JTable Columns

[francis varkey]

Respected Sirs,
How to insert different JComboBoxes ,in different rows in a same column ?

regards francis

[Craig Wood]

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
 
public class ComboColumn {
    private JScrollPane getContent() {
        int[][] values = {
            { 1, 19, 7 }, { 16, 4, 32, 12 }, { 6, 9, 4 }
        };
        // wrap values for editor comboBoxes
        Object[][] options = new Object[values.length][];
        for(int j = 0; j < values.length; j++) {
            options[j] = new Object[values[j].length];
            for(int k = 0; k < values[j].length; k++) {
                options[j][k] = Integer.valueOf(values[j][k]);
            }
        }
        // wrap all items for renderer comboBox
        int itemCount = 0;
        for(int j = 0; j < values.length; j++)
            for(int k = 0; k < values[j].length; k++)
                itemCount++;
        Object[] allItems = new Object[itemCount];
        for(int j = 0, count = 0; j < values.length; j++)
            for(int k = 0; k < values[j].length; k++)
                allItems[count++] = Integer.valueOf(values[j][k]);
 
        Object[][] rowData = {
            { "John", "12 ElmGrove",  options[0][0] },
            { "Sara", "97 BayShore",  options[1][0] },
            { "Kyle", "18 Stone Ave", options[2][0] }
        };
        Object[] colNames = { "name", "address", "options" };
        CustomModel model = new CustomModel(rowData, colNames);
        JTable table = new JTable(model);
        Dimension d = table.getPreferredSize();
        d.width = 360;
        table.setPreferredScrollableViewportSize(d);
        table.setCellSelectionEnabled(true);
        TableColumn col = table.getColumnModel().getColumn(2);
        col.setCellRenderer(new ComboRenderer(allItems));
        col.setCellEditor(new ComboEditor(options));
        return new JScrollPane(table);
    }
 
    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(new ComboColumn().getContent());
        f.pack();
        f.setLocation(200,200);
        f.setVisible(true);
    }
}
 
class CustomModel extends DefaultTableModel {
 
    CustomModel(Object[][] data, Object[] colNames) {
        super(data, colNames);
    }
 
    public void setSelection(Object value, int row) {
        setValueAt(value, row, 2);
        fireTableCellUpdated(row, 2);
    }
}
 
class ComboRenderer implements TableCellRenderer {
    JComboBox comboBox;
 
    ComboRenderer(Object[] items) {
        comboBox = new JComboBox(items);
        comboBox.setEditable(false);
    }
 
    public Component getTableCellRendererComponent(JTable table,
                                                   Object value,
                                                   boolean isSelected,
                                                   boolean hasFocus,
                                                   int row, int column) {
        if(isSelected) {
            comboBox.setForeground(table.getSelectionForeground());
            comboBox.setBackground(table.getSelectionBackground());
        } else {
            comboBox.setForeground(table.getForeground());
            comboBox.setBackground(table.getBackground());
        }
        comboBox.setSelectedItem(value);
        return comboBox;
    }
}
 
class ComboEditor extends DefaultCellEditor {
    JComboBox[] combos;
    JTable table;
 
    ComboEditor(Object[][] itemArrays) {
        super(new JComboBox());
        combos = new JComboBox[itemArrays.length];
        for(int j = 0; j < combos.length; j++) {
            combos[j] = new JComboBox(itemArrays[j]);
            combos[j].setEditable(false);
        }
    }
 
    public Component getTableCellEditorComponent(JTable table,
                                                 Object value,
                                                 boolean isSelected,
                                                 int row, int column) {
        if(this.table == null)
            this.table = table;
        JComboBox comboBox = combos[row];
        if(isSelected) {
            comboBox.setForeground(table.getSelectionForeground());
            comboBox.setBackground(table.getSelectionBackground());
        } else {
            comboBox.setForeground(table.getForeground());
            comboBox.setBackground(table.getBackground());
        }
        comboBox.setSelectedItem(value);
        return comboBox;
    }
 
    public boolean stopCellEditing() {
        int row = table.getEditingRow();
        Object value = combos[row].getSelectedItem();
        fireEditingStopped();
        ((CustomModel)table.getModel()).setSelection(value, row);
        return true;
    }
}