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- /**
- * @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 table/commands/mergecellscommand
- */
- import Command from '@ckeditor/ckeditor5-core/src/command';
- import TableWalker from '../tablewalker';
- import { findAncestor, updateNumericAttribute } from './utils';
- import TableUtils from '../tableutils';
- import { getRowIndexes, getSelectedTableCells } from '../utils';
- /**
- * The merge cells command.
- *
- * The command is registered by the {@link module:table/tableediting~TableEditing} as `'mergeTableCells'` editor command.
- *
- * For example, to merge selected table cells:
- *
- * editor.execute( 'mergeTableCells' );
- *
- * @extends module:core/command~Command
- */
- export default class MergeCellsCommand extends Command {
- /**
- * @inheritDoc
- */
- refresh() {
- this.isEnabled = canMergeCells( this.editor.model.document.selection, this.editor.plugins.get( TableUtils ) );
- }
- /**
- * Executes the command.
- *
- * @fires execute
- */
- execute() {
- const model = this.editor.model;
- const tableUtils = this.editor.plugins.get( TableUtils );
- model.change( writer => {
- const selectedTableCells = getSelectedTableCells( model.document.selection );
- // All cells will be merge into the first one.
- const firstTableCell = selectedTableCells.shift();
- // Update target cell dimensions.
- const { mergeWidth, mergeHeight } = getMergeDimensions( firstTableCell, selectedTableCells, tableUtils );
- updateNumericAttribute( 'colspan', mergeWidth, firstTableCell, writer );
- updateNumericAttribute( 'rowspan', mergeHeight, firstTableCell, writer );
- for ( const tableCell of selectedTableCells ) {
- const tableRow = tableCell.parent;
- mergeTableCells( tableCell, firstTableCell, writer );
- removeRowIfEmpty( tableRow, writer );
- }
- writer.setSelection( firstTableCell, 'in' );
- } );
- }
- }
- // Properly removes the empty row from a table. Updates the `rowspan` attribute of cells that overlap the removed row.
- //
- // @param {module:engine/model/element~Element} row
- // @param {module:engine/model/writer~Writer} writer
- function removeRowIfEmpty( row, writer ) {
- if ( row.childCount ) {
- return;
- }
- const table = row.parent;
- const removedRowIndex = table.getChildIndex( row );
- for ( const { cell, row, rowspan } of new TableWalker( table, { endRow: removedRowIndex } ) ) {
- const overlapsRemovedRow = row + rowspan - 1 >= removedRowIndex;
- if ( overlapsRemovedRow ) {
- updateNumericAttribute( 'rowspan', rowspan - 1, cell, writer );
- }
- }
- writer.remove( row );
- }
- // Merges two table cells - will ensure that after merging cells with empty paragraphs the result table cell will only have one paragraph.
- // If one of the merged table cells is empty, the merged table cell will have contents of the non-empty table cell.
- // If both are empty, the merged table cell will have only one empty paragraph.
- //
- // @param {module:engine/model/element~Element} cellBeingMerged
- // @param {module:engine/model/element~Element} targetCell
- // @param {module:engine/model/writer~Writer} writer
- function mergeTableCells( cellBeingMerged, targetCell, writer ) {
- if ( !isEmpty( cellBeingMerged ) ) {
- if ( isEmpty( targetCell ) ) {
- writer.remove( writer.createRangeIn( targetCell ) );
- }
- writer.move( writer.createRangeIn( cellBeingMerged ), writer.createPositionAt( targetCell, 'end' ) );
- }
- // Remove merged table cell.
- writer.remove( cellBeingMerged );
- }
- // Checks if the passed table cell contains an empty paragraph.
- //
- // @param {module:engine/model/element~Element} tableCell
- // @returns {Boolean}
- function isEmpty( tableCell ) {
- return tableCell.childCount == 1 && tableCell.getChild( 0 ).is( 'paragraph' ) && tableCell.getChild( 0 ).isEmpty;
- }
- // Checks if the selection contains mergeable cells.
