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Java > Open Source Codes > org > eclipse > swt > events > FocusListener


1 /*******************************************************************************
2  * Copyright (c) 2000, 2003 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.swt.events;
12
13
14 import org.eclipse.swt.internal.SWTEventListener;
15
16 /**
17  * Classes which implement this interface provide methods
18  * that deal with the events that are generated as controls
19  * gain and lose focus.
20  * <p>
21  * After creating an instance of a class that implements
22  * this interface it can be added to a control using the
23  * <code>addFocusListener</code> method and removed using
24  * the <code>removeFocusListener</code> method. When a
25  * control gains or loses focus, the appropriate method
26  * will be invoked.
27  * </p>
28  *
29  * @see FocusAdapter
30  * @see FocusEvent
31  */
32 public interface FocusListener extends SWTEventListener {
33
34 /**
35  * Sent when a control gets focus.
36  *
37  * @param e an event containing information about the focus change
38  */
39 public void focusGained(FocusEvent e);
40
41 /**
42  * Sent when a control loses focus.
43  *
44  * @param e an event containing information about the focus change
45  */
46 public void focusLost(FocusEvent e);
47 }
48
49
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