Swing-pre-1.0, jdk1.1.5, Solaris.

When using a JComboBox as a JTable cell editor, keyboard navigation doesn't work properly. Alt+Down arrow doesn't post menu of the JComboBox. 






Steps to reproduce:
1. Select the table (Note that on my system the table was
not visible until I actually clicked on it. This may be another bug.)
2. Use the arrow keys to select a cell in the first column
3. Type a letter

Note that the editor appears, but no changes can be made to the cell
If the combo box arrow is selected with the mouse, then changes can be
made with the keyboard.

import javax.swing.*;
import java.util.*;
import javax.swing.table.*;

public class JTableTest
{
	public static void main(String [] args)
	{
		//allow changing of look and feel from command line
		UIManager.LookAndFeelInfo[] lfi=UIManager.getInstalledLookAndFeels();
		try
		{
			if(args.length >0)
			{
				int i=new Integer(args[0]).intValue();
				if(i<lfi.length)
					UIManager.setLookAndFeel(lfi[i].getClassName());
			}
		}
		catch(Exception e)
		{
			//System.out.println(e);
		}
		//set up a frame
		JFrame jf=new JFrame();
		jf.setVisible(true);
		jf.setSize(640,480);
		Vector columnNames=new Vector(5,5);
		//set up some data
		for(int i=0;i<5;i++)
		{
			columnNames.addElement("Column "+i);
		}

		Vector data=new Vector(5,5);
		Vector d=new Vector(5,5);
		for(int i=0; i<5; i++)
		{
			Vector p=new Vector(5,5);
			p.addElement("A");
			for(int j=1; j<5; j++)
			{
				p.addElement("Cell "+i+", "+j);
			}
			data.addElement(p);
		}
		DefaultTableModel dt=new DefaultTableModel(data,columnNames);		
		//create a table
		JTable jt=new JTable(dt);
		jt.setSize(640,480);
		jt.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
		//create a cell editor
		Vector letters=new Vector(5,1);
		letters.addElement("A");
		letters.addElement("B");
		letters.addElement("C");
		letters.addElement("D");
		letters.addElement("E");
		JComboBox jb=new JComboBox(letters);
		jb.setLightWeightPopupEnabled(true);
		jb.setEnabled(true);
		jb.setEditable(true);
		DefaultCellEditor dce=new DefaultCellEditor(jb);
		//set the cell editor for the column
		TableColumn tc = jt.getColumn(jt.getColumnName(0));
		tc.setCellEditor(dce);
		
		jf.getContentPane().add(jt);
	}
}
(Review ID: 41128)
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  xxxxx@xxxxx   2003-09-09

Possible solutions:
Write custom cell editor
Process events manually
(Review ID: 41128)
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Custom cell editor developed as workaround is attached.
  xxxxx@xxxxx   2001-10-15

Yes, there is currently no equivalent of mousePressed which is availible from 
the keyboard. 
Contribution-Forum:https://jdk-collaboration.dev.java.net/servlets/ProjectForumMessageView?messageID=12159&forumID=1463
Posted Date : 2006-03-21 02:41:45.0

This problem still exists with Swing 1.1 final.
Keyboard events are not passed on to JComboBox
when positioned in a table (as CellEditor).
Also, navigation events (Arrow up, down, Enter) 
that are used by the table conflict with the
JComboBox.

Hi,

I want to try the Custom Cell cell editor for this problem. 
where can i find it.

Basically it's a problem with the focus transferal: 
editorComponent.requestFocus is simply the wrong method 
to call if the editor has a child that should receive the 
keyboard input.

For 1.4.1 I put some (hopefully working) example at:
http://www.mycgiserver.com/~Kleopatra/swing/table/focuscy
cle.html

Any feedback is highly welcome

Jeanette

Still not fixed in 1.4.2-b28. This has been open since 
Feb 05, 1998, and numerous "duplicates" filed in years 
after. What's the word? It's been almost 6 years now... 

Let's make this one 9 years old now.. This particular bug is stated sort of poorly, perhaps that's part of the problem. Bug 4528436 part B does a better job and has a good example.  Kleopatra had some good workarounds, but things changes in 1.6 and those workarounds don't work anymore. What's the word on this one? 

Found a workaround that seems to work under 1.6 here: 
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=5187832

You can override JTable's changeSelection method, ie:

public void changeSelection(int row, int column, boolean toggle, boolean extend)
{
	super.changeSelection(row, column, toggle, extend);
	if (column == yourComboBoxColumn)
		editCellAt(row, column);
}