TinyMCE per block: Trying the temporary content editable approach for cross-block selection

tinymce-per-block/package.json

@@ -52,6 +52,7 @@
     "classnames": "^2.2.5",
     "is-equal-shallow": "^0.1.3",
     "lodash": "^4.17.4",
+    "rangy": "^1.3.0",
     "react": "^15.4.2",
     "react-dom": "^15.4.2",
     "react-textarea-autosize": "^4.0.5"

tinymce-per-block/src/blocks/embed-block/form.js

@@ -91,6 +91,7 @@ export default class EmbedBlockForm extends Component {
 										placeholder="Write caption"
 										focusConfig={ focusConfig }
 										onFocusChange={ api.focus }
+										selectionName="caption"
 									/>
 								</div>
 							}

tinymce-per-block/src/blocks/heading-block/form.js

@@ -91,6 +91,7 @@ export default class HeadingBlockForm extends Component {
 						focusConfig={ focusConfig }
 						onFocusChange={ api.focus }
 						onType={ api.unselect }
+						selectionName="content"
 						single
 						inline
 					/>

tinymce-per-block/src/blocks/html-block/form.js

@@ -72,6 +72,7 @@ export default class HtmlBlockForm extends Component {
 						focusConfig={ focusConfig }
 						onFocusChange={ api.focus }
 						onType={ api.unselect }
+						selectionName="caption"
 					/>
 				</div>
 			</div>

tinymce-per-block/src/blocks/image-block/form.js

@@ -61,6 +61,7 @@ export default class ImageBlockForm extends Component {
 								placeholder="Write caption"
 								focusConfig={ focusConfig }
 								onFocusChange={ api.focus }
+								selectionName="caption"
 							/>
 						</div>
 					}

tinymce-per-block/src/blocks/quote-block/form.js

@@ -106,6 +106,7 @@ export default class QuoteBlockForm extends Component {
 							focusConfig={ focusInput === 'content' ? focusConfig : null }
 							onFocusChange={ ( config ) => api.focus( Object.assign( { input: 'content' }, config ) ) }
 							onType={ api.unselect }
+							selectionName="caption"
 							inline
 						/>
 					</div>
@@ -124,6 +125,7 @@ export default class QuoteBlockForm extends Component {
 								focusConfig={ focusInput === 'cite' ? focusConfig : null }
 								onFocusChange={ ( config ) => api.focus( Object.assign( { input: 'cite' }, config ) ) }
 								onType={ api.unselect }
+								selectionName="cite"
 								inline
 								single
 							/>

tinymce-per-block/src/blocks/text-block/form.js

@@ -86,6 +86,7 @@ export default class TextBlockForm extends Component {
 						focusConfig={ focusConfig }
 						onFocusChange={ api.focus }
 						onType={ api.unselect }
+						selectionName="content"
 						inline
 					/>
 				</div>

tinymce-per-block/src/external/wp-blocks/editable/index.js

@@ -217,8 +217,10 @@ export default class EditableComponent extends Component {
 	};
 
 	onFocus = () => {
-		const bookmark = this.editor.selection.getBookmark( 2, true );
-		this.props.onFocusChange( { bookmark } );
+		if ( ! this.props.focusConfig ) {
+			const bookmark = this.editor.selection.getBookmark( 2, true );
+			this.props.onFocusChange( { bookmark } );
+		}
 	};
 
 	onSetup = ( editor ) => {
@@ -256,7 +258,7 @@ export default class EditableComponent extends Component {
 	render() {
 		return (
 			<div ref={ this.setRef }>
-				<div contentEditable />
+				<div contentEditable data-selection={ this.props.selectionName } />
 			</div>
 		);
 	}

tinymce-per-block/src/external/wp-blocks/input/index.js

@@ -84,7 +84,8 @@ export default class EnhancedInput extends Component {
 	render() {
 		// Keeping splitValue to exclude it from props
 		const ignoredProps = [
-			'value', 'splitValue', 'removePrevious', 'moveCursorDown', 'moveCursorUp', 'focusConfig', 'onFocusChange'
+			'value', 'splitValue', 'removePrevious', 'moveCursorDown', 'moveCursorUp',
+			'focusConfig', 'onFocusChange', 'selectionName'
 		];
 		const { value } = this.props;
 		const props = omit( this.props, ignoredProps );
@@ -100,7 +101,8 @@ export default class EnhancedInput extends Component {
 				<div
 					className="textarea-mirror"
 					ref={ this.bindMirror }
-					style={ style } />
+					style={ style }
+				/>
 				<Textarea
 					ref={ this.bindInput }
 					{ ...props }
@@ -109,6 +111,7 @@ export default class EnhancedInput extends Component {
 					onKeyDown={ this.onKeyDown }
 					onChange={ this.onChange }
 					onFocus={ this.onFocus }
+					data-selection={ this.props.selectionName }
 				/>
 			</div>
 		);

tinymce-per-block/src/renderers/block/_style.scss

@@ -2,6 +2,10 @@
 	list-style: none;
 	padding: 0;
 	margin: 0;
+
+	&:focus {
+		outline: 0;
+	}
 }
 
