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- /**
- * @license Copyright (c) 2003-2016, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md.
- */
- 'use strict';
- import utils from '../../utils/utils.js';
- import EmitterMixin from '../../utils/emittermixin.js';
- /**
- * DocumentFragment class.
- *
- * @memberOf engine.treeView
- */
- export default class DocumentFragment {
- /**
- * Creates new DocumentFragment instance.
- *
- * @param {engine.treeView.Node|Iterable.<engine.treeView.Node>} [children] List of nodes to be inserted into
- * created document fragment.
- */
- constructor( children ) {
- /**
- * Array of child nodes.
- *
- * @protected
- * @member {Array.<engine.treeView.Element>} engine.treeView.DocumentFragment#_children
- */
- this._children = [];
- if ( children ) {
- this.insertChildren( 0, children );
- }
- }
- /**
- * Iterates over nodes added to this DocumentFragment.
- */
- [ Symbol.iterator ]() {
- return this._children[ Symbol.iterator ]();
- }
- /**
- * {@link engine.treeView.DocumentFragment#insertChildren Insert} a child node or a list of child nodes at the end
- * and sets the parent of these nodes to this fragment.
- *
- * @param {engine.treeView.Node|Iterable.<engine.treeView.Node>} nodes Node or the list of nodes to be inserted.
- * @returns {Number} Number of appended nodes.
- */
- appendChildren( nodes ) {
- return this.insertChildren( this.getChildCount(), nodes );
- }
- /**
- * Gets child at the given index.
- *
- * @param {Number} index Index of child.
- * @returns {engine.treeView.Node} Child node.
- */
- getChild( index ) {
- return this._children[ index ];
- }
- /**
- * Gets the number of elements in fragment.
- *
- * @returns {Number} The number of elements.
- */
- getChildCount() {
- return this._children.length;
- }
- /**
- * Gets index of the given child node. Returns `-1` if child node is not found.
- *
- * @param {engine.treeView.Node} node Child node.
- * @returns {Number} Index of the child node.
- */
- getChildIndex( node ) {
- return this._children.indexOf( node );
- }
- /**
- * Gets child nodes iterator.
- *
- * @returns {Iterable.<engine.treeView.Node>} Child nodes iterator.
- */
- getChildren() {
- return this._children[ Symbol.iterator ]();
- }
- /**
- * Inserts a child node or a list of child nodes on the given index and sets the parent of these nodes to
- * this fragment.
- *
- * @param {Number} index Position where nodes should be inserted.
- * @param {engine.treeView.Node|Iterable.<engine.treeView.Node>} nodes Node or list of nodes to be inserted.
- * @returns {Number} Number of inserted nodes.
- */
- insertChildren( index, nodes ) {
- this._fireChange( 'CHILDREN', this );
- let count = 0;
- if ( !utils.isIterable( nodes ) ) {
- nodes = [ nodes ];
- }
- for ( let node of nodes ) {
- node.parent = this;
- this._children.splice( index, 0, node );
- index++;
- count++;
- }
- return count;
- }
- /**
- * Removes number of child nodes starting at the given index and set the parent of these nodes to `null`.
- *
- * @param {Number} index Number of the first node to remove.
- * @param {Number} [howMany=1] Number of nodes to remove.
- * @returns {Array.<engine.treeView.Node>} The array of removed nodes.
- */
- removeChildren( index, howMany = 1 ) {
- this._fireChange( 'CHILDREN', this );
- for ( let i = index; i < index + howMany; i++ ) {
- this._children[ i ].parent = null;
- }
- return this._children.splice( index, howMany );
- }
- /**
- * Fires `change` event with given type of the change.
- *
- * @private
- * @param {engine.treeView.ChangeType} type Type of the change.
- * @param {engine.treeView.Node} node Changed node.
- * @fires engine.treeView.Node#change
- */
- _fireChange( type, node ) {
- this.fire( 'change', type, node );
- }
- }
- utils.mix( DocumentFragment, EmitterMixin );
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