show OptionDialog without JTabbedPane changing tab

[khuong pham]

I want to show an optionDialog when an user click on a tab in a JTabbedPane but the JTabbedPane must not show the clicked tab before the user selected the right option in the Dialog.

Thx in advance.

[Craig Wood]

import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
 
public class Interception implements ChangeListener
{
    int lastSelectedIndex = 0;
 
    public void stateChanged(ChangeEvent e)
    {
        JTabbedPane tabbedPane = (JTabbedPane)e.getSource();
        int selectedIndex = tabbedPane.getSelectedIndex();
        if(selectedIndex == 1)
        {
            Component component = tabbedPane.getComponentAt(selectedIndex);
            int result = JOptionPane.showConfirmDialog(tabbedPane, "ready?");
            if(result == JOptionPane.YES_OPTION)
                lastSelectedIndex = selectedIndex;
            else
                tabbedPane.setSelectedIndex(lastSelectedIndex);
        }
        else
            lastSelectedIndex = selectedIndex;
    }
 
    private JTabbedPane getContent()
    {
        JPanel p1 = new JPanel();
        p1.setBackground(Color.green);
        JPanel p2 = new JPanel();
        p2.setBackground(Color.yellow);
        JTabbedPane tabbedPane = new JTabbedPane();
        tabbedPane.addTab("one", p1);
        tabbedPane.addTab("two", p2);
        tabbedPane.addChangeListener(this);
        return tabbedPane;
    }
 
    public static void main(String[] args)
    {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(new Interception().getContent());
        f.setSize(200,200);
        f.setLocation(200,200);
        f.setVisible(true);
    }
}

[Ben Zung]

1. extend JOptionPane

   
public class MyOptionPane extends JOptionPane {
    public MyOptionPane(){
        new JDialog().setModal(true);
    }
}

2. have the component, say comp that contains the tabbed pane implements "ChangeListener"

3. in your "public void stateChanged(ChangeEvent e) "
method, instead of

  JOptionPane.showMessageDialog(this,"show me before going to the selected tab");  

use

 MyOptionPane.showMessageDialog(this,"show me before going to the selected tab");   

Gook luck.
[ March 30, 2006: Message edited by: Ben Zung ]

[khuong pham]

thx a lot ...The first example works great

[Paulo Guzman]

You can extends JTabbedPane to override the setSelectedIndex method and then call super.setSelectedIndex(index); after doing your validation something like:

public class ValidationTabbedPane extends JTabbedPane {
    private static final long serialVersionUID = 1L;

    public ValidationTabbedPane() {
        super();
      }

      @Override
      public void setSelectedIndex(int index) {
          if (index >= 0 && index < getTabCount()) {
              if(getSelectedIndex() == -1) {
                  super.setSelectedIndex(index);
              } else  {
                  Containers tab = tabs.get(getSelectedIndex());
                  boolean change = true;
                  if(tab.isDirty()) {
                      if(!MessageAlert.
                              yesNoMessage("You have unsaved changes. Do you want to change tab anyways? ", 
                                      mainTabbedPane)) {
                          change = false;
                      }
                  }
                  if(change) {
                      super.setSelectedIndex(index);
                  }
              }
          }           
      }
}