 .block-list__block {

tinymce-per-block/src/renderers/block/index.js

@@ -6,6 +6,7 @@ import { map, debounce } from 'lodash';
 import { findDOMNode } from 'react-dom';
 import classNames from 'classnames';
 import { getBlock } from 'wp-blocks';
+import rangy from 'rangy';
 
 /**
  * Internal dependencies
@@ -20,10 +21,12 @@ class BlockList extends Component {
 		selected: null,
 		focus: { uid: null },
 		blocks: [],
+		contentEditable: false
 	};
 
-	blockNodes = [];
+	blockNodes = {};
 	commands = [];
+	selections = [];
 
 	bindEditor = ( ref ) => {
 		this.editor = ref;
@@ -39,6 +42,57 @@ class BlockList extends Component {
 	componentDidMount() {
 		this.setState( { blocks: this.props.content } );
 		window.addEventListener( 'click', this.handleDocumentClick );
+		this.editor.addEventListener( 'mousedown', () => {
+			this.setState( { contentEditable: true } );
+		} );
+		this.editor.addEventListener( 'mouseup', () => {
+			const range = rangy.getSelection().getRangeAt( 0 );
+			let closestContentEditable;
+			if ( ! range.commonAncestorContainer.getAttribute ) {
+				closestContentEditable = range.commonAncestorContainer.parentNode.closest( '[contentEditable]' );
+			}
+			else if ( range.commonAncestorContainer.getAttribute( 'contentEditable' ) ) {
+				closestContentEditable = range.commonAncestorContainer;
+			} else {
+				closestContentEditable = range.commonAncestorContainer.closest( '[contentEditable]' );
+			}
+			const editorNode = findDOMNode( this.editor );
+			if ( range.collpased || closestContentEditable !== editorNode ) {
+				this.setState( { contentEditable: false } );
+			}
+		} );
+		document.addEventListener( 'selectionchange', () => {
+			const range = rangy.getSelection().getRangeAt( 0 );
+			if ( range.commonAncestorContainer !== findDOMNode( this.editor ) ) {
+				return;
+			}
+			const blockSelections = [];
+			this.state.blocks.forEach( ( { uid } ) => {
+				const blockNode = this.blockNodes[ uid ];
+				const blockDomNode = findDOMNode( blockNode );
+				const selectionNodes = Array.from( blockDomNode.querySelectorAll( '[data-selection]' ) );
+				const contained = range.containsNode( blockDomNode );
+				const containedPartially = range.containsNode( blockDomNode, true );
+				const selections = selectionNodes.map( ( selectionNode ) => {
+					const id = selectionNode.getAttribute( 'data-selection' );
+					const nodeRange = rangy.createRange();
+					nodeRange.selectNodeContents( selectionNode );
+					const intersection = nodeRange.intersection( range );
+					if ( ! intersection ) {
+						return { id, content: false };
+					}
+					const content = intersection.toHtml();
+					return { id, content, node: selectionNode, range: intersection };
+				} );
+				blockSelections.push( {
+					uid,
+					contained,
+					containedPartially,
+					selections
+				} );
+			} );
+			this.selections = blockSelections;
+		} );
 	}
 
 	componentWillUnmount() {
@@ -99,14 +153,55 @@ class BlockList extends Component {
 
 	addBlock = ( id ) => {
 		this.executeCommand( { type: 'addBlock', id } );
-	}
+	};
+
+	onKeyDown = ( event ) => {
+		if ( ! this.state.contentEditable ) {
+			return;
+		}
+		event.preventDefault();
+		event.stopPropagation();
+		const containedElements = this.selections.filter( selection => selection.contained );
+		const containedPartially = this.selections.filter( selection => selection.containedPartially );
+		containedElements.forEach( ( { uid } ) => {
+			const command = commands.remove();
+			command.uid = uid;
+			this.executeCommand( command );
+		} );
+		containedPartially.forEach( ( { uid, selections } ) => {
+			const changes = selections.reduce(
+				( memo, selection ) => {
+					if ( ! selection.content ) {
+						return memo;
+					}
+					selection.range.deleteContents();
+					memo[ selection.id ] = selection.node.innerHTML;
+					return memo;
+				},
+				{}
+			);
+			const command = commands.change( changes );
+			command.uid = uid;
+			this.executeCommand( command );
+		} );
+		if ( containedPartially.length === 2 ) {
+			const mergedBlock = containedPartially[ 1 ].uid;
+			const command = commands.mergeWithPrevious();
+			command.uid = mergedBlock;
+			this.executeCommand( command );
+		}
+
+		setTimeout( () => {
+			this.setState( { contentEditable: false } );
+		} );
+	};
 
 	render() {
-		const { blocks, focus, selected, hovered } = this.state;
+		const { blocks, focus, selected, hovered, contentEditable } = this.state;
 
 		return (
 			<div>
-				<div className="block-list" ref={ this.bindEditor }>
+				<div className="block-list" ref={ this.bindEditor } contentEditable={ contentEditable } suppressContentEditableWarning onKeyDown={ this.onKeyDown }>
 					{ map( blocks, ( block, index ) => {
 						const isFocused = block.uid === focus.uid;
 						const api = Object.keys( commands ).reduce( ( memo, command ) => {