ltk/org.eclipse.statet.ltk.ui/src/org/eclipse/statet/ltk/ui/sourceediting/actions/SelectPreviousWordHandler.java

/*=============================================================================#
 # Copyright (c) 2011, 2019 Stephan Wahlbrink and others.
 # 
 # This program and the accompanying materials are made available under the
 # terms of the Eclipse Public License 2.0 which is available at
 # https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
 # which is available at https://www.apache.org/licenses/LICENSE-2.0.
 # 
 # SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
 # 
 # Contributors:
 #     Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation
 #=============================================================================*/

package org.eclipse.statet.ltk.ui.sourceediting.actions;

import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.BlockTextSelection;
import org.eclipse.swt.custom.ST;

import org.eclipse.statet.ltk.ui.sourceediting.ISourceEditor;


public class SelectPreviousWordHandler extends SourceEditorTextHandler {
	
	
	public SelectPreviousWordHandler(final ISourceEditor editor) {
		super(editor);
	}
	
	
	@Override
	protected int getTextActionId() {
		return ST.SELECT_WORD_PREVIOUS;
	}
	
	@Override
	protected void exec(final ExecData data) throws BadLocationException {
		if (data.getWidget().getBlockSelection()) {
			final BlockTextSelection blockSelection= (BlockTextSelection) data.getViewer().getSelection();
			if ((blockSelection.getStartColumn() != data.getCaretColumn()
					&& blockSelection.getEndColumn() != data.getCaretColumn())
					|| (data.getCaretDocOffset() == data.getCaretDocLineStartOffset()) ) {
				super.exec(data);
				return;
			}
			
			final int newDocOffset= findPreviousWordOffset(data, data.getCaretDocOffset(), true);
			final int newWidgetOffset= data.toWidgetOffset(newDocOffset);
			expandBlockSelection(data, newWidgetOffset);
		}
		else {
			final int newDocOffset= findPreviousWordOffset(data, data.getCaretDocOffset(), false);
			if (data.toWidgetOffset(newDocOffset) >= 0) {
				expandDocSelection(data, newDocOffset);
			}
			else {
				data.getWidget().invokeAction(ST.SELECT_COLUMN_PREVIOUS);
			}
		}
	}
	
}