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Java > Open Source Codes > org > eclipse > ui > ISelectionListener


1 /*******************************************************************************
2  * Copyright (c) 2000, 2005 IBM Corporation and others.
3  * All rights reserved. This program and the accompanying materials
4  * are made available under the terms of the Eclipse Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/epl-v10.html
7  *
8  * Contributors:
9  * IBM Corporation - initial API and implementation
10  *******************************************************************************/
11 package org.eclipse.ui;
12
13 import org.eclipse.jface.viewers.ISelection;
14
15 /**
16  * Interface for listening to selection changes.
17  * <p>
18  * This interface may be implemented by clients.
19  * </p>
20  *
21  * @see ISelectionService#addSelectionListener(ISelectionListener)
22  * @see ISelectionService#addSelectionListener(String, ISelectionListener)
23  * @see org.eclipse.ui.INullSelectionListener
24  */
25 public interface ISelectionListener {
26     /**
27      * Notifies this listener that the selection has changed.
28      * <p>
29      * This method is called when the selection changes from one to a
30      * <code>non-null</code> value, but not when the selection changes to
31      * <code>null</code>. If there is a requirement to be notified in the latter
32      * scenario, implement <code>INullSelectionListener</code>. The event will
33      * be posted through this method.
34      * </p>
35      *
36      * @param part the workbench part containing the selection
37      * @param selection the current selection. This may be <code>null</code>
38      * if <code>INullSelectionListener</code> is implemented.
39      */
40     public void selectionChanged(IWorkbenchPart part, ISelection selection);
41 }
42
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