| /******************************************************************************* |
| * Copyright (c) 2005, 2010 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.gef; |
| |
| import org.eclipse.swt.widgets.Event; |
| |
| import org.eclipse.gef.editparts.ZoomManager; |
| |
| /** |
| * A MouseWheelHandler that zooms the given viewer. Typically, this handler |
| * should be registered on a viewer that supports zoom as follows: <br> |
| * <code> |
| * graphicalViewer.setProperty(MouseWheelHandler.KeyGenerator.getKey(SWT.MOD1), |
| * MouseWheelZoomHandler.SINGLETON); |
| * </code> |
| * |
| * @author Pratik Shah |
| * @since 3.1 |
| */ |
| public final class MouseWheelZoomHandler implements MouseWheelHandler { |
| |
| /** |
| * The Singleton |
| */ |
| public static final MouseWheelHandler SINGLETON = new MouseWheelZoomHandler(); |
| |
| private MouseWheelZoomHandler() { |
| } |
| |
| /** |
| * Zooms the given viewer. |
| * |
| * @see MouseWheelHandler#handleMouseWheel(Event, EditPartViewer) |
| */ |
| public void handleMouseWheel(Event event, EditPartViewer viewer) { |
| ZoomManager zoomMgr = (ZoomManager) viewer |
| .getProperty(ZoomManager.class.toString()); |
| if (zoomMgr != null) { |
| if (event.count > 0) |
| zoomMgr.zoomIn(); |
| else |
| zoomMgr.zoomOut(); |
| event.doit = false; |
| } |
| } |
| |
| } |