JLabel needs resizing in JDialog

I have a subclass of JDialog that shows messages to the user, kind of like JOptionPane, but with a bit more processing for my own purposes. I have a JLabel in the dialog that I set the message text on. The message is almost always HTML with some formatting, and frequently the text causes the size of the label to be higher than it was when laid out in NetBeans. If I just show the dialog that way, the label will adjust it's height but will push items below it (like my MMButtons) off the bottom of the dialog. The code calls pack() and validate() immediately before setVisible(true).
If I use a SwingWorker to schedule another pack() and validate() 500ms after showing the dialog, then that pack/validate cause the dialog to resize as it needs to.
Note: the text is set on the JLabel after the entire dialog has been created and layed out.
Question: how can I get the dialog to resize properly the first time it shows, so that there is not a delay before the full contents will show?
I'm using GroupLayout in my dialog. The layout code is shown below.
<pre>
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(pnlButtons, javax.swing.GroupLayout.DEFAULT_SIZE, 372, Short.MAX_VALUE)
.addComponent(lblMessage, javax.swing.GroupLayout.DEFAULT_SIZE, 372, Short.MAX_VALUE)
.addComponent(txtText, javax.swing.GroupLayout.DEFAULT_SIZE, 372, Short.MAX_VALUE))
.addContainerGap())
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(lblMessage, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(txtText, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(pnlButtons, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
</pre>

Why? Because the { code } tag was not documented in the help box on the right side, nor is there a button for it in the tool bar.
Anyway, here is the layout code again:
    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
      .addGroup(layout.createSequentialGroup()
        .addContainerGap()
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
          .addComponent(pnlButtons, javax.swing.GroupLayout.DEFAULT_SIZE, 372, Short.MAX_VALUE)
          .addComponent(lblMessage, javax.swing.GroupLayout.DEFAULT_SIZE, 372, Short.MAX_VALUE)
          .addComponent(txtText, javax.swing.GroupLayout.DEFAULT_SIZE, 372, Short.MAX_VALUE))
        .addContainerGap())
    layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
      .addGroup(layout.createSequentialGroup()
        .addContainerGap()
        .addComponent(lblMessage, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
        .addComponent(txtText, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
        .addComponent(pnlButtons, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
        .addContainerGap())
    );

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Problem resizing the JDialog???

hi,
I have a JDialog to which I am adding a JTable and JButton to search.
Based on search condition the table gets populated.
Problem here is
I give search condition 1 and puplate the table after that I resize the JDialog
Now i again serach it.Now the JDialog's size goes to the previous thing it does'nt take the resized size.
in the end of my seacrh action listner I am doing
this.pack();
this.setVisible(true);
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Any idea about this problem??
thnx
neel

The pack() method lays it out according to the preferred size of the content.
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Detecting Resizing of JDialog

Hey all,
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can anyone help..
Dynamic resizing in JDialog using setSize is not working properly on solaris, its work fine on windows.
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Hi,
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Cheers, Mathias

Image NOT displaying in JLabel in Jpanle in JDialog

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CODE:
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        g2.dispose();
        return resizedImg;
    }In order to resize the images.

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function MM_preloadImages() { //v3.0
var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
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function MM_findObj(n, d) { //v4.01
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
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if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
if(!x && d.getElementById) x=d.getElementById(n); return x;
function MM_swapImage() { //v3.0
var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
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LONG TERM SOLUTION: Don't use positioning in primary layouts. It doesn't work well, here's why: http://www.apptools.com/examples/pagelayout101.php
Learn to use CSS margins, padding and floats to align elements on screen.
http://alt-web.com/DEMOS/3-CSS-boxes.shtml
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Got to File | New > Blank page > HTML > Layouts.
Select a 2 or 3-col layout.
Hit Create button
Nancy O.

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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.

