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Java > Open Source Codes > org > netbeans > modules > tasklist > core > util > ActivityListener


1 /*
2  * The contents of this file are subject to the terms of the Common Development
3  * and Distribution License (the License). You may not use this file except in
4  * compliance with the License.
5  *
6  * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
7  * or http://www.netbeans.org/cddl.txt.
8  *
9  * When distributing Covered Code, include this CDDL Header Notice in each file
10  * and include the License file at http://www.netbeans.org/cddl.txt.
11  * If applicable, add the following below the CDDL Header, with the fields
12  * enclosed by brackets [] replaced by your own identifying information:
13  * "Portions Copyrighted [year] [name of copyright owner]"
14  *
15  * The Original Software is NetBeans. The Initial Developer of the Original
16  * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
17  * Microsystems, Inc. All Rights Reserved.
18  */
19
20 package org.netbeans.modules.tasklist.core.util;
21
22 import java.awt.AWTEvent JavaDoc;
23 import java.awt.Toolkit JavaDoc;
24 import java.awt.event.AWTEventListener JavaDoc;
25
26 /**
27  * Listener for the user activity
28  */
29 public class ActivityListener implements AWTEventListener JavaDoc {
30     private static boolean initialized = false;
31     private static long lastActivity = System.currentTimeMillis();
32
33     /**
34      * Initializes the listener
35      */
36     public static void init() {
37         if (!initialized)
38             Toolkit.getDefaultToolkit().addAWTEventListener(
39                 new ActivityListener(),
40                 AWTEvent.KEY_EVENT_MASK | AWTEvent.MOUSE_EVENT_MASK |
41                 AWTEvent.MOUSE_MOTION_EVENT_MASK |
42                 AWTEvent.MOUSE_WHEEL_EVENT_MASK);
43     }
44
45     /**
46      * Returns the time of the last activity
47      *
48      * @see java.lang.System.currentTimeMillis
49      * @return time of the last activity
50      */
51     public static long getLastActivityMillis() {
52         return lastActivity;
53     }
54     
55     /**
56      * Creates a new instance of ActivityListener
57      */
58     private ActivityListener() {
59     }
60     
61     public void eventDispatched(AWTEvent JavaDoc event) {
62         lastActivity = System.currentTimeMillis();
63     }
64 }
65
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