Swing component fires an event to non-GUI code

Hi all -- this is my first post in forums.sun.com.
Question to get me started -
I have a Swing component that fires an ActionEvent. I would like that ActionEvent to trigger code that does not run on the AWT Event Queue thread (some code that will take some time without impacting GUI rendering performance.)
I know I could put that Event's action command into a synchronized Queue, and have a worker thread checking the queue and taking action when it finds a command there. Likewise, I could flag a volatile boolean as true, and have a worker thread check the flag and take action when true.
Or (and I suspect this is best), I could create a new SwingWorker thread right in actionPerformed().
Any opinions on what makes sense?

pkwooster: Yep. That's what I meant.
As for the design pattern, Observer was the pattern I was intending to use (and have already implemented). Would anyone argue that another method is more efficient or "correct"?
My sample project is:
Business Object -> Main Dialog -> Embedded Dialog
The Main Dialog contains no business logic - just simple navigation events. The Embedded Dialog contains the real controls and reports any interaction using Swing events, which the Main Dialog picks up.
I then set up the Observer pattern between the Main Dialog and the Business Object.

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How to fire an event with a non-AWT/Swing class?

Hi, Everybody,
I have an object that parse an XML file. When I meet an element with the value "true", I would like to fire an event, for instance a KeyEvent, just like a special key is pressed.
Could you provide me an example?
Thanks.
Youbin

use the firepropertychange methods as you do in beans.
iam giving an eg.
class abc
    MyListener lis;
    addMyListener(MyListener lis)
        this.lis = lis;
    abc()
        lis.fireEvent(new MyEvent("Class Instantiated"));
class MyEvent extends EventObject
    String e;
    MyEvent(Object src)
        super(src);
    MyEvent(String e)
        this.e = e;
interface MyListener
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}You can use this methedology.Any class implementing MyListener will the be notified of the event and your class abc can now generate events wherever it wants just like i fired an event during initialization.
you can also use observable/observer to achieve the same.

Event handling in custom Non-GUI components

I have a class which needs to fire events to outside. These events maybe captured by several objects in outside world. How can I achieve this? In so many places I read, they always refer to AWT and Swing whereas my objects don't have any dependency to GUI.
I simply need to fire an event from an object, and capture that event from other objects by registering event handlers.
I have experience in .Net programming with Events and Delegates (function pointers), but cannot find something like that in Java. All it offers is various kinds of GUI related Listeners where I can't find a proper help resource using them in Non-GUI components.

ravinsp wrote:
I have a class which needs to fire events to outside. These events maybe captured by several objects in outside world. How can I achieve this? In so many places I read, they always refer to AWT and Swing whereas my objects don't have any dependency to GUI.
I simply need to fire an event from an object, and capture that event from other objects by registering event handlers.
I have experience in .Net programming with Events and Delegates (function pointers), but cannot find something like that in Java. All it offers is various kinds of GUI related Listeners where I can't find a proper help resource using them in Non-GUI components.If you want to make your own Listener make your Listener. Create an event class that encapsulates the event as you want, create a listener interface that has a method like handleMyEvent(MyEvent me) and then add addMyEventListener, removeMyEventListener methods to your original class. Add a List<MyEvent> to your original class and add the listeners to it and then when events happen
MyEvent someEvent = new MyEvent();
for(MyEventListener mel : eventlisteners)
mel.handleMyEvent(someEvent);

Non-GUI events in Java

I was wondering how I would have to go about writing an event handling mechanism on something that is not GUI-based (non-AWT/SWING)!
Supposing one wanted to write an event listener that would tell them when a data structure is updated - e.g: in a typical producer-consumer model, where the consumer is to be notified of fresh entries whenever a producer writes integers to some data structure...
Does Java have classes/methods to handle such non-GUI-based 'events'? Is this a commonly found scenario in Java programming?
Thank you!

