Block editor: try direct drag (outside text editable)

packages/block-editor/src/components/block-draggable/content.scss

@@ -1,13 +1,12 @@
 // This creates a "slot" where the block you're dragging appeared.
 // We use !important as one of the rules are meant to be overridden.
 .block-editor-block-list__layout .is-dragging {
-	background-color: currentColor !important;
-	opacity: 0.05 !important;
+	opacity: 0.1 !important;
 	border-radius: $radius-small !important;
 
-	// Disabling pointer events during the drag event is necessary,
-	// lest the block might affect your drag operation.
-	pointer-events: none !important;
+	iframe {
+		pointer-events: none;
+	}
 
 	// Hide the multi selection indicator when dragging.
 	&::selection {
@@ -18,3 +17,10 @@
 		content: none !important;
 	}
 }
+
+// Images are draggable by default, so disable drag for them if not explicitly
+// set. This is done so that the block can capture the drag event instead.
+.wp-block img:not([draggable]),
+.wp-block svg:not([draggable]) {
+	pointer-events: none;
+}

packages/block-editor/src/components/block-list/block.js

@@ -797,6 +797,7 @@ function BlockListBlockProvider( props ) {
 		mayDisplayParentControls,
 		originalBlockClientId,
 		themeSupportsLayout,
+		canMove,
 	};
 
 	// Here we separate between the props passed to BlockListBlock and any other

packages/block-editor/src/components/block-list/content.scss

@@ -427,3 +427,9 @@ _::-webkit-full-page-media, _:future, :root [data-has-multi-selection="true"] .b
 	// Additional -1px is required to avoid sub pixel rounding errors allowing background to show.
 	margin: 0 calc(-1 * var(--wp--style--root--padding-right) - 1px) 0 calc(-1 * var(--wp--style--root--padding-left) - 1px) !important;
 }
+
+// This only works in Firefox, Chrome and Safari don't accept a custom cursor
+// during drag.
+.is-dragging {
+	cursor: grabbing;
+}

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

@@ -30,6 +30,7 @@ import { useIntersectionObserver } from './use-intersection-observer';
 import { useScrollIntoView } from './use-scroll-into-view';
 import { useFlashEditableBlocks } from '../../use-flash-editable-blocks';
 import { canBindBlock } from '../../../hooks/use-bindings-attributes';
+import { useFirefoxDraggableCompatibility } from './use-firefox-draggable-compatibility';
 
 /**
  * This hook is used to lightly mark an element as a block element. The element
@@ -100,11 +101,15 @@ export function useBlockProps( props = {}, { __unstableIsHtml } = {} ) {
 		isTemporarilyEditingAsBlocks,
 		defaultClassName,
 		isSectionBlock,
+		canMove,
 	} = useContext( PrivateBlockContext );
 
+	const canDrag = canMove && ! hasChildSelected;
+
 	// translators: %s: Type of block (i.e. Text, Image etc)
 	const blockLabel = sprintf( __( 'Block: %s' ), blockTitle );
 	const htmlSuffix = mode === 'html' && ! __unstableIsHtml ? '-visual' : '';
+	const ffDragRef = useFirefoxDraggableCompatibility();
 	const mergedRefs = useMergeRefs( [
 		props.ref,
 		useFocusFirstElement( { clientId, initialPosition } ),
@@ -120,6 +125,7 @@ export function useBlockProps( props = {}, { __unstableIsHtml } = {} ) {
 			isEnabled: isSectionBlock,
 		} ),
 		useScrollIntoView( { isSelected } ),
+		canDrag ? ffDragRef : undefined,
 	] );
 
 	const blockEditContext = useBlockEditContext();
@@ -152,6 +158,7 @@ export function useBlockProps( props = {}, { __unstableIsHtml } = {} ) {
 
 	return {
 		tabIndex: blockEditingMode === 'disabled' ? -1 : 0,
+		draggable: canDrag ? true : undefined,
 		...wrapperProps,
 		...props,
 		ref: mergedRefs,

packages/block-editor/src/components/block-list/use-block-props/use-firefox-draggable-compatibility.js

@@ -0,0 +1,25 @@
+/**
+ * WordPress dependencies
+ */
+import { useRefEffect } from '@wordpress/compose';
+
+/**
+ * In Firefox, the `draggable` and `contenteditable` attributes don't play well
+ * together. When `contenteditable` is within a `draggable` element, selection
+ * doesn't get set in the right place. The only solution is to temporarily
+ * remove the `draggable` attribute clicking inside `contenteditable` elements.
+ *
+ * @return {Function} Cleanup function.
+ */
+export function useFirefoxDraggableCompatibility() {
+	return useRefEffect( ( node ) => {
+		function onDown( event ) {
+			node.draggable = ! event.target.isContentEditable;
+		}
+		const { ownerDocument } = node;
+		ownerDocument.addEventListener( 'pointerdown', onDown );
+		return () => {
+			ownerDocument.removeEventListener( 'pointerdown', onDown );
+		};
+	}, [] );
+}

packages/block-editor/src/components/block-list/use-block-props/use-selected-block-event-handlers.js

