Positioning a JDialog

Hello, I have created a custom dialog box extending JDialog, but it doesn't display where the application frame area is, but at the upper left corner. How could I specify the position of the JDialog relative to the parent frame?

dialog.setLocation(x + parent.getLocation().x, y + parent.getLocation().y);
Or you could center the dialog relative to the parent using:
dialog.setLocationRelativeTo( parent );

Similar Messages

Set location of JOptionPane

How do I set the location of a JOptionpane relative to the parentComponent.
Everytime I code a JOptionpane the default location is always the center of the Container. How can I adjust or set the location of were the JOptionpane is shown in the Container?

There is a Swing forum for Swing related questions.
A JOptionPane is just a JDialog. When you use one of the showXXX methods a JDialog is created and a pack() is done and setLocationRelativeTo(...) is used to position the JDialog.
Take a look at the JOptionPane source code for the showOptionDialog(...) to see what all is involved in the above process. Then maybe you can create your own method that allows you to override the JDialogs default location.

Looking for DND bug, any help?

Hi,
I have developed a DND UI and I noticed along the way that to be able to drop from a Jtree on a jframe to a jtable on a nonmodal jdialog, I had to position the jdialog to the left of the jframe. I thought I discovered this as a bug at the time. Now I am trying to find it in the database.
Does this sound familiar to anyone who can help me?
Claire

Sounds to me more like a math error in your mouse handling code than any bug I am familar with - the fact that you have to position things along the 'X' axis correctly implies that you should look at that code for an error, or try it with another component.
Mitch

How to make a JDialog scrolling from one position to the other.

Hi all,
I want to move a JDialog from one position to the other(actually I want to scrolling/moving as messenger notification appear on top of the system tray) on the desktop.
Anyone of you can give me a clue.
Thanks

Ok here what I have try up to now. First make the initial position of the JFrame as follows.
    private void SetWindowLocation()
        final int screenHeight = Toolkit.getDefaultToolkit().getScreenSize().height;
        final int screenWidth = Toolkit.getDefaultToolkit().getScreenSize().width;
        final int frameHeight = this.getHeight();
        final int frameWidth = this.getWidth();
        int _y = (screenHeight - frameHeight - 32);
        int _x = (screenWidth - frameWidth);
// Initial location
        this.setLocation(_x, _y);
}This code place my Frame in the lower-right corner on top of the system-tray.
Then as you guys says, try to work on a Timer. Now I'm stuck with the action listener. I try to move the frame to upper-right corner.
    private void SetWindowLocation()
        final int screenHeight = Toolkit.getDefaultToolkit().getScreenSize().height;
        final int screenWidth = Toolkit.getDefaultToolkit().getScreenSize().width;
        final int frameHeight = this.getHeight();
        final int frameWidth = this.getWidth();
        int _y = (screenHeight - frameHeight - 32);
        int _x = (screenWidth - frameWidth);
// Initial location
        this.setLocation(_x, _y);
        _timer = new javax.swing.Timer(100, incrementYPosition);
ActionListener incrementYPosition = new ActionListener() {
        public void actionPerformed(ActionEvent evt) {
                   while(_y > 0){
                        // do the processing here.
                        // reduce the _y value and set the new location with _x
                };I'm stuck with that how to involve with the ActionListener here. :(:( After set the initial location how to deal with the ActionListener.
Any help.

JDialog position

Hello,
I wonder how the position of a JDialog is decided.
In the following code it is positioned below the parent frame. But when using the commented line with setLocationRelativeTo(DialogTest.this), the dialog is nicely placed in the parent's center.
Quite often I had also dialogs with the top left corner centered in the parent. Is there any rule as for what happens when?
Greetings
Jörg
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class DialogTest extends JFrame {
DialogTest dt;
public DialogTest() {
    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    setSize(300,300);
    setLocation(300,100);
    Container cp= getContentPane();
    JButton b= new JButton("Show dialog");
    b.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent evt) {
     JDialog dlg= new JDialog(DialogTest.this);
//     JDialog dlg= new JDialog(dt);
     dlg.setSize(200,100);
     dlg.setModal(true);
//     dlg.setLocationRelativeTo(DialogTest.this);
     dlg.setLocationRelativeTo(dt);
     dlg.setResizable(false);
     dlg.setTitle("The dialogue");
     dlg.setVisible(true);
    cp.add(b, BorderLayout.SOUTH);
    setVisible(true);
public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {
      public void run() {
     DialogTest dt= new DialogTest();
//     new DialogTest();
}

