Saturday, August 3, 2013

Java - JComboBox in a JTable cell

 
MainJFrame.java
 
/**
 * MainJFrame.java
 *
 * Created on Aug 2, 2013, 11:57:36 PM
 */

package me.dhanoop.forblog;

import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;

/**
 *
 * @author dhanoopbhaskar
 */
public class MainJFrame extends javax.swing.JFrame {

    /** Creates new form MainJFrame */
    public MainJFrame() {
        initComponents();
        customizeTable();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // 
    private void initComponents() {

        dbScrollPane = new javax.swing.JScrollPane();
        dbTable = new javax.swing.JTable();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        dbTable.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {

            },
            new String [] {
                "Title 1"
            }
        ));
        dbScrollPane.setViewportView(dbTable);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(dbScrollPane, javax.swing.GroupLayout.PREFERRED_SIZE, 169, javax.swing.GroupLayout.PREFERRED_SIZE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(dbScrollPane, javax.swing.GroupLayout.PREFERRED_SIZE, 81, javax.swing.GroupLayout.PREFERRED_SIZE)
        );

        pack();
    }// 

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MainJFrame().setVisible(true);
            }
        });
    }

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

    private void customizeTable() {
        Object[] columnNames = new Object[1];
        columnNames[0] = "ComboBox";
        Object[][] rowData = new Object[1][1];
        rowData[0][0] = "select gender";
        DefaultTableModel tableModel = new DBTableModel(rowData, columnNames);
        dbTable.setModel(tableModel);
        String[] gender = {"Male", "Female"};
        JComboBox tableData = new JComboBox(gender);
        dbTable.getColumnModel().getColumn(0).setCellEditor(new DefaultCellEditor(tableData));
        dbTable.updateUI();
    }

}

DBTableModel.java
 
package me.dhanoop.forblog;

import javax.swing.table.DefaultTableModel;

/**
 *
 * @author dhanoopbhaskar
 */
public class DBTableModel extends DefaultTableModel {

    public DBTableModel(Object[] columns) {
        super(columns, 0);
    }

    public DBTableModel(Object[][] data, Object[] columns) {
        super(data, columns);
    }

    @Override
    public boolean isCellEditable(int row, int column) {
        return true;
    }
}

The following is the key snippet in the program. What we do here is simply changing the CellEditor of the ColumnModel of the column at position 0 (zero) of the table.
 
    private void customizeTable() {
        Object[] columnNames = new Object[1];
        columnNames[0] = "ComboBox";
        Object[][] rowData = new Object[1][1];
        rowData[0][0] = "select gender";
        DefaultTableModel tableModel = new DBTableModel(rowData, columnNames);
        dbTable.setModel(tableModel);
        String[] gender = {"Male", "Female"};
        JComboBox tableData = new JComboBox(gender);
        dbTable.getColumnModel().getColumn(0).setCellEditor(new DefaultCellEditor(tableData));
        dbTable.updateUI();
    }

Here we use the following constructor of the class DefaultCellEditor.
 
public javax.swing.DefaultCellEditor(javax.swing.JComboBox);



In the next post we shall discuss on handling of various events in such combo boxes which are added to the table.

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