JTables editor/renderer ?

[seema prakash]

Hi,

I just created a sample program after reading the tutorials.
The second column has JTextField as an editor. It converts all the text into uppercase and renders it the same way.

But, I want to have the cell in the second column to change based on a condition. For this I have the ChangeUpperCaseEditor class. When I use this as editor it does not render correctly. What may be the problem? Please help.

The sample code is:

    
import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.text.*;
 
 
/**
 * This class creates a condition table
 *
 * @author
 *
 */
public class Sample extends JFrame
{
private JTable tblSelection;
private DefaultTableModel tblSelectionModel;
 
/**
 * Constructor
 */
public Sample()
{
//  Create the table with an empty row
 
String[] colNames = new String[] { "And/Or", "Conditions" };
tblSelectionModel = new DefaultTableModel(colNames, 2);
 
tblSelection = new JTable( tblSelectionModel )
{
public boolean isCellEditable(int row, int column)
{
// for the last row since it should be an empty row
// and first cell should also be empty
 
if (((column == 0) && (row == tblSelection.getRowCount() - 1))
|| ((column == 0 && row == 0))) {
return false;
} else {
return true;
}
}
};
getContentPane().add( new JScrollPane( tblSelection ) );
 
//  Use a combo box as the editor for the first column
 
String[] values = { "And", "Or" };
JComboBox editor = new JComboBox( values );
DefaultCellEditor dce = new DefaultCellEditor( editor );
tblSelection.getColumnModel().getColumn(0).setCellEditor(dce);

//use a textfield as the editor for the second column
JTextField textField = new JTextField();
textField.setDocument(new CWDocumentUpperCaseText());
DefaultCellEditor dce1 = new DefaultCellEditor( textField );
tblSelection.getColumnModel().getColumn(1).setCellEditor(dce1);

//ChangeUpperCaseEditor ucEditor = new ChangeUpperCaseEditor();
//tblSelection.getColumnModel().getColumn(1).setCellEditor(ucEditor);

//  Add a row to the table
 
JButton btnAdd = new JButton("Add");
btnAdd.addActionListener(new java.awt.event.ActionListener()
{
public void actionPerformed(ActionEvent e)
{
int rows = tblSelectionModel.getRowCount();
Object rowData[] = { "And", Integer.toString(rows - 1) };
tblSelectionModel.insertRow(rows - 1,  rowData);
}
});
getContentPane().add(btnAdd, BorderLayout.SOUTH);
}
 
 class CWDocumentUpperCaseText extends PlainDocument {
 
 public CWDocumentUpperCaseText() {
 }
 
 public void insertString(int ofst, String str, AttributeSet a) throws BadLocationException {
         if (str == null) return;
 
         if (!(isSizeValid(ofst))) {
             return;
         }
 
         char[] upper = str.toCharArray();
         StringBuffer sbuf = new StringBuffer(str.length());
 
         for (int i = 0; i < upper.length; i++) {
             if (isCharValid(upper[i], ofst + i)) {
                 sbuf.append(processChar(upper[i]));
             }
         }
 
         super.insertString(ofst, sbuf.toString(), a);
     }
 
 public boolean isSizeValid( int ofst){return true;}
 public char processChar( char ch){return  Character.toUpperCase(ch);}
 public boolean isCharValid( char ch, int ofst){return true;}// this class allows any characters after they get uppercased
}
 
 //Editor to change case depending on a condition
 class ChangeUpperCaseEditor extends AbstractCellEditor implements TableCellEditor {
 
    private JTextField textField = new JTextField();
 
    /**
 * Gets the tableCellEditorComponent attribute of the
 * ChangeUpperCaseEditor object
 */
        public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row,
                                                     int column) {        
 
                if((table.getRowCount()%2 == 0)){
                //Force to uppercase
                textField.setDocument( new CWDocumentUpperCaseText());
                }
                return   textField;
        }                                                                                                                                                                      
 
        /**
 * Gets the cellEditorValue attribute of the PasswordFieldEditor
 * object
 * 
 * @return The cellEditorValue value
 */
      public Object getCellEditorValue() {
           return textField;
      }
    }// end of ChangeUpperCaseEditor
 
static void createAndShowGUI() {
Sample frame = new Sample();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 200);
frame.setLocationRelativeTo( null );
frame.setVisible(true);
}
 
