	}
-
-	const action = event.type === 'mouseover' ? 'add' : 'remove';
-
-	event.preventDefault();
-	event.currentTarget.classList[ action ]( 'is-hovered' );
-}
+/**
+ * Internal dependencies
+ */
+import { store as blockEditorStore } from '../../../store';
 
 /*
  * Adds `is-hovered` class when the block is hovered and in navigation or
  * outline mode.
  */
-export function useIsHovered() {
+export function useIsHovered( { clientId } ) {
+	const { hoverBlock } = useDispatch( blockEditorStore );
+
+	function listener( event ) {
+		if ( event.defaultPrevented ) {
+			return;
+		}
+
+		const action = event.type === 'mouseover' ? 'add' : 'remove';
+
+		event.preventDefault();
+		event.currentTarget.classList[ action ]( 'is-hovered' );
+
+		if ( action === 'add' ) {
+			hoverBlock( clientId );
+		} else {
+			hoverBlock( null );
+		}
+	}
+
 	return useRefEffect( ( node ) => {
 		node.addEventListener( 'mouseout', listener );
 		node.addEventListener( 'mouseover', listener );
@@ -29,6 +43,7 @@ export function useIsHovered() {
 
 			// Remove class in case it lingers.
 			node.classList.remove( 'is-hovered' );
+			hoverBlock( null );
 		};
 	}, [] );
 }

packages/block-editor/src/components/block-tools/style.scss

@@ -285,3 +285,11 @@
 		border: none;
 	}
 }
+
+.block-editor-block-tools__zoom-out-mode-inserter-button {
+	visibility: hidden;
+
+	&.is-visible {
+		visibility: visible;
+	}
+}

packages/block-editor/src/components/block-tools/zoom-out-mode-inserter-button.js

@@ -0,0 +1,47 @@
+/**
+ * External dependencies
+ */
+import clsx from 'clsx';
+
+/**
+ * WordPress dependencies
+ */
+import { useState } from '@wordpress/element';
+import { Button } from '@wordpress/components';
+import { plus } from '@wordpress/icons';
+import { _x } from '@wordpress/i18n';
+
+function ZoomOutModeInserterButton( { isVisible, onClick } ) {
+	const [
+		zoomOutModeInserterButtonHovered,
+		setZoomOutModeInserterButtonHovered,
+	] = useState( false );
+
+	return (
+		<Button
+			variant="primary"
+			icon={ plus }
+			size="compact"
+			className={ clsx(
+				'block-editor-button-pattern-inserter__button',
+				'block-editor-block-tools__zoom-out-mode-inserter-button',
+				{
+					'is-visible': isVisible || zoomOutModeInserterButtonHovered,
+				}
+			) }
+			onClick={ onClick }
+			onMouseOver={ () => {
+				setZoomOutModeInserterButtonHovered( true );
+			} }
+			onMouseOut={ () => {
+				setZoomOutModeInserterButtonHovered( false );
+			} }
+			label={ _x(
+				'Add pattern',
+				'Generic label for pattern inserter button'
+			) }
+		/>
+	);
+}
+
+export default ZoomOutModeInserterButton;

packages/block-editor/src/components/block-tools/zoom-out-mode-inserters.js

@@ -3,28 +3,33 @@
  */
 import { useSelect } from '@wordpress/data';
 import { useEffect, useRef, useState } from '@wordpress/element';
-import { Button } from '@wordpress/components';
-import { plus } from '@wordpress/icons';
-import { _x } from '@wordpress/i18n';
 
 /**
  * Internal dependencies
  */
 import BlockPopoverInbetween from '../block-popover/inbetween';
+import ZoomOutModeInserterButton from './zoom-out-mode-inserter-button';
 import { store as blockEditorStore } from '../../store';
 import { unlock } from '../../lock-unlock';
 
 function ZoomOutModeInserters() {
 	const [ isReady, setIsReady ] = useState( false );
 	const {
+		hasSelection,
 		blockOrder,
-		sectionRootClientId,
 		insertionPoint,
 		setInserterIsOpened,
-		hasSelection,
+		sectionRootClientId,
+		selectedBlockClientId,
+		hoveredBlockClientId,
 	} = useSelect( ( select ) => {
-		const { getSettings, getBlockOrder, getSelectionStart } =
-			select( blockEditorStore );
+		const {
+			getSettings,
+			getBlockOrder,
+			getSelectionStart,
+			getSelectedBlockClientId,
+			getHoveredBlockClientId,
+		} = select( blockEditorStore );
 		const { sectionRootClientId: root } = unlock( getSettings() );
 		// To do: move ZoomOutModeInserters to core/editor.
 		// Or we perhaps we should move the insertion point state to the
@@ -40,6 +45,8 @@ function ZoomOutModeInserters() {
 			sectionRootClientId: root,
 			setInserterIsOpened:
 				getSettings().__experimentalSetIsInserterOpened,
+			selectedBlockClientId: getSelectedBlockClientId(),
+			hoveredBlockClientId: getHoveredBlockClientId(),
 		};
 	}, [] );
 