dlg.setLocationRelativeTo(dt);well dt is "null" so you are really saying
dlg.setLocationRelativeTo(null);which means center the dialog in the center of the screen.
Quite often I had also dialogs with the top left corner centered in the parentThe location of the dialog is determined at the time the method is invoked, not at the time the dialog is made visible. So this would happen if the size of the frame is (0, 0) when the method is invoked.
However, this may be in older versions of Java. It does not appear to happen in JDK6 on XP:
import javax.swing.*;
public class DialogTest5
public static void main(String args[])
     JFrame frame1 = new JFrame();
     frame1.setVisible(true);
     JDialog dialog1 = new JDialog(frame1, false);
     dialog1.setLocationRelativeTo(frame1);
//     frame1.setSize(200, 200); // has no effect on dialog location
     dialog1.setVisible(true);
     JFrame frame2 = new JFrame();
     frame2.setBounds(500, 500, 200, 200);
     frame2.setVisible(true);
     JDialog dialog2 = new JDialog(frame2, false);
//     dialog2.setSize(150, 100); // uncomment to see how this affects placement
     dialog2.setLocationRelativeTo(frame2);
     dialog2.setVisible(true);
}

IMAGE NOT DISPLAYED OVER JButton ON JDialog

Hi,
I am trying to display an image over a JButton inside a JDialog(pops up on button click from an applet). But it is invisible. But I am sure that it is drawn on the ContentPane since when i click partially/half at the position
of the JButton I could see the JButton with the image. Actualy I am resizing the JDialog since I have two buttons, one to minimise and the other two maximise the size of the JDailog.
All the buttons are in place but not visible neither at the first place nor when the JDialog is resized.
The code is as follows:
package com.dataworld.gis;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.print.*;
import javax.swing.*;
public class PrintThisPolygon extends JDialog {
     protected Image image;
     protected JButton print;
     protected JButton resize;
     protected JButton desize;
     private int pX=0, pY=0, pWidth=0, pHeight=0;
     public PrintThisPolygon(JFrame parent, Viewer viewer) {
          super(parent, "Print Polygon", true);
          this.setModal(false);
          getContentPane().setLayout(null);
          image = this.viewer.getScreenBuffer();
          pane = new Panel();
          print = new JButton("print", new ImageIcon("images/print.gif"));
          print.setBounds(0,5,50,20);
          print.setEnabled(true);
          print.addActionListener(new ActionListener(){
               public void actionPerformed(ActionEvent ae){
                    print();
          resize = new JButton("+", new ImageIcon("images/print.gif"));
          resize.setBounds(55,5,50, 20);
          resize.addActionListener(new ActionListener(){
               public void actionPerformed(ActionEvent ae){
                    resizePlus();
          desize = new JButton("-", new ImageIcon("images/print.gif"));
          desize.setBounds(105,5,50, 20);
          desize.addActionListener(new ActionListener(){
               public void actionPerformed(ActionEvent ae){
                    resizeMinus();
          getContentPane().add(print);
          getContentPane().add(resize);
          getContentPane().add(desize);
public String getAppletInfo() {
     return "Identify Polygon\n"
public void paint(Graphics g){
     System.out.println("Paint : pX " + pX + " pY :" + pY);
     g.drawImage(image, pX, pY, pWidth, pHeight, getBackground(), this);
protected void print() {
     ImagePrint sp = new ImagePrint(this.viewer);
public void resizeMinus(){
     repaint();
public void resizePlus(){
     repaint();
Can anybody has any clue. Can anybody help me out.
Thanx

