| /******************************************************************************* |
| * Copyright (c) 2000, 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.draw2d; |
| |
| /** |
| * Classes which implement this interface provide methods to respond to changes |
| * in the ancestor properties of a Figure. |
| * <P> |
| * Instances of this class can be added as listeners to a figure using the |
| * <code>addAncestorListener</code> method and removed using the |
| * <code>removeAncestoreListener</code> method. When the parent chain of the |
| * figure being observed changes or moves, the listener will be notified |
| * appropriately. |
| */ |
| public interface AncestorListener { |
| |
| /** |
| * Called when an ancestor has been added into the listening figure's |
| * hierarchy. |
| * |
| * @param ancestor |
| * The ancestor that was added |
| */ |
| void ancestorAdded(IFigure ancestor); |
| |
| /** |
| * Called when an ancestor has moved to a new location. |
| * |
| * @param ancestor |
| * The ancestor that has moved |
| */ |
| void ancestorMoved(IFigure ancestor); |
| |
| /** |
| * Called when an ancestor has been removed from the listening figure's |
| * hierarchy. |
| * |
| * @param ancestor |
| * The ancestor that has been removed |
| */ |
| void ancestorRemoved(IFigure ancestor); |
| |
| /** |
| * An empty implementation of AncestorListener for convenience. |
| */ |
| class Stub implements AncestorListener { |
| public void ancestorMoved(IFigure ancestor) { |
| } |
| |
| public void ancestorAdded(IFigure ancestor) { |
| } |
| |
| public void ancestorRemoved(IFigure ancestor) { |
| } |
| } |
| |
| } |