| /******************************************************************************* |
| * 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.gef.editparts; |
| |
| import org.eclipse.draw2d.IFigure; |
| |
| import org.eclipse.gef.EditPart; |
| |
| /** |
| * Responsible for locating <i>layers</i> in a <code>GraphicalViewer</code>. |
| * Layers are just transparent {@link org.eclipse.draw2d.Figure figures}. |
| * <P> |
| * Typically, the <code>RootEditPart</code> will register() itself as the |
| * LayerManager for the GraphicalViewer. All other EditParts/EditPolicies |
| * looking for a layer use the Viewer's |
| * {@link org.eclipse.gef.EditPartViewer#getEditPartRegistry() editPartRegsitry} |
| * to find the <code>LayerManager</code>. |
| * |
| * @author hudsonr |
| * @since 2.0 |
| */ |
| public interface LayerManager { |
| |
| /** |
| * This key used to register the LayerManager in the Viewer's |
| * EditPartRegistry. |
| */ |
| Object ID = new Object(); |
| |
| /** |
| * Returns a specified layer. |
| * |
| * @param key |
| * a key identifying the layer |
| * @return the specified layer |
| */ |
| IFigure getLayer(Object key); |
| |
| /** |
| * A static helper |
| * |
| * @since 2.0 |
| */ |
| class Helper { |
| /** |
| * Finds the LayerManager given any EditPart in the Viewer. |
| * |
| * @param part |
| * any EditPart in a GraphicalViewer |
| * @return the <code>LayerManager</code> |
| */ |
| public static LayerManager find(EditPart part) { |
| return (LayerManager) part.getViewer().getEditPartRegistry() |
| .get(ID); |
| } |
| } |
| |
| } |