| /**************************************************************************** |
| * Copyright (c) 2004 Composent, Inc. 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: |
| * Composent, Inc. - initial API and implementation |
| *****************************************************************************/ |
| |
| package org.eclipse.ecf.presence.ui.dnd; |
| |
| import org.eclipse.ecf.presence.roster.IRosterItem; |
| import org.eclipse.swt.dnd.TransferData; |
| |
| /** |
| * Roster viewer drop target. This interface defines the |
| * required methods for implementers of the rosterViewerDropTarget |
| * extension point. |
| */ |
| public interface IRosterViewerDropTarget { |
| |
| /** |
| * Validates dropping on the given roster item. This method is called whenever some |
| * aspect of the drop operation changes. |
| * |
| * @param rosterItem the roster item that the mouse is currently hovering over, or |
| * <code>null</code> if the mouse is hovering over empty space |
| * @param operation the current drag operation (copy, move, etc.) |
| * @param transferData the current transfer type |
| * @return <code>true</code> if the drop is valid, and <code>false</code> |
| * otherwise |
| */ |
| public boolean validateDrop(IRosterItem rosterItem, int operation, TransferData transferData); |
| |
| /** |
| * Performs any work associated with the drop. |
| * |
| * @param data the drop data |
| * @return <code>true</code> if the drop was successful, and |
| * <code>false</code> otherwise |
| */ |
| |
| public boolean performDrop(Object data); |
| } |