I added resize code for those buttons and ended up with repaint problems too. When you manually resized the window everything was fine again. After a bit of digging around I found you need to call validate on the dialog and then things work.
IL,
There is the new scaling version of the code I modified above:package forum.com.dataworld.gis;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class PanelPaintFrame extends JFrame {
     public static void main(String[] args) {
          PanelPaintFrame frame = new PanelPaintFrame ();
          frame.setVisible (true);
     public PanelPaintFrame () {
          setBounds (100, 100, 600, 600);
          setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
          JButton showPrintDialogButton = new JButton ("Show Print Dialog...");
          JPanel buttonPanel = new JPanel ();
          buttonPanel.add (showPrintDialogButton);
          getContentPane ().add (buttonPanel);
          showPrintDialogButton.addActionListener (new ActionListener () {
               public void actionPerformed (ActionEvent e) {
                    PrintThisPolygon printDialog = new PrintThisPolygon (PanelPaintFrame.this);
                    printDialog.show();
          pack ();
     public class PrintThisPolygon extends JDialog {
          protected ImageIcon myOrigonalImage = null;
          protected Image image;
          protected JButton print;
          protected JButton resize;
          protected JButton desize;
          private int pX=0, pY=0, pWidth=0, pHeight=0;
          JPanel pane = null;
          public PrintThisPolygon(JFrame parent/*, Viewer viewer*/) {
               super(parent, "Print Polygon", true);
//               this.setModal(false);
               getContentPane().setLayout(null);
               // Substitute my own image
               myOrigonalImage = new ImageIcon (PrintThisPolygon.class.getResource ("images/MyCoolImage.jpg"));
               // Start off full size
               pWidth = myOrigonalImage.getIconWidth();
               pHeight = myOrigonalImage.getIconHeight();
               image = myOrigonalImage.getImage ().getScaledInstance(pWidth, pHeight, Image.SCALE_DEFAULT);
//               image = this.viewer.getScreenBuffer();
//               pane = new Panel();
               // Create a JPanel to draw the image
               pane = new JPanel(){
                    protected void paintComponent(Graphics g) {
                         System.out.println("Paint : pX " + pX + " pY :" + pY);
                         g.drawImage(image, pX, pY, pWidth, pHeight, getBackground(), this);
               pane.setBounds (0, 0, pWidth, pHeight);
               // Load the button image using a URL
               print = new JButton("print", new ImageIcon(PrintThisPolygon.class.getResource ("images/print.gif")));
//               print = new JButton("print", new ImageIcon("images/print.gif"));
               print.setBounds(0,5,55,20);
               print.setEnabled(true);
               print.addActionListener(new ActionListener(){
                    public void actionPerformed(ActionEvent ae){
                         print();
               resize = new JButton("+", new ImageIcon("images/print.gif"));
               resize.setBounds(55,5,50, 20);
               resize.addActionListener(new ActionListener(){
                    public void actionPerformed(ActionEvent ae){
                         resizePlus();
               desize = new JButton("-", new ImageIcon("images/print.gif"));
               desize.setBounds(105,5,50, 20);
               desize.addActionListener(new ActionListener(){
                    public void actionPerformed(ActionEvent ae){
                         resizeMinus();
               // Setup a transparent glass panel with no layout manager
               JPanel glassPanel = new JPanel ();
               glassPanel.setLayout (null);
               glassPanel.setOpaque (false);
               // Add the image panel to the dialog
               getContentPane().add(pane);
               // Add the buttons to the glass panel
               glassPanel.add(print);
               glassPanel.add(resize);
               glassPanel.add(desize);
               // Set our created panel as the glass panel and turn it on
               setGlassPane (glassPanel);
               glassPanel.setVisible (true);
               setBounds (100, 100, pWidth, pHeight);
//               setBounds (100, 100, 500, 300);
          public String getAppletInfo() {
               return "Identify Polygon\n";
//          public void paint(Graphics g){
//          protected void paintComponent(Graphics g) {
//               System.out.println("Paint : pX " + pX + " pY :" + pY);
//               g.drawImage(image, pX, pY, pWidth, pHeight, getBackground(), this);
          protected void print() {
               // Pretend to print
//               ImagePrint sp = new ImagePrint(this.viewer);
               System.out.println ("Print view...");
          public void resizeMinus(){
               // Scale the image down 10%
               int scaledWidth = pWidth - (int)(pWidth * 0.1);
               int scaledHeight = pHeight - (int)(pHeight * 0.1);
               scaleImage (scaledWidth, scaledHeight);
          public void resizePlus(){
               // Scale the image up 10%
               int scaledWidth = pWidth + (int)(pWidth * 0.1);
               int scaledHeight = pHeight + (int)(pHeight * 0.1);
               scaleImage (scaledWidth, scaledHeight);
          private void scaleImage (int scaledWidth, int scaledHeight) {
               // Create a new icon for drawing and retrieve its actuall size
               image = myOrigonalImage.getImage ().getScaledInstance (scaledWidth, scaledHeight, Image.SCALE_DEFAULT);
               pWidth = scaledWidth;
               pHeight = scaledHeight;
               // Resize
               setSize (pWidth, pHeight);
               pane.setSize (pWidth, pHeight);
               validate();
}

