| /****************************************************************************** |
| * Copyright (c) 2002, 2003 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.gef.ui.internal.tools; |
| |
| import org.eclipse.gef.DragTracker; |
| import org.eclipse.gef.EditPart; |
| import org.eclipse.gef.EditPartViewer; |
| import org.eclipse.gef.tools.SelectEditPartTracker; |
| import org.eclipse.gef.tools.SelectionTool; |
| import org.eclipse.swt.events.MouseEvent; |
| |
| /** |
| * A drag tracker that allows a delegating editpart to be selected while |
| * another (delegate) editpart to be dragable. |
| * |
| * This class subclasses <code>SelectionTool</code> since it already implements |
| * the delegating pattern to a drag tracker. |
| * |
| * @author melaasar |
| */ |
| public class DelegatingDragEditPartsTracker |
| extends SelectionTool |
| implements DragTracker { |
| |
| /** |
| * The delegating editpart (the selectable) |
| */ |
| private EditPart delegatingEditPart; |
| /** |
| * The delegate editpart (the dragable) |
| */ |
| private EditPart delegateEditPart; |
| /** |
| * The initial mouse event upon dragging |
| */ |
| private MouseEvent initialME; |
| |
| /** |
| * Creates an instance of the delegating drag editparts tracker |
| * |
| * @param delegatingEditPart the <code>EditPart</code> that the selection gets delegated to |
| * @param delegateEditPart the <code>EditPart</code> that the drag gets delegated to. |
| */ |
| public DelegatingDragEditPartsTracker( |
| EditPart delegatingEditPart, |
| EditPart delegateEditPart) { |
| this.delegatingEditPart = delegatingEditPart; |
| this.delegateEditPart = delegateEditPart; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see org.eclipse.gef.tools.AbstractTool#handleButtonDown(int) |
| */ |
| protected boolean handleButtonDown(int button) { |
| setDragTracker(new SelectEditPartTracker(delegatingEditPart)); |
| lockTargetEditPart(delegatingEditPart); |
| return true; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see org.eclipse.gef.Tool#mouseDown(org.eclipse.swt.events.MouseEvent, org.eclipse.gef.EditPartViewer) |
| */ |
| public void mouseDown(MouseEvent e, EditPartViewer viewer) { |
| initialME = e; |
| super.mouseDown(e, viewer); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see org.eclipse.gef.tools.AbstractTool#handleDragStarted() |
| */ |
| protected boolean handleDragStarted() { |
| DragTracker tracker = delegateEditPart.getDragTracker(getTargetRequest()); |
| if (tracker != null){ |
| setDragTracker(tracker); |
| lockTargetEditPart(delegateEditPart); |
| tracker.mouseDown(initialME, getCurrentViewer()); |
| } |
| return super.handleDragStarted(); |
| } |
| |
| } |