| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138 |
- /**
- * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
- */
- /**
- * @module basic-styles/attributecommand
- */
- import Command from '@ckeditor/ckeditor5-core/src/command';
- /**
- * An extension of the base {@link module:core/command~Command} class, which provides utilities for a command
- * that toggles a single attribute on a text or an element.
- *
- * `AttributeCommand` uses {@link module:engine/model/document~Document#selection}
- * to decide which nodes (if any) should be changed, and applies or removes the attribute from them.
- *
- * The command checks the {@link module:engine/model/model~Model#schema} to decide if it can be enabled
- * for the current selection and to which nodes the attribute can be applied.
- *
- * @extends module:core/command~Command
- */
- export default class AttributeCommand extends Command {
- /**
- * @param {module:core/editor/editor~Editor} editor
- * @param {String} attributeKey Attribute that will be set by the command.
- */
- constructor( editor, attributeKey ) {
- super( editor );
- /**
- * The attribute that will be set by the command.
- *
- * @readonly
- * @member {String}
- */
- this.attributeKey = attributeKey;
- /**
- * Flag indicating whether the command is active. The command is active when the
- * {@link module:engine/model/selection~Selection#hasAttribute selection has the attribute} which means that:
- *
- * * If the selection is not empty – That the attribute is set on the first node in the selection that allows this attribute.
- * * If the selection is empty – That the selection has the attribute itself (which means that newly typed
- * text will have this attribute, too).
- *
- * @observable
- * @readonly
- * @member {Boolean} #value
- */
- }
- /**
- * Updates the command's {@link #value} and {@link #isEnabled} based on the current selection.
- */
- refresh() {
- const model = this.editor.model;
- const doc = model.document;
- this.value = this._getValueFromFirstAllowedNode();
- this.isEnabled = model.schema.checkAttributeInSelection( doc.selection, this.attributeKey );
- }
- /**
- * Executes the command — applies the attribute to the selection or removes it from the selection.
- *
- * If the command is active (`value == true`), it will remove attributes. Otherwise, it will set attributes.
- *
- * The execution result differs, depending on the {@link module:engine/model/document~Document#selection}:
- *
- * * If the selection is on a range, the command applies the attribute to all nodes in that range
- * (if they are allowed to have this attribute by the {@link module:engine/model/schema~Schema schema}).
- * * If the selection is collapsed in a non-empty node, the command applies the attribute to the
- * {@link module:engine/model/document~Document#selection} itself (note that typed characters copy attributes from the selection).
- * * If the selection is collapsed in an empty node, the command applies the attribute to the parent node of the selection (note
- * that the selection inherits all attributes from a node if it is in an empty node).
- *
- * @fires execute
- * @param {Object} [options] Command options.
- * @param {Boolean} [options.forceValue] If set, it will force the command behavior. If `true`, the command will apply the attribute,
- * otherwise the command will remove the attribute.
- * If not set, the command will look for its current value to decide what it should do.
- */
- execute( options = {} ) {
- const model = this.editor.model;
- const doc = model.document;
- const selection = doc.selection;
- const value = ( options.forceValue === undefined ) ? !this.value : options.forceValue;
- model.change( writer => {
- if ( selection.isCollapsed ) {
- if ( value ) {
- writer.setSelectionAttribute( this.attributeKey, true );
- } else {
- writer.removeSelectionAttribute( this.attributeKey );
- }
- } else {
- const ranges = model.schema.getValidRanges( selection.getRanges(), this.attributeKey );
- for ( const range of ranges ) {
- if ( value ) {
- writer.setAttribute( this.attributeKey, value, range );
- } else {
- writer.removeAttribute( this.attributeKey, range );
- }
- }
- }
- } );
- }
- /**
- * Checks the attribute value of the first node in the selection that allows the attribute.
- * For the collapsed selection returns the selection attribute.
- *
- * @private
- * @returns {Boolean} The attribute value.
- */
- _getValueFromFirstAllowedNode() {
- const model = this.editor.model;
- const schema = model.schema;
- const selection = model.document.selection;
- if ( selection.isCollapsed ) {
- return selection.hasAttribute( this.attributeKey );
- }
- for ( const range of selection.getRanges() ) {
- for ( const item of range.getItems() ) {
- if ( schema.checkAttribute( item, this.attributeKey ) ) {
- return item.hasAttribute( this.attributeKey );
- }
- }
- }
- return false;
- }
- }
|