JDialog resize question

[seema prakash]

Hi

I have a JDialog. I add components(label, buttons, checkbox, panel) to it. The panel holds
a scrollpane with a jtable. The table contents change depending on the checkbox selection.
The table shows 3 rows of data when the checkbox is not selected and 7 rows of data when the
check box is selected. I do not want the vertical scroll bars to be displayed instead would
like the dialog to change the size depending on the check box selection. Is this possible?
Any hints?

Thanks

[Darrin Cartwright]

Hi seema,

Yes, it's possible. First, if the JScrollpane is not used, remove it from the panel. When you add or remove components from the dialog, call pack() to resize the dialog. This will cause the LayoutManager to layout the components again, and resize the dialog if needed.
Here is a sample dialog I did in Netbeans: take a look at the AddRemoveCheckBoxItemStateChanged method.

import javax.swing.*;
import java.awt.*;
 
public class ResizableDialog extends javax.swing.JDialog
{
    public ResizableDialog(java.awt.Frame parent, boolean modal)
    {
        super(parent, modal);
        initComponents();
        setVisible(true);
    }
                         
    private void initComponents()
    {
        StuffPanel = new javax.swing.JPanel();
        AddRemoveCheckBox = new javax.swing.JCheckBox();
        ButtonPanel = new javax.swing.JPanel();
        CloseButton = new javax.swing.JButton();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
        AddRemoveCheckBox.setText("Add Stuff!");
        AddRemoveCheckBox.setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 0, 0, 0));
        AddRemoveCheckBox.setMargin(new java.awt.Insets(0, 0, 0, 0));
        AddRemoveCheckBox.addItemListener(new java.awt.event.ItemListener()
        {
            public void itemStateChanged(java.awt.event.ItemEvent evt)
            {
                AddRemoveCheckBoxItemStateChanged(evt);
            }
        });
 
        StuffPanel.add(AddRemoveCheckBox);
 
        getContentPane().add(StuffPanel, java.awt.BorderLayout.CENTER);
 
        ButtonPanel.setLayout(new java.awt.FlowLayout(java.awt.FlowLayout.RIGHT));
 
        CloseButton.setText("Close");
        CloseButton.addActionListener(new java.awt.event.ActionListener()
        {
            public void actionPerformed(java.awt.event.ActionEvent evt)
            {
                CloseButtonActionPerformed(evt);
            }
        });
 
        ButtonPanel.add(CloseButton);
 
        getContentPane().add(ButtonPanel, java.awt.BorderLayout.SOUTH);
 
        pack();
    }
 
    private void AddRemoveCheckBoxItemStateChanged(java.awt.event.ItemEvent evt)                                                   
    {                                                       
        // Add or remove some stuff!
        if( AddRemoveCheckBox.isSelected() )
        {
            // add stuff
            for( int i = 0; i < 10; i++ )
            {
                JLabel temp = new JLabel("New Stuff " + i);
                StuffPanel.add(temp);
            }
        }
        else
        {
            // remove the stuff
            Component[] oldStuff = StuffPanel.getComponents();
            for( Component c : oldStuff )
            {
                if( c instanceof JLabel )
                {
                    StuffPanel.remove(c);
                }
            }
        }
        
        // resize with the new stuff!
        pack();
    }                                                  
 
    private void CloseButtonActionPerformed(java.awt.event.ActionEvent evt)                                            
    {                                                
        this.setVisible(false);
    }                                           
                   
    javax.swing.JCheckBox AddRemoveCheckBox;
    javax.swing.JPanel ButtonPanel;
    javax.swing.JButton CloseButton;
    javax.swing.JPanel StuffPanel;                 
}

Notice that the LayoutManager determines how the dialog is resized.

Darrin
[ May 17, 2007: Message edited by: Darrin Cartwright ]