@@ -64,18 +71,39 @@ function ZoomOutModeInserters() {
 		};
 	}, [] );
 
-	if ( ! isReady || ! hasSelection ) {
+	if ( ! isReady ) {
 		return null;
 	}
 
 	return [ undefined, ...blockOrder ].map( ( clientId, index ) => {
+		const shouldRenderInserter = insertionPoint.insertionIndex !== index;
+
+		const shouldRenderInsertionPoint =
+			insertionPoint.insertionIndex === index;
+
+		if ( ! shouldRenderInserter && ! shouldRenderInsertionPoint ) {
+			return null;
+		}
+
+		const previousClientId = clientId;
+		const nextClientId = blockOrder[ index ];
+
+		const isSelected =
+			hasSelection &&
+			( selectedBlockClientId === previousClientId ||
+				selectedBlockClientId === nextClientId );
+
+		const isHovered =
+			hoveredBlockClientId === previousClientId ||
+			hoveredBlockClientId === nextClientId;
+
 		return (
 			<BlockPopoverInbetween
 				key={ index }
-				previousClientId={ clientId }
-				nextClientId={ blockOrder[ index ] }
+				previousClientId={ previousClientId }
+				nextClientId={ nextClientId }
 			>
-				{ insertionPoint.insertionIndex === index && (
+				{ shouldRenderInsertionPoint && (
 					<div
 						style={ {
 							borderRadius: '0',
@@ -87,12 +115,9 @@ function ZoomOutModeInserters() {
 						className="block-editor-block-list__insertion-point-indicator"
 					/>
 				) }
-				{ insertionPoint.insertionIndex !== index && (
-					<Button
-						variant="primary"
-						icon={ plus }
-						size="compact"
-						className="block-editor-button-pattern-inserter__button"
+				{ shouldRenderInserter && (
+					<ZoomOutModeInserterButton
+						isVisible={ isSelected || isHovered }
 						onClick={ () => {
 							setInserterIsOpened( {
 								rootClientId: sectionRootClientId,
@@ -101,10 +126,6 @@ function ZoomOutModeInserters() {
 								category: 'all',
 							} );
 						} }
-						label={ _x(
-							'Add pattern',
-							'Generic label for pattern inserter button'
-						) }
 					/>
 				) }
 			</BlockPopoverInbetween>

packages/block-editor/src/store/actions.js

@@ -213,6 +213,21 @@ export function selectBlock( clientId, initialPosition = 0 ) {
 	};
 }
 
+/**
+ * Returns an action object used in signalling that the block with the
+ * specified client ID has been hovered.
+ *
+ * @param {string} clientId Block client ID.
+ *
+ * @return {Object} Action object.
+ */
+export function hoverBlock( clientId ) {
+	return {
+		type: 'HOVER_BLOCK',
+		clientId,
+	};
+}
+
 /**
  * Yields action objects used in signalling that the block preceding the given
  * clientId (or optionally, its first parent from bottom to top)

packages/block-editor/src/store/reducer.js

@@ -2068,6 +2068,23 @@ export function lastFocus( state = false, action ) {
 	return state;
 }
 
+/**
+ * Reducer setting currently hovered block.
+ *
+ * @param {boolean} state  Current state.
+ * @param {Object}  action Dispatched action.
+ *
+ * @return {boolean} Updated state.
+ */
+export function hoveredBlockClientId( state = false, action ) {
+	switch ( action.type ) {
+		case 'HOVER_BLOCK':
+			return action.clientId;
+	}
+
+	return state;
+}
+
 const combinedReducers = combineReducers( {
 	blocks,
 	isDragging,
@@ -2100,6 +2117,7 @@ const combinedReducers = combineReducers( {
 	blockRemovalRules,
 	openedBlockSettingsMenu,
 	registeredInserterMediaCategories,
+	hoveredBlockClientId,
 } );
 
 function withAutomaticChangeReset( reducer ) {

packages/block-editor/src/store/selectors.js

@@ -2809,6 +2809,16 @@ export function isBlockVisible( state, clientId ) {
 	return state.blockVisibility?.[ clientId ] ?? true;
 }
 
+/**
+ * Returns the currently hovered block.
+ *
+ * @param {Object} state Global application state.
+ * @return {Object} Client Id of the hovered block.
+ */
+export function getHoveredBlockClientId( state ) {
+	return state.hoveredBlockClientId;
+}
+
 /**
  * Returns the list of all hidden blocks.
  *