| /******************************************************************************* |
| * Copyright (c) 2022 Dirk Steinkamp |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * Dirk Steinkamp <dirk.steinkamp@gmx.de> - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ui.internal.texteditor.multiselection; |
| |
| import org.eclipse.core.commands.ExecutionException; |
| |
| import org.eclipse.jface.text.IRegion; |
| |
| /** |
| * Handler to change the current multi selection downwards. This might either |
| * mean to extend the selection by adding a match below, or shrink the selection |
| * by removing the first selection range. This depends on the selection a multi |
| * caret/selection command was invoked with the first time -- that selection is |
| * remembered as an "anchor" to which successive calls are related as reference |
| * selection.<br> |
| * If no word is selected, an implicit selection of the word under the cursor is |
| * performed. |
| */ |
| public class MultiSelectionDownHandler extends AbstractMultiSelectionHandler { |
| |
| @Override |
| public void execute() throws ExecutionException { |
| if (nothingSelected()) { |
| selectIdentifierUnderCaret(); |
| } else if (selectionIsAboveAnchorRegion()) { |
| removeFirstRegionFromSelection(); |
| } else { |
| extendSelectionToNextMatch(); |
| } |
| } |
| |
| private void extendSelectionToNextMatch() throws ExecutionException { |
| if (allRegionsHaveSameText()) { |
| IRegion[] regions = getSelectedRegions(); |
| IRegion nextMatch = findNextMatch(regions[regions.length - 1]); |
| selectRegions(addRegion(regions, nextMatch)); |
| } |
| } |
| |
| private void removeFirstRegionFromSelection() { |
| if (allRegionsHaveSameText()) { |
| selectRegions(removeFirstRegionButOne(getSelectedRegions())); |
| } |
| } |
| } |