KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > columba > core > gui > util > ThrobberIcon


1 //The contents of this file are subject to the Mozilla Public License Version 1.1
2 //(the "License"); you may not use this file except in compliance with the
3 //License. You may obtain a copy of the License at http://www.mozilla.org/MPL/
4 //
5 //Software distributed under the License is distributed on an "AS IS" basis,
6 //WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
7 //for the specific language governing rights and
8 //limitations under the License.
9 //
10 //The Original Code is "The Columba Project"
11 //
12 //The Initial Developers of the Original Code are Frederik Dietz and Timo Stich.
13 //Portions created by Frederik Dietz and Timo Stich are Copyright (C) 2003.
14 //
15 //All Rights Reserved.
16
17 package org.columba.core.gui.util;
18
19 import java.awt.BorderLayout JavaDoc;
20
21 import javax.swing.JPanel JavaDoc;
22
23 import org.columba.core.command.TaskManager;
24 import org.columba.core.command.TaskManagerEvent;
25 import org.columba.core.command.TaskManagerListener;
26 import org.columba.core.gui.base.AnimatedGIFComponent;
27 import org.columba.core.resourceloader.ImageLoader;
28
29 /**
30  * Animated image showing background activity.
31  * <p>
32  * Can be found in the menubar in the right topmost corner of Columba.
33  * <p>
34  * ImageSequenceTimer actually only listens for {@link TaskManagerEvent} and
35  * starts/stops as appropriate.
36  *
37  * @author fdietz
38  */
39 public class ThrobberIcon extends JPanel JavaDoc implements TaskManagerListener {
40
41     private TaskManager taskManager;
42
43     private AnimatedGIFComponent comp;
44
45     public ThrobberIcon() {
46         super();
47
48         setLayout(new BorderLayout JavaDoc());
49
50         comp = new AnimatedGIFComponent(ImageLoader
51                 .getMiscIcon("Throbber.gif").getImage(), ImageLoader
52                 .getMiscIcon("Throbber.png").getImage());
53         add(comp, BorderLayout.CENTER);
54
55         // register interested on changes in the running worker list
56 taskManager = TaskManager.getInstance();
57         taskManager.addTaskManagerListener(this);
58     }
59
60     /**
61      * Its an element of the toolbar, and therefor can't have the focus.
62      */
63     public boolean isFocusTraversable() {
64         return isRequestFocusEnabled();
65     }
66
67     public void start() {
68         comp.go();
69     }
70
71     public void stop() {
72         comp.stop();
73
74     }
75
76     public void workerAdded(TaskManagerEvent e) {
77         update();
78     }
79
80     public void workerRemoved(TaskManagerEvent e) {
81         update();
82     }
83
84     protected void update() {
85         // just the animation, if there are more than zero
86 // workers running
87 if (taskManager.count() > 0) {
88             start();
89         } else {
90             stop();
91         }
92     }
93 }
94
Popular Tags