Positioning of objects

i have a JDialog and want to position the components so that they pass exactly . for example i have a JLabel but only part of it seen ,
should i give the size of any component maually
the other problem is that the user should be able to enter data in JTextfield but only figures , how can i forbid entering of figures
thanks in advance

Do you know how can i set the size of the objects
.setSize(new Dimension(x, y))and look at
.setMinimumSize()
.setMaximumSize()
how can i set the JDialog unresizable ?Look at http://java.sun.com/j2se/1.4.1/docs/api/java/awt/Dialog.html#setResizable(boolean)

Drag and drop an image over a JPanel (only change position on same JPanel)

Hi all,
there is JPanel added to a JDialog.
There is a BufferedImage on the JPanel: I need to let the image be dragged and dropped in another position over the same JPanel and read the new position's coordinates.
(Maybe the image has to be wrapped in a JComponent?)
Thanks in advance for any suggestions.
Ludovico

(Maybe the image has to be wrapped in a JComponent?)Just add the image to a JLabel and add the label to the panel.

JTree in JDialog .... addTreeSelectionListener doesn't work ????

Hi friends,
jTree1.addTreeSelectionListener(new javax.swing.event.TreeSelectionListener() {
public void valueChanged(javax.swing.event.TreeSelectionEvent evt) {
jTree1ValueChanged(evt);
i was trying to display the node position when user selects a node in the JTree.
but i'm able to do it in JFrame but i'm in need to do it in a JDialog. Please do help me.
public class Dialog extends JDialog implements TreeSelectionListener
jTree1 = new JTree(xTn);
jScrollPane1.setViewportView(jTree1);
private void jTree1ValueChanged(javax.swing.event.TreeSelectionEvent evt) {
System.out.println("1");
private void initComponents()
jScrollPane1 = new javax.swing.JScrollPane();
jTree1 = new javax.swing.JTree();
jLabel1 = new javax.swing.JLabel();
jTextField1 = new javax.swing.JTextField();
jButton1 = new javax.swing.JButton();
jTabbedPane1 = new javax.swing.JTabbedPane();
jPanel1 = new javax.swing.JPanel();
jScrollPane2 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
jPanel2 = new javax.swing.JPanel();
jScrollPane3 = new javax.swing.JScrollPane();
jEditorPane1 = new javax.swing.JEditorPane();
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
jTree1.addTreeSelectionListener(new javax.swing.event.TreeSelectionListener() {
public void valueChanged(javax.swing.event.TreeSelectionEvent evt) {
jTree1ValueChanged(evt);
}// </editor-fold>
public void valueChanged(TreeSelectionEvent e) {
System.out.println("2");
I want to print either "1" or "2"....
Thanks for the help :-)

