Right Click in a TextArea problem

[eLL Pascual]

What seems to be the problem when you see this error message?

Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: parent not showing on screen

The error appears when I place the 'textArea.addActionListener(this);' right after 'textArea = new JTextArea(5,10);'

Just like this:

code:
----------------------------------------------------------------------------

textArea = new JTextArea(5,10);
textArea.addMouseListener(this);

----------------------------------------------------------------------------

when they are like this there is no error and no right click.

code:
----------------------------------------------------------------------------

textArea.addMouseListener(this);
textArea = new JTextArea(5,10);

----------------------------------------------------------------------------

I want my textArea to have a right click but it is not working.

Is there anything missing here?

code:
----------------------------------------------------------------------------

public void mousePressed(MouseEvent me)
{
System.out.print("Mouse Right-Clicked!");//Test if the mousePressed is working
if(me.getModifiers() != 0){
popup.show(this, me.getX(), me.getY());

}
}

public void mouseClicked(MouseEvent e){}
public void mouseReleased(MouseEvent e){}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}

----------------------------------------------------------------------------



To give you an overview of my code, this is it. My textArea is inside:

code:
----------------------------------------------------------------------------

public Container createContentPane(){

...
textArea = new JTextArea(5,10);
textArea.addMouseListener(this);
...
return contentPane;

}

----------------------------------------------------------------------------

which is called inside:


code:
----------------------------------------------------------------------------

public static void createShowGUI(){

...
notepad notpad = new notepad();//class instance
frame.setContentPane(notpad.createContentPane());

}

----------------------------------------------------------------------------

I already tried to put the 'textArea.addMouseListener(this);' inside the constructor but it is not
working.

Please help me. Thanks!

[pete stein]

First off, I advise you not to have your GUI class implement the MouseListener. It would be cleaner to just create an anonymous inner class. Next of all, you may have better luck getting decent responses if you show us compilable code. I don't want to see your whole program, but rather you should condense your code into the smallest bit that still compiles, has no extra code that's not relevant to your problem, but still demonstrates your problem, in other words, an SSCCE (Short, Self Contained, Correct (Compilable), Example). For more info on SSCCEs please look here:

http://homepage1.nifty.com/algafield/sscce.html

For example, here is an example of using an anonymous inner class for a MouseListener. I actually use a MouseAdapter so I don't have to have all of those empty mouse methods:

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
 
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
 
public class RightPressMouse
{
  private JPanel mainPanel = new JPanel();
  private JTextArea textArea = new JTextArea(10, 40);
 
  public RightPressMouse()
  {
    JScrollPane scrollpane = new JScrollPane(textArea);
    mainPanel.add(scrollpane);
    
    textArea.addMouseListener(new MouseAdapter()
    {
      public void mousePressed(MouseEvent e)
      {
        if (e.getButton() == MouseEvent.BUTTON3) // BUTTON3 is the right mouse button
        {
          System.out.println("right button pressed");
        }
      }
    });
  }
 
  public JPanel getMainPanel()
  {
    return mainPanel;
  }
 
  private static void createAndShowUI()
  {
    JFrame frame = new JFrame("RightPressMouse");
    frame.getContentPane().add(new RightPressMouse().getMainPanel());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }
 
  public static void main(String[] args)
  {
    java.awt.EventQueue.invokeLater(new Runnable()
    {
      public void run()
      {
        createAndShowUI();
      }
    });
  }
}

Last, don't forget to use code tags so that your code will retain its formatting and be readable.

Good luck!