What you're looking for is the Observer-interface. Check out http://java.sun.com/j2se/1.4/docs/api/java/util/Observer.html
and
http://java.sun.com/j2se/1.4/docs/api/java/util/Observable.html

Can I catch system event without any gui component

Hi all!
I wanted to trap different event like key pressed or mouse clicked, but not on a particular awt or swing component. I want to listen a mouse event when mouse is clicked on desktop and not on any java frame. Can I
trap these events. If yes, how ?
Please help me if u know how to do this?
Thanks
Dhiraj Deshmukh

Normally its not possible to trap events which are not initiated by an awt/swing-component, BUT you can try to get it by using systemproperties or another but very difficult way is to put a glasspane on the complete desktop or put the desktop into a container. you can try, but i do really not know it works or not
Little hint: i think there exists a method getDesktopProperties()

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I'm making a GUI of which the main portion consists of a large text area. The text area would list problems that our company is experiencing - each row would represent a problem. Each row would give a problem ID and a description of the problem. I want to make it so that when the user clicks on a row (a problem), another dialog box would open which would present possible solutions to the user regarding the problem at hand. How would I write code to highlight a row which in turn would fire an event opening up another box?
I thought about going about this another way - have a drop down (jcombobox) integrated into each row which the user can choose from but I'm not sure if you can insert a drop down into a text area (and neatly into a row at that!) so I think the former way may be preferable.
Thanks in advance.
Regards,
Paul

If a java application is required (as opposed to a web-based solution using HTML's linking capabilities) the best approach might be a JList implementation. It could go something like this...
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
public class ListFrame extends JFrame
   public ListFrame()
      super("JList example frame");
      getContentPane().add(getListPanel(), BorderLayout.CENTER);
      setDefaultCloseOperation(EXIT_ON_CLOSE);
      pack();
      setVisible(true);
   private Component getListPanel()
      JPanel panel = new JPanel(new BorderLayout());
      final JList list = new JList(new Object[]
         "List option 1...",
         "List option 2...",
         "List option 3..."
      // This will make sure only one item can be checked at a time.
      list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
      // Handle the selection here.
      list.addListSelectionListener(new ListSelectionListener()
         public void valueChanged(ListSelectionEvent e)
            // No need to go on if this was a deselection.
            if (e.getValueIsAdjusting() || list.isSelectionEmpty())
               return;
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            Object selectedItem = list.getSelectedValue();
            JOptionPane.showMessageDialog(ListFrame.this, selectedItem);
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      // as you want). Standard JScrollPane functionalities can be used to control various
      // visual aspects of the list.
      JScrollPane scroll = new JScrollPane(list);
      scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
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      return panel;
   public static void main(String[] args)
      new ListFrame();
}I know this is quite after-the-fact, but I hope it helps (if you hadn't already solved the problem :) )

Support for Multilingual Numeral Input in JTextField swing component

When the User Locale is changed from the regional & language options in the control panel and the standard digits are customized to a non Latin character set, all the windows applications adhere to the changes made. HTML also respects the changes in effect and displays any numeric values using the new character set, which are the national digits for many Eastern Locales such as Chinese, Arabic(Saudi Arabia), Urdu and many more. The JTextField swing component given by java, however, does not show any support to the new settings. Any numeric input is displayed in the Latin character set even when the input locale of the system is also changed respectively. Any text input for this case is correctly displayed in the desired literals and appropriate glyphs. However, unlike the AWT components, numeral input and display is not catered as per the user/developer's requirements. This behavior was first noticed in 2007, as far as i have found out, and was reported once again on the same thread in 2010. The thread is given below as a reference. No action or response has been taken. Kindly look into this matter and please let me know if this bug has been reported before and if there is any intent of providing a fix for it.
Reference: http://www.coderanch.com/t/344075/GUI/java/Multilingual-support-JTextField
Regards,
Aitzaz Ahmad
Software Engineer
SENSYS

I too had an itch to reply with something like this
This is a sign of work well done!
The WD has so strong UI abstraction, that hides client-server nature applications almost completely. If you search forum, you will even find posts where developers try to upgrade value of ProgressMeter in <b>for</b> loop )
VS

