| /*=============================================================================# |
| # 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.coordinate.Direction; |
| |
| |
| public class ScrollPageCommandHandler extends AbstractLayerCommandHandler<ScrollPageCommand> { |
| |
| |
| private final ViewportLayer viewportLayer; |
| |
| |
| public ScrollPageCommandHandler(final ViewportLayer viewportLayer) { |
| this.viewportLayer= viewportLayer; |
| } |
| |
| @Override |
| public Class<ScrollPageCommand> getCommandClass() { |
| return ScrollPageCommand.class; |
| } |
| |
| |
| @Override |
| protected boolean doCommand(final ScrollPageCommand command) { |
| final Direction direction= command.getDirection(); |
| final IViewportDim dim= this.viewportLayer.getDim(direction.getOrientation()); |
| if (direction.isBackward()) { |
| dim.scrollBackwardByPage(); |
| } |
| else /*if (direction.isForward())*/ { |
| dim.scrollForwardByPage(); |
| } |
| return true; |
| } |
| |
| } |