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It's not like Photoshop resizing at all - Flash is a vector
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www.offroadfire.com
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http://www.blurredistinction.com
Adobe Community Expert
http://www.adobe.com/communities/experts/

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package com.dataworld.gis;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.print.*;
import javax.swing.*;
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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();
}

Cannot display JLabel text in JTable

Hi, This is a simple but frustrating little problem
I am having trouble displaying the label text in a column of a JTable.
I have hacked up a copy of TableDialogEditDemo.java from the tutorials
on using JTables. This uses a renderer and editor models to deal with a
column of colors.
I have changed it to use JLabels instead. What want is for the label
text to appear and when the user selects the cell be allowed to launch
a dialog box (such as the demo program does with colorchooser).
The dialog launching funcionalty works fine but the label text does not display.
I end up with the column of JLabels as blank, even though the values
are properly set. It seems like the TableCellRenderer doesn't display the
controls text.
I've spent the better part of two work days trying to get this one to work.
Compiling and just running the code (without any interaction with the table)
shows the problem. The second column of items will be blank instead of
cells with text.
Help!
Thanks!
/Steve McCauley
Sanera Systems
[email protected]
Here is the code:
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.DefaultCellEditor;
import javax.swing.table.TableCellRenderer;
import javax.swing.JLabel;
import javax.swing.JDialog;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JColorChooser;
import javax.swing.BorderFactory;
import javax.swing.border.Border;
import javax.swing.JScrollPane;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import java.awt.*;
import java.awt.event.*;
* This is like TableEditDemo, except that it substitutes a
* Favorite Color column for the Last Name column and specifies
* a custom cell renderer and editor for the color data.
public class TableDialogEditDemo extends JFrame {
private boolean DEBUG = false;
public TableDialogEditDemo() {
super("TableDialogEditDemo");
MyTableModel myModel = new MyTableModel();
JTable table = new JTable(myModel);
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);
//Set up renderer and editor for the Favorite Color column.
setUpColorRenderer(table);
setUpColorEditor(table);
//Set up real input validation for integer data.
setUpIntegerEditor(table);
//Add the scroll pane to this window.
getContentPane().add(scrollPane, BorderLayout.CENTER);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
class ColorRenderer extends JLabel
implements TableCellRenderer {
Border unselectedBorder = null;
Border selectedBorder = null;
boolean isBordered = true;
public ColorRenderer(boolean isBordered) {
super();
this.isBordered = isBordered;
// setOpaque(true); //MUST do this for background to show up.
public Component getTableCellRendererComponent(
JTable table, Object color,
boolean isSelected, boolean hasFocus,
int row, int column) {
// setBackground((Color)color);
setForeground(Color.black);
setBackground(Color.white);
System.out.println(" Label: " + ((JLabel)color).getText());
if (isBordered) {
if (isSelected) {
if (selectedBorder == null) {
selectedBorder = BorderFactory.createMatteBorder(2,5,2,5,
table.getSelectionBackground());
setBorder(selectedBorder);
} else {
if (unselectedBorder == null) {
unselectedBorder = BorderFactory.createMatteBorder(2,5,2,5,
table.getBackground());
setBorder(unselectedBorder);
return this;
private void setUpColorRenderer(JTable table) {
table.setDefaultRenderer(JLabel.class,
new ColorRenderer(true));
//Set up the editor for the Color cells.
private void setUpColorEditor(JTable table) {
//First, set up the button that brings up the dialog.
final JButton button = new JButton("") {
public void setText(String s) {
//Button never shows text -- only color.
button.setBackground(Color.white);
button.setBorderPainted(false);
button.setMargin(new Insets(0,0,0,0));
//Now create an editor to encapsulate the button, and
//set it up as the editor for all Color cells.
final ColorEditor colorEditor = new ColorEditor(button);
table.setDefaultEditor(JLabel.class, colorEditor);
//Set up the dialog that the button brings up.
final JColorChooser colorChooser = new JColorChooser();
ActionListener okListener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
colorEditor.currentLabel = new JLabel("xxx");
