Using setValueAt to recreate mutually exclusive flags

Question

I have a JTable using a custom DefaultTableModel that has several boolean elements in the last column (displayed as checkmarks).

When I add a MouseListener to get the value of what was clicked, it seems that the checkmark switch no longer happens.

// As soon as this is used in the component // that is using the JTable, the toggling stops table.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent evt) { int col = table.getSelectedColumn(); int row = table.getSelectedRow(); Object o = table.getModel().getValueAt(row, col); 

I guess the event is consumed by the listener. What can I add to MouseListener code to restore the switching behavior?

Edit:

Unfortunately, the problem is my override:

 @Override public void setValueAt(Object aValue, int row, int column) { // Attempt at mutually exclusive checkboxes if( column == 2 ){ // Starts at 0. Seek an alternative solution to avoid hardcoding? // Algorithm: cycle through List to set other Booleans to false // Uses entities. Is there another way of getting the number of rows from model? List<MyEntity> myEntities = this.getDatas(); for( int i = 0; i < myEntities.size(); i++ ){ if( i != row ){ // Make sure this calls parent super.setValueAt( false , i, 2); } } } else { super.setValueAt(aValue, row, column); // Call parent class } } 

Answer 1

Do not add your own MouseListener . Instead, override setValueAt() in the TableModel to see the new value set by the default editor for Boolean.class .

Application: Here sscce . For convenience, it simply clears all entries in CHECK_COL , sets a new value, and sets the corresponding button.

 import java.awt.*; import javax.swing.*; import javax.swing.table.DefaultTableModel; /** * @see http://stackoverflow.com/questions/7920068 * @see http://stackoverflow.com/questions/4526779 */ public class CheckOne extends JPanel { private static final int CHECK_COL = 1; private static final Object[][] DATA = { {"One", Boolean.FALSE}, {"Two", Boolean.FALSE}, {"Three", Boolean.FALSE}, {"Four", Boolean.FALSE}, {"Five", Boolean.FALSE}, {"Six", Boolean.FALSE}, {"Seven", Boolean.FALSE}, {"Eight", Boolean.FALSE}, {"Nine", Boolean.FALSE}, {"Ten", Boolean.FALSE}}; private static final String[] COLUMNS = {"Number", "CheckBox"}; private DataModel dataModel = new DataModel(DATA, COLUMNS); private JTable table = new JTable(dataModel); private ControlPanel cp = new ControlPanel(); public CheckOne() { super(new BorderLayout()); this.add(new JScrollPane(table)); this.add(cp, BorderLayout.SOUTH); table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); table.setPreferredScrollableViewportSize(new Dimension(250, 175)); } private class DataModel extends DefaultTableModel { public DataModel(Object[][] data, Object[] columnNames) { super(data, columnNames); } @Override public void setValueAt(Object aValue, int row, int col) { if (col == CHECK_COL) { for (int r = 0; r < getRowCount(); r++) { super.setValueAt(false, r, CHECK_COL); } } super.setValueAt(aValue, row, col); cp.button.setEnabled(any()); } private boolean any() { boolean result = false; for (int r = 0; r < getRowCount(); r++) { Boolean b = (Boolean) getValueAt(r, CHECK_COL); result |= b; } return result; } @Override public Class<?> getColumnClass(int col) { if (col == CHECK_COL) { return getValueAt(0, CHECK_COL).getClass(); } return super.getColumnClass(col); } @Override public boolean isCellEditable(int row, int col) { return col == CHECK_COL; } } private class ControlPanel extends JPanel { JButton button = new JButton("Button"); public ControlPanel() { button.setEnabled(false); this.add(new JLabel("Selection:")); this.add(button); } } private static void createAndShowUI() { JFrame frame = new JFrame("CheckOne"); frame.add(new CheckOne()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } public static void main(String[] args) { java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { createAndShowUI(); } }); } }