@@ -5,12 +5,15 @@ import { isTextField } from '@wordpress/dom';
 import { ENTER, BACKSPACE, DELETE } from '@wordpress/keycodes';
 import { useSelect, useDispatch } from '@wordpress/data';
 import { useRefEffect } from '@wordpress/compose';
+import { createRoot } from '@wordpress/element';
+import { store as blocksStore } from '@wordpress/blocks';
 
 /**
  * Internal dependencies
  */
 import { store as blockEditorStore } from '../../../store';
 import { unlock } from '../../../lock-unlock';
+import BlockDraggableChip from '../../../components/block-draggable/draggable-chip';
 
 /**
  * Adds block behaviour:
@@ -21,12 +24,16 @@ import { unlock } from '../../../lock-unlock';
  * @param {string} clientId Block client ID.
  */
 export function useEventHandlers( { clientId, isSelected } ) {
-	const { getBlockRootClientId, getBlockIndex, isZoomOut } = unlock(
-		useSelect( blockEditorStore )
-	);
-	const { insertAfterBlock, removeBlock, resetZoomLevel } = unlock(
-		useDispatch( blockEditorStore )
-	);
+	const { getBlockType } = useSelect( blocksStore );
+	const { getBlockRootClientId, isZoomOut, hasMultiSelection, getBlockName } =
+		unlock( useSelect( blockEditorStore ) );
+	const {
+		insertAfterBlock,
+		removeBlock,
+		resetZoomLevel,
+		startDraggingBlocks,
+		stopDraggingBlocks,
+	} = unlock( useDispatch( blockEditorStore ) );
 
 	return useRefEffect(
 		( node ) => {
@@ -76,7 +83,102 @@ export function useEventHandlers( { clientId, isSelected } ) {
 			 * @param {DragEvent} event Drag event.
 			 */
 			function onDragStart( event ) {
-				event.preventDefault();
+				if (
+					node !== event.target ||
+					node.isContentEditable ||
+					node.ownerDocument.activeElement !== node ||
+					hasMultiSelection()
+				) {
+					event.preventDefault();
+					return;
+				}
+				const data = JSON.stringify( {
+					type: 'block',
+					srcClientIds: [ clientId ],
+					srcRootClientId: getBlockRootClientId( clientId ),
+				} );
+				event.dataTransfer.effectAllowed = 'move'; // remove "+" cursor
+				event.dataTransfer.clearData();
+				event.dataTransfer.setData( 'wp-blocks', data );
+				const { ownerDocument } = node;
+				const { defaultView } = ownerDocument;
+				const selection = defaultView.getSelection();
+				selection.removeAllRanges();
+
+				const domNode = document.createElement( 'div' );
+				const root = createRoot( domNode );
+				root.render(
+					<BlockDraggableChip
+						icon={ getBlockType( getBlockName( clientId ) ).icon }
+					/>
+				);
+				document.body.appendChild( domNode );
+				domNode.style.position = 'absolute';
+				domNode.style.top = '0';
+				domNode.style.left = '0';
+				domNode.style.zIndex = '1000';
+				domNode.style.pointerEvents = 'none';
+
+				// Setting the drag chip as the drag image actually works, but
+				// the behaviour is slightly different in every browser. In
+				// Safari, it animates, in Firefox it's slightly transparent...
+				// So we set a fake drag image and have to reposition it
+				// ourselves.
+				const dragElement = ownerDocument.createElement( 'div' );
+				// Chrome will show a globe icon if the drag element does not
+				// have dimensions.
+				dragElement.style.width = '1px';
+				dragElement.style.height = '1px';
+				dragElement.style.position = 'fixed';
+				dragElement.style.visibility = 'hidden';
+				ownerDocument.body.appendChild( dragElement );
+				event.dataTransfer.setDragImage( dragElement, 0, 0 );
+
+				let offset = { x: 0, y: 0 };
+
+				if ( document !== ownerDocument ) {
+					const frame = defaultView.frameElement;
+					if ( frame ) {
+						const rect = frame.getBoundingClientRect();
+						offset = { x: rect.left, y: rect.top };
+					}
+				}
+
+				// chip handle offset
+				offset.x -= 58;
+
+				function over( e ) {
+					domNode.style.transform = `translate( ${
+						e.clientX + offset.x
+					}px, ${ e.clientY + offset.y }px )`;
+				}
+
+				over( event );
+
+				function end() {
+					ownerDocument.removeEventListener( 'dragover', over );
+					ownerDocument.removeEventListener( 'dragend', end );
+					domNode.remove();
+					dragElement.remove();
+					stopDraggingBlocks();
+					document.body.classList.remove(
+						'is-dragging-components-draggable'
+					);
+					ownerDocument.documentElement.classList.remove(
+						'is-dragging'
+					);
+				}
+
+				ownerDocument.addEventListener( 'dragover', over );
+				ownerDocument.addEventListener( 'dragend', end );
+				ownerDocument.addEventListener( 'drop', end );
+
+				startDraggingBlocks( [ clientId ] );
+				// Important because it hides the block toolbar.
+				document.body.classList.add(
+					'is-dragging-components-draggable'
+				);
+				ownerDocument.documentElement.classList.add( 'is-dragging' );
 			}
 
