| /****************************************************************************** |
| * Copyright (c) 2007, 2008 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.gmf.runtime.diagram.ui.editpolicies; |
| |
| import java.util.Iterator; |
| |
| import org.eclipse.gef.EditPart; |
| import org.eclipse.gef.Request; |
| import org.eclipse.gef.commands.Command; |
| import org.eclipse.gef.commands.CompoundCommand; |
| import org.eclipse.gef.requests.ChangeBoundsRequest; |
| import org.eclipse.gmf.runtime.diagram.core.commands.UpdateGroupLocationCommand; |
| import org.eclipse.gmf.runtime.diagram.ui.commands.ICommandProxy; |
| import org.eclipse.gmf.runtime.diagram.ui.editparts.IGraphicalEditPart; |
| import org.eclipse.gmf.runtime.diagram.ui.requests.RequestConstants; |
| import org.eclipse.gmf.runtime.notation.View; |
| |
| /** |
| * A <code>XYLayoutEditPolicy</code> for a <code>GroupEditPart</code>. |
| * |
| * @author crevells |
| * @since 2.1 |
| */ |
| public class GroupXYLayoutEditPolicy |
| extends XYLayoutEditPolicy { |
| |
| public boolean understandsRequest(Request req) { |
| if (RequestConstants.REQ_AUTOSIZE.equals(req.getType())) { |
| return true; |
| } |
| return super.understandsRequest(req); |
| } |
| |
| public Command getCommand(Request request) { |
| if (RequestConstants.REQ_AUTOSIZE.equals(request.getType())) |
| return getCommandFromChildren(request); |
| return super.getCommand(request); |
| } |
| |
| /** |
| * Overridden so that if a child shape is moved or resized such that the |
| * group's location (i.e. top left corner) changes, the group's location as |
| * well as all the children's relative locations are updated. |
| */ |
| protected Command getResizeChildrenCommand(ChangeBoundsRequest request) { |
| CompoundCommand resize = new CompoundCommand(); |
| resize.add(super.getResizeChildrenCommand(request)); |
| resize.add(new ICommandProxy(new UpdateGroupLocationCommand( |
| ((IGraphicalEditPart) getHost()).getEditingDomain(), |
| (View) getHost().getModel()))); |
| return resize; |
| } |
| |
| public EditPart getTargetEditPart(Request request) { |
| if (REQ_CREATE.equals(request.getType())) { |
| return null; |
| } else if (RequestConstants.REQ_AUTOSIZE.equals(request.getType())) { |
| return getHost(); |
| } |
| return super.getTargetEditPart(request); |
| } |
| |
| /** |
| * Gets a command from each child in the group. |
| * |
| * @param request |
| * @return the compound command |
| */ |
| private Command getCommandFromChildren(Request request) { |
| CompoundCommand cc = new CompoundCommand(); |
| for (Iterator iter = getHost().getChildren().iterator(); iter.hasNext();) { |
| EditPart childEP = (EditPart) iter.next(); |
| cc.add(childEP.getCommand(request)); |
| } |
| cc.unwrap(); |
| return cc; |
| } |
| |
| } |