Problem with ListCellRenderer

[Florin Constantinescu]

I have a JList which must have as elements instances of JPanel. On every panel I put a JCkeckBox(or a JButton). The list's renderer is something like this:

import java.awt.*;
import javax.swing.*;

class Renderer extends JPanel implements ListCellRenderer
{


// constructor

           public Renderer() 
	   {
		
              super();   
	   }

 // Configures the renderer based on the passed in components:
	   
	   public Component getListCellRendererComponent(JList list,
	           Object value,
	           int index,
	           boolean isSelected,
	           boolean cellHasFocus)
	   {
		   
	   
	      this.removeAll();
	      
	      this.add(new ListItem());
	 
	      this.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));
	           
	      return this;
	   }
}
   
 

, with ListItem:

import java.awt.*;
import javax.swing.*;

class ListItem extends JPanel
{
	

	private JCheckBox checkBox;

	
	public ListItem()
	{
		
		super();
		
                checkBox = new JCheckBox();

                this.setLayout(new BorderLayout());

                this.add(checkBox, BorderLayout.NORTH);
        }		
}
		

The problem is that the checkbox it is displayed but unfortunately it can't be checked! If I use a JButton instead, this can't be selected.
How can I solve this?

[Maneesh Godbole]

This will help
http://www.jroller.com/santhosh/entry/jlist_with_checkboxes

[Florin Constantinescu]

Maneesh Godbole wrote:This will help
http://www.jroller.com/santhosh/entry/jlist_with_checkboxes

Thank you, Maneesh.
But in this code, as in this one: http://www.coderanch.com/t/344173/Swing-AWT-SWT-JFace/java/Using-JCheckBox-as-CellRenderer-JList there is a big problem:

In the mouseClicked function it is used as the source of the event the list's cell, not the checkbox. So if you click the part of the cell which is situated outside the checkbox - the latter becomes selected, and this is not convenient for me. I render(in my application) a JPanel which has in one corner a little checkbox. I need the check box to be selected only when I click on it, not on another element which lies on the panel, let's say an image, etc.

I've tried to retain a Vector of checkboxes(the very ones which are rendered in the cells) and to add MouseListeners to each checkbox, but I can't "obtain" them in the handler, because they are subcomponents of the list. So this:

 

    public void mousePressed(MouseEvent e)
	 {
		 
		 System.out.println("It is the list: " + e.getSource().getClass().getName());
		 
		 if (e.getSource() instanceof JCheckBox)
		 {	 
			 
			 System.out.println("It is the check box!");
			 JCheckBox source = (JCheckBox)e.getSource();
			 
			 source.setSelected(!source.isSelected());
		 }
	 }

will print something like that(I've added also a MouseEvent to the list):

"It is the list: javax.swing.JList"

And instead of implementing in the following style(to identify the checkbox in the stack) JUST TO GET A SIMPLE CHECKBOX working properly: http://java.sun.com/docs/books/tutorial/uiswing/components/rootpane.html, I'd rather kill myself.

And finally, I can't use a JTable(which has both a default editor and a renderer) instead of a JList, because of Layout reasons(I use the JList because I need its HORIZONTAL_WRAP facility).

Is there a simple solution to get this done?