- //
- // In a table below:
- //
- // ┌───┬───┬───┬───┐
- // │ a │ b │ c │ d │
- // ├───┴───┼───┤ │
- // │ e │ f │ │
- // ├ ├───┼───┤
- // │ │ g │ h │
- // └───────┴───┴───┘
- //
- // Valid selections are these which create a solid rectangle (without gaps), such as:
- // - a, b (two horizontal cells)
- // - c, f (two vertical cells)
- // - a, b, e (cell "e" spans over four cells)
- // - c, d, f (cell d spans over a cell in the row below)
- //
- // While an invalid selection would be:
- // - a, c (cell "b" not selected creates a gap)
- // - f, g, h (cell "d" spans over a cell from row of "f" cell - thus creates a gap)
- //
- // @param {module:engine/model/selection~Selection} selection
- // @param {module:table/tableUtils~TableUtils} tableUtils
- // @returns {boolean}
- function canMergeCells( selection, tableUtils ) {
- const selectedTableCells = getSelectedTableCells( selection );
- if ( selectedTableCells.length < 2 || !areCellInTheSameTableSection( selectedTableCells ) ) {
- return false;
- }
- // A valid selection is a fully occupied rectangle composed of table cells.
- // Below we will calculate the area of a selected table cells and the area of valid selection.
- // The area of a valid selection is defined by top-left and bottom-right cells.
- const rows = new Set();
- const columns = new Set();
- let areaOfSelectedCells = 0;
- for ( const tableCell of selectedTableCells ) {
- const { row, column } = tableUtils.getCellLocation( tableCell );
- const rowspan = parseInt( tableCell.getAttribute( 'rowspan' ) || 1 );
- const colspan = parseInt( tableCell.getAttribute( 'colspan' ) || 1 );
- // Record row & column indexes of current cell.
- rows.add( row );
- columns.add( column );
- // For cells that spans over multiple rows add also the last row that this cell spans over.
- if ( rowspan > 1 ) {
- rows.add( row + rowspan - 1 );
- }
- // For cells that spans over multiple columns add also the last column that this cell spans over.
- if ( colspan > 1 ) {
- columns.add( column + colspan - 1 );
- }
- areaOfSelectedCells += ( rowspan * colspan );
- }
- // We can only merge table cells that are in adjacent rows...
- const areaOfValidSelection = getBiggestRectangleArea( rows, columns );
- return areaOfValidSelection == areaOfSelectedCells;
- }
- // Calculates the area of a maximum rectangle that can span over provided row & column indexes.
- //
- // @param {Array.<Number>} rows
- // @param {Array.<Number>} columns
- // @returns {Number}
- function getBiggestRectangleArea( rows, columns ) {
- const rowsIndexes = Array.from( rows.values() );
- const columnIndexes = Array.from( columns.values() );
- const lastRow = Math.max( ...rowsIndexes );
- const firstRow = Math.min( ...rowsIndexes );
- const lastColumn = Math.max( ...columnIndexes );
- const firstColumn = Math.min( ...columnIndexes );
- return ( lastRow - firstRow + 1 ) * ( lastColumn - firstColumn + 1 );
- }
- function areCellInTheSameTableSection( tableCells ) {
- const table = findAncestor( 'table', tableCells[ 0 ] );
- const rowIndexes = getRowIndexes( tableCells );
- const headingRows = parseInt( table.getAttribute( 'headingRows' ) || 0 );
- const firstCellIsInBody = rowIndexes.first > headingRows - 1;
- const lastCellIsInBody = rowIndexes.last > headingRows - 1;
- return firstCellIsInBody === lastCellIsInBody;
- }
- function getMergeDimensions( firstTableCell, selectedTableCells, tableUtils ) {
- let maxWidthOffset = 0;
- let maxHeightOffset = 0;
- for ( const tableCell of selectedTableCells ) {
- const { row, column } = tableUtils.getCellLocation( tableCell );
- maxWidthOffset = getMaxOffset( tableCell, column, maxWidthOffset, 'colspan' );
- maxHeightOffset = getMaxOffset( tableCell, row, maxHeightOffset, 'rowspan' );
- }
- // Update table cell span attribute and merge set selection on a merged contents.
- const { row: firstCellRow, column: firstCellColumn } = tableUtils.getCellLocation( firstTableCell );
- const mergeWidth = maxWidthOffset - firstCellColumn;
- const mergeHeight = maxHeightOffset - firstCellRow;
- return { mergeWidth, mergeHeight };
- }
- function getMaxOffset( tableCell, start, currentMaxOffset, which ) {
- const dimensionValue = parseInt( tableCell.getAttribute( which ) || 1 );
- return Math.max( currentMaxOffset, start + dimensionValue );
- }
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