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* @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module table/tablekeyboard\n */\n\nimport TableSelection from './tableselection';\nimport TableWalker from './tablewalker';\n\nimport { Plugin } from 'ckeditor5/src/core';\nimport { getLocalizedArrowKeyCodeDirection } from 'ckeditor5/src/utils';\nimport { getSelectedTableCells, getTableCellsContainingSelection } from './utils/selection';\n\n/**\n * This plugin enables keyboard navigation for tables.\n * It is loaded automatically by the {@link module:table/table~Table} plugin.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class TableKeyboard extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'TableKeyboard';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ TableSelection ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst view = this.editor.editing.view;\n\t\tconst viewDocument = view.document;\n\n\t\t// Handle Tab key navigation.\n\t\tthis.editor.keystrokes.set( 'Tab', ( ...args ) => this._handleTabOnSelectedTable( ...args ), { priority: 'low' } );\n\t\tthis.editor.keystrokes.set( 'Tab', this._getTabHandler( true ), { priority: 'low' } );\n\t\tthis.editor.keystrokes.set( 'Shift+Tab', this._getTabHandler( false ), { priority: 'low' } );\n\n\t\tthis.listenTo( viewDocument, 'arrowKey', ( ...args ) => this._onArrowKey( ...args ), { context: 'table' } );\n\t}\n\n\t/**\n\t * Handles {@link module:engine/view/document~Document#event:keydown keydown} events for the <kbd>Tab</kbd> key executed\n\t * when the table widget is selected.\n\t *\n\t * @private\n\t * @param {module:engine/view/observer/keyobserver~KeyEventData} data Key event data.\n\t * @param {Function} cancel The stop/stopPropagation/preventDefault function.\n\t */\n\t_handleTabOnSelectedTable( data, cancel ) {\n\t\tconst editor = this.editor;\n\t\tconst selection = editor.model.document.selection;\n\t\tconst selectedElement = selection.getSelectedElement();\n\n\t\tif ( !selectedElement || !selectedElement.is( 'element', 'table' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tcancel();\n\n\t\teditor.model.change( writer => {\n\t\t\twriter.setSelection( writer.createRangeIn( selectedElement.getChild( 0 ).getChild( 0 ) ) );\n\t\t} );\n\t}\n\n\t/**\n\t * Returns a handler for {@link module:engine/view/document~Document#event:keydown keydown} events for the <kbd>Tab</kbd> key executed\n\t * inside table cells.\n\t *\n\t * @private\n\t * @param {Boolean} isForward Whether this handler will move the selection to the next or the previous cell.\n\t */\n\t_getTabHandler( isForward ) {\n\t\tconst editor = this.editor;\n\n\t\treturn ( domEventData, cancel ) => {\n\t\t\tconst selection = editor.model.document.selection;\n\t\t\tlet tableCell = getTableCellsContainingSelection( selection )[ 0 ];\n\n\t\t\tif ( !tableCell ) {\n\t\t\t\ttableCell = this.editor.plugins.get( 'TableSelection' ).getFocusCell();\n\t\t\t}\n\n\t\t\tif ( !tableCell ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tcancel();\n\n\t\t\tconst tableRow = tableCell.parent;\n\t\t\tconst table = tableRow.parent;\n\n\t\t\tconst currentRowIndex = table.getChildIndex( tableRow );\n\t\t\tconst currentCellIndex = tableRow.getChildIndex( tableCell );\n\n\t\t\tconst isFirstCellInRow = currentCellIndex === 0;\n\n\t\t\tif ( !isForward && isFirstCellInRow && currentRowIndex === 0 ) {\n\t\t\t\t// Set the selection over the whole table if the selection was in the first table cell.\n\t\t\t\teditor.model.change( writer => {\n\t\t\t\t\twriter.setSelection( writer.createRangeOn( table ) );\n\t\t\t\t} );\n\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst tableUtils = this.editor.plugins.get( 'TableUtils' );\n\t\t\tconst isLastCellInRow = currentCellIndex === tableRow.childCount - 1;\n\t\t\tconst isLastRow = currentRowIndex === tableUtils.getRows( table ) - 1;\n\n\t\t\tif ( isForward && isLastRow && isLastCellInRow ) {\n\t\t\t\teditor.execute( 'insertTableRowBelow' );\n\n\t\t\t\t// Check if the command actually added a row. 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