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documentlist.js
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documentlist.js
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/**
* @license Copyright (c) 2003-2022, CKSource Holding sp. z o.o. All rights reserved.
* For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
*/
/**
* @module html-support/integrations/documentlist
*/
import { isEqual } from 'lodash-es';
import { Plugin } from 'ckeditor5/src/core';
import { setViewAttributes } from '../conversionutils.js';
import DataFilter from '../datafilter';
/**
* Provides the General HTML Support integration with the {@link module:list/documentlist~DocumentList Document List} feature.
*
* @extends module:core/plugin~Plugin
*/
export default class DocumentListElementSupport extends Plugin {
/**
* @inheritDoc
*/
static get requires() {
return [ DataFilter ];
}
/**
* @inheritDoc
*/
init() {
const editor = this.editor;
if ( !editor.plugins.has( 'DocumentListEditing' ) ) {
return;
}
const schema = editor.model.schema;
const conversion = editor.conversion;
const dataFilter = editor.plugins.get( DataFilter );
const documentListEditing = editor.plugins.get( 'DocumentListEditing' );
// Register downcast strategy.
// Note that this must be done before document list editing registers conversion in afterInit.
documentListEditing.registerDowncastStrategy( {
scope: 'item',
attributeName: 'htmlLiAttributes',
setAttributeOnDowncast( writer, attributeValue, viewElement ) {
setViewAttributes( writer, attributeValue, viewElement );
}
} );
documentListEditing.registerDowncastStrategy( {
scope: 'list',
attributeName: 'htmlListAttributes',
setAttributeOnDowncast( writer, viewAttributes, viewElement ) {
setViewAttributes( writer, viewAttributes, viewElement );
}
} );
dataFilter.on( 'register', ( evt, definition ) => {
if ( ![ 'ul', 'ol', 'li' ].includes( definition.view ) ) {
return;
}
evt.stop();
// Do not register same converters twice.
if ( schema.checkAttribute( '$block', 'htmlListAttributes' ) ) {
return;
}
schema.extend( '$block', { allowAttributes: [ 'htmlListAttributes', 'htmlLiAttributes' ] } );
schema.extend( '$blockObject', { allowAttributes: [ 'htmlListAttributes', 'htmlLiAttributes' ] } );
schema.extend( '$container', { allowAttributes: [ 'htmlListAttributes', 'htmlLiAttributes' ] } );
conversion.for( 'upcast' ).add( dispatcher => {
dispatcher.on( 'element:ul', viewToModelListAttributeConverter( 'htmlListAttributes', dataFilter ), { priority: 'low' } );
dispatcher.on( 'element:ol', viewToModelListAttributeConverter( 'htmlListAttributes', dataFilter ), { priority: 'low' } );
dispatcher.on( 'element:li', viewToModelListAttributeConverter( 'htmlLiAttributes', dataFilter ), { priority: 'low' } );
} );
} );
// Make sure that all items in a single list (items at the same level & listType) have the same properties.
// Note: This is almost an exact copy from DocumentListPropertiesEditing.
documentListEditing.on( 'postFixer', ( evt, { listNodes, writer } ) => {
const previousNodesByIndent = []; // Last seen nodes of lower indented lists.
for ( const { node, previous } of listNodes ) {
// For the first list block there is nothing to compare with.
if ( !previous ) {
continue;
}
const nodeIndent = node.getAttribute( 'listIndent' );
const previousNodeIndent = previous.getAttribute( 'listIndent' );
let previousNodeInList = null; // It's like `previous` but has the same indent as current node.
// Let's find previous node for the same indent.
// We're going to need that when we get back to previous indent.
if ( nodeIndent > previousNodeIndent ) {
previousNodesByIndent[ previousNodeIndent ] = previous;
}
// Restore the one for given indent.
else if ( nodeIndent < previousNodeIndent ) {
previousNodeInList = previousNodesByIndent[ nodeIndent ];
previousNodesByIndent.length = nodeIndent;
}
// Same indent.
else {
previousNodeInList = previous;
}
// This is a first item of a nested list.
if ( !previousNodeInList ) {
continue;
}
if ( previousNodeInList.getAttribute( 'listType' ) == node.getAttribute( 'listType' ) ) {
const value = previousNodeInList.getAttribute( 'htmlListAttributes' );
if ( !isEqual( node.getAttribute( 'htmlListAttributes' ), value ) ) {
writer.setAttribute( 'htmlListAttributes', value, node );
evt.return = true;
}
}
if ( previousNodeInList.getAttribute( 'listItemId' ) == node.getAttribute( 'listItemId' ) ) {
const value = previousNodeInList.getAttribute( 'htmlLiAttributes' );
if ( !isEqual( node.getAttribute( 'htmlLiAttributes' ), value ) ) {
writer.setAttribute( 'htmlLiAttributes', value, node );
evt.return = true;
}
}
}
} );
}
/**
* @inheritDoc
*/
afterInit() {
const editor = this.editor;
if ( !editor.commands.get( 'indentList' ) ) {
return;
}
// Reset list attributes after indenting list items.
this.listenTo( editor.commands.get( 'indentList' ), 'afterExecute', ( evt, changedBlocks ) => {
editor.model.change( writer => {
for ( const node of changedBlocks ) {
// Just reset the attribute.
// If there is a previous indented list that this node should be merged into,
// the postfixer will unify all the attributes of both sub-lists.
writer.setAttribute( 'htmlListAttributes', {}, node );
}
} );
} );
}
}
// View-to-model conversion helper preserving allowed attributes on {@link TODO}
// feature model element.
//
// @private
// @param {String} attributeName
// @param {module:html-support/datafilter~DataFilter} dataFilter
// @returns {Function} Returns a conversion callback.
function viewToModelListAttributeConverter( attributeName, dataFilter ) {
return ( evt, data, conversionApi ) => {
const viewElement = data.viewItem;
if ( !data.modelRange ) {
Object.assign( data, conversionApi.convertChildren( data.viewItem, data.modelCursor ) );
}
const viewAttributes = dataFilter._consumeAllowedAttributes( viewElement, conversionApi );
for ( const item of data.modelRange.getItems( { shallow: true } ) ) {
// Apply only to list item blocks.
if ( !item.hasAttribute( 'listItemId' ) ) {
continue;
}
// Set list attributes only on same level items, those nested deeper are already handled
// by the recursive conversion.
if ( item.hasAttribute( attributeName ) ) {
continue;
}
conversionApi.writer.setAttribute( attributeName, viewAttributes || {}, item );
}
};
}