Flicker with heavyweight swing component and setVisible(false) on Linux

Hi All,
I'm using Java 6 update 14 on Ubuntu Jaunty.
I'm developing a GUI for a system running linux. I'm using the Swing framework for the GUI but need to include 3D animation accelerated in hardware. I'm using the JOGL framework for applying the 3D animations which supplies one with two swing-like components, the GLJPanel and GLCanvas. These two components are lightweight and heavyweight swing components respectively.
The difficulty arises when adding the heavyweight GLCanvas component into the gui. Often I need to do a setVisible(false) on the component in which case the GLCanvas hides correctly, but shows a flicker before the background is displayed. On digging a little deeper I found that because the GLCanvas is heavyweight, on linux it calls down to the sun.awt.X11 classes to do the setVisible(false) on hide. The very deepest call, the xSetVisible(false) method of the XBaseWindow class, causes the component to be replaced by first a grey backgound, and then the correct background. This intermediate grey background is causing the flicker.
The source for the sun.awt.X11 packages was not available with the standard JDK 6 but I've found the open jdk source which matches the steps taken by the call. The xSetVisible method is as follows:
0667:            public void xSetVisible(boolean visible) {
0668:                if (log.isLoggable(Level.FINE))
0669:                    log.fine("Setting visible on " + this + " to " + visible);
0670:                XToolkit.awtLock();
0671:                try {
0672:                    this .visible = visible;
0673:                    if (visible) {
0674:                        XlibWrapper.XMapWindow(XToolkit.getDisplay(),
0675:                                getWindow());
0676:                    } else {
0677:                        XlibWrapper.XUnmapWindow(XToolkit.getDisplay(),
0678:                                getWindow());
0679:                    }
0680:                    XlibWrapper.XFlush(XToolkit.getDisplay());
0681:                } finally {
0682:                    XToolkit.awtUnlock();
0683:                }
0684:            }I've found that the XlibWrapper.XFlush(XToolkit.getDisplay()) line (680) causes the grey to appear and then the XToolkit.awtUnlock(); line repaints the correct background.
Using the lightwieght GLJPanel resolves this issue as it is a light weight component but unfortunately I'm unable to use it as the target system does not have the GLX 1.3 libraries required because of intel chipset driver issues (it has GLX 1.2). I cannot enable the opengl pipline either (-Dsun.java2d.opengl=True) for the same reason.
Is there a way to configure a heavyweight component to avoid the operation in line 680? As far as I can tell, the flicker would disappear and the display would still be correctly rendered had this line not been executed. This problem is not present in windows.
I've put together a minimal example of the problem. It requires the JOGL 1.1.1 libraries in the classpath. They can be found here: [JOGL-download|https://jogl.dev.java.net/servlets/ProjectDocumentList?folderID=11509&expandFolder=11509&folderID=11508]
I've also found that running the program with the -Dsun.awt.noerasebackground=true vm argument reduces the flicker to just one incorrect frame.
The program creates a swing app with a button to switch between the GLCanvas and a normal JPanel. When switching from the GLCanvas to the JPanel a grey flicker is noticeable on Linux. Step through the code in debug mode to the classes mentioned above to see the grey flicker frame manifest.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.media.opengl.GLCanvas;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JPanel;
import javax.swing.WindowConstants;
import javax.swing.border.EmptyBorder;
public class SwitchUsingJInternalFrameSwappedExample {
     private static JPanel glPanel;
     private static JPanel mainPanel;
     private static JPanel swingPanel1;
     private static boolean state;
     private static JInternalFrame layerFrame;
     private static GLCanvas glCanvas;
     public static void main(String[] args) {
          state = true;
          JFrame frame = new JFrame();
          frame.setSize(800, 800);
          frame.setContentPane(getMainPanel());
          frame.setVisible(true);
          frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
          frame.setBackground(Color.GREEN);
     // The main component.
     public static JPanel getMainPanel() {
          mainPanel = new JPanel();
          mainPanel.setBackground(new Color(0, 0, 255));
          mainPanel.setBorder(new EmptyBorder(new Insets(20, 20, 20, 20)));
          mainPanel.setLayout(new BorderLayout());
          mainPanel.add(getButton(), BorderLayout.NORTH);
          mainPanel.add(getAnimationPanel(), BorderLayout.CENTER);
          return mainPanel;
     // Switch button.
     private static JButton getButton() {
          JButton button = new JButton("Switch");
          button.addActionListener(new ActionListener() {
               @Override
               public void actionPerformed(ActionEvent e) {
                    switchToOpenGl();
          return button;
     // Do the switch.
     protected static void switchToOpenGl() {
          // Make the OpenGL overlay visible / invisible.
          if (!state) {
               glCanvas.setVisible(false);
          } else {
               glCanvas.setVisible(true);
          state = !state;
     // Normal swing panel with buttons
     public static JPanel getNormalPanel() {
          if (swingPanel1 == null) {
               swingPanel1 = new JPanel();
               for (int i = 0; i < 10; i++) {
                    swingPanel1.add(new JButton("Asdf" + i));
               swingPanel1.setBackground(Color.black);
          return swingPanel1;
     // Extra panel container just for testing whether background colors show through.
     public static JPanel getAnimationPanel() {
          if (glPanel == null) {
               glPanel = new JPanel(new BorderLayout());
               glPanel.setBorder(new EmptyBorder(new Insets(20, 20, 20, 20)));
               glPanel.setBackground(Color.YELLOW);
               glPanel.add(getLayerFrame(), BorderLayout.CENTER);
          return glPanel;
     // A component that has two layers (panes), one containing the swing components and one containing the OpenGl animation.
     private static JInternalFrame getLayerFrame() {
          if (layerFrame == null) {
               // Create a JInternalFrame that is not movable, iconifyable etc.
               layerFrame = new JInternalFrame(null, false, false, false, false);
               layerFrame.setBackground(new Color(155, 0, 0));
               layerFrame.setVisible(true);
               // Remove the title bar and border of the JInternalFrame.
               ((javax.swing.plaf.basic.BasicInternalFrameUI) layerFrame.getUI())
                         .setNorthPane(null);
               layerFrame.setBorder(null);
               // Add a normal swing component
               layerFrame.setContentPane(getNormalPanel());
               // Add the OpenGL animation overlay on a layer over the content layer.
               layerFrame.setGlassPane(getGLCanvas());
          return layerFrame;
     // OpenGL component.
     public static GLCanvas getGLCanvas() {
          if (glCanvas == null) {
               glCanvas = new GLCanvas();
               glCanvas.setBackground(Color.CYAN);
          return glCanvas;
}