Anandababu_Babu wrote:
Thanks for the feedback thompson , here is my SSCCE, hope this will help me in better result.You learn quickly. That bodes well. Try this code, note the comments.
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
public class Test_Dialog extends JDialog implements TreeSelectionListener
    public Test_Dialog(JFrame frame, boolean modal)
        super(frame, modal);
        jScrollPane1 = new javax.swing.JScrollPane();
        // effectively, the code is instatiating TWO JTrees
        //jTree1 = new javax.swing.JTree();
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        getContentPane().setLayout(new java.awt.FlowLayout());
        jScrollPane1.setAutoscrolls(true);
        getContentPane().add(jScrollPane1);
        pack();
        // here is no point calling this twice
        // pack();
        // if a GUI can be shown to break at 800x600, why make it so HUGE?
        //this.setBounds(0, 0, 1025, 735);
        setBounds(0, 0, 800, 600);
        this.setResizable(false);
        DefaultMutableTreeNode xTn = new DefaultMutableTreeNode("Sample");
        for(int i=0; i< 10;i++)
            xTn.add(new DefaultMutableTreeNode("Click "+i));
        jTree1 = new JTree(xTn);
        jScrollPane1.setViewportView(jTree1);
        // this will output "Method 1"
        jTree1.addTreeSelectionListener(this);
        // this will output "Method 2"
        jTree1.addTreeSelectionListener(new javax.swing.event.TreeSelectionListener() {
            public void valueChanged(javax.swing.event.TreeSelectionEvent evt) {
                jTree1ValueChanged(evt);
        jScrollPane1.setViewportView(jTree1);
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTree jTree1;
    private void jTree1ValueChanged(javax.swing.event.TreeSelectionEvent evt) {
        System.out.println("Method 1");
    public void valueChanged(TreeSelectionEvent e) {
       System.out.println("Method 2");
    public static void main(String aregsadf[])
        // these changes ensure the user is able to end the
        // JVM easily when running from the command line
        JFrame frame = new JFrame();
        frame.setSize(400,300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        // end 'easy end' changes
        new Test_Dialog(frame, true).setVisible(true);
}

Clicking mouse after closing JDialog sends event to last component (1.1.8)

There seems to be a bug in Java 1.1.8 that I'm looking for a workaround.
I have a JButton on a JFrame that brings up a modal JDialog when you click it. After closing the dialog, if you click on the JFrame without moving the mouse, it will click the button on the frame that was last clicked, even if the mouse is not over the button.
Steps to reproduce:
1. Use the mouse to click on the button on the frame to bring up the dialog.
2. Close the dialog with the mouse or keyboard and don't move the mouse at all. (Note that the mouse should be over the JFrame at this point, but not over the frame's button.)
3. Click the mouse again.
Result:
This causes the button on the frame to be clicked.
It seems as if the frame thinks that the mouse pointer is located where it was when the dialog came up.
Does anyone know how to prevent this from happening or a workaround?

We are using 1.1.8 because our product has to run on Mac OS 8.x - 9.x (and this is the latest JRE supported by these platforms).
When I say don't move the mouse, what I mean is when closing the dialog, if you don't move the mouse, it doesn't matter where the mouse pointer is, as long as it's over the frame. When you click it, the last button to get clicked will be clicked again. It's as if the frame thinks that the mouse hasn't moved since the dialog came up. This isn't a focus problem because if I set the focus on another control after opening the dialog (by calling requestFocus()), this problem still happens. I can also tab to another control after closing the dialog, but when clicking the mouse it still clicks the last button that was clicked. It's as if the frame needs to reset where the mouse position is when it becomes activated.

JDialog

Hello all,
I have JDialog window needs to on fixed position on screen. It should not be resized or moved to new location by user.
Help is needed.....
THanks

Uhm, read the API docs?
setResizable and setLocation
As far as always in the same place, setAlwaysOnTop will help some, and maybe a FocusListener that sets the location anew every time the window gets Focus? (Although I find this to be a very bogus requirement).
Once you've tried all those out, if it doesn't work the way you want, post your code and state your exact problem.

Popup a JDialog without it gaining focus. Can it be done?

Can it be done?
I have thought about having a JDialog already on screen but positioned off screen and move it onscreen when needed but seems a ugly idea. Any one got a nicer solution?

setFocusableWindowState(false) sort of works but the jDialog does gain focus then focus is given back to whatever window had focus before the JDialog was shown.

Changing Position of JScrollBar in a JScrollPane

Hi,
I am having a JList in a JScrollPane, and wanna to display JScrollBar on the left of JList (by default its at Right).Can I change the position of JScrollBar in a JScrollPane?
Pl. Help
Manoj

Use setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT)
IMHO, unless you are writing an application for Arabic/Hebrew, it's not a Good Idea (even if it's for the Lefties Guild Of America). And if it's for Arabic/Hebrew the whole display has to be swapped, and for this there is an applyComponentOrientation() method for JFrame/JDialog which acts on all components.