 			node.addEventListener( 'keydown', onKeyDown );
@@ -91,11 +193,13 @@ export function useEventHandlers( { clientId, isSelected } ) {
 			clientId,
 			isSelected,
 			getBlockRootClientId,
-			getBlockIndex,
 			insertAfterBlock,
 			removeBlock,
 			isZoomOut,
 			resetZoomLevel,
+			hasMultiSelection,
+			startDraggingBlocks,
+			stopDraggingBlocks,
 		]
 	);
 }

packages/block-editor/src/components/iframe/content.scss

@@ -60,5 +60,9 @@
 				}
 			}
 		}
+
+		.wp-block[draggable] {
+			cursor: grab;
+		}
 	}
 }

packages/block-editor/src/components/rich-text/index.js

@@ -431,6 +431,11 @@ export function RichTextWrapper(
 				aria-multiline={ ! disableLineBreaks }
 				aria-readonly={ shouldDisableEditing }
 				{ ...props }
+				// Unset draggable (coming from block props) for contentEditable
+				// elements because it will interfere with multi block selection
+				// when the contentEditable and draggable elements are the same
+				// element.
+				draggable={ undefined }
 				aria-label={
 					bindingsLabel || props[ 'aria-label' ] || placeholder
 				}

packages/block-editor/src/components/use-block-drop-zone/index.js

@@ -332,6 +332,7 @@ export default function useBlockDropZone( {
 		isGroupable,
 		isZoomOut,
 		getSectionRootClientId,
+		getBlockParents,
 	} = unlock( useSelect( blockEditorStore ) );
 	const {
 		showInsertionPoint,
@@ -358,13 +359,29 @@ export default function useBlockDropZone( {
 					// So, ensure that the drag state is set when the user drags over a drop zone.
 					startDragging();
 				}
+
+				const draggedBlockClientIds = getDraggedBlockClientIds();
+				const targetParents = [
+					targetRootClientId,
+					...getBlockParents( targetRootClientId, true ),
+				];
+
+				// Check if the target is within any of the dragged blocks.
+				const isTargetWithinDraggedBlocks = draggedBlockClientIds.some(
+					( clientId ) => targetParents.includes( clientId )
+				);
+
+				if ( isTargetWithinDraggedBlocks ) {
+					return;
+				}
+
 				const allowedBlocks = getAllowedBlocks( targetRootClientId );
 				const targetBlockName = getBlockNamesByClientId( [
 					targetRootClientId,
 				] )[ 0 ];
 
 				const draggedBlockNames = getBlockNamesByClientId(
-					getDraggedBlockClientIds()
+					draggedBlockClientIds
 				);
 				const isBlockDroppingAllowed = isDropTargetValid(
 					getBlockType,

packages/block-editor/src/components/writing-flow/use-drag-selection.js

@@ -80,7 +80,17 @@ export default function useDragSelection() {
 				} );
 			}
 
+			let lastMouseDownTarget;
+
+			function onMouseDown( { target } ) {
+				lastMouseDownTarget = target;
+			}
+
 			function onMouseLeave( { buttons, target, relatedTarget } ) {
+				if ( ! target.contains( lastMouseDownTarget ) ) {
+					return;
+				}
+
 				// If we're moving into a child element, ignore. We're tracking
 				// the mouse leaving the element to a parent, no a child.
 				if ( target.contains( relatedTarget ) ) {
@@ -141,6 +151,7 @@ export default function useDragSelection() {
 			}
 
 			node.addEventListener( 'mouseout', onMouseLeave );
+			node.addEventListener( 'mousedown', onMouseDown );
 
 			return () => {
 				node.removeEventListener( 'mouseout', onMouseLeave );

packages/components/CHANGELOG.md

@@ -16,6 +16,10 @@
 -   Upgraded `@ariakit/react` (v0.4.13) and `@ariakit/test` (v0.4.5) ([#65907](https://github.com/WordPress/gutenberg/pull/65907)).
 -   Upgraded `@ariakit/react` (v0.4.15) and `@ariakit/test` (v0.4.7) ([#67404](https://github.com/WordPress/gutenberg/pull/67404)).
 
+### Bug Fixes
+
+-   `ResizableBox`: Make drag handles focusable ([#67305](https://github.com/WordPress/gutenberg/pull/67305)).
+
 ## 28.13.0 (2024-11-27)
 
 ### Deprecations

packages/components/src/resizable-box/index.tsx

@@ -112,6 +112,16 @@ function UnforwardedResizableBox(
 				showHandle && 'has-show-handle',
 				className
 			) }
+			// Add a focusable element within the drag handle. Unfortunately,
+			// `re-resizable` does not make them properly focusable by default,
+			// causing focus to move the the block wrapper which triggers block
+			// drag.
+			handleComponent={ Object.fromEntries(
+				Object.keys( HANDLE_CLASSES ).map( ( key ) => [
+					key,
+					<div key={ key } tabIndex={ -1 } />,
+				] )
+			) }
 			handleClasses={ HANDLE_CLASSES }
 			handleStyles={ HANDLE_STYLES }
 			ref={ ref }