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alignmentediting.js
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alignmentediting.js
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/**
* @license Copyright (c) 2003-2023, CKSource Holding sp. z o.o. All rights reserved.
* For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
*/
/**
* @module alignment/alignmentediting
*/
import { Plugin } from 'ckeditor5/src/core';
import AlignmentCommand from './alignmentcommand';
import { isDefault, isSupported, normalizeAlignmentOptions, supportedOptions } from './utils';
/**
* The alignment editing feature. It introduces the {@link module:alignment/alignmentcommand~AlignmentCommand command} and adds
* the `alignment` attribute for block elements in the {@link module:engine/model/model~Model model}.
* @extends module:core/plugin~Plugin
*/
export default class AlignmentEditing extends Plugin {
/**
* @inheritDoc
*/
static get pluginName() {
return 'AlignmentEditing';
}
/**
* @inheritDoc
*/
constructor( editor ) {
super( editor );
editor.config.define( 'alignment', {
options: [ ...supportedOptions.map( option => ( { name: option } ) ) ]
} );
}
/**
* @inheritDoc
*/
init() {
const editor = this.editor;
const locale = editor.locale;
const schema = editor.model.schema;
const options = normalizeAlignmentOptions( editor.config.get( 'alignment.options' ) );
// Filter out unsupported options and those that are redundant, e.g. `left` in LTR / `right` in RTL mode.
const optionsToConvert = options.filter(
option => isSupported( option.name ) && !isDefault( option.name, locale )
);
// Once there is at least one `className` defined, we switch to alignment with classes.
const shouldUseClasses = optionsToConvert.some( option => !!option.className );
// Allow alignment attribute on all blocks.
schema.extend( '$block', { allowAttributes: 'alignment' } );
editor.model.schema.setAttributeProperties( 'alignment', { isFormatting: true } );
if ( shouldUseClasses ) {
editor.conversion.attributeToAttribute( buildClassDefinition( optionsToConvert ) );
} else {
// Downcast inline styles.
editor.conversion.for( 'downcast' ).attributeToAttribute( buildDowncastInlineDefinition( optionsToConvert ) );
}
const upcastInlineDefinitions = buildUpcastInlineDefinitions( optionsToConvert );
// Always upcast from inline styles.
for ( const definition of upcastInlineDefinitions ) {
editor.conversion.for( 'upcast' ).attributeToAttribute( definition );
}
const upcastCompatibilityDefinitions = buildUpcastCompatibilityDefinitions( optionsToConvert );
// Always upcast from deprecated `align` attribute.
for ( const definition of upcastCompatibilityDefinitions ) {
editor.conversion.for( 'upcast' ).attributeToAttribute( definition );
}
editor.commands.add( 'alignment', new AlignmentCommand( editor ) );
}
}
// Prepare downcast conversion definition for inline alignment styling.
// @private
function buildDowncastInlineDefinition( options ) {
const definition = {
model: {
key: 'alignment',
values: options.map( option => option.name )
},
view: {}
};
for ( const { name } of options ) {
definition.view[ name ] = {
key: 'style',
value: {
'text-align': name
}
};
}
return definition;
}
// Prepare upcast definitions for inline alignment styles.
// @private
function buildUpcastInlineDefinitions( options ) {
const definitions = [];
for ( const { name } of options ) {
definitions.push( {
view: {
key: 'style',
value: {
'text-align': name
}
},
model: {
key: 'alignment',
value: name
}
} );
}
return definitions;
}
// Prepare upcast definitions for deprecated `align` attribute.
// @private
function buildUpcastCompatibilityDefinitions( options ) {
const definitions = [];
for ( const { name } of options ) {
definitions.push( {
view: {
key: 'align',
value: name
},
model: {
key: 'alignment',
value: name
}
} );
}
return definitions;
}
// Prepare conversion definitions for upcast and downcast alignment with classes.
// @private
function buildClassDefinition( options ) {
const definition = {
model: {
key: 'alignment',
values: options.map( option => option.name )
},
view: {}
};
for ( const option of options ) {
definition.view[ option.name ] = {
key: 'class',
value: option.className
};
}
return definition;
}
/**
* The alignment configuration format descriptor.
*
* const alignmentFormat = {
* name: 'right',
* className: 'my-align-right-class'
* }
*
* @typedef {Object} module:alignment/alignmentediting~AlignmentFormat
*
* @property {'left'|'right'|'center'|'justify'} name One of the alignment names options.
*
* @property {String} className The CSS class used to represent the style in the view.
* Used to override default, inline styling for alignment.
*/