/**
 * @param args
 */
public static void main(String[] args) {
// TODO Auto-generated method stub
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
 

[Craig Wood]

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.text.*;
 
public class SampleRx extends JFrame {
    private JTable tblSelection;
    private DefaultTableModel tblSelectionModel;
 
    public SampleRx() {
        //  Create the table with an empty row
        String[] colNames = new String[] { "And/Or", "Conditions" };
        tblSelectionModel = new DefaultTableModel(colNames, 2);
 
        tblSelection = new JTable( tblSelectionModel ) {
            public boolean isCellEditable(int row, int column) {
                // for the last row since it should be an empty row
                // and first cell should also be empty
                if (((column == 0) && (row == tblSelection.getRowCount() - 1))
                           || ((column == 0 && row == 0))) {
                    return false;
                } else {
                    return true;
                }
            }
        };
        tblSelection.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);
        getContentPane().add( new JScrollPane( tblSelection ) );
 
        //  Use a combo box as the editor for the first column
        String[] values = { "And", "Or" };
        JComboBox editor = new JComboBox( values );
        DefaultCellEditor dce = new DefaultCellEditor( editor );
        tblSelection.getColumnModel().getColumn(0).setCellEditor(dce);

        //use a textfield as the editor for the second column
        //JTextField textField = new JTextField();
        //textField.setDocument(new CWDocumentUpperCaseText());
        //DefaultCellEditor dce1 = new DefaultCellEditor( textField );
        //tblSelection.getColumnModel().getColumn(1).setCellEditor(dce1);

        ChangeUpperCaseEditor ucEditor = new ChangeUpperCaseEditor();
        tblSelection.getColumnModel().getColumn(1).setCellEditor(ucEditor);

        //  Add a row to the table
        JButton btnAdd = new JButton("Add");
        btnAdd.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int rows = tblSelectionModel.getRowCount();
                Object rowData[] = { "And", Integer.toString(rows - 1) };
                tblSelectionModel.insertRow(rows - 1,  rowData);
            }
        });
        getContentPane().add(btnAdd, BorderLayout.SOUTH);
    }
 
class CWDocumentUpperCaseText extends PlainDocument {
    public CWDocumentUpperCaseText() { }
 
    public void insertString(int ofst, String str, AttributeSet a)
                                         throws BadLocationException {
        if (str == null) return;
 
        if (!(isSizeValid(ofst))) {
            return;
        }
 
        char[] upper = str.toCharArray();
        StringBuffer sbuf = new StringBuffer(str.length());
 
        for (int i = 0; i < upper.length; i++) {
            if (isCharValid(upper[i], ofst + i)) {
                sbuf.append(processChar(upper[i]));
            }
        }
 
        super.insertString(ofst, sbuf.toString(), a);
    }
 
    public boolean isSizeValid( int ofst){return true;}
    public char processChar( char ch){return  Character.toUpperCase(ch);}
    // this class allows any characters after they get uppercased
    public boolean isCharValid( char ch, int ofst){return true;}
}
 
/** Editor to change case depending on a condition */
class ChangeUpperCaseEditor extends AbstractCellEditor implements TableCellEditor {
    private JTextField plainField = new JTextField();
    private JTextField upperCaseField = new JTextField();
    private JTextField editor;
 
    public ChangeUpperCaseEditor() {
        upperCaseField.setDocument(new CWDocumentUpperCaseText());
    }
 
    public Component getTableCellEditorComponent(JTable table, Object value,
                                                 boolean isSelected, int row,
                                                 int column) {
        if((table.getRowCount()%2 == 0)) {
            editor = upperCaseField;
        } else {
            editor = plainField;
        }
        editor.setText((String)value);
        return editor;
    }
 
    public Object getCellEditorValue() {
        return editor.getText();
    }
}
 
    public static void main(String[] args) {
        SampleRx frame = new SampleRx();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 200);
        frame.setLocationRelativeTo( null );
        frame.setVisible(true);
    }
}

[seema prakash]

Thanks a lot for the help. It works fine.