ecommons.waltable/org.eclipse.statet.ecommons.waltable.core/src/org/eclipse/statet/ecommons/waltable/viewport/SelectRelativePageCommandHandler.java

/*=============================================================================#
 # Copyright (c) 2010, 2021 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.ecommons.waltable.viewport;

import org.eclipse.statet.ecommons.waltable.command.AbstractLayerCommandHandler;
import org.eclipse.statet.ecommons.waltable.layer.ILayer;
import org.eclipse.statet.ecommons.waltable.selection.SelectRelativeCellCommand;


public class SelectRelativePageCommandHandler extends AbstractLayerCommandHandler<SelectRelativePageCommand> {
	
	
	private final ILayer viewportLayer;
	
	
	public SelectRelativePageCommandHandler(final ILayer viewportLayer) {
		this.viewportLayer= viewportLayer;
	}
	
	
	@Override
	public Class<SelectRelativePageCommand> getCommandClass() {
		return SelectRelativePageCommand.class;
	}
	
	@Override
	protected boolean doCommand(final SelectRelativePageCommand command) {
		if (command.convertToTargetLayer(this.viewportLayer)) {
			long stepCount;
			switch (command.getDirection()) {
			case UP:
			case DOWN:
				stepCount= this.viewportLayer.getRowCount();
				break;
			case LEFT:
			case RIGHT:
				stepCount= this.viewportLayer.getColumnCount();
				break;
			default:
				return false;
			}
			this.viewportLayer.doCommand(new SelectRelativeCellCommand(
					command.getDirection(), stepCount, command.getSelectionFlags() ));
		}
		return true;
	}
	
}