Oracle employees typically don't read these forums, you can report bugs here: http://bugs.sun.com/bugdatabase/

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Hi All
How to fire an event dynamically in JSF Page?
Thanks
Sudhakar

Hi,
Thanks for the response. I mean to say, if I create the components dynamically then how can I fire events for those components.
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I'm having a little trouble finding info on how to write my own events, event listeners and then how to fire these events. Basically i want to listen on a socket for info and then fire an event. I want to have a JList listen for this event and update itself.
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Cheers.
-T

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In other worsd, when you invoke a spell checker in MS Word the spell check window is in focus when the word window is in focus.
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null

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I have added a JComboBox to my application, combined with an ActionListener which is added to the combobox just after initialization. It works fine, but there is one problem left:
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Best way to solve this problem? I thought about a adding a MouseListener, but that might be the longest way. There seems to be no special method in JComboBox class to set this desired property?
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thank you for your answer so far. Well, here is a trivial source code with the problem that still exists (see also my text at the end of this post). This one has been tested using Java 2 SDK V1.4, even using the newest SDK version did not change anything on the behaviour:
import javax.swing.*;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
* JComboBox-Test: using Java 2 SDK V1.4, ActionEvent is only fired by combobox, if
* a different item than the previous one is selected from combobox;
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        "item 1",
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        "item 3",
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What I need, is a routine that fires an event each time any item is selected!
I would be grateful for a helpful hint, how to solve this in a "clean" way :-)

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Please check this photo http://www.flickr.com/photos/39683118@N07/4483608081/
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        jLabel1.setText("jLabel1");
        jLabel2.setText("jLabel2");
        jLabel3.setText("jLabel3");
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                    .addComponent(jLabel2)
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                    .addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, 81, javax.swing.GroupLayout.PREFERRED_SIZE))
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            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(70, 70, 70)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
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                    .addComponent(jLabel2)
                    .addComponent(jCheckBox1))
                .addGap(18, 18, 18)
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    private javax.swing.JCheckBox jCheckBox1;
    private javax.swing.JComboBox jComboBox1;
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For more help create a [SSCCE (Short, Self Contained, Compilable and Executable, Example Program)|http://sscce.org], that demonstrates the incorrect behaviour.

Swing component fires an event to non-GUI code

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