Jumping JDialog

Ive read some posts about this but neither of them really answer the question about why this is happening and how do i solve it, so i will throw it out to all of you geniuses for help.
The problem is that when I create the undecorated jdialog and try to drag it using my own mouse handler. When you drag it for long periods of time it starts to flicker and jump all over the screen. Here's the code, try it out and let me know if you figure anything out.
Compile and run, and then click the large button. A small bordered panel will appear somewhere near the middle of the screen. Grab an area with the mouse not far from the northern part of the new little panel. Start to drag it for a bit, all over the screen. After a short while, the box will begin to fly all over the place uncontrollably. Therein lies the problem.
Thanks in advance
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.image.BufferedImage;
import javatest.components.BlankFrame.BlankRootPane;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.border.LineBorder;
* @author atom
public class JumpingJDialog extends JDialog
    private static int xLocation = 400;
    private static int yLocation = 400;
     * Creates a new instance of JumpingJDialog
    public JumpingJDialog(JFrame parent)
        super(parent, "", false);
        setUndecorated(true);
        setFocusable(false);
        setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
        setAlwaysOnTop(true);
        setResizable(false);
        setLocation(xLocation, yLocation);
        setSize(300, 75);
        panel.setLayout(new BorderLayout());
        panel.setBorder(new LineBorder(Color.BLACK, 1));
        panel.add(new TitleBar(), BorderLayout.NORTH);
        add(panel);
    JPanel panel = new JPanel();
    private class TitleBar extends JPanel
        public TitleBar()
            setPreferredSize(new Dimension(getWidth(), 7));
            setOpaque(false);
            addMouseListener(ml);
            addMouseMotionListener(ml);
        TitleBarMouseListener ml = new TitleBarMouseListener();
        private class TitleBarMouseListener extends MouseAdapter implements MouseMotionListener
            double oldX, oldY;
             * Invoked when a mouse button is pressed on a component and then
             * dragged. <code>MOUSE_DRAGGED</code> events will continue to be
             * delivered to the component where the drag originated until the
             * mouse button is released (regardless of whether the mouse position
             * is within the bounds of the component).
             * <p>
             * Due to platform-dependent Drag&Drop implementations,
             * <code>MOUSE_DRAGGED</code> events may not be delivered during a native
             * Drag&Drop operation.
            public void mouseDragged(MouseEvent e)
                Point p = JumpingJDialog.this.getLocation();
                Point mp = e.getPoint();
                SwingUtilities.convertPointToScreen(mp, TitleBar.this);
                if (oldX < 0 || oldY < 0)
                    oldX = mp.x;
                    oldY = mp.y;
                else
                    if (mp.x >= 0 && mp.y >= 0)
                        Toolkit.getDefaultToolkit().sync();
                        double deltax = mp.x - oldX;
                        double deltay = mp.y - oldY;
                        oldX = mp.x + deltax;
                        oldY = mp.y + deltay;
                        Rectangle bounds = JumpingJDialog.this.getBounds();
                        if (bounds.contains(mp))
                            JumpingJDialog.this.setLocation((int)(mp.x-pressedX), (int)(mp.y-pressedY));
                        else
                            JumpingJDialog.this.setLocation((int)mp.x-pressedX, (int)mp.y-pressedY);
            public void mouseMoved(MouseEvent e)
            int pressedX, pressedY;
            public void mousePressed(MouseEvent e)
                pressedX = e.getX();
                pressedY = e.getY();
    public static void main(String[] args)
        SwingUtilities.invokeLater(new Runnable()
            public void run()
                final JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setSize(640, 480);
                frame.setVisible(true);
                frame.add(new JButton(new AbstractAction("New Dialog")
                    public void actionPerformed(ActionEvent e)
                        JumpingJDialog fd = new JumpingJDialog(frame);
                        fd.setVisible(true);
}

