enabling and disabling single cell in JTable

[Mahesh Kedari]

Hi all,
Is it possible to control enabling and disabling of table at cell level?

I have checked this post, but its partially helpful.

Requirement :
I have a table with 7 columns. If value of 2nd column in specific row is null then all other cells in that rows should be disabled.
But it should not disable other rows in which 2nd column contains valid data.

Could anyone please help me ?

[pete stein]

Mahesh Kedari wrote:Hi all,
Is it possible to control enabling and disabling of table at cell level?

I have checked this post, but its partially helpful.

How is it "partially" helpful as it has the key to your problem. Perhaps you should post a small compilable and runnable program that has no outside dependencies (no need for database or files), that illustrates your problem,and that shows how overriding the isCellEditable method doesn't work for you. This type of program is called an SSCCE. Please see this link for more instructions on how to create this: SSCCE link

[Mahesh Kedari]

Thanks pete for your reply.

Below is the runnable example of my code.

  
import java.awt.Component;
import java.util.Date;
import javax.swing.AbstractCellEditor;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import org.jdesktop.swingx.JXDatePicker;


public class MyFrame extends javax.swing.JFrame {

    public MyFrame() {
         try{
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        }catch (Exception e){
            e.printStackTrace();
        }
        initComponents(); 

        /* My problem is in below part of code.
         * Here Im adding new row to table with blank values.
         * But until and unless User fills up the date column in new Row, he
         * should not be able to edit anything in that row.
         */

        jTable1.getModel().addTableModelListener(new TableModelListener() {
            public void tableChanged(TableModelEvent e) {
                // If editing row is last row in table add one more row to table
                if(jTable1.getEditingRow()== (jTable1.getRowCount()-1)){
                    ((DefaultTableModel)jTable1.getModel()).addRow(new Object[]{});
                }
            }
        });
    }


    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jScrollPane1 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jTable1.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {"", null, null, null, null, null, null},
                {null, null, null, null, null, null, null},
                {null, null, null, null, null, null, null},
                {null, null, null, null, null, null, null}
            },
            new String [] {
                "Title 1", "Title 2", "Title 3", "Title 4", "Title 5", "Title 6", "Title 7"
            }
        ));
        jTable1.getColumnModel().getColumn(1).setCellEditor(new DateCellEditor());
        jTable1.getColumnModel().getColumn(1).setCellRenderer(new DateCellRenderer());
        jScrollPane1.setViewportView(jTable1);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 523, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(24, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(14, Short.MAX_VALUE)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 334, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MyFrame().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTable jTable1;
    // End of variables declaration

}

/* I am using DatePicker in 2nd row of the table.
 * Below are renderer and editor for that column
 */

class DateCellRenderer extends JXDatePicker implements TableCellRenderer {
    public Component getTableCellRendererComponent(JTable table, Object value,
            boolean isSelected, boolean hasFocus, int row, int column) {
        setFormats("yyyy-MM-dd");
        setDate((Date)value);
        return this;
    }
}

class DateCellEditor extends AbstractCellEditor implements TableCellEditor{
    protected JXDatePicker dateChooser;

    public DateCellEditor() {
        dateChooser = new JXDatePicker();
        dateChooser.setFormats("yyyy-MM-dd");
    }

    public Object getCellEditorValue() {
        Date selectedDate = dateChooser.getDate();
        return selectedDate;
    }

    public Component getTableCellEditorComponent(JTable table, Object value,
            boolean isSelected,int row, int column){
        dateChooser.setDate((Date) value);
        dateChooser.setFormats("yyyy-MM-dd");
        return dateChooser;
    }
}

I am adding new row to table if editing row is last row of the table. Here user must select the date first before editing anything else in that row. So i want to disable other cells in that row.

[Rob Spoor]

TableModel.isCellEditable takes both a row and column. That allows you to return a value dynamically based on the exact cell. Overriding DefaultTableModel is the easiest:

public boolean isCellEditable(int row, int column)
{
    if (column != 2 && getValueAt(row, 2) == null)
    {
        return false;
    }
    return super.isCellEditable(row, column); // or maybe simply "true"
}

[Mahesh Kedari]

Thanks alot Rob for help...!!
Its working fine.

[Rob Spoor]

You're welcome.