final JDialog dialog = JColorChooser.createDialog(button,
"Pick a Color",
true,
colorChooser,
okListener,
null); //XXXDoublecheck this is OK
//Here's the code that brings up the dialog.
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
// button.setBackground(colorEditor.currentColor);
// colorChooser.setColor(colorEditor.currentColor);
//Without the following line, the dialog comes up
//in the middle of the screen.
//dialog.setLocationRelativeTo(button);
dialog.show();
* The editor button that brings up the dialog.
* We extend DefaultCellEditor for convenience,
* even though it mean we have to create a dummy
* check box. Another approach would be to copy
* the implementation of TableCellEditor methods
* from the source code for DefaultCellEditor.
class ColorEditor extends DefaultCellEditor {
JLabel currentLabel = null;
public ColorEditor(JButton b) {
super(new JCheckBox()); //Unfortunately, the constructor
//expects a check box, combo box,
//or text field.
editorComponent = b;
setClickCountToStart(1); //This is usually 1 or 2.
//Must do this so that editing stops when appropriate.
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
fireEditingStopped();
protected void fireEditingStopped() {
super.fireEditingStopped();
public Object getCellEditorValue() {
return currentLabel;
public Component getTableCellEditorComponent(JTable table,
Object value,
boolean isSelected,
int row,
int column) {
((JButton)editorComponent).setText(value.toString());
currentLabel = (JLabel)value;
return editorComponent;
private void setUpIntegerEditor(JTable table) {
//Set up the editor for the integer cells.
final WholeNumberField integerField = new WholeNumberField(0, 5);
integerField.setHorizontalAlignment(WholeNumberField.RIGHT);
DefaultCellEditor integerEditor =
new DefaultCellEditor(integerField) {
//Override DefaultCellEditor's getCellEditorValue method
//to return an Integer, not a String:
public Object getCellEditorValue() {
return new Integer(integerField.getValue());
table.setDefaultEditor(Integer.class, integerEditor);
class MyTableModel extends AbstractTableModel {
final String[] columnNames = {"First Name",
"Favorite Color",
"Sport",
"# of Years",
"Vegetarian"};
// final Object[][] data = {
// {"Mary", new Color(153, 0, 153),
// "Snowboarding", new Integer(5), new Boolean(false)},
// {"Alison", new Color(51, 51, 153),
// "Rowing", new Integer(3), new Boolean(true)},
// {"Kathy", new Color(51, 102, 51),
// "Chasing toddlers", new Integer(2), new Boolean(false)},
// {"Mark", Color.blue,
// "Speed reading", new Integer(20), new Boolean(true)},
// {"Philip", Color.pink,
// "Pool", new Integer(7), new Boolean(false)}
final Object[][] data = {
{"Mary", new JLabel("label-1"),
"Snowboarding", new Integer(5), new Boolean(false)},
{"Alison", new JLabel("label-2"),
"Rowing", new Integer(3), new Boolean(true)},
{"Kathy", new JLabel("label-3"),
"Chasing toddlers", new Integer(2), new Boolean(false)},
{"Mark", new JLabel("label-4"),
"Speed reading", new Integer(20), new Boolean(true)},
{"Philip", new JLabel("label-5"),
"Pool", new Integer(7), new Boolean(false)}
public int getColumnCount() {
return columnNames.length;
public int getRowCount() {
return data.length;
public String getColumnName(int col) {
return columnNames[col];
public Object getValueAt(int row, int col) {
return data[row][col];
* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
* Don't need to implement this method unless your table's
* editable.
public boolean isCellEditable(int row, int col) {
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
if (col < 1) {
return false;
} else {
return true;
public void setValueAt(Object value, int row, int col) {
if (DEBUG) {
System.out.println("Setting value at " + row + "," + col
+ " to " + value
+ " (an instance of "
+ value.getClass() + ")");
data[row][col] = value;
fireTableCellUpdated(row, col);
if (DEBUG) {
System.out.println("New value of data:");
printDebugData();
private void printDebugData() {
int numRows = getRowCount();
int numCols = getColumnCount();
for (int i=0; i < numRows; i++) {
System.out.print(" row " + i + ":");
for (int j=0; j < numCols; j++) {
System.out.print(" " + data[i][j]);
System.out.println();
System.out.println("--------------------------");
public static void main(String[] args) {
TableDialogEditDemo frame = new TableDialogEditDemo();
frame.pack();
frame.setVisible(true);

You pretty much hit the nail on the head. Thank!
Just didn't realize I needed to set the text of the component but with your
tip and thinking about it, it makes sense.
Actually I needed to use:
setText(t_label.getText());
Using toString got me: "java.swing......" (the components text representation)
Thanks a bunch!
/Steve

JLabel needs resizing in JDialog

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