Here is the code for anyone who is interested
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.image.BufferedImage;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JWindow;
import javax.swing.SwingUtilities;
import javax.swing.border.LineBorder;
* @author atom
public class JumpingJDialog extends JWindow
    private static int xLocation = 400;
    private static int yLocation = 400;
     * Creates a new instance of JumpingJDialog
    public JumpingJDialog(JFrame parent)
        super(parent);
        setFocusable(false);
        setAlwaysOnTop(true);
        setLocation(xLocation, yLocation);
        setSize(300, 75);
        panel.setLayout(new BorderLayout());
        panel.setBorder(new LineBorder(Color.BLACK, 1));
        panel.add(new TitleBar(), BorderLayout.NORTH);
        add(panel);
    JPanel panel = new JPanel();
    private class TitleBar extends JPanel
        public TitleBar()
            setPreferredSize(new Dimension(getWidth(), 7));
            setOpaque(false);
            addMouseListener(ml);
            addMouseMotionListener(ml);
        TitleBarMouseListener ml = new TitleBarMouseListener();
        Point location;
        MouseEvent pressed;
        private class TitleBarMouseListener extends MouseAdapter implements MouseMotionListener
             * Invoked when a mouse button is pressed on a component and then
             * dragged. <code>MOUSE_DRAGGED</code> events will continue to be
             * delivered to the component where the drag originated until the
             * mouse button is released (regardless of whether the mouse position
             * is within the bounds of the component).
             * <p>
             * Due to platform-dependent Drag&Drop implementations,
             * <code>MOUSE_DRAGGED</code> events may not be delivered during a native
             * Drag&Drop operation.
            public void mousePressed(MouseEvent me)
                pressed = me;
            public void mouseDragged(MouseEvent me)
                location = JumpingJDialog.this.getLocation(location);
                int x = location.x - pressed.getX() + me.getX();
                int y = location.y - pressed.getY() + me.getY();
                JumpingJDialog.this.setLocation(x, y);
                Toolkit.getDefaultToolkit().sync();
            public void mouseMoved(MouseEvent e)
        public void mouseMoved(MouseEvent e)
        int pressedX, pressedY;
        public void mousePressed(MouseEvent e)
            pressedX = e.getX();
            pressedY = e.getY();
    public static void main(String[] args)
        SwingUtilities.invokeLater(new Runnable()
            public void run()
                final JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setSize(640, 480);
                frame.setVisible(true);
                frame.add(new JButton(new AbstractAction("New Dialog")
                    public void actionPerformed(ActionEvent e)
                        JumpingJDialog fd = new JumpingJDialog(frame);
                        fd.setVisible(true);
}

Smooth animated moving/resizing of JDialog

Greetings all,
I'm not sure if this belongs here or in the Java 2D subforum, but whatever. I'm working on a Swing desktop application whose main frame is laid out in a 3x3 GridLayout. Some of the panels in this grid have JLists with very long entries in them, and our users frequently complain that these panels are too small, so we'd like to implement the ability for them to "pop out" into bigger panels temporarily. We did this by simply removing the panel from the grid and dropping it in a JDialog of suitable size.
Now, it may seem pedantic, but I'm interested in making this as pretty as technologically possible. My approach thus far has been to make the JDialog undecorated and initially position it directly where the original panel was, then animate it growing by having a Timer call SetBounds with increasing parameters until the desired maximum size is reached. This looks pretty nice, but it's kind of jaggy and flickery. Is there a better way of doing this that takes advantage of Java's graphics capabilities?
Thanks!

We did this by simply removing the panel from the grid and dropping it in a JDialog of suitable size.It would probably be better to simply grab the model from the list and use it to create a new JList that you add to the dialog, that way you don't need to worry about replacing the list after the dialog is closed, because a component can only have a single parent.
then animate it growing by having a Timer call SetBounds with increasing parameters until the desired maximum size is reached. This looks pretty nice, but it's kind of jaggy and flickerySounds reasonable to me, I don't see why it would be jaggy and flickery.
If you need further help then you need to create a [Short, Self Contained, Compilable and Executable, Example Program (SSCCE)|http://homepage1.nifty.com/algafield/sscce.html], that demonstrates the incorrect behaviour.
Don't forget to use the Code Formatting Tags so the posted code retains its original formatting. That is done by selecting the code and then clicking on the "Code" button above the question input area.

Positioning a JDialog

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